10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

__________________________________

FORM 10-Q

__________________________________

☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended September 30, 2021

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from                 to

Commission File Number: 001-38285 

BANDWIDTH INC.

(Exact name of registrant as specified in its charter)

__________________________________

 

Delaware	56-2242657
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

900 Main Campus Drive

Raleigh, NC 27606

(Address of principal executive offices) (Zip Code) 

(800) 808-5150

(Registrant’s telephone number, including area code)

__________________________________

Securities Registered Pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A Common Stock, par value $0.001 per share	BAND	NASDAQ Global Select Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes  x No ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).  Yes x  No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer	☒	Accelerated filer	☐
Non-accelerated filer	☐	Smaller reporting company	☐
		Emerging growth company	☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.    ☐ 

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).  Yes ☐  No ☒

As of October 29, 2021, 23,168,711 shares of the registrant’s Class A common stock and 1,965,170 shares of registrant’s Class B common stock were outstanding, respectively.

BANDWIDTH INC.

Table of Contents

		Page
Special Note Regarding Forward-Looking Statements		3
	PART I - FINANCIAL INFORMATION	5
Item 1.	Financial Statements	5
	Unaudited Condensed Consolidated Balance Sheets as of December 31, 2020 and September 30, 2021	5
	Unaudited Condensed Consolidated Statements of Operations for the Three and Nine Months Ended September 30, 2020 and 2021	6
	Unaudited Condensed Consolidated Statements of Comprehensive Loss for the Three and Nine Months Ended September 30, 2020 and 2021	7
	Unaudited Condensed Consolidated Statements of Changes in Stockholders’ Equity	8
	Unaudited Condensed Consolidated Statements of Cash Flows for the Nine Months Ended September 30, 2020 and 2021	10
	Notes to Unaudited Condensed Consolidated Financial Statements	12
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	37
Item 3.	Quantitative and Qualitative Disclosure About Market Risk	58
Item 4.	Controls and Procedures	59
	PART II - OTHER INFORMATION	60
Item 1.	Legal Proceedings	60
Item 1A.	Risk Factors	61
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	98
Item 6.	Exhibits	98
	Signatures	99

Special Note Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended (the “Securities Act”) and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). All statements contained in this Quarterly Report on Form 10-Q, other than statements of historical fact, are forward-looking statements. Forward-looking statements generally can be identified by the words “may,” “will,” “expect,” “believe,” “anticipate,” “intend,” “could,” “would,” “project,” “plan,” “estimate,” or “continue,” or the negative of these words or other similar terms or expressions that concern our expectations strategy, plans or intentions. Forward looking statements contained in this Quarterly Report on Form 10-Q include, but are not limited to, statements about:

•our ability to attract and retain customers, including large enterprises;

•our approach to identifying, attracting and keeping new and existing customers, as well as our expectations regarding customer turnover;

•our beliefs regarding network traffic growth and other trends related to the usage of our products and services;

•our ability to successfully defend our network, systems and data against ever-evolving cybersecurity threats, including denial-of-service and ransomware attacks;

•our expectations regarding revenue, costs, expenses, gross margin, dollar based net retention rate, adjusted EBITDA, non-generally accepted accounting principles in the United States of America (“GAAP”) net income and capital expenditures;

•our beliefs regarding the growth of our business and how that impacts our liquidity and capital resources requirements;

•the sufficiency of our cash and cash equivalents to meet our liquidity needs;

•our ability to attract, train, and retain qualified employees and key personnel;

•our beliefs regarding the expense and productivity of and competition for our sales force;

•our expectations regarding headcount;

•our ability to maintain and benefit from our corporate culture;

•our plans to further invest in and grow our business, including international offerings, and our ability to effectively manage our growth and associated investments;

•our ability to introduce new products and services and enhance existing products and services;

•our ability to successfully integrate and benefit from any strategic acquisitions, including our acquisition of Voxbone (as defined herein), or future strategic acquisitions or investments;

•our ability to effectively manage our international operations and expansion;

•our ability to compete successfully against current and future competitors;

•the evolution of technology affecting our products, services and markets;

•the impact of certain new accounting standards and guidance, as well as the time and cost of continued compliance with existing rules and standards;

•our beliefs regarding the use of Non-GAAP financial measures;

3

•our ability to comply with modified or new industry standards, laws and regulations applicable to our products, services and business, including the General Data Protection Regulation (“GDPR”), the California Consumer Privacy Act of 2018 and other privacy regulations that may be implemented in the future, and Secure Telephone Identity Revisited (“STIR”) and Signature-based Handling of Asserted Information Using toKENs (“SHAKEN”) (together, “STIR/SHAKEN”) and other robocalling prevention and anti-spam standards and increased costs associated with such compliance;

•our customers’ violation of our policies or other misuse of our platform;

•our ability to manage fees that have been or may be instituted by network providers that increase our costs;

•our ability to maintain, protect and enhance our intellectual property;

•our expectations regarding litigation and other pending or potential disputes;

•our ability to service the interest on our Convertible Notes (as defined herein) and repay such Convertible Notes, to the extent required;

•other risks related to our indebtedness; and

•our expectations about the impact of public health epidemics, such as COVID-19 (as defined herein), or natural disasters on the global economy and our business, results of operations and financial condition.

We caution you that the foregoing list may not contain all the forward-looking statements made in this Quarterly Report on Form 10-Q.

You should not rely upon forward-looking statements as predictions of future events. We have based the forward-looking statements contained in this Quarterly Report on Form 10-Q primarily on our current expectations and projections about future events and trends that we believe may affect our business, financial condition, results of operations and prospects. The outcome of the events described in these forward-looking statements is subject to risks, uncertainties and other factors described in the section titled “Risk Factors” and elsewhere in this Quarterly Report on Form 10-Q. Moreover, we operate in a very competitive and rapidly changing environment. New risks and uncertainties emerge from time to time and it is not possible for us to predict all risks and uncertainties that could have an impact on the forward-looking statements contained in this Quarterly Report on Form 10-Q. We cannot assure you that the results, events and circumstances reflected in the forward-looking statements will be achieved or occur, and actual results, events or circumstances could differ materially from those described in the forward-looking statements.

The forward-looking statements made in this Quarterly Report on Form 10-Q relate only to events as of the date on which the statements are made. We undertake no obligation to update any forward-looking statements made in this Quarterly Report on Form 10-Q to reflect events or circumstances after the date of this Quarterly Report on Form 10-Q or to reflect new information or the occurrence of unanticipated events, except as required by law. We may not actually achieve the plans, intentions or expectations disclosed in our forward-looking statements and you should not place undue reliance on our forward-looking statements. Our forward-looking statements do not reflect the potential impact of any future acquisitions, mergers, dispositions, joint ventures or investments we may make.

4

PART I - FINANCIAL INFORMATION

Item 1. Financial Statements

BANDWIDTH INC.

Condensed Consolidated Balance Sheets

(In thousands)

(Unaudited)

	As of December 31,		As of September 30,
	2020		2021
Assets
Current assets:
Cash and cash equivalents	$	72,163	$	321,819
Restricted cash	9,274		9,239
Other investments	40,000		—
Accounts receivable, net of allowance for doubtful accounts	55,243		75,161
Deferred costs	2,411		2,951
Prepaid expenses and other current assets	14,508		22,355
Total current assets	193,599		431,525
Property, plant and equipment, net	51,645		68,267
Operating right-of-use asset, net	19,491		15,612
Intangible assets, net	248,055		220,566
Deferred costs, non-current	3,604		4,262
Other long-term assets	1,975		7,543
Goodwill	372,239		353,151
Total assets	$	890,608	$	1,100,926
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable	$	11,665	$	15,688
Accrued expenses and other current liabilities	63,065		76,259
Current portion of deferred revenue	6,515		6,362
Advanced billings	5,429		4,797
Operating lease liability, current	5,515		6,015
Total current liabilities	92,189		109,121
Other liabilities	1,707		5,416
Operating lease liability, net of current portion	17,202		12,525
Deferred revenue, net of current portion	6,386		7,383
Deferred tax liability	61,005		57,997
Convertible senior notes	282,196		479,155
Total liabilities	460,685		671,597
Stockholders’ equity:
Class A and Class B common stock	24		25
Additional paid-in capital	451,463		499,738
Accumulated deficit	(49,505)		(68,693)
Accumulated other comprehensive income (loss)	27,941		(1,741)
Total stockholders’ equity	429,923		429,329
Total liabilities and stockholders’ equity	$	890,608	$	1,100,926

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

5

BANDWIDTH INC.

Condensed Consolidated Statements of Operations

(In thousands, except share and per share amounts)

(Unaudited)

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Revenue	$	84,758	$	130,638	$	230,066	$	364,775
Cost of revenue	45,527		72,395		123,895		199,782
Gross profit	39,231		58,243		106,171		164,993
Operating expenses:
Research and development	10,232		13,359		29,316		39,509
Sales and marketing	9,001		13,592		27,073		38,168
General and administrative	18,134		30,354		51,070		85,481
Total operating expenses	37,367		57,305		107,459		163,158
Operating income (loss)	1,864		938		(1,288)		1,835
Other expense, net	(4,206)		(7,567)		(8,980)		(20,768)
Loss before income taxes	(2,342)		(6,629)		(10,268)		(18,933)
Income tax provision	(10)		(315)		(13,783)		(255)
Net loss	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Net loss per share, basic and diluted	$	(0.10)	$	(0.28)	$	(1.01)	$	(0.77)
Weighted average number of common shares outstanding, basic and diluted	24,175,762		25,114,762		23,905,322		25,075,941

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

6

BANDWIDTH INC.

Condensed Consolidated Statements of Comprehensive Loss

(In thousands)

(Unaudited)

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Net loss	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Other comprehensive income (loss)
Foreign currency translation, net of income taxes	139		(12,512)		20		(29,682)
Other comprehensive income (loss)	139		(12,512)		20		(29,682)
Total comprehensive loss	$	(2,213)	$	(19,456)	$	(24,031)	$	(48,870)

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

7

BANDWIDTH INC.

Condensed Consolidated Statements of Changes in Stockholders’ Equity

(In thousands, except share amounts)

(Unaudited)

	Class A voting common stock			Class B voting common stock			Additional paid-in capital		Accumulated other comprehensive income (loss)		Accumulated deficit		Total stockholders’ equity
	Shares	Amount		Shares	Amount
Balance at December 31, 2019	18,584,478	$	19	4,927,401	$	5	$	275,553	$	41	$	(5,528)	$	270,090
Issuance of debt conversion option	—	—		—	—		104,553		—		—		104,553
Debt conversion option issuance costs, net of tax	—	—		—	—		(3,731)		—		—		(3,731)
Capped call option purchase price	—	—		—	—		(43,320)		—		—		(43,320)
Exercises of vested stock options	32,059	—		—	—		244		—		—		244
Vesting of restricted stock units	103,824	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(14,411)	—		—	—		(1,021)		—		—		(1,021)
Conversion of Class B voting common stock to Class A voting common stock	500,250	—		(500,250)	(1)		—		—		—		(1)
Foreign currency translation	—	—		—	—		—		(96)		—		(96)
Stock based compensation	—	—		—	—		2,499		—		—		2,499
Net loss	—	—		—	—		—		—		(1,058)		(1,058)
Balance at March 31, 2020	19,206,200	19		4,427,151	4		334,777		(55)		(6,586)		328,159
Debt conversion option issuance costs, net of tax	—	—		—	—		(11)		—		—		(11)
Exercises of vested stock options	502,182	1		—	—		3,296		—		—		3,297
Vesting of restricted stock units	21,871	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(2,133)	—		—	—		(272)		—		—		(272)
Conversion of Class B voting common stock to Class A voting common stock	827,597	—		(827,597)	—		—		—		—		—
Foreign currency translation	—	—		—	—		—		(23)		—		(23)
Stock based compensation	—	—		—	—		2,425		—		—		2,425
Net loss	—	—		—	—		—		—		(20,641)		(20,641)
Balance at June 30, 2020	20,555,717	20		3,599,554	4		340,215		(78)		(27,227)		312,934
Exercises of vested stock options	44,848	—		—	—		386		—		—		386
Vesting of restricted stock units	17,948	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(2,002)	—		—	—		(350)		—		—		(350)
Conversion of Class B voting common stock to Class A voting common stock	606,418	1		(606,418)	(1)		—		—		—		—
Foreign currency translation	—	—		—	—		—		139		—		139
Stock based compensation	—	—		—	—		2,382		—		—		2,382
Net loss	—	—		—	—		—		—		(2,352)		(2,352)
Balance at September 30, 2020	21,222,929	21		2,993,136	3		342,633		61		(29,579)		313,139
Exercises of vested stock options	13,995	—		—	—		149		—		—		149
Vesting of restricted stock units	17,424	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(1,749)	—		—	—		(273)		—		—		(273)
Conversion of Class B voting common stock to Class A voting common stock	497,011	—		(497,011)	(1)		—		—		—		(1)
Equity consideration for Voxbone acquisition	663,394	1		—	—		106,379		—		—		106,380
Foreign currency translation	—	—		—	—		—		27,880				27,880

8

BANDWIDTH INC.

Condensed Consolidated Statements of Changes in Stockholders’ Equity

(In thousands, except share amounts)

(Unaudited)

	Class A voting common stock			Class B voting common stock			Additional paid-in capital		Accumulated other comprehensive income (loss)		Accumulated deficit		Total stockholders’ equity
	Shares	Amount		Shares	Amount
Stock based compensation	—	—		—	—		2,575		—		—		2,575
Net loss	—	—		—	—		—		—		(19,926)		(19,926)
Balance at December 31, 2020	22,413,004	22		2,496,125	2		451,463		27,941		(49,505)		429,923
Issuance of debt conversion option	—	—		—	—		66,908		—		—		66,908
Debt conversion option issuance costs, net of tax	—	—		—	—		(2,049)		—		—		(2,049)
Capped call option purchase price	—	—		—	—		(25,500)		—		—		(25,500)
Exercises of vested stock options	57,817	—		—	—		753		—		—		753
Vesting of restricted stock units	141,707	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(19,879)	—		—	—		(3,187)		—		—		(3,187)
Conversion of Class B voting common stock to Class A voting common stock	280,955	1		(280,955)	—		—		—		—		1
Foreign currency translation	—	—		—	—		—		(23,185)		—		(23,185)
Stock based compensation	—	—		—	—		4,390		—		—		4,390
Net loss	—	—		—	—		—		—		(5,316)		(5,316)
Balance at March 31, 2021	22,873,604	23		2,215,170	2		492,778		4,756		(54,821)		442,738
Debt conversion option issuance costs, net of tax	—	—		—	—		30		—		—		30
Exercises of vested stock options	4,406	—		—	—		46		—		—		46
Vesting of restricted stock units	15,605	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(1,948)	—		—	—		(265)		—		—		(265)
Foreign currency translation	—	—		—	—		—		6,015		—		6,015
Stock based compensation	—	—		—	—		3,377		—		—		3,377
Net loss	—	—		—	—		—		—		(6,928)		(6,928)
Balance at June 30, 2021	22,891,667	23		2,215,170	2		495,966		10,771		(61,749)		445,013
Exercises of vested stock options	8,700	—		—	—		101		—		—		101
Vesting of restricted stock units	16,383	—		—	—		—		—		—		—
Equity awards withheld for tax liability	(1,631)	—		—	—		(154)		—		—		(154)
Conversion of Class B voting common stock to Class A voting common stock	250,000	—		(250,000)	—		—		—		—		—
Foreign currency translation	—	—		—	—		—		(12,512)		—		(12,512)
Stock based compensation	—	—		—	—		3,825		—		—		3,825
Net loss	—	—		—	—		—		—		(6,944)		(6,944)
Balance at September 30, 2021	23,165,119	$	23	1,965,170	$	2	$	499,738	$	(1,741)	$	(68,693)	$	429,329

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

9

BANDWIDTH INC.

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

	Nine months ended September 30,
	2020		2021
Cash flows from operating activities
Net loss	$	(24,051)	$	(19,188)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	9,927		27,478
Right-of-use asset amortization	3,522		4,251
Amortization of debt discount and issuance costs	10,916		19,475
Stock-based compensation	7,306		11,592
Deferred taxes	14,254		329
Loss on disposal of property and equipment	263		357
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	(16,218)		(20,610)
Prepaid expenses and other assets	(2,224)		(4,173)
Accounts payable	2,905		7,122
Accrued expenses and other liabilities	8,675		1,590
Operating right-of-use liability	(3,944)		(4,535)
Net cash provided by operating activities	11,331		23,688
Cash flows from investing activities
Purchase of property and equipment	(9,536)		(12,552)
Capitalized software development costs	(1,846)		(3,212)
Purchase of land	—		(30,017)
Proceeds from sale of land	—		17,462
Purchase of other investments	(230,780)		—
Proceeds from sales and maturities of other investments	—		40,000
Net cash (used in) provided by investing activities	(242,162)		11,681
Cash flows from financing activities
Payments on finance leases	—		(161)
Proceeds from issuance of convertible senior notes	400,000		250,000
Purchase of capped call	(43,320)		(25,500)
Payment of debt issuance costs	(11,965)		(7,544)
Proceeds from exercises of stock options	3,859		886
Value of equity awards withheld for tax liabilities	(1,472)		(3,720)
Net cash provided by financing activities	347,102		213,961
Effect of exchange rate changes on cash, cash equivalents and restricted cash	48		291
Net increase in cash, cash equivalents, and restricted cash	116,319		249,621
Cash, cash equivalents, and restricted cash, beginning of period	185,004		81,437
Cash, cash equivalents, and restricted cash, end of period	$	301,323	$	331,058
Supplemental disclosure of cash flow information
Cash paid for interest	$	556	$	674
Cash (refunded) paid for taxes, net	$	(152)	$	961
Supplemental disclosure of noncash investing and financing activities
Purchase of property and equipment, accrued but not paid	$	2,073	$	7,611
Obligation included in basis of acquired land	$	—	$	7,752
Lease incentive	$	—	$	3,193

10

BANDWIDTH INC.

Condensed Consolidated Statements of Cash Flows

(In thousands)

(Unaudited)

Obligation included in basis of land acquired by the Developer	$	—	$	4,512
Equity awards withheld for tax liabilities, accrued but not paid	$	348	$	132

The accompanying notes are an integral part of these unaudited condensed consolidated financial statements.

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BANDWIDTH INC.

Notes to Condensed Consolidated Financial Statements

(In thousands, except share and per share amounts)

(Unaudited)

1. Organization and Description of Business

Bandwidth Inc. (together with its subsidiaries, “Bandwidth” or the “Company”) was founded in July 2000 and incorporated in Delaware on March 29, 2001. The Company’s headquarters are located in Raleigh, North Carolina. The Company is an international cloud-based, software-powered communications platform-as-a-service (“CPaaS”) provider that enables enterprises to create, scale and operate voice or messaging communications services across any mobile application or connected device.

The Company has two operating and reportable segments, CPaaS and Other. CPaaS revenue is derived from usage and monthly services fees charged for usage of Voice, Messaging, 911 and Phone Numbers solutions through the Company’s proprietary CPaaS software application programming interfaces. Other revenue consists of fees charged for services provided such as: SIP trunking, data resale, and a hosted Voice-over Internet Protocol (“VoIP”). The Other segment also includes revenue from traffic generated by other carriers, SMS registration fees and other miscellaneous product lines.

On November 2, 2020, the Company acquired all of the A Ordinary Shares, B Ordinary Shares and C Ordinary Shares of Voice Topco Limited (“Voice Topco”) through a Share Purchase Agreement (the “Share Purchase Agreement” and such purchase, the “Share Purchase”). Voice Topco directly or indirectly held all of the issued and outstanding shares of Voxbone S.A., which (with its subsidiaries) was the operating subsidiary of Voice Topco (“Voxbone”). The transaction was valued at €446 million. As consideration for the Share Purchase, the Company (i) paid the selling stockholders approximately $400 million (or approximately €338 million based on prevailing exchange rates at the close of business on October 9, 2020) at the Closing and (ii) issued to the selling stockholders at the Closing shares of the Company’s Class A common stock, with an aggregate value of approximately €108 million (or approximately $128 million based on prevailing exchange rates at the close of business on October 9, 2020).

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 1, 2021.

The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by GAAP on an annual reporting basis.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2021 or any future period.

12

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Bandwidth Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and judgments that affect the amounts reported in these financial statements and accompanying notes. These estimates in the condensed consolidated financial statements include, but are not limited to, allowance for doubtful accounts, reserve for expected credit losses, reserve for sales credits, recoverability of long lived and intangible assets, fair value of acquired intangible assets and goodwill, discount rates used in the valuation of right-of-use assets and lease liabilities, the fair value of the liability and equity components of the Company’s Convertible Notes (as defined herein), estimated period of benefit, valuation allowances on deferred tax assets, certain accrued expenses and contingencies, economic and demographic actuarial assumptions related to pension and other postretirement benefit costs and liabilities, estimated cash flows on asset retirement obligation. Although the Company believes that the estimates it uses are reasonable, due to the inherent uncertainty involved in making these estimates, actual results reported in future periods could differ from those estimates.

Cash and Cash Equivalents

The Company classifies all highly liquid investments with original stated maturities of three months or less from the date of purchase as cash equivalents. All highly liquid investments with original stated maturities of greater than three months from the date of purchase are classified as current marketable securities, with the exception of time deposits with maturities greater than ninety days which are classified as other investments. Cash deposits are primarily in financial institutions in the United States. However, cash for monthly operating costs of international operations are deposited in banks outside the United States. The Company has a policy of making investments only with commercial institutions that have at least an investment grade credit rating. The Company utilizes money market funds as an investment option and only invests in AAA rated funds.

Restricted Cash

Restricted cash consists primarily of the holdback amount and its accrued interest remaining to be paid to the selling stockholders of Voxbone, employee withholding tax liability and employee benefits contributions not yet remitted. The Company has classified this asset as a short-term asset in order to match the expected period of restriction.

Accounts Receivable and Current Expected Credit Losses

Accounts receivable are stated at realizable value, net of allowances, which includes an allowance for doubtful accounts and a reserve for expected credit losses. The allowance for doubtful accounts is based on management’s assessment of the collectability of its customer accounts. The Company regularly reviews the composition of the accounts receivable aging, historical bad debts, changes in payment patterns, customer creditworthiness, current economic trends, and reasonable and supportable forecasts about the future. Relevant risk characteristics include customer size and historical loss patterns. Management has evaluated the expected credit losses related to trade accounts receivable and determined that allowances of approximately $1,203 and $1,467 for uncollectible accounts and customer balances that are disputed were required as of December 31, 2020 and September 30, 2021, respectively. Refer to Note 5, “Financial Statement Components” to these condensed consolidated financial statements, for a rollforward of the components of the allowances as of December 31, 2020 and September 30, 2021.

The Company includes unbilled receivables in its accounts receivable balance. Generally, these receivables represent earned revenue from services provided to customers, which will be billed in the next billing cycle. All

13

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

amounts are considered collectible and billable. As of December 31, 2020 and September 30, 2021, unbilled receivables were $27,692 and $32,665, respectively.

Concentration of Credit Risk

Financial instruments that are exposed to concentration of credit risk consist primarily of cash and cash equivalents, other investments and trade accounts receivable. Cash deposits may be in excess of insured limits. The Company believes that the financial institutions that hold its cash deposits are financially sound and, accordingly, minimal credit risk exists with respect to these balances.

With regard to customers, credit evaluation and account monitoring procedures are used to minimize the risk of loss. The Company believes that no additional credit risk beyond amounts provided for by the allowance for doubtful accounts are inherent in accounts receivable. As of December 31, 2020, one individual customer represented approximately 11% of the Company’s accounts receivable, net of allowance for doubtful accounts. As of September 30, 2021, one individual customer represented approximately 12% of the Company’s accounts receivable, net of allowance for doubtful accounts.

For the three and nine months ended September 30, 2020 and 2021, no individual customer represented more than 10% of the Company’s revenue.

Debt Issuance Costs

The Company incurs debt issuance costs associated with obtaining and entering into credit agreements, including the issuances of convertible notes. These costs customarily include non-refundable structuring fees, commitment fees, up-front fees and syndication expenses. The Company has a policy of deferring and amortizing these costs based on the effective interest method over the term of the credit agreements.

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The Company adopted this standard on January 1, 2021 on a prospective basis, which did not have a material impact on the Company’s financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt —Modifications and Extinguishments (Subtopic 470-50), Compensation--Stock Compensation (Topic 718), and Derivatives and Hedging--Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to provide clarity surrounding the treatment for a modification or an exchange of a freestanding equity-classified written call option. The amendments also provide guidance for the recognition and measurement of earnings-per-share (“EPS”) for certain modifications or exchanges of freestanding equity-classified written call options for entities that present EPS. The amendments do not affect a holder’s accounting for freestanding call options. ASU 2021-04 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company did not and does not expect to have any modification or exchanges of freestanding written call options classified in equity during the reporting period and therefore does not expect adoption will have a material impact on its financial statements.

14

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to address issues identified as a result of the complexity associated with applying GAAP for certain financial instruments with characteristics of liabilities and equity. For convertible instruments, ASU 2020-06 reduces the number of accounting models for convertible debt instruments and convertible preferred stock, and enhances information transparency by making targeted improvements to the disclosures for convertible instruments and EPS guidance on the basis of feedback from financial statement users. ASU 2020-06 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The Company will adopt the new guidance on January 1, 2022 using the modified retrospective approach resulting in adjustments in accumulated deficit and paid in capital. The Company will also record an increase in the convertible notes balance as a result of the reversal of the separation of the convertible debt between debt and equity. The adoption of this standard will decrease the amount of non-cash interest expense to be recognized in future periods as a result of eliminating the discount associated with the equity component. The number of diluted shares will increase as a result of transitioning from the treasury stock method to the as-if converted method for the calculation. The Company is currently quantifying the effect of adopting this new accounting guidance on its financial statements and earnings per share calculations.

3. Business Combination

During the three months ended September 30, 2021, the Company made measurement period adjustments to reflect facts and circumstances in existence as of October 31, 2020, the effective date of the Share Purchase (the “Effective Date”). The adjustments primarily related to certain state and local tax liabilities that were not reasonably estimable at the Effective Date and consisted of a $1,609 increase to goodwill and $1,609 increase to accrued expenses and other current liabilities.

The preliminary fair values of net assets acquired are substantially complete with the exception of certain working capital adjustments and goodwill. As the Company finalizes the fair value of assets acquired and liabilities assumed, additional purchase price adjustments may be recorded during the measurement period. The Company will reflect measurement period adjustments in the period in which the adjustments are recognized.

4. Fair Value Measurements

The carrying amounts of cash and cash equivalents, other investments, accounts receivable, accounts payable and accrued expenses approximate fair value as of December 31, 2020 and September 30, 2021 because of the relatively short duration of these instruments.

The Company evaluated its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level in which to classify them for each reporting period.

15

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The following table summarizes the assets measured at fair value as of December 31, 2020 and September 30, 2021:

	Fair value measurements on a recurring basis December 31, 2020
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	57,517	$	—	$	—	$	57,517
Other investments:
Time deposits	40,000		—		—		40,000
Total financial assets	$	97,517	$	—	$	—	$	97,517

    

	Fair value measurements on a recurring basis September 30, 2021
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	302,291	$	—	$	—	$	302,291
Total financial assets	$	302,291	$	—	$	—	$	302,291

As of September 30, 2021, the fair value of the 2026 and 2028 Convertible Notes, as further described in Note 9, “Debt”, was approximately $447,424 and $214,766, respectively. The fair value was determined based on the closing price for the Convertible Notes on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.

5. Financial Statement Components

Accounts receivable, net of allowances consist of the following:

	As of December 31,		As of September 30,
	2020		2021
Trade accounts receivable	$	26,504	$	42,987
Unbilled accounts receivable	27,692		32,665
Allowance for doubtful accounts and reserve for expected credit losses	(1,203)		(1,467)
Other accounts receivable	2,250		976
Total accounts receivable, net	$	55,243	$	75,161

Components of allowance for doubtful accounts and reserve for expected credit losses are as follows:

16

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Allowance for doubtful accounts:
Balance, beginning of period	$	(597)	$	(1,364)	$	(769)	$	(1,203)
Charged to bad debt expense	(312)		(169)		(492)		(475)
Deductions (1)	20		54		372		182
Impact of foreign currency translation	—		12		—		29
Balance, end of period	$	(889)	$	(1,467)	$	(889)	$	(1,467)

________________________

(1) Write off of uncollectible accounts after all collection efforts have been exhausted.

Accrued expenses and other current liabilities consisted of the following:

	As of December 31,		As of September 30,
	2020		2021
Accrued expense	$	31,549	$	39,444
Accrued compensation and benefits	19,534		17,341
Accrued sales, use, VAT and telecommunications related taxes	9,142		10,322
Current portion of finance lease	183		190
Obligation included in basis of acquired land	—		7,752
Other accrued expenses	2,657		1,210
Total accrued expenses and other current liabilities	$	63,065	$	76,259

6. Right-of-Use Asset and Lease Liabilities

Right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The Company determines if an arrangement is a lease at inception. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Operating lease expense attributable to lease payments is recognized on a straight-line basis over the lease term and is included in cost of sales and selling, general, and administrative expense on the Company’s condensed consolidated statements of operations. Finance leases result in the recognition of depreciation expense, which is recognized on a straight-line basis over the expected life of the leased asset, and interest expense, which is recognized following an effective interest rate method. Depreciation expense attributable to finance leases is included in cost of sales on the Company’s condensed consolidated statements of operations. The Company presents the operating leases in long-term assets and current and long-term liabilities in the accompanying condensed consolidated balance sheets. Finance leases are reported in property, plant and equipment, net, accrued expenses and other current liabilities, and other liabilities on the Company’s condensed consolidated balance sheets.

17

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The Company sub-leases approximately 17,073 square feet of office space to a related party, Relay, Inc. (f/k/a Republic Wireless, Inc.) (“Relay”). Future minimum sub-lease receipts required under the non-cancellable lease are as follows:

	As of September 30,
	2021
2021 (remaining)	$	115
2022	249
	$	364

As of September 30, 2021, the Company had various leased properties in the United States and internationally, with remaining lease terms of nine months to 5.25 years, some of which include options to extend the leases for up to 5 years. None of the options to extend the leases are recognized in operating lease ROU assets or lease liabilities. The Company has one lease with an early-termination option, which it does not expect to exercise. The Company has one lease not yet commenced, with a lease term of 20 years and two options to extend the lease by a term of ten years each, up to twenty additional years in total.

The components of lease expense recorded in general and administrative expenses in the condensed consolidated statement of operations were as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021			2020		2021
Operating lease cost	$	1,461	$	1,699		$	4,383	$	5,002
Finance lease cost:
Depreciation of assets	—		60			—		165
Interest on lease liabilities	—		5			—		14
Sublease income (1)	(96)		(96)			(288)		(288)
Total net lease cost	$	1,365	$	1,668		$	4,095	$	4,893

________________________

(1) See Note 16, “Related Parties” to these condensed consolidated financial statements, for additional details on sublease income.

During the three and nine months ended September 30, 2020, short-term operating lease expense was $0. During the three and nine months ended September 30, 2021, short-term operating lease expense was $372 and $1,098, respectively.

18

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Supplemental balance sheet information related to leases was as follows:

		As of December 31,		As of September 30,
Leases	Classification	2020		2021
Assets:
Operating lease assets	Operating right-of-use asset, net (1)	$	19,491	$	15,612
Finance lease assets	Property, plant and equipment, net (2)	464		408
Total leased assets		$	19,955	$	16,020
Liabilities:
Current
Operating	Operating lease liability, current	$	5,515	$	6,015
Finance	Accrued expenses and other current liabilities	183		190
Non-current
Operating	Operating lease liability, net of current portion	17,202		12,525
Finance	Other liabilities	282		224
Total lease liabilities		$	23,182	$	18,954

________________________

(1) Operating lease assets are recorded net of accumulated amortization of $9,083 and $13,298 as of December 31, 2020 and September 30, 2021, respectively.

(2) Finance lease assets are recorded net of accumulated depreciation of $28 and $187 as of December 31, 2020 and September 30, 2021, respectively.

Supplemental cash flow and other information related to leases was as follows:

	Nine months ended September 30,
	2020			2021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	3,944		$	4,535
Financing cash flows from finance leases	—			161
	$	3,944		$	4,696
Weighted average remaining lease term (in years)
Operating leases	3.65			3.14
Finance leases	—			2.56
Weighted average discount rate
Operating leases	4.99		%	4.77		%
Finance leases	—		%	4.00		%

19

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Maturities of lease liabilities were as follows:

	As of September 30, 2021
	Operating Leases		Finance Leases
2021 (remaining)	$	1,362	$	59
2022	6,991		182
2023	6,615		109
2024	2,665		74
2025	1,640		11
Thereafter	709		—
Total lease payments	19,982		435
Less: imputed interest	(1,442)		(21)
Total lease obligations	18,540		414
Less: current obligations	(6,015)		(190)
Long-term lease obligations	$	12,525	$	224

On June 4, 2021, the Company purchased approximately 40 acres of undeveloped land (the “Property”) in Raleigh, North Carolina, from the State of North Carolina (the “State”). The Company paid $30,017 for the land. Additionally, as consideration for the Property, the Company agreed to construct, at its expense, a parking lot and related improvements (the “Parking Improvements”) on land owned by the State adjacent to the Property. The estimated cost of construction of the Parking Improvements was $7,752. Subsequent to the purchase of the Property, the Company sold a portion of the Property constituting approximately 23.76 acres (the “Conveyed Parcel”) to USEF Edwards Mill Owner, LLC (the “Developer”) for $17,462. In addition, the Developer agreed to construct, at its expense, the Parking Improvements in connection with the Company’s purchase of the Property from the State. The Company retained approximately 17.06 acres of the Property, which was recorded at cost and is included in the Company’s condensed consolidated balance sheet as a component property, plant and equipment, net. The Company recorded a liability to construct the Parking Improvements, which is included as a component of accrued expenses and other current liabilities in the condensed consolidated balance sheet as of September 30, 2021. The Company recorded an asset for the Developer’s obligation to construct the Parking Improvements at the Developer's expense, which is included as a component of prepaid expenses and other current assets in the condensed consolidated balance sheet as of September 30, 2021. A lease incentive of $3,193 was recognized for the difference between the consideration received from the Developer for the Conveyed Parcel and the cost basis of the Conveyed Parcel and is included as a component of other liabilities on the condensed consolidated balance sheet. On October 1, 2021, the developer delivered the completed parking improvements and the State released the Company from its liability.

On May 27, 2021, the Company entered into a Lease Agreement (the “Lease”) with the Developer for the Conveyed Parcel, together with improvements for office and related infrastructure to be constructed thereon, collectively constituting approximately 534,000 gross square feet (the “Project”). The lease became effective upon closing of the sale of the Conveyed Parcel to the Developer. When construction of the Project is completed, the Company intends to relocate its corporate headquarters to the Project. The lease term will commence upon substantial completion of the final building to be delivered, as evidenced by a certificate of occupancy issued by the City of Raleigh (the “Commencement Date”), and continue for a period of twenty (20) years (the “Initial Term”). It is anticipated that the Commencement Date will occur in May 2023. The Company has the option to renew the Initial Term for two ten-year periods at a rental rate equal to 100% of the then-prevailing market rental rate for comparable buildings in the Raleigh, North Carolina, market. Upon the effective date, the Company deposited $2,500 with the Developer as security on the lease. The deposit is included in other long-term assets on the Company’s condensed consolidated balance sheet. Additionally, the Company placed $3,000 in escrow to fund the certain tenant improvements expected to be constructed as part of the development of the Project.

20

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

No right-of-use assets or lease liabilities have been recognized in connection with the lease as of September 30, 2021. Future lease payments are included in Note 13, “Commitments and Contingencies”.

7. Property, Plant and Equipment

Property, plant and equipment, net consisted of the following:    

	As of December 31,		As of September 30,
	2020		2021
Furniture and fixtures	$	2,341	$	2,179
Computer and office equipment	4,077		4,885
Telecommunications equipment	60,651		68,596
Leasehold improvements	6,285		6,260
Software	3,901		4,994
Internal-use software development	19,968		22,930
Automobile	502		605
Land	—		16,394
Total cost	97,725		126,843
Less—accumulated depreciation	(46,080)		(58,576)
Total property, plant and equipment, net	$	51,645	$	68,267

The Company capitalized $348 and $1,846 of software development costs for the three and nine months ended September 30, 2020, respectively, and $808 and $3,212 for the three and nine months ended September 30, 2021, respectively.

Amortization expense related to capitalized software development costs were $377 and $1,547 for the three and nine months ended September 30, 2020, respectively, and $459 and $1,404 for the three and nine months ended September 30, 2021, respectively. As of September 30, 2021, unamortized implementation costs related to cloud computing arrangements are $464, of which $140 are included in prepaid expenses and other current assets and $324 are included in other long-term assets.

The Company leases automobiles under leases accounted for as finance leases with expiration dates ranging from December 31, 2021 to June 30, 2025. As of September 30, 2021, cost and accumulated depreciation of the assets under finance leases recorded by the Company were $595 and $187, respectively.

The Company recognized depreciation expense, which includes amortization of capitalized software development costs, as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	2,284	$	2,976	$	6,958	$	8,947
Research and development	197		296		441		829
Sales and marketing	30		32		90		90
General and administrative	646		1,165		2,048		3,117
Total depreciation expense	$	3,157	$	4,469	$	9,537	$	12,983

21

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

8. Intangible Assets

Intangible assets, net consisted of the following as of December 31, 2020:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,111)	$	5,285	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquistion and other intangible assets	15,093		(9,044)		6,049
Voxbone acquistion:
Customer relationships	156,559		(1,739)		154,820		15
Developed technology	88,664		(1,478)		87,186		10
Total Voxbone acquisition	245,223		(3,217)		242,006
Total intangible assets, net	$	260,316	$	(12,261)	$	248,055

Intangible assets, net consisted of the following as of September 30, 2021:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,501)	$	4,895	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquisition and other intangible assets	15,093		(9,434)		5,659
Voxbone acquisition:
Customer relationships	147,874		(9,037)		138,837		15
Developed technology	83,746		(7,676)		76,070		10
Total Voxbone acquisition	231,620		(16,713)		214,907
Total intangible assets, net	$	246,713	$	(26,147)	$	220,566

22

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The Company recognized amortization expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	—	$	2,128	$	—	$	6,479
General and administrative	130		2,636		390		8,016
Total amortization expense	$	130	$	4,764	$	390	$	14,495

The remaining weighted average amortization period for definite lived intangible assets is 12.2 years.

Future estimated amortization expense for definite lived intangible assets is as follows:

	As of September 30,
	2021
2021 (remaining)	$	4,688
2022	18,753
2023	18,753
2024	18,753
2025	18,753
Thereafter	140,102
	$	219,802

9. Debt

Revolving Loan

On May 25, 2021, the Company terminated the Credit and Security Agreement, dated as of November 4, 2016 as amended and restated as of March 1, 2019, among the Company, Key Bank National Association, and KeyBanc Capital Markets Inc. (the “Credit Agreement”). The agreement provided for a secured $25,000 revolving credit facility (the “Credit Facility”). As of December 31, 2020 and at the date of termination, no outstanding indebtedness existed under the Credit Facility and the Company was in compliance with all financial and non-financial covenants.

As of December 31, 2020, unamortized debt issuance costs were $83, of which $74 were included in prepaid expenses and other current assets and $9 were included in other long-term assets. As of September 30, 2021, the outstanding debt issuance costs were $0.

Convertible Senior Notes and Capped Call Transactions

2026 Convertible Notes

On February 28, 2020, the Company issued $400,000 aggregate principal amount of 0.25% Convertible Notes due March 1, 2026 in a private placement to qualified institutional buyers pursuant to Rule 144A under the

23

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Securities Act (the “2026 Convertible Notes”). The interest on the 2026 Convertible Notes is payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2020.

The 2026 Convertible Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2026 Convertible Notes (the “2026 Indenture”) or if the 2026 Convertible Notes are not freely tradeable as required by the 2026 Indenture. The 2026 Convertible Notes will mature on March 1, 2026, unless earlier repurchased, redeemed by the Company, or converted pursuant to their terms. The total net proceeds from the 2026 Convertible Notes, after deducting initial purchaser discounts, costs related to the 2026 Capped Calls (as defined herein), and debt issuance costs, paid by the Company, were approximately $344,722.

Each $1 principal amount of the 2026 Convertible Notes is initially convertible into 10.9857 shares of the Company's Class A common stock, par value $0.001 per share, which is equivalent to an initial conversion price of approximately $91.03 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change, as defined in the 2026 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2026 Convertible Notes in connection with such make-whole fundamental change or during the relevant redemption period.

The 2026 Convertible Notes will be redeemable in whole or in part at the Company's option on or after March 6, 2023, but before the fortieth (40th) scheduled trading day before the maturity date, at a cash redemption price equal to 100% of the principal amount of the 2026 Convertible Notes to be redeemed, plus accrued and unpaid interest, if any, if the last reported sale price of the Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading days ending on, and including, the trading day immediately before the date the redemption notices were sent; and the trading day immediately before such notices were sent.

Prior to the close of business on the business day immediately preceding September 1, 2025, the 2026 Convertible Notes may be convertible at the option of the holders only under the following circumstances:

(1)during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price per share of the Company's Class A common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

(2)during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1 principal amount of 2026 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company's Class A common stock on such trading day and the conversion rate on such trading day;

(3)upon the occurrence of certain corporate events or distributions on its Class A common stock; and

(4)if the Company calls such 2026 Convertible Notes for redemption.

On or after September 1, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2026 Convertible Notes may, at their option, convert all or a portion of their 2026 Convertible Notes regardless of the foregoing conditions.

Prior to and during the three and nine months ended September 30, 2021, the conditional conversion feature of the 2026 Convertible Notes was triggered as the last reported sale price of the Company's Class A common stock

24

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

was more than or equal to 130% of the conversion price for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on or after June 30, 2020 (the last trading day of the calendar quarter), and therefore the 2026 Convertible Notes were convertible, in whole or in part, at the option of the holders between July 1, 2020 through September 30, 2021. Whether the 2026 Convertible Notes will be convertible following such period will depend on the continued satisfaction of this condition or another conversion condition in the future. The Company continues to classify the 2026 Convertible Notes as a long-term liability in its condensed consolidated balance sheet as of September 30, 2021, based on contractual settlement provisions.

Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A common stock, or a combination of cash and shares of Class A common stock, at the Company's election. It is the Company's current intent to settle the principal amount of the 2026 Convertible Notes with cash.

No sinking fund is provided for the 2026 Convertible Notes. Upon the occurrence of a fundamental change (as defined in the 2026 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2026 Convertible Notes for cash at a price equal to the principal amount of the 2026 Convertible Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In accounting for the issuance of the 2026 Convertible Notes, the Company separated the 2026 Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $125,160 and was determined by deducting the fair value of the liability component from the par value of the 2026 Convertible Notes. The difference represents the debt discount that is amortized to interest expense at an effective interest rate of 6.763% over the term of the 2026 Convertible Notes. The carrying amount of the equity component was $57,491 and is recorded in additional paid-in-capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense at an annual effective interest rate of 6.907% over the contractual terms of the 2026 Convertible Notes.

In accounting for the transaction costs related to the 2026 Convertible Notes, the Company allocated the total amount incurred to the liability and equity components of the 2026 Convertible Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were approximately $8,217, were recorded as an additional debt discount and are amortized to interest expense using the effective interest method over the contractual terms of the 2026 Convertible Notes. Issuance costs attributable to the equity component of $3,742 were netted with the equity component in stockholders’ equity.

2028 Convertible Notes

On March 16, 2021, the Company issued $250,000 aggregate principal amount of 0.50% Convertible Notes due April 1, 2028 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act (the “2028 Convertible Notes and, together with the 2026 Convertible Notes, the “Convertible Notes”). The interest on the 2028 Convertible Notes is payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2021.

The 2028 Convertible Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2028 Convertible Notes (the “2028 Indenture”) or if the 2028 Convertible Notes are not freely tradeable as required by the 2028 Indenture. The 2028 Convertible Notes will mature on April 1, 2028, unless earlier repurchased, redeemed by the Company, or converted pursuant to their terms. The total net proceeds from the 2028 Convertible Notes, after deducting initial purchaser discounts, costs related to the 2028 Capped Calls (as defined herein), and debt issuance costs, paid by the Company, were approximately $216,956.

25

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Each $1 principal amount of the 2028 Convertible Notes is initially convertible into 5.5781 shares of the Company's Class A common stock, par value $0.001 per share, which is equivalent to an initial conversion price of approximately $179.27 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change, as defined in the 2028 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2028 Convertible Notes in connection with such make-whole fundamental change or during the relevant redemption period.

The 2028 Convertible Notes will be redeemable in whole or in part at the Company's option on or after April 6, 2025, but before the fortieth (40th) scheduled trading day before the maturity date, at a cash redemption price equal to 100% of the principal amount of the 2028 Convertible Notes to be redeemed, plus accrued and unpaid interest, if any, if the last reported sale price of the Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading days ending on, and including, the trading day immediately before the date the redemption notices were sent; and the trading day immediately before such notices were sent.

On or after April 6, 2025 until the close of business on the scheduled trading day immediately preceding the maturity date, the 2028 Convertible Notes may be convertible at the option of the holders only under the following circumstances:

(1)during any calendar quarter commencing after the calendar quarter ending on June 30, 2021 (and only during such calendar quarter), if the last reported sale price per share of the Company's Class A common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

(2)during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1 principal amount of 2028 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company's Class A common stock on such trading day and the conversion rate on such trading day;

(3)upon the occurrence of certain corporate events or distributions on its Class A common stock; and

(4)if the Company calls such 2028 Convertible Notes for redemption.

On or after October 1, 2027, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2028 Convertible Notes may, at their option, convert all or a portion of their Convertible Notes regardless of the foregoing conditions.

Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A common stock, or a combination of cash and shares of Class A common stock, at the Company's election. It is the Company's current intent to settle the principal amount of the 2028 Convertible Notes with cash.

No sinking fund is provided for the 2028 Convertible Notes. Upon the occurrence of a fundamental change (as defined in the 2028 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2028 Convertible Notes for cash at a price equal to the principal amount of the 2028 Convertible Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In accounting for the issuance of the 2028 Convertible Notes, the Company separated the 2028 Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by

26

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $66,908 and was determined by deducting the fair value of the liability component from the par value of the 2028 Convertible Notes. The difference represents the debt discount that is amortized to interest expense at an effective interest rate of 5.125% over the term of the 2028 Convertible Notes. The carrying amount of the equity component was $39,389 and is recorded in additional paid-in-capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense at an annual effective interest rate of 4.959% over the contractual terms of the 2028 Convertible Notes.

In accounting for the transaction costs related to the 2028 Convertible Notes, the Company allocated the total amount incurred to the liability and equity components of the 2028 Convertible Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were approximately $5,525, were recorded as an additional debt discount and are amortized to interest expense using the effective interest method over the contractual terms of the 2028 Convertible Notes. Issuance costs attributable to the equity component of $2,019 were netted with the equity component in stockholders’ equity.

The net carrying amount of the liability components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Principal	$	400,000	$	400,000
Unamortized discount	(110,546)		(96,782)
Unamortized debt issuance costs	(7,258)		(6,354)
2026 Convertible Notes net carrying amount	282,196		296,864
2028 Convertible Notes:
Principal	—		250,000
Unamortized discount	—		(62,542)
Unamortized debt issuance costs	—		(5,167)
2028 Convertible Notes net carrying amount	—		182,291
Total net carrying amount	$	282,196	$	479,155

27

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	$	125,152	$	125,152
Issuance costs	(3,742)		(3,742)
2026 Convertible Notes net carrying amount	121,410		121,410
2028 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	—		66,908
Issuance costs	—		(2,019)
2028 Convertible Notes net carrying amount	—		64,889
Total net carrying amount	$	121,410	$	186,299

The following table sets forth the interest expense recognized related to the 2026 and 2028 Convertible Notes:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
2026 Convertible Notes:
Contractual interest expense	$	246	$	250	$	591	$	750
Amortization of debt discount	4,292		4,664		10,183		13,761
Amortization of debt issuance costs	283		306		669		903
Total interest expense related to the 2026 Convertible Notes	4,821		5,220		11,443		15,414
2028 Convertible Notes:
Contractual interest expense	—		313		—		678
Amortization of debt discount	—		2,029		—		4,366
Amortization of debt issuance costs	—		168		—		362
Total interest expense related to the 2028 Convertible Notes	—		2,510		—		5,406
Total interest expense	$	4,821	$	7,730	$	11,443	$	20,820

In connection with the offering of the 2026 Convertible Notes and the 2028 Convertible Notes, the Company entered into privately negotiated capped call transactions with certain counterparties (the “2026 Capped Calls” and the “2028 Capped Calls,” respectively and, collectively, the “Capped Calls”). The 2026 Capped Calls and the 2028 Capped Calls each have an initial strike price of approximately $91.03 and $179.27 per share, respectively, subject to certain adjustments, which corresponds to the initial conversion price of the 2026 Convertible Notes and the 2028 Convertible Notes. The 2026 Capped Calls and the 2028 Capped Calls have initial cap prices of $137.40 and $260.76 per share subject to certain adjustments, respectively. The 2026 Capped Calls and the 2028 Capped Calls cover, subject to anti-dilution adjustments, approximately 4,394,276 and 1,394,525 shares of Class A common stock for the 2026 Convertible Notes and 2028 Convertible Notes, respectively. The Capped Calls are generally intended to reduce or offset the potential dilution to the Class A common stock upon any conversion of the 2026 Convertible Notes and 2028 Convertible Notes with such reduction or offset, as the case

28

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

may be, subject to a cap based on the cap price. The Capped Calls expire on the earlier of (i) the last day on which any convertible securities remain outstanding and (ii) March 1, 2026 for the 2026 Capped Calls and April 1, 2028 for the 2028 Capped Calls, subject to earlier exercise. The Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting the Company, including a merger event, a tender offer, and a nationalization, insolvency or delisting involving the Company. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including changes in law, insolvency filings, and hedging disruptions. The Capped Call transactions are recorded in stockholders’ equity and are not accounted for as derivatives. The net cost of $43,320 and $25,500 incurred to purchase the 2026 Capped Calls and the 2028 Capped Calls, respectively, was recorded as a reduction to additional paid-in capital in the accompanying condensed consolidated balance sheets.

The Convertible Notes are effectively subordinated to the Company’s future senior secured indebtedness, if any, to the extent of the value of the collateral securing that indebtedness. The Convertible notes are the senior, unsecured obligations of the Company and are equal in right of payment with the Company’s future senior unsecured indebtedness, if any, senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated to the Convertible Notes and the Convertible Notes will be structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and preferred equity, if any, of the Company’s subsidiaries.

10. Segment and Geographic Information

The Company has two reportable segments, CPaaS and Other. Segments are primarily evaluated based on revenue and gross profit. The Company does not allocate operating expenses, interest expense or income tax expense to its segments. Accordingly, the Company does not report such information. Additionally, the Chief Operating Decision Maker does not evaluate the Company’s operating segments using discrete asset information. The segments share the majority of the Company’s assets. Therefore, no segment asset information is reported.

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
Revenue	$	73,762	$	107,376	$	199,959	$	312,561
Cost of revenue	39,346		54,841		108,467		164,616
Gross profit	$	34,416	$	52,535	$	91,492	$	147,945
Other
Revenue	$	10,996	$	23,262	$	30,107	$	52,214
Cost of revenue	6,181		17,554		15,428		35,166
Gross profit	$	4,815	$	5,708	$	14,679	$	17,048
Consolidated
Revenue	$	84,758	$	130,638	$	230,066	$	364,775
Cost of revenue	45,527		72,395		123,895		199,782
Gross profit	$	39,231	$	58,243	$	106,171	$	164,993

The Company’s long-lived assets were primarily held in the United States as of December 31, 2020 and September 30, 2021. As of December 31, 2020 and September 30, 2021, long-lived assets held outside of the United States were $11,249 and $10,156, respectively.

29

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The Company generates its revenue primarily in the United States. Revenue by geographic area is detailed in the table below (which is determined based on the customer billing address):

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
United States	$	71,809	$	94,135	$	194,414	$	275,986
International	1,953		13,241		5,545		36,575
Total	$	73,762	$	107,376	$	199,959	$	312,561
Other
United States	$	10,584	$	20,924	$	29,127	$	46,776
International	412		2,338		980		5,438
Total	$	10,996	$	23,262	$	30,107	$	52,214

11. Stockholders’ Equity

Preferred Stock

As of December 31, 2020 and September 30, 2021, the Company had authorized 10,000,000 shares of undesignated preferred stock, par value $0.001, of which no shares were issued and outstanding.

Common Stock

As of December 31, 2020 and September 30, 2021, the Company had authorized 100,000,000 shares of Class A common stock, par value $0.001 per share, with one vote per share and 20,000,000 shares of Class B common stock, par value $0.001 per share, with ten votes per share. As of December 31, 2020, 22,413,004 and 2,496,125 shares of Class A common stock and Class B common stock, respectively, were issued and outstanding. As of September 30, 2021, 23,165,119 and 1,965,170 shares of Class A common stock and Class B common stock, respectively, were issued and outstanding.

Shares of Class B common stock are convertible into shares of Class A common stock upon the stockholder’s voluntary written notice to the Company’s transfer agent or a transfer by the stockholder, subject to limited exceptions for transfers for estate planning purposes.

Reserved Shares

The Company had reserved shares of Class A common stock for issuance under stock-based award agreements as follows:

	As of December 31,	As of September 30,
	2020	2021
Stock options issued and outstanding	255,000	183,271
Nonvested restricted stock units issued and outstanding	450,614	369,614
Stock-based awards available for grant under the 2017 Plan	2,020,342	3,048,353
	2,725,956	3,601,238

12. Stock Based Compensation

2010 Stock Option Plan

30

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

As of July 26, 2010, the Company adopted the 2010 Equity Compensation Plan (the “2010 Plan”). On November 9, 2017, the 2010 Plan was terminated in connection with the Company’s initial public offering. Accordingly, no shares are available for future issuance under the 2010 Plan. However, the 2010 Plan continues to govern the terms and conditions of the outstanding awards granted thereunder.

2017 Incentive Award Plan

The Company’s 2017 Incentive Award Plan (the “2017 Plan”) became effective on November 9, 2017. The 2017 Plan provides for the grant of stock options, including incentive stock options and non-qualified stock options, stock appreciation rights, restricted stock, dividend equivalents, restricted stock units, and other stock or cash based awards to employees, consultants and directors of the Company. A total of 1,050,000 shares of the Company’s Class A common stock were originally reserved for issuance under the 2017 Plan. These available shares automatically increase each January 1, beginning on January 1, 2018, by 5% of the number of shares of the Company’s Class A common stock outstanding on the final day of the immediately preceding calendar year. On January 1, 2021, the shares available for grant under the 2017 Plan were automatically increased by 1,120,650 shares.

The terms of the stock option grants are determined by the Company’s Board of Directors. The Company’s stock options vest based on terms of the stock option agreements, which is generally over four years. The stock options have a contractual life of ten years.

Restricted stock units (“RSUs”) granted under the 2017 Plan are generally subject to a time-based vesting condition. The compensation expense related to these awards is based on the grant date fair value of the RSUs and is recognized on a ratable basis over the applicable service period. The Company granted RSUs to its non-employee members of the Board of Directors, some of which vested immediately while others vest 25% as of each calendar quarter immediately following the grant date. Certain RSUs awarded to executives vest over four years with 50% vesting in the first year in 12.5% increments on each calendar quarter immediately following the grant date and the remaining 50% earned over years two, three and four. Other RSUs awarded to executives and employees generally are earned over a service period of four years.

Stock Options

The following summarizes the stock option activity for the periods presented:

	Number of options outstanding	Weighted- average exercise price (per share)		Weighted- average remaining contract life (in years)	Aggregate intrinsic value  (in thousands)
Outstanding as of December 31, 2020	255,000	$	10.82	4.42	$	36,426
Granted	—	—
Exercised	(70,923)	12.68			9,059
Forfeited or cancelled	(806)	10.49
Outstanding as of September 30, 2021	183,271	$	10.10	3.59	$	14,694
Options vested and exercisable at September 30, 2021	178,878	$	9.79	3.53	$	14,398
Options vested and expected to vest as of September 30, 2021	183,032	$	10.09	3.59	$	14,678

Aggregate intrinsic value is computed based on the difference between the option exercise price and the fair value of the Company’s common stock as of September 30, 2021, based on the Company’s Class A common stock price as reported on the NASDAQ Global Select Market.

No options were granted for the three and nine months ended September 30, 2020 and 2021.

31

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The total estimated grant date fair value of options vested was $193 and $322 for the three and nine months ended September 30, 2020, respectively, and $153 and $199 for the three and nine months ended September 30, 2021, respectively.

As of September 30, 2021, total unrecognized compensation cost related to all non-vested stock options was $5, which will be amortized over a weighted-average period of 0.09 years.

Restricted Stock Units

The following summarizes the RSU activity for the periods presented:

	Number of awards outstanding	Weighted-average grant date fair value (per share)
Nonvested RSUs as of December 31, 2020	450,614	$	51.58
Granted	146,989	146.80
Vested	(173,695)	62.13
Forfeited or cancelled	(54,294)	74.82
Nonvested RSUs as of September 30, 2021	369,614	$	84.11

As of September 30, 2021, total unrecognized compensation cost related to non-vested RSUs was $25,509, which will be amortized over a weighted-average period of 2.86 years.

Stock-Based Compensation Expense

The Company recognized total stock-based compensation expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	46	$	52	$	161	$	190
Research and development	508		621		1,581		2,055
Sales and marketing	369		519		1,140		1,591
General and administrative	1,459		2,633		4,424		7,756
Total	$	2,382	$	3,825	$	7,306	$	11,592

13. Commitments and Contingencies

Operating Leases

The Company leases office space under operating lease agreements that expire over the next 5.25 years. See Note 6, “Right-of-Use Asset and Lease Liabilities” to the condensed consolidated financial statements, for additional details on the Company's operating lease commitments.

Contractual Obligations

On October 25, 2015, the Company entered into an agreement with a telecommunications service provider. The service agreement requires the Company to pay a monthly recurring charge associated with the services received. The service agreement is non-cancellable and contains annual minimum commitments. On August 1, 2020, the Company amended the agreement to require annual minimum commitments of $600 and $300 in 2021 and 2022, respectively. In addition, as of September 30, 2021, the Company has $17,287 in other non-cancellable purchase obligations, consisting of primarily network equipment maintenance and software license contracts, of which $11,824 will be fulfilled within one year.

32

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

On May 27, 2021, the Company entered into the Lease with the Developer for the Conveyed Parcel, together with the Project. The respective obligations of the Company and the Developer under the Lease were conditioned upon the Developer acquiring fee simple title to the Conveyed Parcel, which occurred on June 4, 2021. The Lease term will commence upon the Commencement Date and continue for the Initial Term. It is anticipated that the Commencement Date will occur in May 2023. If the Commencement Date does not occur within one hundred twenty (120) days from the scheduled Commencement Date, the Company shall be entitled to certain rent abatements, as described in the Lease. If the Commencement Date is not delivered within twelve (12) months of the scheduled Commencement Date, the Company may terminate the Lease.

The Company has the option to renew the Initial Term for two ten-year periods. Base rent payments will begin on the Commencement Date. The initial base rent will increase by 1.85% on each anniversary of the Commencement Date. Total lease payments over the Initial Term are approximately $496,000. See Note 6, “Right-of-Use Asset and Lease Liabilities” to the condensed consolidated financial statements, for additional details on the Company's operating lease commitments.

Legal Matters

The Company is involved as a defendant in various litigation, including but not limited to lawsuits alleging that the Company failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services pursuant to applicable laws in various jurisdictions.

While the results of these legal proceedings cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on the Company’s financial position or results of operations.    

14. Employee Benefit Plans

The Company sponsors a U.S. defined contribution 401(k), which allows eligible U.S.-based employees to defer a portion of their compensation. The Company, at its discretion, may make matching contributions. With the acquisition of Voxbone S.A. on November 1, 2020, the Company assumed sponsorship for Voxbone S.A.’s U.S. defined contribution 401(k). In connection with that acquisition, the Company also assumed sponsorship for a non-U.S. defined contribution plan for which it pays fixed contributions into a separate entity. The Company has no legal or constructive obligations to pay further contributions if the fund does not hold sufficient assets to pay all employees the benefits relating to employee service in the current or prior periods. The contributions are recognized as employee benefit expense when they are due. The Company made matching contributions for the defined contribution plans of $474 and $1,583 for the three and nine months ended September 30, 2020, respectively, and $811 and $2,565 for the three and nine months ended September 30, 2021, respectively.

In addition, as a result of the acquisition of Voxbone S.A., the Company assumed sponsorship for Voxbone S.A.’s non-U.S. defined benefit pension plans. The liability recognized in the other liabilities line item of the balance sheet in respect to these plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of the plan assets. The defined benefit obligation is calculated annually by an independent actuary using the Projected Unit Credit Method.

The Company reports the service cost component of net periodic benefit cost in the same line item as other compensation costs arising from the services rendered by the employee and records the other components of net periodic benefit cost in other expense, net. Net periodic benefit costs for the non-U.S. defined benefit pension plan were $0 for the three and nine months ended September 30, 2020, and $105 and $323 for the three and nine months ended September 30, 2021, respectively.

33

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

Pretax amounts for net periodic benefit cost and other amounts for the defined benefit pension plans consisted of the following components:

	Three months ended September 30,			Nine months ended September 30,
	2021			2021
Service cost	$	104		$	318
Interest cost	5			16
Return on plan assets	(4)			(11)
Net periodic pension cost	105			323
Total recognized in net periodic benefit cost	$	105		$	323
Defined benefit cost:
Expected long-term rate of return on plan assets	0.50		%	0.50		%

15. Income Taxes

At the end of each interim reporting period, the Company determines the income tax provision by using an estimate of the annual effective tax rate, adjusted for discrete items occurring in the quarter. The effective income tax rate reflects the effect of federal and state income taxes and the permanent impacts of differences in book and tax accounting.

The Company’s effective tax rate was (0.4)% and (134.2)% for the three and nine months ended September 30, 2020, respectively, and (4.8)% and (1.3)% for the three and nine months ended September 30, 2021, respectively. The change in tax rate is primarily due to the valuation allowance recorded against U.S. deferred tax assets and the mix of earnings between various jurisdictions. The Company continues to maintain a valuation allowance for its U.S. federal and state net deferred tax assets.

Judgment is required in determining whether deferred tax assets will be realized in full or in part. Management assesses the available positive and negative evidence on a jurisdictional basis to estimate if deferred tax assets will be recognized and when it is more likely than not that all or some deferred tax assets will not be realized, and a valuation allowance must be established.

The Company’s effective tax rate for the three and nine months ended September 30, 2021 is lower than the U.S. federal statutory rate of 21.0% primarily due to the valuation allowance recorded against U.S. deferred tax assets.

16. Related Parties

The Company has certain involvement with Relay, Inc. (f/k/a Republic Wireless, Inc.) (“Relay”) via ongoing services arrangements, with these ongoing services arrangements creating a variable interest in Relay.

The Company recorded a reduction of rent expense under the Facilities Sharing Agreement of $96 and $288 for the three and nine months ended September 30, 2020, respectively, and $96 and $288 for the three and nine months ended September 30, 2021, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. No amounts were due to the Company under the Facilities Sharing Agreement as of December 31, 2020 and September 30, 2021.

The Company provided telecommunication services to Relay under the Master Services Agreement of $541 and $1,657 for the three and nine months ended September 30, 2020, respectively, and $425 and $1,374 for the three and nine months ended September 30, 2021, respectively. The Company recognized such amounts as revenue

34

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

in the accompanying condensed consolidated statements of operations. As of December 31, 2020 and September 30, 2021, the Company had a receivable of $170 and $142, respectively, under the Master Services Agreement.

Bandwidth had collected on behalf of, and remitted withholding tax to, Relay of $747 and $1,295 for the three and nine months ended September 30, 2020, respectively, and $16 and $360 for the three and nine months ended September 30, 2021, respectively, for Relay employees that exercised Bandwidth stock options. As of December 31, 2020 and September 30, 2021, the Company had amounts payable to Relay of $0 and $16, respectively.

The Company is compensated by Relay for services performed by the Company’s legal department based on costs incurred. The Company received net compensation of $16 and $63 for the three and nine months ended September 30, 2020, respectively, and $6 and $19 for the three and nine months ended September 30, 2021, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. As of December 31, 2020 and September 30, 2021, the Company had a receivable of $2 under this agreement.

17. Basic and Diluted Loss per Common Share

Basic net loss per share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. The Company is in a net loss position for the three and nine months ended September 30, 2020 and 2021 and therefore diluted shares equals basic shares.

35

Notes to Condensed Consolidated Financial Statements (continued)

(In thousands, except share and per share amounts)

The components of basic and diluted loss per share are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Earnings per share
Net loss attributable to common stockholders	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Net loss per share, basic and diluted	$	(0.10)	$	(0.28)	$	(1.01)	$	(0.77)
Weighted average number of common shares outstanding, basic and diluted	24,175,762		25,114,762		23,905,322		25,075,941

The following common share equivalents were excluded from the weighted average shares used to calculate net loss per common share because their effects would have been anti-dilutive:

	As of September 30,
	2020	2021
Stock options issued and outstanding	269,108	183,271
Restricted stock units issued and outstanding	447,449	369,614
Convertible senior notes (1)	708,073	1,316,199
Total	1,424,630	1,869,084

________________________

(1) As of September 30, 2020 and September 30, 2021, the Company used the treasury stock method to calculate the dilutive impact of the 2026 and 2028 Convertible Notes because at that time the Company expected to settle the principal amount of these notes in cash and any excess in shares of the Company's Class A common stock. As of September 30, 2020 and September 30, 2021, the conversion spread, calculated using the average market price of Class A common stock during the period consistent with the treasury stock method, had a dilutive impact for the 2026 Convertible Notes on diluted net income per share of Class A common stock when the average market price of the Company's Class A common stock for a given period exceeded the conversion price of $91.03 per share. As of September 30, 2021, the conversion spread for the 2028 Convertible Notes was anti-dilutive as the average market price of the Company's Class A common stock for a given period did not exceed the conversion price of $179.27 per share.

36

Management’s Discussion and Analysis

Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our condensed consolidated financial statements and related notes that are included elsewhere in this Quarterly Report on Form 10-Q. This discussion contains forward-looking statements based upon current plans, expectations and beliefs that involve risks and uncertainties. Our actual results may differ materially from those anticipated in these forward-looking statements as a result of various factors, including those set forth under “Risk Factors” in this Quarterly Report on Form 10-Q. Our fiscal year ends on December 31.

Overview

We are a leading global enterprise cloud communications company. Our solutions include a broad range of software Application Programming Interfaces (“APIs”) for voice, messaging and emergency services. Our sophisticated and easy-to-use software APIs allow enterprises to enhance their products and services by incorporating advanced, global connectivity for voice, messaging and emergency services communications capabilities. Companies use our platform to more frequently and seamlessly connect with their end users, add voice calling capabilities to applications and devices, transition from on-premise to cloud-based communication tools and applications, integrate messaging capabilities into applications or software, build interactive voice response systems for contact centers, and offer end users new mobile application experiences including emergency services and improve employee productivity, among other use cases. We have established a reputation as a leader in the Communications Platform-as-a-Service (“CPaaS”) space through our innovation-rich culture and focus on empowering enterprises with end-to-end communications solutions.

We are the only CPaaS provider in the industry that owns and operates a nationwide IP voice network in the U.S. In 2020, we acquired Voxbone, a leading European-based communications platform with its own IP voice network assembled by building relationships with local carriers around the globe. Our deep U.S. presence and global platform extending across more than 60 countries serves enterprises in countries representing more than 90% of global gross domestic product. We believe that our current and future customers will benefit from using a unified software platform, network and team to serve people around the world.

Our voice software APIs allow enterprises to make and receive phone calls and create advanced voice experiences. Integration with our purpose-built IP voice network ensures enterprise-grade functionality and secure, high-quality connections. Our messaging software APIs provide enterprises with advanced tools to connect with end users via messaging. Our customers also use our solutions to enable 911 response capabilities, real-time provisioning and activation of phone numbers and toll-free number messaging.

We believe our network is capital-efficient and supports the applications and experiences that make a difference in the way enterprises communicate. Since a communications platform is only as strong as the network that backs it, we believe our network provides a significant competitive advantage in the control, quality, pricing power and scalability of our offering. We are able to control the quality and provide the support our customers expect, while meeting regulatory, scalability and cost requirements more efficiently.

For the three months ended September 30, 2020 and 2021, total revenue was $84.8 million and $130.6 million, respectively. For the three months ended September 30, 2020 and 2021, CPaaS revenue was $73.8 million and $107.4 million, respectively, representing an increase of 46%. Net loss for the three months ended September 30, 2020 and 2021 was $2.4 million and $6.9 million, respectively. For the three months ended September 30, 2020 and 2021, the number of active CPaaS customer accounts was 2,015 and 3,173, respectively, representing a year over year increase of 57%.

Acquisition of Voxbone

On November 2, 2020, we acquired all of the A Ordinary Shares, B Ordinary Shares and C Ordinary Shares of Voice Topco Limited (“Voice Topco”) through a Share Purchase Agreement (the “Share Purchase Agreement”

37

Management’s Discussion and Analysis

and such purchase, the “Share Purchase”) (the “Acquisition”). Voice Topco directly or indirectly holds all of the issued and outstanding shares of Voxbone S.A., which (with its subsidiaries) is the operating subsidiary of Voice Topco. The Acquisition was valued at €446 million. As consideration for the Share Purchase, we (i) paid the Sellers (as defined in the Share Purchase Agreement) approximately $400 million (or approximately €338 million based on prevailing exchange rates at the close of business on October 9, 2020) at the Closing (as disclosed in the Share Purchase Agreement) and (ii) issued to the Sellers at the Closing shares of our Class A common stock, with an aggregate value of approximately €108 million (or approximately $128 million based on prevailing exchange rates at the close of business on October 9, 2020).

COVID-19 Update

In December 2019, a novel coronavirus disease (“COVID-19”) was reported and in January 2020, the World Health Organization (“WHO”) declared it a Public Health Emergency of International Concern. On February 28, 2020, the WHO raised its assessment of the COVID-19 threat from high to very high at a global level due to the continued increase in the number of cases and affected countries, and on March 11, 2020, the WHO characterized COVID-19 as a pandemic. The broader implications of COVID-19 on our results of operations and overall financial performance remain uncertain. The COVID-19 pandemic and its adverse effects have been prevalent in the locations where we, our customers, suppliers and third-party business partners conduct business. During the three months ended September 30, 2021, we experienced stable or increased usage by our customers that had been most impacted by COVID-19, including large enterprise customers that offer unified communications as a service (“UCaaS”) and meeting solutions, travel, hospitality and ridesharing services, among others. We acknowledge that there may be additional impacts to the economy and our business going forward as a result of COVID-19, and we expect that there may be some volatility in customer demand and buying habits as the pandemic continues. Recently, we have re-opened our U.S. offices for employees to return, subject to applicable government regulations. Appropriate measures are being taken to protect the health of our employees who return to the office. We have also reinstated business travel, subject to applicable government regulations. As the COVID-19 pandemic abates, we may experience curtailed customer demand that could materially adversely impact our business, results of operations and overall financial performance in future periods. Specifically, we may experience impact from enterprises reducing usage of our services or delaying decisions to implement our services. As a result, the effect of the COVID-19 pandemic will not be fully reflected in our results of operations and overall financial performance until future periods. See “Item 1A. Risk Factors” for further discussion of the possible impact of the COVID-19 pandemic on our business.

DDoS Attack

Beginning on September 25, 2021, Bandwidth’s communications network was subjected to a distributed denial of service (“DDoS”) attack initially causing intermittent communications services disruptions affecting certain of our markets and customers. A DDoS attack is a malicious attempt to disrupt the normal traffic of a targeted server, service or network by overwhelming the target or its surrounding infrastructure with a flood of unwanted internet traffic from multiple sources, resulting in the slowdown or blockage of legitimate traffic. Bandwidth’s mitigation efforts, in conjunction with our partners from leading cybersecurity firms, are proving successful. Bandwidth’s network has been largely stable and operating at normal service levels since the evening of September 29, 2021, although there have been some continued intermittent disruptions. Based on preliminary usage data and currently known information, the company estimates that the impact of the DDoS attack may reduce CPaaS revenue for the full year 2021 by an amount between $9 million and $12 million, inclusive of $0.7 million revenue impact in the third quarter.

38

Management’s Discussion and Analysis

Key Performance Indicators

We monitor the following key performance indicators (“KPIs”) to help us evaluate our business, identify trends affecting our business, formulate business plans, and make strategic decisions. We believe the following KPIs are useful in evaluating our business:

	Three months ended September 30,						Nine months ended September 30,
	2020			2021			2020			2021
	(Dollars in thousands)
Number of active CPaaS customers (as of period end)	2,015			3,173			2,015			3,173
Dollar-based net retention rate	131		%	108		%	130		%	116		%
Adjusted EBITDA	$	9,275		$	14,165		$	17,896		$	41,318
Free cash flow	$	9,313		$	12,186		$	(51)		$	(4,631)

Number of Active CPaaS Customer Accounts

We believe the number of active CPaaS customer accounts is an important indicator of the growth of our business, the market acceptance of our platform and our future revenue trends. We define an active CPaaS customer account at the end of any period as an individual account, as identified by a unique account identifier, for which we have recognized at least $100 of revenue in the last month of the period. We believe that the use of our platform by active CPaaS customer accounts at or above the $100 per month threshold is a stronger indicator of potential future engagement than trial usage of our platform at levels below $100 per month. A single organization may constitute multiple unique active CPaaS customer accounts if it has multiple unique account identifiers, each of which is treated as a separate active CPaaS customer account. Customers who pay after using our platform and customers that have credit balances are included in the number of active CPaaS customer accounts. Customers from our Other segment are excluded in the number of active CPaaS customer accounts, unless they are also CPaaS customers.

For the three and nine months ended September 30, 2020 and 2021, revenue from active CPaaS customer accounts represented approximately 99% of total CPaaS revenue.

Dollar-Based Net Retention Rate

Our ability to drive growth and generate incremental revenue depends, in part, on our ability to maintain and grow our relationships with our existing customers that generate CPaaS revenue and seek to increase their use of our platform. We track our performance in this area by measuring the dollar-based net retention rate for our customers who generate CPaaS revenue. Our dollar-based net retention rate compares the CPaaS revenue from customers in a quarter to the same quarter in the prior year. To calculate the dollar-based net retention rate, we first identify the cohort of customers that generate CPaaS revenue and that were customers in the same quarter of the prior year. The dollar-based net retention rate is obtained by dividing the CPaaS revenue generated from that cohort in a quarter, by the CPaaS revenue generated from that same cohort in the corresponding quarter in the prior year. When we calculate dollar-based net retention rate for periods longer than one quarter, we use the average of the quarterly dollar-based net retention rates for the quarters in such period. Our dollar-based net retention rate increases when such customers increase usage of a product, extend usage of a product to new applications or adopt a new product. Our dollar-based net retention rate decreases when such customers cease or reduce usage of a product or when we lower prices on our solutions.

39

Management’s Discussion and Analysis

As our customers grow their business and extend the use of our platform, they sometimes create multiple customer accounts with us for operational or other reasons. As such, when we identify a significant customer organization (defined as a single customer organization generating more than 1% of CPaaS revenue in a quarterly reporting period) that has created a new CPaaS customer, this new customer is tied to, and CPaaS revenue from this new customer is included with, the original CPaaS customer for the purposes of calculating this metric.

Key Components of Statements of Operations

Revenue

We generate a majority of our revenue from our CPaaS segment. CPaaS revenue is derived from voice usage, phone number services, 911-enabled phone number services, messaging services and other services. We generate a portion of our CPaaS revenue from usage-based fees, which include voice calling and messaging services.

For the three months ended September 30, 2020 and 2021, we generated 75% and 73% of our CPaaS revenue, respectively, from usage-based fees. We also earn monthly fees from services such as phone number services, messaging services and 911 access services. For the three months ended September 30, 2020 and 2021, we generated 23% and 25% of our CPaaS revenue, respectively, in each period from monthly per unit fees. The remaining 2% of our CPaaS revenue is generated from other miscellaneous services.

For the nine months ended September 30, 2020 and 2021, we generated 74% and 73% of our CPaaS revenue from usage-based fees, respectively. We also earn monthly fees from services such as phone number services, messaging services and 911 access services. For the nine months ended September 30, 2020 and 2021, we generated 24% and 25% of our CPaaS revenue in each period from monthly per unit fees, respectively. The remaining 2% of our CPaaS revenue is generated from other miscellaneous services.

The remainder of our revenue is generated by our Other segment. Other revenue is composed of revenue earned from our non-CPaaS legacy services and indirect revenue. Other revenue as a percentage of total revenue is expected to continue to decline over time.

We recognize accounts receivable at the time the customer is invoiced. Additionally, we record a receivable for unbilled revenue if the services have been delivered and are billable in subsequent periods. Unbilled revenue made up 56% and 43% of outstanding accounts receivable, net of allowance for doubtful accounts, as of September 30, 2020 and 2021, respectively.

Cost of Revenue and Gross Margin

CPaaS cost of revenue consists primarily of fees paid to other network service providers from whom we buy services such as minutes of use, phone numbers, messages, porting of customer numbers and network circuits. Cost of revenue also contains costs related to support of our IP voice network, web services, cloud infrastructure, capacity planning and management, rent for network facilities, software licenses, hardware and software maintenance fees and network engineering services. Personnel costs (including non-cash stock-based compensation expenses) associated with personnel who are responsible for the delivery of services, operation and maintenance of our communications network, and customer support, as well as third-party support agreements and depreciation of network equipment, amortization of internally developed software and gain (loss) on disposal of property and equipment are also included in cost of revenue.

Other cost of revenue consists of costs supporting non-CPaaS services including leased circuit costs paid to third party providers, internet connectivity expenses, minutes of use, direct operations, contractors, regulatory fees, surcharges and other pass-through costs and software and hardware maintenance fees.

Gross margin is calculated by subtracting cost of revenue from revenue, divided by total revenue, expressed as a percentage. Our cost of revenue and gross margin have been, and will continue to be, affected by several

40

Management’s Discussion and Analysis

factors, including the timing and extent of our investments in our network, our ability to manage off-network minutes of use and messaging costs, the product mix of revenue, the timing of amortization of capitalized software development costs and fluctuations in the price we charge our customers for services.

Operating Expenses

The most significant components of operating expenses are personnel costs, which consist of salaries, benefits, bonuses, and stock-based compensation expenses. We also incur other non-personnel costs related to our general overhead expenses, including facility expenses, software licenses, web services, depreciation and amortization of assets unrelated to delivery of our services. We expect that our operating expenses will increase in absolute dollars.

Research and Development

Research and development (“R&D”) consists primarily of personnel costs (including non-cash stock-based compensation expenses), outsourced software development and engineering service and cloud infrastructure fees for staging and development of outsourced engineering services. We capitalize the portion of our software development costs in instances where we invest resources to develop software for internal use. We plan to continue to invest in R&D to enhance current product offerings and develop new services.

Sales and Marketing

Sales and marketing expenses consist primarily of personnel costs, including commissions for our sales employees and non-cash stock-based compensation expenses. Sales and marketing expenses also include expenditures related to advertising, marketing, our brand awareness activities, sales support and professional services fees.

We focus our sales and marketing efforts on creating sales leads and establishing and promoting our brand. We plan to continue to invest in sales and marketing in order to expand our CPaaS customer base by growing headcount, driving our go-to-market strategies, building brand awareness, advertising and sponsoring additional industry marketing events.

General and Administrative

General and administrative expenses consist primarily of personnel costs, including stock-based compensation, for our accounting, finance, legal, human resources and administrative support personnel and executives. General and administrative expenses also include costs related to product management and reporting, customer billing and collection functions, information services, professional services fees, credit card processing fees, rent associated with our headquarters in Raleigh, North Carolina and our other offices, and depreciation and amortization.

Income Taxes

For the three months ended September 30, 2020 and 2021, our effective tax rate was (0.4)% and (4.8)%, respectively. The decrease in our effective tax rate is primarily due to the acquisition of Voxbone in the fourth quarter of 2020 which has resulted in tax expense in additional jurisdictions without valuation allowances.

For the nine months ended September 30, 2020 and 2021, our effective tax rate was (134.2)% and (1.3)%, respectively. The increase in our effective tax rate is primarily due to the change in judgment related to the realizability of certain deferred tax assets and the resulting valuation allowance.

Judgment is required in determining whether deferred tax assets will be realized in full or in part. Management assesses the available positive and negative evidence on a jurisdictional basis to estimate if deferred tax assets will be recognized and when it is more likely than not that all or some deferred tax assets will not be realized, and a valuation allowance must be established. As of September 30, 2021, the Company continues to maintain a valuation allowance for its U.S. federal and state and U.K. net deferred tax assets.

41

Management’s Discussion and Analysis

Non-GAAP Financial Measures

We use Non-GAAP gross profit, Non-GAAP gross margin, Non-GAAP net income, Adjusted EBITDA and free cash flow for financial and operational decision making and to evaluate period-to-period differences in our performance. Non-GAAP gross profit, Non-GAAP gross margin, Non-GAAP net income, Adjusted EBITDA and free cash flow are non-GAAP financial measures, which we believe are useful for investors in evaluating our overall financial performance. We believe these measures provide useful information about operating results, enhance the overall understanding of past financial performance and future prospects and allow for greater transparency with respect to key performance indicators used by management in its financial and operational decision making. See below for a reconciliation of each of the non-GAAP financial measures described below.

Non-GAAP Gross Profit and Non-GAAP Gross Margin

GAAP defines gross profit as revenue less cost of revenue. Cost of revenue includes all expenses associated with our various service offerings as more fully described under the caption “Key Components of Statement of Operations-Cost of Revenue and Gross Margin.” We define Non-GAAP gross profit as gross profit after adding back the following items:

•depreciation and amortization;

•amortization of acquired intangible assets related to acquisitions; and

•stock-based compensation.

We add back depreciation and amortization, amortization of acquired intangible assets related to acquisitions, and stock-based compensation, because they are non-cash items. We eliminate the impact of these non-cash items because we do not consider them indicative of our core operating performance. Their exclusion facilitates comparisons of our operating performance on a period-to-period basis. We believe showing gross margin, as Non-GAAP to remove the impact of these non-cash expenses, such as depreciation and amortization and stock-based compensation, is helpful to investors in assessing our gross profit and gross margin performance in a way that is similar to how management assesses our performance.

We calculate Non-GAAP gross margin by dividing Non-GAAP gross profit by revenue, expressed as a percentage of revenue.

Management uses Non-GAAP gross profit and Non-GAAP gross margin to evaluate operating performance and to determine resource allocation among our various service offerings. We believe Non-GAAP gross profit and Non-GAAP gross margin provide useful information to investors and others to understand and evaluate our operating results in the same manner as our management and board of directors and allows for better comparison of financial results among our competitors. Non-GAAP gross profit and Non-GAAP gross margin may not be comparable to similarly titled measures of other companies because other companies may not calculate Non-GAAP gross profit and Non-GAAP gross margin or similarly titled measures in the same manner as we do.

42

Management’s Discussion and Analysis

Consolidated

	Three months ended September 30,						Nine months ended September 30,
	2020			2021			2020			2021
	(In thousands)
Consolidated Gross Profit	$	39,231		$	58,243		$	106,171		$	164,993
Consolidated Gross Profit Margin %	46		%	45		%	46		%	45		%
Depreciation	2,284			2,976			6,958			8,947
Amortization of acquired intangible assets	—			2,128			—			6,479
Stock-based compensation	46			52			161			190
Non-GAAP Gross Profit	$	41,561		$	63,399		$	113,290		$	180,609
Non-GAAP Gross Margin %	49		%	49		%	49		%	50		%

By Segment

CPaaS

	Three months ended September 30,						Nine months ended September 30,
	2020			2021			2020			2021
	(In thousands)
CPaaS Gross Profit	$	34,416		$	52,535		$	91,492		$	147,945
CPaaS Gross Profit Margin %	47		%	49		%	46		%	47		%
Depreciation	2,284			2,976			6,958			8,947
Amortization of acquired intangible assets	—			2,128			—			6,479
Stock-based compensation	46			52			161			190
Non-GAAP CPaaS Gross Profit	$	36,746		$	57,691		$	98,611		$	163,561
Non-GAAP CPaaS Gross Margin %	50		%	54		%	49		%	52		%

Non-GAAP Net Income

We define Non-GAAP net income as net income or loss adjusted for certain items affecting period-to-period comparability. Non-GAAP net income excludes:

•stock-based compensation;

•amortization of acquired intangible assets related to acquisitions;

•amortization of debt discount and issuance costs for convertible debt;

•acquisition related expenses;

•impairment charges of intangibles assets, if any;

•loss (gain) on disposal of property and equipment;

•estimated tax impact of above adjustments;

•income tax benefit resulting from excess tax benefits associated with the exercise of stock options, vesting of restricted stock units and equity compensation; and

•expense resulting from recording the valuation allowance on our deferred tax assets.

43

Management’s Discussion and Analysis

We calculate Non-GAAP basic and diluted shares by adding the weighted average of outstanding Series A redeemable convertible preferred stock, if any, to the weighted average number of outstanding basic and diluted shares, respectively. The tax-effect of Non-GAAP adjustments is determined using a blended rate of statutory tax rates in the jurisdictions where the Company has tax filings. When the Company has a valuation allowance recorded and no tax benefits will be recognized, the rate is considered to be zero.

We believe Non-GAAP net income is a meaningful measure because by removing certain non-cash and other expenses we are able to evaluate our operating results in a manner we believe is more indicative of the current period’s performance. We believe the use of Non-GAAP net income may be helpful to investors because it provides consistency and comparability with past financial performance, facilitates period-to-period comparisons of results of operations and assists in comparisons with other companies, many of which may use similar Non-GAAP financial information to supplement their GAAP results.

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
	(In thousands)
Net loss	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Stock-based compensation	2,382		3,825		7,306		11,592
Amortization of acquired intangibles	130		4,764		390		14,495
Amortization of debt discount and issuance costs for convertible debt	4,575		7,168		10,852		19,393
Acquisition-related expenses	1,745		—		1,745		—
Loss on disposal of property and equipment	3		21		263		357
Estimated tax effects of adjustments (1)	—		(2,348)		—		(3,502)
Valuation allowance (2)	—		—		14,173		215
Non-GAAP net income	$	6,483	$	6,486	$	10,678	$	23,362
Net loss per share, basic and diluted	$	(0.10)	$	(0.28)	$	(1.01)	$	(0.77)
Non-GAAP net income per Non-GAAP share
Basic	$	0.27	$	0.26	$	0.45	$	0.93
Diluted	$	0.24	$	0.25	$	0.42	$	0.87
Non-GAAP weighted average number of shares outstanding
Non-GAAP basic shares	24,175,762		25,114,762		23,905,322		25,075,941
Convertible debt conversion	1,692,546		929,971		708,073		1,316,199
Stock options issued and outstanding	273,681		171,623		507,530		186,665
Nonvested RSUs outstanding	367,790		159,888		333,329		214,562
Non-GAAP diluted shares	26,509,779		26,376,244		25,454,254		26,793,367

________________________

(1) The Non-GAAP tax-effect adjustments are calculated based on statutory tax rates in the jurisdictions where the Company has tax filings. When the Company has a valuation allowance recorded and no tax benefits will be recognized, the rate in that jurisdiction is considered to be zero. The rate was 0.0% and 7.6% for the nine months ended September 30, 2020 and 2021, respectively.

(2) The Company recognized a tax expense of $0 and $14,173 to record a valuation allowance on U.S. deferred tax assets in the three and nine months ended September 30, 2020 and $0 and $215 in the three and nine months ended September 30, 2021, respectively.

44

Management’s Discussion and Analysis

Adjusted EBITDA

We define Adjusted EBITDA as net income or losses from continuing operations, adjusted to reflect the addition or elimination of certain income statement items including, but not limited to:

•income tax provision (benefit);

•interest (income) expense, net;

•depreciation and amortization expense;

•acquisition related expenses;

•stock-based compensation expense;

•impairment of intangible assets, if any; and

•loss (gain) on disposal of property and equipment, if any.

Adjusted EBITDA is a key measure used by management to understand and evaluate our core operating performance and trends, to generate future operating plans and to make strategic decisions regarding the allocation of capital. In particular, the exclusion of certain expenses in calculating Adjusted EBITDA facilitates comparisons of our operating performance on a period-to-period basis.

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
	(In thousands)
Net loss	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Income tax provision (1)	10		315		13,783		255
Interest expense, net	4,200		7,715		8,923		20,824
Depreciation	3,157		4,469		9,537		12,983
Amortization	130		4,764		390		14,495
Acquisition-related expenses	1,745		—		1,745		—
Stock-based compensation	2,382		3,825		7,306		11,592
Loss on disposal of property and equipment	3		21		263		357
Adjusted EBITDA	$	9,275	$	14,165	$	17,896	$	41,318

________________________

(1) Includes $0 and $14,173 of tax expense to record a valuation allowance on U.S. deferred tax assets for the three and nine months ended September 30, 2020, respectively, and $0 and $215 for the three and nine months ended September 30, 2021, respectively.

Free Cash Flow

Free cash flow represents net cash provided by or used in operating activities less net cash used in the acquisition of property and equipment and capitalized development costs of software for internal use. We believe free cash flow is a useful indicator of liquidity and provides information to management and investors about the amount of cash generated from our core operations that can be used for investing in our business. Free cash flow has certain limitations in that it does not represent the total increase or decrease in the cash balance for the period, it does not take into consideration investment in long-term securities, nor does it represent the residual cash flows available for discretionary expenditures. Therefore, it is important to evaluate free cash flow along with our condensed consolidated statements of cash flows.

45

Management’s Discussion and Analysis

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
	(In thousands)
Net cash provided by operating activities	$	11,647	$	14,843	$	11,331	$	23,688
Net cash used in investing in capital assets (1) (2)	(2,334)		(2,657)		(11,382)		(28,319)
Free cash flow	$	9,313	$	12,186	$	(51)	$	(4,631)

________________________

(1) Represents the acquisition cost of property, equipment and capitalized development costs for software for internal use.

(2) Includes the net cash used from the purchase of land of $(30,017) offset by the proceeds from sale of land of $17,462 from investing activities of the statement of cash flows for the nine months ended September 30, 2021.

46

Management’s Discussion and Analysis

Results of Operations

Consolidated Results of Operations

The following table sets forth the consolidated statements of operations for the periods indicated.

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
	(In thousands)
Revenue:
CPaaS revenue	$	73,762	$	107,376	$	199,959	$	312,561
Other revenue	10,996		23,262		30,107		52,214
Total revenue	84,758		130,638		230,066		364,775
Cost of revenue:
CPaaS cost of revenue	39,346		54,841		108,467		164,616
Other cost of revenue	6,181		17,554		15,428		35,166
Total cost of revenue	45,527		72,395		123,895		199,782
Gross profit:
CPaaS	34,416		52,535		91,492		147,945
Other	4,815		5,708		14,679		17,048
Total gross profit	39,231		58,243		106,171		164,993
Operating expenses:
Research and development	10,232		13,359		29,316		39,509
Sales and marketing	9,001		13,592		27,073		38,168
General and administrative	18,134		30,354		51,070		85,481
Total operating expenses	37,367		57,305		107,459		163,158
Operating income (loss)	1,864		938		(1,288)		1,835
Other expense, net
Interest expense, net	(4,200)		(7,715)		(8,923)		(20,824)
Other (expense) income, net	(6)		148		(57)		56
Total other expense, net	(4,206)		(7,567)		(8,980)		(20,768)
Loss before income taxes	(2,342)		(6,629)		(10,268)		(18,933)
Income tax provision	(10)		(315)		(13,783)		(255)
Net loss	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)

47

Management’s Discussion and Analysis

The following table sets forth our results of operations as a percentage of our total revenue for the periods presented. *

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Revenue:
CPaaS revenue	87	%	82	%	87	%	86	%
Other revenue	13	%	18	%	13	%	14	%
Total revenue	100	%	100	%	100	%	100	%
Cost of revenue:
CPaaS cost of revenue	46	%	42	%	47	%	45	%
Other cost of revenue	7	%	13	%	7	%	10	%
Total cost of revenue	53	%	55	%	54	%	55	%
Gross profit:
CPaaS	40	%	40	%	40	%	41	%
Other	6	%	5	%	6	%	4	%
Total gross profit	46	%	45	%	46	%	45	%
Operating expenses:
Research and development	12	%	10	%	13	%	11	%
Sales and marketing	11	%	10	%	12	%	10	%
General and administrative	21	%	23	%	22	%	23	%
Total operating expenses	44	%	44	%	47	%	45	%
Operating income (loss)	2	%	1	%	(1)	%	1	%
Other expense, net
Interest expense, net	(5)	%	(6)	%	(4)	%	(6)	%
Other (expense) income, net	—	%	—	%	—	%	—	%
Total other expense, net	(5)	%	(6)	%	(4)	%	(6)	%
Loss before income taxes	(3)	%	(5)	%	(4)	%	(5)	%
Income tax provision	—	%	—	%	(6)	%	—	%
Net loss	(3)	%	(5)	%	(10)	%	(5)	%

(*) Columns may not foot due to rounding.

48

Management’s Discussion and Analysis

Comparison of the three months ended September 30, 2020 and 2021

Revenue

	Three months ended September 30,
	2020		2021		Change
	(Dollars in thousands)
Revenue:
CPaaS revenue	$	73,762	$	107,376	$	33,614	46	%
Other revenue	10,996		23,262		12,266		112	%
Total revenue	$	84,758	$	130,638	$	45,880	54	%

For the three months ended September 30, 2021, total revenue increased by $45.9 million, or 54%, and CPaaS revenue increased by $33.6 million, or 46%, compared with the same period in 2020. Usage and fees on our international platform contributed $26.9 million of this increase of total revenue and $26.0 million to CPaaS revenue. Excluding the higher amounts attributable to our international platform, revenue from all of our CPaaS offerings increased from the same period in 2020. This increase was led by growth in our phone number services and 911-enabled phone number services of $4.8 million and voice and messaging offerings of $2.4 million. Across our CPaaS offerings, higher usage pricing increased CPaaS revenue by $0.4 million with the remaining increase in CPaaS revenue driven by usage volume growth. These results also include a decrease of approximately $0.7 million in third quarter 2021 revenue from lost transaction volume and customer credits due to the previously disclosed DDoS attack. These changes in pricing and usage volume period over period were reflected in our dollar-based net retention rate of 108%. Revenue from new CPaaS customers also contributed $2.1 million, or 3%, to CPaaS revenue for 2021 compared with $6.4 million, or 12%, in the same period in 2020.

The increase in usage was also attributable to a 57% increase in the number of active CPaaS customer accounts, from 2,015 as of September 30, 2020 to 3,173 as of September 30, 2021. As a percentage of total revenue, CPaaS revenue decreased from 87% in 2020 to 82% in the same period in 2021.

Other revenue increased by $12.3 million, or 112%, in 2021 primarily due to indirect revenue, which increased by $11.7 million due to an increase in messaging surcharges and indirect voice revenue, and $0.9 million due to usage and fees on our international platform. Legacy revenue, as expected, continued to decline and decreased by $0.3 million, compared with the same period in 2020.

Cost of Revenue and Gross Margin

	Three months ended September 30,
	2020			2021			Change
	(Dollars in thousands)
Cost of revenue:
CPaaS cost of revenue	$	39,346		$	54,841		$	15,495	39	%
Other cost of revenue	6,181			17,554			11,373		184	%
Total cost of revenue	$	45,527		$	72,395		$	26,868	59	%
Gross profit	$	39,231		$	58,243		$	19,012	48	%
Gross margin:
CPaaS	47		%	49		%
Other	44		%	25		%
Total gross margin	46		%	45		%

49

Management’s Discussion and Analysis

For the three months ended September 30, 2021, total gross profit increased by $19.0 million, or 48%, compared with the same period in 2020, driven by higher revenue and improved operating leverage partially offset by unfavorable segment mix, which resulted in total gross margin of 45% for the three months ended September 30, 2021 compared with 46% in the corresponding period last year.

As a component of total gross margin, our CPaaS gross margin grew from 47% to 49% for the three months ended September 30, 2020 and 2021, respectively. Higher CPaaS gross margins arose from higher revenue, improved operating leverage and product mix. Our higher revenue drove correspondingly higher CPaaS cost of revenue for the three months ended September 30, 2021 of $15.5 million, or 39%, compared with the same period in 2020. CPaaS cost of revenue increased due to an increase in voice usage costs of $7.5 million, network costs of $6.6 million due to both network expansions and amortization expense, partially related to our international platform, and costs of phone numbers and 911 of $2.5 million, offset by a decline in cost of messaging of $1.1 million from an increase in messages used by customers, but a decreased cost per message.

Excluding depreciation, amortization and stock-based compensation of $2.3 million for the three months ended September 30, 2020 and $5.2 million for the three months ended September 30, 2021, CPaaS Non-GAAP gross margins were 50% and 54%, respectively, and total Non-GAAP gross margins were 49% for the three months ended September 30, 2020 and 2021. The increase Non-GAAP gross margins were driven by higher revenue, improved operating leverage, improved product mix and the inclusion of higher margin sales from our international platform.

For the three months ended September 30, 2021, other cost of revenue increased by $11.4 million compared with the same period in 2020. This was primarily due to increased indirect revenue and costs related to messaging surcharges, resulting in decreased Other gross margin from 44% to 25%.

Operating Expenses

	Three Months Ended September 30,
	2020		2021		Change
	(Dollars in thousands)
Research and development	$	10,232	$	13,359	$	3,127	31	%
Sales and marketing	9,001		13,592		4,591		51	%
General and administrative	18,134		30,354		12,220		67	%
Total operating expenses	$	37,367	$	57,305	$	19,938	53	%

As a percentage of revenue, total operating expenses for the three months ended September 30, 2020 and 2021 were 44% for both periods.

For the three months ended September 30, 2021, R&D expenses increased $3.1 million, or 31%, compared with the same period in 2020. This increase was due mainly to increased personnel costs of $2.4 million including the impact of growth in headcount as a result of the Acquisition.

For the three months ended September 30, 2021, sales and marketing expenses increased by $4.6 million, or 51%, compared with the period in 2020, primarily due to an increase in sales personnel costs of $2.8 million, which included the impact of growth in headcount as a result of the Acquisition, and an increase in non-headcount costs of $1.8 million.

For the three months ended September 30, 2021, general and administrative expenses increased by $12.2 million, or 67%, compared with the same period in 2020. This increase was due to higher personnel cost of $5.7 million due to the impact of growth in headcount as a result of the Acquisition, depreciation and amortization costs of $3.1 million, professional costs of $1.5 million, facilities costs of $0.9 million, and other costs of $1.0 million.

50

Management’s Discussion and Analysis

Interest Expense, Net

For the three months ended September 30, 2021, interest expense, net of interest income, increased by $3.5 million compared with the same period in 2020, due to a $2.9 million increase in interest expense related to the Convertible Notes and a $0.6 million decrease in interest income from the investment of follow-on equity offering proceeds. See Note 9, “Debt” to the condensed consolidated financial statements, for additional details.

Income Tax Benefit (Provision)

For the three months ended September 30, 2021, income tax expense increased by $0.3 million compared with the same period in 2020. The effective tax rate for the three months ended September 30, 2021 was (4.8)% compared with (0.4)% in the same period in 2020. The decrease in our effective tax rate is primarily due to acquisition of Voxbone in the fourth quarter of 2020, which has resulted in tax expense in additional jurisdictions without valuation allowances.

Comparison of the nine months ended September 30, 2020 and 2021

Revenue

	Nine months ended September 30,
	2020		2021		Change
	(Dollars in thousands)
Revenue:
CPaaS revenue	$	199,959	$	312,561	$	112,602	56	%
Other revenue	30,107		52,214		22,107		73	%
Total revenue	$	230,066	$	364,775	$	134,709	59	%

For the nine months ended September 30, 2021, total revenue increased by $134.7 million, or 59%, and CPaaS revenue increased by $112.6 million, or 56%, compared with the same period in 2020. Usage and fees on our international platform contributed $76.1 million of this increase to total revenue and $73.3 million to CPaaS revenue. Excluding the higher amounts attributable to our international platform, revenue from all of our CPaaS offerings increased from the same period in 2020 led by growth in our voice and messaging offerings of $20.8 million and phone number services and 911-enabled phone number services of $16.8 million. Across our CPaaS offerings, slightly higher usage pricing increased CPaaS revenue by $1.9 million with the remaining increase in CPaaS revenue driven by usage volume growth. These results also include a decrease of approximately $0.7 million in third quarter 2021 revenue from lost transaction volume and customer credits due to the previously disclosed DDoS attack. These changes in pricing and usage volume period over period were reflected in our dollar-based net retention rate of 116%. Revenue from new CPaaS customers contributed $9.5 million, or 13%, to CPaaS revenue for 2021 compared with $12.3 million, or 8%, in the same period in 2020.

The increase in usage was also attributable to a 57% increase in the number of active CPaaS customer accounts, from 2,015 as of September 30, 2020 to 3,173 as of September 30, 2021. As a percentage of total revenue, CPaaS revenue decreased from 87% to 86% from 2020 to the same period in 2021.

Other revenue increased by $22.1 million, or 73%, in 2021 primarily due to higher indirect revenue, which increased by $20.3 million due to an increase in messaging surcharges and indirect voice revenue, and $2.8 million due to usage and fees on our international platform. Legacy revenue, as expected, continued to decline and decreased by $1.0 million, compared with the same period in 2020.

51

Management’s Discussion and Analysis

Cost of Revenue and Gross Margin

	Nine months ended September 30,
	2020			2021			Change
	(Dollars in thousands)
Cost of revenue:
CPaaS cost of revenue	$	108,467		$	164,616		$	56,149	52	%
Other cost of revenue	15,428			35,166			19,738		128	%
Total cost of revenue	$	123,895		$	199,782		$	75,887	61	%
Gross profit	$	106,171		$	164,993		$	58,822	55	%
Gross margin:
CPaaS	46		%	47		%
Other	49		%	33		%
Total gross margin	46		%	45		%

For the nine months ended September 30, 2021, total gross profit increased by $58.8 million, or 55%, compared with the same period in 2020, driven by higher revenue and improved operating leverage partially offset by unfavorable segment mix, which resulted in total gross margin of 45% for the nine months ended September 30, 2021 compared with 46% in the corresponding period last year.

As a component of total gross margin, our CPaaS gross margin grew from 46% to 47% for the nine months ended September 30, 2020 and 2021, respectively. Higher CPaaS gross margins arose from higher revenue, improved operating leverage and product mix. Our higher revenue drove correspondingly higher CPaaS cost of revenue for the nine months ended September 30, 2021 of $56.1 million, or 52%, compared with the same period in 2020. CPaaS cost of revenue increased due to an increase in voice usage costs of $25.0 million, network costs of $19.1 million due to both network expansions and amortization expense, partially related to our international platform, costs of phone numbers and 911 of $7.7 million, and cost of messaging of $4.4 million from increased cost per message and the increase in messages used by customers.

Excluding depreciation, amortization and stock-based compensation of $7.1 million for the nine months ended September 30, 2020 and $15.6 million for the nine months ended September 30, 2021, CPaaS Non-GAAP gross margins were 49% and 52%, respectively, and total Non-GAAP gross margins were 49% and 50%, respectively, for the nine months ended September 30, 2020 and 2021. The increase Non-GAAP gross margins were driven by higher revenue, improved operating leverage, improved product mix and the inclusion of higher margin sales from our international platform.

For the nine months ended September 30, 2021, other cost of revenue increased by $19.7 million compared with the same period in 2020. This was primarily due to increased indirect revenue and costs related to messaging surcharges, resulting in decreased Other gross margin from 49% to 33%.

Operating Expenses

	Nine months ended September 30,
	2020		2021		Change
	(Dollars in thousands)
Research and development	$	29,316	$	39,509	$	10,193	35	%
Sales and marketing	27,073		38,168		11,095		41	%
General and administrative	51,070		85,481		34,411		67	%
Total operating expenses	$	107,459	$	163,158	$	55,699	52	%

52

Management’s Discussion and Analysis

As a percentage of revenue, total operating expenses for the nine months ended September 30, 2020 and 2021 decreased from 47% to 45%, respectively, as operating expenditures growth exceeded corresponding growth in revenue in 2021.

For the nine months ended September 30, 2021, R&D expenses increased by $10.2 million, or 35%, compared with the same period in 2020. This increase was due to increased personnel costs of $8.4 million including the impact of growth in headcount as a result of the Acquisition, and an increase in non-headcount costs of $1.8 million.

For the nine months ended September 30, 2021, sales and marketing expenses increased by $11.1 million, or 41%, compared with the period in 2020, primarily due to an increase in sales personnel costs of $7.5 million, which included the impact of growth in headcount as a result of the Acquisition, and an increase in non-headcount costs of $3.6 million.

For the nine months ended September 30, 2021, general and administrative expenses increased by $34.4 million, or 67%, compared with the same period in 2020. This increase was primarily due to higher personnel cost of $15.0 million resulting from the impact of growth in headcount as a result of the Acquisition, depreciation and amortization costs of $8.9 million, professional costs of $5.2 million, facilities costs of $2.7 million, and other costs of $2.6 million.

Interest Expense, Net

For the nine months ended September 30, 2021, interest expense, net of interest income, increased by $11.9 million compared with the same period in 2020, due to a $9.5 million increase in interest expense related to the Convertible Notes and a $2.2 million decrease in interest income from the investment of follow-on equity offering proceeds. See Note 9, “Debt” to the condensed consolidated financial statements, for additional details.

Income Tax Benefit (Provision)

For the nine months ended September 30, 2021, income tax expense decreased by $13.5 million compared with the same period in 2020. The effective tax rate for the nine months ended September 30, 2021 was (1.3)% compared with (134.2)% in the same period in 2020. The increase in our effective tax rate is primarily due to the change in judgment related to the realizability of certain deferred tax assets and the resulting valuation allowance.

Liquidity and Capital Resources

Our liquidity is provided by free cash flow driven by payments received from customers using our services, supplemented with convertible note offerings of $344.7 million and $217.0 million in February 2020 and March 2021, respectively. We believe that our cash and cash equivalents balances and the cash flows generated by our operations will be sufficient to satisfy our anticipated cash needs for working capital and capital expenditures for at least the next 12 months. However, our belief may prove to be incorrect, and we could utilize our available financial resources sooner than we currently expect. Our future capital requirements and the adequacy of available funds will depend on many factors, including those set forth in the section titled “Risk Factors.” We may be required to seek additional equity or debt financing in order to meet these future capital requirements. In the event that additional financing is required from outside sources, we may not be able to raise it on terms acceptable to us, or at all. If we are unable to raise additional capital when desired, our business, results of operations and financial condition would be adversely affected.

Statement of Cash Flows

The following table summarizes our cash flows for the periods indicated:

53

Management’s Discussion and Analysis

	Nine months ended September 30,
	2020		2021
	(In thousands)
Net cash provided by operating activities	$	11,331	$	23,688
Net cash (used in) provided by investing activities	(242,162)		11,681
Net cash provided by financing activities	347,102		213,961
Effect of exchange rate changes on cash, cash equivalents and restricted cash	48		291
Net increase in cash, cash equivalents, and restricted cash	$	116,319	$	249,621

Cash Flows from Operating Activities

For the nine months ended September 30, 2021, net cash provided by operating activities was $23.7 million, consisting of net loss of $19.2 million adjusted for non-cash items of $63.5 million, and offset by cash used by changes in operating assets and liabilities of $20.6 million.

Cash used in operating assets and liabilities included an increase in accounts receivable of $20.6 million, a decrease in operating right-of-use liability of $4.5 million, and an increase in prepaid expenses and other assets of $4.2 million. Offsetting these cash use items in assets and liabilities was an increase in accounts payable of $7.1 million, and an increase in accrued expenses and other liabilities of $1.6 million.

The non-cash items included depreciation and amortization expense of $27.5 million, amortization of debt discount and issuance costs of $19.5 million, stock-based compensation expenses of $11.6 million, right-of-use asset amortization of $4.3 million, loss on disposal of property and equipment of $0.4 million, and deferred tax expense of $0.3 million.

For the nine months ended September 30, 2020, net cash provided by operating activities was $11.3 million, consisting of net loss of $24.1 million adjusted for non-cash items of $46.2 million and offset by cash used by changes in operating assets and liabilities of $10.8 million.

Cash generated in operating assets and liabilities included an increase in accrued expenses and other liabilities of $8.7 million, and an increase in accounts payable of $2.9 million. Offsetting these cash generating items in assets and liabilities were an increase in accounts receivable of $16.2 million, a decrease in operating right-of-use liability of $4.0 million, and an increase in prepaid expenses and other assets of $2.2 million.

The non-cash items included deferred tax expense of $14.3 million, amortization of debt discount and issuance costs of $10.9 million, depreciation and amortization expense of $9.9 million, stock-based compensation expenses of $7.3 million, right-of-use asset amortization of $3.5 million, and loss on disposal of property and equipment of $0.3 million.

Cash Flows from Investing Activities

For the nine months ended September 30, 2021, net cash provided by investing activities was $11.7 million. Cash provided by investing activities was the proceeds from sales and maturities of other investments of $40.0 million, proceeds from the sale of land of $17.5 million, offset by the purchase of land of $30.0 million, purchase of property and equipment of $12.6 million and capitalized internally developed software costs of $3.2 million.

For the nine months ended September 30, 2020, net cash used in investing activities was $242.2 million from the purchase of other investments of $230.8 million, the purchase of property and equipment of $9.5 million and capitalized internally developed software costs of $1.9 million.

Cash Flows from Financing Activities

54

Management’s Discussion and Analysis

For the nine months ended September 30, 2021, net cash provided by financing activities was $214.0 million consisting primarily of $250.0 million in proceeds from the issuance of the 2028 Convertible Notes and $0.9 million in proceeds from the issuance of stock options, partially offset by $25.5 million in the purchase of the 2028 Capped Calls, $7.5 million in payments of debt issuance cost, and $3.7 million in value of equity awards withheld for tax liabilities.

For the nine months ended September 30, 2020, net cash provided by financing activities was $347.1 million consisting primarily of $400.0 million in proceeds from issuance of the 2026 Convertible Notes and $3.9 million in proceeds from the issuance of stock options, partially offset by $43.3 million in the purchase of the Capped Calls, $12.0 million in payments of debt issuance costs and $1.5 million in value of equity awards withheld for tax liabilities.

Debt

On May 25, 2021, we terminated the Credit and Security Agreement, dated as of November 4, 2016 as amended and restated as of March 1, 2019, among the Company, KeyBank National Association, and KeyBanc Capital Markets Inc. (the “Credit Agreement”). The Credit Agreement provided for a secured $25.0 million revolving credit facility. As of May 25, 2021, no borrowings were outstanding under the Credit Agreement. As of September 30, 2021, we had no outstanding unamortized loan fees for the Credit Agreement.

On March 16, 2021, we issued $250.0 million aggregate principal amount of the 2028 Convertible Notes in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act. The interest on the 2028 Convertible Notes is payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2021.

The 2028 Convertible Notes may bear special interest under specified circumstances relating to our failure to comply with its reporting obligations under the indenture governing the 2028 Convertible Notes (the “2028 Indenture”) or if the 2028 Convertible Notes are not freely tradeable as required by the 2028 Indenture. The 2028 Convertible Notes will mature on April 1, 2028, unless earlier repurchased, redeemed by us, or converted pursuant to their terms. The total net proceeds from the 2028 Convertible Notes, after deducting initial purchaser discounts, costs related to the 2028 Capped Calls, and debt issuance costs, paid or payable by us, were approximately $217.0 million.

55

Management’s Discussion and Analysis

Contractual Obligations and Other Commitments

The following table summarizes our non-cancellable contractual obligations as of September 30, 2021:

	Total		Less than 1 year		1 to 3 Years		3 to 5 Years		More than 5 years
	(In thousands)
Operating leases (1)	$	17,733	$	6,701	$	9,728	$	1,304	$	—
Finance leases (1)	434		201		209		24		—
Leases not yet commenced (2)	495,708		—		29,496		42,901		423,311
Convertible Notes (3)	650,000		—		—		400,000		250,000
Purchase obligations (4)	17,737		12,199		3,961		1,575		2
Total	$	1,181,612	$	19,101	$	43,394	$	445,804	$	673,313

________________________

(1) Operating and finance leases represent total future minimum rent payments under non-cancellable lease agreements.

(2) See Note 13, “Commitments and Contingencies” to the condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q, for a discussion of the lease anticipated to commence in May 2023 for our new corporate headquarters.

(3) See Note 9, “Debt” to the condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q, for a discussion of our 2026 Convertible Notes and our 2028 Convertible Notes.

(4) Purchase obligations represent total non-cancelable purchase commitments and future minimum payments under contracts to various service providers, excluding agreements that are cancellable without penalty.

Off-Balance Sheet Arrangements

We do not have any holdings in variable interest entities. With the acquisition of Voxbone, we have off-balance sheet agreements for short-term office and automobile leases in the amount of $448 and $2, respectively, ending prior to June 30, 2022.

Critical Accounting Policies and Significant Judgments and Estimates

Our condensed consolidated financial statements are prepared in accordance with GAAP. The preparation of these financial statements requires our management to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenue, costs, and expenses and related disclosures. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these judgments and estimates under different assumptions or conditions and any such differences may be material.

We believe that the assumptions and estimates associated with revenue recognition and deferred revenue, stock-based compensation, the valuation of goodwill and intangible assets, internal-use software development costs, income taxes and other contingencies have the greatest potential impact on our condensed consolidated financial statements. Therefore, we consider these to be our critical accounting policies and estimates.

There have been no material changes to our critical accounting policies and significant judgments and estimates as compared to the critical accounting policies and significant judgments and estimates disclosed in our Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on March 1, 2021.

56

Recently Issued Accounting Guidance

See Note 2, “Summary of Significant Accounting Policies” to the condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q, for a summary of recently adopted accounting standards and recent accounting pronouncements not yet adopted.

57

Item 3. Quantitative and Qualitative Disclosures about Market Risk

We are exposed to certain market risks in the ordinary course of our business. Market risk represents the risk of loss that may impact our financial position due to adverse changes in financial market prices and rates. Our market risk exposure is primarily the result of fluctuations in interest rates and, to a lesser extent, foreign currency rates and inflation.

Interest Rate Risk

Our primary exposure to market risk relates to interest rate changes. We had cash and cash equivalents of $321.8 million as of September 30, 2021, which were held for working capital purposes. Our cash and cash equivalents are comprised primarily of interest bearing checking accounts, money market accounts and time deposits.

Such interest-earning instruments carry a degree of interest rate risk. To date, fluctuations in interest income have not been significant. The primary objective of our investment activities is to preserve principal while maximizing income without significantly increasing risk. We do not enter into investments for trading or speculative purposes and have not used any derivative financial instruments to manage our interest rate risk exposure. Due to the short-term nature of our investments, we have not been exposed to, nor do we anticipate being exposed to, material risks due to changes in interest rates.

In February 2020 and March 2021, we issued $400.0 million and $250.0 million aggregate principal amount of the 2026 Convertible Notes and the 2028 Convertible Notes, respectively. As the Convertible Notes have a fixed annual interest rate, we have no financial or economic interest exposure associated with changes in interest rates. However, the fair value of fixed rate debt instruments fluctuates when interest rates change. Additionally, the fair value can be affected when the market price of our common stock fluctuates. We carry the Convertible Notes at face value less unamortized discount on our balance sheet, and we present the fair value for required disclosure purposes only.

Foreign Currency Risk

The functional currencies of our foreign subsidiaries are the respective local currencies of the jurisdictions in which they operate, which are primarily the Euro and the British Pound. Approximately 12% of our total revenue for the year ended September 30, 2021 was generated outside the United States. The majority of our revenues and operating expenses are denominated in U.S. dollars, and therefore are not currently subject to significant foreign currency risk. Our subsidiaries remeasure monetary assets and liabilities at period-end exchange rates, while non-monetary items are remeasured at historical rates. Revenue and expense accounts are remeasured at the average exchange rate in effect during the year. If there is a change in foreign currency exchange rates, the conversion of our foreign subsidiaries’ financial statements into U.S. dollars would result in a realized gain or loss, which is recorded in other expense, net in our condensed consolidated statements of operations. We do not currently engage in any hedging activity to reduce our potential exposure to currency fluctuations, although we may choose to do so in the future. To the extent the U.S. dollar weakens against foreign currencies, the translation of these foreign currencies result in increased revenue and operating expenses for our non-U.S. operations. Similarly, our revenue and operating expenses for our non-U.S. operations decrease if the U.S. dollar strengthens against foreign currencies.

Inflation

We do not believe inflation has had a material effect on our business, financial condition or results of operations. We continue to monitor the impact of inflation in order to minimize its effects through pricing strategies, productivity improvements and cost reductions. If our costs were to become subject to significant inflationary pressures, we may not be able to fully offset such higher costs through price increases. Our inability or failure to do so could harm our business, financial condition and results of operations.

58

Item 4. Controls and Procedures

Evaluation of disclosure controls and procedures

Our management, with the participation of our Chief Executive Officer and our Chief Financial Officer, have evaluated our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this Quarterly Report on Form 10-Q. Based on that evaluation, our Chief Executive Officer and our Chief Financial Officer have concluded that, as of the end of the period covered by this Quarterly Report on Form 10-Q, our disclosure controls and procedures are designed at a reasonable assurance level and are effective to provide reasonable assurance that information we are required to disclose in reports that we file or submit under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in SEC rules and forms, and that such information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in internal control over financial reporting

There were no changes in our internal control over financial reporting identified in connection with the evaluation required by Rule 13a-15(d) and 15d-15(d) of the Exchange Act during the quarter ended September 30, 2021, that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Inherent limitation on the effectiveness of internal control

The effectiveness of any system of internal control over financial reporting, including ours, is subject to inherent limitations, including the exercise of judgment in designing, implementing, operating, and evaluating the controls and procedures, and the inability to eliminate misconduct completely. Accordingly, any system of internal control over financial reporting, including ours, no matter how well designed and operated, can only provide reasonable, not absolute assurances. In addition, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate. We intend to continue to monitor and upgrade our internal controls as necessary or appropriate for our business, but cannot assure you that such improvements will be sufficient to provide us with effective internal control over financial reporting.

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PART II - OTHER INFORMATION

Item 1. Legal Proceedings

Phone Recovery Services, LLC (“Phone Recovery Services”) and Phone Administrative Services, Inc. (“Phone Administrative Services”) acting or purporting to act on behalf of applicable jurisdictions, or the applicable county or city itself, have filed multiple lawsuits against us and/or one of our subsidiaries alleging that we failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services.

The following county or municipal governments have named us in lawsuits associated with the collection and remittance of 911 taxes and surcharges that remain unresolved: the City and County of San Francisco, California (the “California Case”); Cook County and Kane County, Illinois; City of Chicago, Illinois; the State of Illinois (collectively, the “Illinois Case”); the State of New York (the “New York Case”); Allegheny County, Pennsylvania (the “Pennsylvania Case”); and the State of Rhode Island (the “Rhode Island Case”). The complaints allege that we failed to bill, collect and remit certain taxes and surcharges associated with 911 service pursuant to applicable laws. The California Case was originally filed under seal in January 2020 and was served on Bandwidth in February 2021. We filed a motion to dismiss the California Case on May 5, 2021. The motion to dismiss was granted, with leave to amend, on August 18, 2021. The plaintiff filed an amended complaint in the California Case on October 15, 2021. The Illinois Case was dismissed by the trial court in December 2016, but returned to the trial court following an appeal. The plaintiffs’ amended complaint in the Illinois Case was filed on August 12, 2019. We filed a motion to dismiss the Illinois Case on September 26, 2019. The New York Case originally was filed under seal in 2014, amended and filed under seal in 2018, and made available publicly on October 25, 2019. On May 19, 2021, the plaintiff filed a Fourth Amended Complaint in the New York Case. We filed a motion to dismiss the New York Case on June 17, 2021. The Rhode Island Case originally was filed under seal in 2014 and was made available publicly in 2015. Our response to the complaint in the Rhode Island Case has been on hold since 2015, pending the filing of an amended complaint. The Pennsylvania Case is stayed pending the outcome of a related proceeding before the Federal Communications Commission (“FCC”) that is currently the subject of an appeal.

On November 30, 2020, we were named as a defendant in a Second Amended Class Action Complaint in a putative class action captioned Diana Mey v. All Access Telecom, Inc., et al. pending in the United States District Court, Northern District of West Virginia relating to the alleged failure to block unsolicited phone calls to the plaintiff and putative class members. We filed a motion to dismiss the action on February 3, 2021. On April 23, 2021, that motion was denied. On May 21, 2021, the plaintiff filed a Third Amended Complaint. We filed a motion to dismiss the Third Amended Complaint on June 4, 2021, and a motion seeking primary jurisdiction referral to the FCC on June 26, 2021. The motions were denied on September 7, 2021, and September 30, 2021, respectively. We filed an answer to the Third Amended Complaint on September 21, 2021.

We intend to vigorously defend these lawsuits and believe we have meritorious defenses to each. However, litigation is inherently uncertain, and any judgment or injunctive relief entered against us or any adverse settlement could negatively affect our business, results of operations and financial condition.

In addition to the litigation discussed above, from time to time, we may be subject to legal actions and claims in the ordinary course of business. We have received, and may in the future continue to receive, claims from third parties relating to number management, and claims asserting, among other things, infringement of their intellectual property rights. Future litigation may be necessary to defend ourselves, our partners and our customers by determining the scope, enforceability and validity of third-party proprietary rights, or to establish our proprietary rights. The results of any current or future litigation cannot be predicted with certainty, and regardless of the outcome, litigation can have an adverse impact on us because of defense and settlement costs, diversion of management resources, and other factors.

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Item 1A. Risk Factors

A description of the risks and uncertainties associated with our business is set forth below. You should carefully consider the risks and uncertainties described below, together with all of the other information in this Quarterly Report on Form 10-Q, including the section titled “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and our condensed consolidated financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q. The risks and uncertainties described below may not be the only ones we face. If any of the risks actually occur, our business, financial condition, results of operations and prospects could be materially and adversely affected. In that event, the market price of our Class A common stock could decline.

Risk Factors Summary

The following is a summary of the principal risks that could adversely affect our business, results of operations and financial condition.

Risks Related to Our Business

•The success of our growth and expansion plans depends on a number of factors that are beyond our control.

•The recent COVID-19 pandemic and the global attempt to contain it may harm our business.

•The market in which we participate is highly competitive, and we may not compete effectively.

•We may not be able to attract new customers in a cost-effective manner.

•The market for some of our services is new and unproven.

•We must increase the network traffic and revenue to meet our growth targets.

•Our business depends on customers increasing their use of our services.

•We may not be able to increase the revenue that we derive from enterprises.

•We may not be able to develop service enhancements or new services that achieve market acceptance.

•We have grown rapidly, expect our growth to continue, and may not be able to manage the growth effectively.

•Our pricing and billing systems are complex, and errors could adversely affect our revenue and profits.

•We must continue to develop effective systems to execute customer orders and to provide and bill for services.

•We may not be able to maintain and enhance our brand and increase market awareness.

•Failure to deliver high-quality support may adversely affect our customer relationships.

•We operate internationally, which exposes us to significant risks.

•Our revenue is concentrated in a limited number of enterprise customers.

•Attacks on or breaches of our networks or systems, or on those of third parties on which we rely, including denial-of-service, ransomware and other cyberattacks, may result in disruption to our services, which could harm our business.

•We are currently subject to litigation related to taxes and charges associated with our provision of 911 services.

•Customer misuse of our services and software could result in litigation and harm our business.

•The communications industry faces significant regulatory uncertainties.

•The effects of increased regulation of IP-based service providers are unknown.

•We must obtain and maintain permits and licenses to operate our network.

•If we violate regulatory requirements that apply to our operations, we may not be able to conduct our business.

•The FCC’s repeal of its Network Neutrality Rules could harm our business.

•Any failure to comply with privacy and data security obligations may harm our business.

•Our business is subject to complex and evolving foreign laws regarding privacy and data protection.

•Our business may be harmed if we cannot obtain, retain and distribute local or toll-free numbers.

•Foreign currency exchange rate fluctuations may harm our business.

•We may be exposed to liabilities under anti-corruption, export control and economic sanction regulations.

•Third party intellectual property rights could prevent us from using technologies needed to provide our services.

•Our use of open source software could negatively affect our ability to sell our services and subject us to litigation.

•Indemnity provisions in various agreements potentially expose us to substantial liability.

•Our use of personal information subjects us to evolving governmental laws and other legal obligations.

•We may fail to protect our internally developed systems, technology and software and our intellectual property.

•We are subject to litigation in the ordinary course of business, which may harm our business.

•We may be liable for the information that content owners or distributors distribute over our network.

•Third parties may use our services to commit fraud or steal our services.

•We may lose customers if our platform or network fails or is disrupted.

•Defects or errors in our services could harm our business.

•If our emergency services do not function properly, we may be exposed to significant liability.

•Termination of relationships with key suppliers could cause delay and additional costs.

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•Our customer churn rate may increase.

•The prices for some of our services have decreased in the past and may do so again in the future.

•The need to obtain additional IP circuits or interconnect with other networks could increases our costs.

•The loss of any member of our senior management team or key employees could harm our business.

•If we are unable to hire, retain and motivate qualified personnel, our business will suffer.

•We could be subject to liability for historic and future sales, use and similar taxes.

•We may be subject to significant tax-related liabilities and indemnity obligations if the Spin-Off (as defined below) is taxable.

•Our estimates or judgments relating to our critical accounting policies may prove to be incorrect.

•We may be unable to maintain an effective system of disclosure controls and internal control over financial reporting.

•If our goodwill or intangible assets become impaired, we may be required to record a significant charge.

•Natural disasters, pandemics, power outages, terrorist attacks and similar events could harm our business.

•We may acquire other businesses, which may divert our management’s attention and impact our stock price.

Risks Related to the Acquisition of Voxbone

•The Voxbone acquisition may not yield the synergies and other benefits that we anticipated.

•Purchase price accounting for the Voxbone acquisition requires estimates that could change.

Risks Related to the Convertible Notes and Our Indebtedness

•Servicing our future indebtedness may require a significant amount of cash, which we may not have.

•We may not have the ability to raise the funds necessary for cash settlement of the Convertible Notes.

•The accounting method for our Convertible Notes could have a material effect on our financial results.

•The capped call transactions may affect the value of the Convertible Notes and our Class A common stock.

Risks Related to Ownership of Our Class A Common Stock

•The trading price of our Class A common stock may be volatile and you could lose all or part of your investment.

•Substantial future sales of shares of our Class A common stock could cause the price of our Class A to decline.

•Our dual class capital structure concentrates voting control.

•We cannot predict the impact our capital structure may have on our stock price.

•Our stock price and trading volume could decline if securities or industry analysts stop covering our Class A Common Stock.

•Anti-takeover provisions in our organizational documents and Delaware law, could impair a takeover attempt.

•Our certificate of incorporation and bylaws include super-majority voting provisions.

•Our bylaws provide that Delaware will be the sole and exclusive forum for certain stockholder litigation.

•We may need additional capital in the future and such capital may be limited or unavailable.

•We do not intend to pay dividends for the foreseeable future.

The following is a more complete discussion of the material risks facing our business.

Risks Related to Our Business

The success of our growth and expansion plans depends on a number of factors that are beyond our control.

We have grown our business considerably over the last several years. We cannot guarantee that we will be able to maintain our growth or that we will choose to target the same pace of growth in the future. Our success in achieving continued growth depends upon several factors including:

•our ability to hire and retain qualified and effective personnel, including but not limited to those with the expertise required to develop and maintain our service offerings, to sell those offerings and to operate our business effectively;

•the overall economic health of new and existing markets;

•the number and effectiveness of competitors;

•the pricing structure under which we will be able to purchase services required to serve our customers;

•our ability to introduce new product offerings;

•the availability to us of technologies needed to remain competitive;

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•federal, state and international regulatory conditions, including the maintenance of regulation that protects us from unfair business practices by traditional network service providers or others with greater market power who have relationships with us as both competitors and suppliers; and

•changes in industry standards, laws, regulations, or regulatory enforcement in the United States and internationally.

The ongoing COVID-19 pandemic and the global attempt to contain it may harm our business and results of operations.

The global spread of novel coronavirus disease (“COVID-19”) and the various measures to contain its effects have created significant volatility, uncertainty, and economic disruption worldwide. The pandemic has severely curtailed travel, and in certain locations many of our employees currently work from home, which disrupts how we typically operate. We are currently experiencing voluntary attrition at a rate that exceeds our historical average. We may also experience slowdowns in customer payments, increased customer churn, and reduced usage of our communications platform by some customers.

The extent to which the COVID-19 pandemic impacts our business, operations and financial results will depend on numerous evolving factors that we may not be able to accurately predict. These include: the duration and scope of the pandemic; governmental, business and individual actions that have been and continue to be taken in response to the pandemic; the effect on our customers, customer demand for our services, and our customers’ ability to pay for our services; disruptions to or restrictions on our employees’ ability to work and travel; and any effects of the pandemic on our customers, suppliers and vendors. If we need to access the capital markets and other sources of liquidity, there can be no assurance that financing may be available on attractive terms, if at all.

The market in which we participate is highly competitive, and if we do not compete effectively, our business, results of operations and financial condition could be harmed.

The market for cloud communications is rapidly evolving, significantly fragmented and highly competitive, with relatively low barriers to entry in some segments. The principal competitive factors in our market include completeness of offering, credibility with enterprises and developers, global reach, ease of integration and programmability, product features, platform scalability, reliability, deliverability, security and performance, brand awareness and reputation, the strength of sales and marketing efforts and customer support, as well as the cost of deploying and using our services. Our competitors fall into two primary categories:

•CPaaS companies that offer a narrower set of software APIs, less robust customer support and fewer other features, while relying on third-party networks and physical infrastructure; and

•network service providers that offer limited developer functionality on top of their own networks and physical infrastructure.

Some of our competitors and potential competitors are larger and have greater name recognition, longer operating histories, more established customer relationships, a larger global reach, larger budgets and significantly greater resources than we do. In addition, they have the operating flexibility to bundle competing products and services at little or no incremental cost, including offering them at a lower price as part of a larger sales transaction. As a result, our competitors may be able to respond more quickly and effectively than we can to new or changing opportunities, technologies, standards or customer requirements. In addition, some competitors may offer services that address one or a limited number of functions at lower prices, with greater depth than our services or in different geographies. Our current and potential competitors may develop and market new services with comparable functionality to our services, and this could lead to us having to decrease prices in order to remain competitive. In addition, some of our competitors have lower list prices than us, which may be attractive to certain customers even if those services have different or lesser functionality. If we are unable to maintain our current pricing due to competitive pressures, our margins will be reduced and our business, results of operations and financial condition would be adversely affected. Customers utilize our services in many ways and use varying levels of functionality that our services offer or are capable of supporting or enabling within their applications. Customers that use many of the features of our services or use our services to support or enable core functionality for their applications may have difficulty or find it impractical to replace our services with a competitor’s

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services, while customers that use only limited functionality may be able to more easily replace our services with competitive offerings.

With the introduction of new services and new market entrants, we expect competition to intensify in the future. In addition, some of our customers choose to use our services and our competitors’ services at the same time. Moreover, as we expand the scope of our services, we may face additional competition. Further, customers and consumers may choose to adopt other forms of electronic communications or alternative communication platforms, including developing necessary networks and platforms in-house.

Furthermore, if our competitors were to merge such that the combined entity would be able to compete fully with our service offering, then our business, results of operations and financial condition may be adversely affected. If one or more of our competitors were to merge or partner with another of our competitors, the change in the competitive landscape could also adversely affect our ability to compete effectively. In addition, pricing pressures and increased competition generally could result in reduced revenue, reduced margins, increased losses or the failure of our services to achieve or maintain widespread market acceptance, any of which could harm our business, results of operations and financial condition.

Our current and potential competitors have developed and may develop in the future product solutions that are available internationally as well as domestically. To the extent that customers seek product solutions that include support and scaling internationally, they may choose to use other service providers to fill their communication service needs before we can fully develop and integrate our international offerings. Each of these factors could lead to reduced revenue, slower growth and lower brand name recognition amongst our industry competitors, any or all of which could harm our business, results of operations and financial condition.

If we are unable to attract new customers in a cost-effective manner, then our business, results of operations and financial condition would be adversely affected.

In order to grow our business, we must continue to attract new customers in a cost-effective manner. We use a variety of marketing channels to promote our services and our communications platform, and we periodically adjust the mix of our marketing programs. If the costs of the marketing channels we use increase dramatically, then we may choose to use alternative and less expensive channels, which may not be as effective as the channels we currently use. As we add to or change the mix of our marketing strategies, we may need to expand into more expensive channels than those we are currently in, which could adversely affect our business, results of operations and financial condition. We also cannot predict the extent to which COVID-19 may cause us to adjust how we promote our services, including adjustments to our use of marketing channels. We will incur marketing expenses before we are able to recognize any revenue that the marketing initiatives may generate, and these expenses may not result in increased revenue or brand awareness. We have made in the past, and may make in the future, significant expenditures and investments in new marketing campaigns. We cannot assure you that any new investments in sales and marketing, including any increased focus on enterprise sales efforts, will lead to the cost-effective acquisition of additional customers or increased sales or that our sales and marketing efficiency will be consistent with prior periods. If we are unable to maintain effective marketing programs, then our ability to attract new customers could be materially and adversely affected, our advertising and marketing expenses could increase substantially and our results of operations may suffer.

The market for some of our services and platform is new and unproven, may decline or experience limited growth and is dependent in part on enterprises and developers continuing to adopt our platform and use our services.

We have been developing and providing a cloud-based platform that enables developers and organizations to integrate voice and messaging communications capabilities into their software applications. This market is relatively new and unproven and is subject to a number of risks and uncertainties. We believe that our future success will depend in large part on the growth, if any, of this market. For example, the utilization of software APIs by developers and organizations to build communications functionality into their applications is still relatively new, and developers and organizations may not recognize the need for, or benefits of, our services and platform. Moreover, if they do not recognize the need for and benefits of our services and platform, they may decide to adopt alternative services and/or develop the necessary services in-house to satisfy their business needs. In order to grow our business and expand our market position, we intend to focus on educating enterprise customers about the benefits of our services and platform, expanding the functionality of our

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services and bringing new technologies to market to increase market acceptance and use of our platform. Our ability to expand the market that our services and platform address depends upon a number of factors, including the cost, performance and perceived value associated with such services and platform. The market for our services and platform could fail to grow significantly or there could be a reduction in demand for our services and platform as a result of a lack of customer acceptance, technological changes or challenges, our lack of success at introducing new product offerings, competing services and platforms, decreases in spending by current and prospective customers, weakening economic conditions, geopolitical developments, global pandemics, adverse regulatory developments or other causes. If our market does not experience significant growth or demand for our services and platform decreases, then our business, results of operations and financial condition could be adversely affected.

We must increase the network traffic and resulting revenue from the services that we offer to realize our targets for anticipated revenue growth, cash flow and operating performance.

We must increase the network traffic and resulting revenue from our inbound and outbound voice calling, messaging, emergency voice functions, telephone numbers and related services at acceptable margins to realize our targets for anticipated revenue growth, cash flow and operating performance. If:

•we do not maintain or improve our current relationships with existing key customers;

•we are not able to expand the available capacity on our network to meet our customers’ demands in a timely manner;

•we do not develop new large enterprise customers; or

•our customers determine to obtain these services from either their own network or from one of our competitors,

then we may be unable to increase or maintain our revenue at acceptable margins.

Our business depends on customers increasing their use of our services and any loss of customers or decline in their use of our services could materially and adversely affect our business, results of operations and financial condition.

Our ability to grow and generate incremental revenue depends, in part, on our ability to maintain and grow our relationships with existing customers and to have them increase their usage of our communications platform. If our customers do not increase their use of our services, then our revenue may decline and our results of operations may be harmed. Customers generally are charged based on the usage of our services. Most of our customers do not have long-term contractual financial commitments to us and, therefore, most of our customers may reduce or cease their use of our services at any time without penalty or termination charges. We cannot accurately predict customers’ usage levels and the loss of customers or reductions in their usage levels of our services may each have a negative impact on our business, results of operations and financial condition and may cause our dollar-based net retention rate to decline in the future if our customers are not satisfied with our services. If a significant number of customers cease using, or reduce their usage of, our services, then we may be required to spend significantly more on sales and marketing than we currently plan to spend in order to maintain or increase revenue from customers. Such additional sales and marketing expenditures could adversely affect our business, results of operations and financial condition.

If we are unable to increase the revenue that we derive from enterprises, our business, results of operations and financial condition may be adversely affected.

We currently generate all of our revenue from enterprise customers. Our ability to expand our sales to enterprise customers will depend, in part, on our ability to effectively organize, focus and train our sales and marketing personnel and to attract and retain sales personnel with experience selling to enterprises. We believe that there is significant competition for experienced sales professionals with the skills and technical knowledge that we require. Our ability to achieve significant revenue growth in the future will depend, in part, on our ability to recruit, train and retain a sufficient number of experienced sales professionals, particularly those with experience selling to enterprises. In addition, even if we are successful in hiring qualified sales personnel, new hires require significant training and experience before they achieve full productivity, particularly for sales efforts targeted at enterprises and new territories. Our recent hires and planned

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hires may not become as productive as quickly as we expect and we may be unable to hire or retain sufficient numbers of qualified individuals in the future in the markets where we do business.

With respect to enterprise customers, the decision to adopt our services may require the approval of multiple technical and business decision makers, including security, compliance, procurement, operations and IT. In addition, while enterprise customers may quickly deploy our services on a limited basis, before they will commit to deploying our services at scale, they often require extensive education about our services and significant customer support time, engage in protracted pricing negotiations and seek to secure readily available development resources. In addition, sales cycles for enterprises are inherently complex and lengthy, and some enterprise customers may not generate revenue that justifies the cost to obtain such customers. In addition, these complex and resource-intensive sales efforts could place additional strain on our limited product and engineering resources. Further, enterprises, including some of our customers, may choose to develop their own solutions that do not include our services. They also may demand reductions in pricing as their usage of our services increases, which could have an adverse impact on our gross margin. Our efforts to sell to these potential customers may not be successful. If we are unable to increase the revenue that we derive from enterprises, then our business, results of operations and financial condition may be adversely affected.

If we do not develop enhancements to our services and introduce new services that achieve market acceptance, our business, results of operations and financial condition could be adversely affected.

Our ability to attract new customers and increase revenue from existing customers depends in part on our ability to enhance and improve our existing services, increase adoption and usage of our services and introduce new services. The success of any enhancements or new services depends on several factors, including timely completion, adequate quality testing, actual performance quality, market-accepted pricing levels and overall market acceptance. Enhancements and new services that we develop may not be introduced in a timely or cost-effective manner, may contain errors or defects, may have interoperability difficulties with our communications platform or other services or may not achieve the broad market acceptance necessary to generate significant revenue. We also must integrate with a variety of network, hardware, mobile and software platforms and technologies, which requires us to enhance and modify our products and our communications platform to adapt to changes and innovation in these technologies. Wireline and wireless telephone providers or cell-phone operating system providers such as Apple and Google have developed and may in the future develop new applications, functions or technologies intended to filter illegal robocalls or other unwanted phone calls or messages. Such applications, functions or technologies may inadvertently filter legal and desired calls or messages to or from our customers. In certain instances, we may need to update our services and technology to work with these applications, functions or technologies. Any failure to operate effectively with evolving or new technologies could reduce the demand for our services. If we cannot respond to these changes cost-effectively, our services may become less marketable and less competitive or obsolete, and our business, results of operations and financial condition could be adversely affected. To the extent that upgrades of existing products, services and technology are required for the introduction of new services, the success of these upgrades also may be dependent on reaching mutually acceptable terms with vendors and on vendors meeting their obligations in a timely manner.

Furthermore, our ability to increase the usage of our services depends, in part, on the development of new use cases for our services, which may be outside of our control. Our ability to generate usage of additional services by our customers may also require increasingly sophisticated and more costly sales efforts and result in a longer sales cycle. If we are unable to successfully enhance our existing services to meet evolving customer requirements, increase adoption and usage of our services or develop new services, or if our efforts to increase the usage of our services are more expensive than we expect, then our business, results of operations and financial condition would be adversely affected.

We have experienced rapid growth and expect our growth to continue, and if we fail to effectively manage our growth, then our business, results of operations and financial condition could be adversely affected.

We have experienced substantial growth in our business since inception, which has placed and may continue to place significant demands on our corporate culture, operational infrastructure and management. We believe that our corporate culture has been a critical component of our success. We have invested substantial time and resources in building our team and nurturing our culture. As we expand our business, grow internationally and mature as a public company, we may find it difficult to maintain our corporate culture while managing this growth, particularly if governmental responses to COVID-19 require that many of our employees work remotely for a prolonged period of time.

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Any failure to manage our anticipated growth and organizational changes in a manner that preserves the key aspects of our culture could hurt our chance for future success, including our ability to recruit and retain personnel, and effectively focus on and pursue our corporate objectives. This, in turn, could adversely affect our business, results of operations and financial condition.

In addition, as we have rapidly grown, our organizational structure has become more complex. In order to manage these increasing complexities, we will need to continue to scale and adapt our operational, financial and management controls, as well as our reporting systems and procedures. The expansion of our systems and infrastructure will require us to commit substantial financial, operational and management resources before our revenue increases and without any assurances that our revenue will increase.

Finally, if this growth continues, it could strain our ability to maintain reliable service levels for our customers. If we fail to achieve the necessary level of efficiency in our organization as we grow, then our business, results of operations and financial condition could be adversely affected.

Our pricing and billing systems are complex and errors could adversely affect our revenue and profits.

Our pricing and billing efforts are complex to develop and challenging to implement. To be profitable, we must have accurate and complete information about the costs associated with voice and messaging, and properly incorporate such information into our pricing model. Our pricing model must also reflect accurate and current information about the market for our services, including the pricing of competitive alternatives for our services, as well as reliable forecasts of traffic volume. We may determine pricing for our services based on data that is outdated or otherwise flawed. Even if we have complete and accurate market information, we may not set prices to optimize both revenue and profitability. If we price our services too high, the amount of traffic that our customers may route to our network may decrease and accordingly our revenue may decline. If we price our services too low, our margins may be adversely affected, which will reduce our ability to achieve and maintain profitability.

Additionally, we rely on third parties to provide us with key software and services for our billing. If these third parties cease to provide those services to us for any reason, or fail to perform billing services accurately and completely, we may not be able to deliver accurate invoices promptly. Delays in invoicing can lead to delays in revenue recognition, and inaccuracies in our billing could result in lost revenue. If we fail to adapt quickly and effectively to changes affecting our costs, pricing and billing, our profitability and cash flow will be adversely affected.

We must continue to develop effective business support systems to implement customer orders and to provide and bill for services.

We depend on our ability to continue to develop effective business support systems. This complicated undertaking requires significant resources and expertise and support from third-party vendors. Following the development of the business support systems, the data migration must be completed for the full benefit of the systems to be realized. Business support systems are needed for:

•quoting, accepting and inputting customer orders for services;

•provisioning, installing and delivering services;

•providing customers with direct access to the information systems included in our communications platform so that they can manage the services they purchase from us, generally through web-based customer portals; and

•billing for services.

Because our business provides for continued rapid growth in the number of customers that we serve, the volume of services offered, as well as the integration of any acquired companies’ business support systems, we must continue to develop our business support systems on a schedule sufficient to meet proposed milestone dates. If we fail to develop effective business support systems or complete the data migration into these systems, it could materially adversely affect our ability to implement our business plans, realize anticipated benefits from our acquisitions, if any, and meet our financial goals and objectives.

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If we are not able to maintain and enhance our brand and increase market awareness of our company and services, then our business, results of operations and financial condition may be adversely affected.

We believe that maintaining and enhancing our brand identity and increasing market awareness of our company and services are critical to achieving widespread acceptance of our company and our communications platform, as well as to strengthen our relationships with our existing customers and to our ability to attract new customers. The successful promotion of our brand will depend largely on our continued marketing efforts, our ability to continue to offer high quality services and our ability to successfully differentiate our services from competing products and services. Our brand promotion activities may not be successful or yield increased revenue. In addition, independent industry analysts often provide reviews of our services and competing products and services, which may significantly influence the perception of our services in the marketplace. If these reviews are negative or not as strong as reviews of our competitors’ services, then our brand may be harmed.

From time to time, our customers have complained about our services, such as complaints about our pricing and customer support. Additionally, we sometimes experience customer complaints relating to disruption to or outage of our services, such as we experienced during the DDoS Attack described herein. If we do not handle customer complaints effectively, then our brand and reputation may suffer, our customers may lose confidence in us and they may reduce or cease their use of our services. In addition, many of our customers post and discuss on social media about products and services, including our services and our communications platform. Our success depends, in part, on our ability to generate positive customer feedback and minimize negative feedback on social media channels where existing and potential customers seek and share information. If actions we take or changes we make to our services or our communications platform upset these customers, then their online commentary could negatively affect our brand and reputation. Complaints or negative publicity about us, our services or our communications platform could materially and adversely affect our ability to attract and retain customers, our business, results of operations and financial condition.

The promotion of our brand also requires us to make substantial expenditures, and we anticipate that these expenditures will increase as our market becomes more competitive and as we expand into new markets. To the extent that these activities increase revenue, this revenue still may not be enough to offset the increased expenses we incur. In addition, due to restrictions on travel and in-person meetings resulting from COVID-19, we have attended planned customer and industry events as virtual-only experiences and cancelled others. We may alter, postpone or cancel other events in the future. Virtual meetings, events and interactions may not be as successful and may constrain our marketing, promotional and sales activity. If we do not successfully maintain and enhance our brand, then our business may not grow, we may see our pricing power reduced relative to competitors and we may lose customers, all of which would adversely affect our business, results of operations and financial condition.

Any failure to deliver and maintain high-quality customer support may adversely affect our relationships with our customers and prospective customers and could adversely affect our reputation, business, results of operations and financial condition.

Many of our customers depend on our customer support team to assist them in deploying or using our services effectively, to help them resolve post-deployment issues quickly and to provide ongoing support. If we do not devote sufficient resources or are otherwise unsuccessful in assisting our customers effectively, it could adversely affect our ability to retain existing customers and could prevent prospective customers from adopting our services. We may be unable to respond quickly enough to accommodate short-term increases in demand for customer support. We also may be unable to modify the nature, scope and delivery of our customer support to compete with changes in the support services provided by our competitors. Increased demand for customer support, without corresponding revenue, could increase costs and adversely affect our business, results of operations and financial condition. Our sales are highly dependent on our business reputation and on positive recommendations from existing customers. Any failure to deliver and maintain high-quality customer support, or a market perception that we do not maintain high-quality customer support, could adversely affect our reputation, business, results of operations and financial condition.

We operate internationally, which exposes us to significant risks.

We have expanded our international operations, including the deployment of two data centers in Frankfurt and London, the establishment of a limited presence in each of Frankfurt and Madrid primarily for regulatory purposes, and

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the acquisition of Voxbone as further described below under “—Risks Related to the Acquisition of Voxbone.” As part of our growth strategy, we will continue to evaluate potential opportunities for further international expansion.

Operating in international markets requires significant resources and management attention, and will subject us to regulatory, economic and political risks in addition to those we face in the United States. We have limited experience with international operations, and our further international expansion efforts may not be successful.

In addition, we face risks in doing business internationally that could adversely affect our business, including:

•exposure to political developments in the United Kingdom (“U.K.”), including the January 2020 departure of the U.K. from the European Union (“EU”), which has created an uncertain political and economic environment, instability for businesses and volatility in global financial markets and the value of foreign currencies, all of which could disrupt trade, the sale of our services and the mobility of our employees and contractors between the U.K., EU and other jurisdictions;

•difficulties in managing and staffing international operations, including difficulties related to the increased operations, travel, infrastructure, employee attrition and legal compliance costs associated with numerous international locations;

•our ability to effectively price our products in competitive international markets;

•new and different sources of competition;

•costs associated with network service providers outside of the United States;

•the need to adapt and localize our products for specific countries;

•difficulties in understanding and complying with local laws, regulations and customs in foreign jurisdictions, particularly in the areas of telecommunications, data privacy and security;

•difficulties related to differing technical standards, data privacy and telecommunications regulations and certification requirements outside the United States, which could prevent customers from deploying our products or limit their usage;

•export controls and economic sanctions administered by the Bureau of Industry and Security of the U.S. Department of Commerce and the Office of Foreign Assets Control of the U.S. Department of the Treasury;

•compliance with various anti-bribery and anti-corruption laws, such as the U.S. Foreign Corrupt Practices Act and U.K. Bribery Act 2010;

•international trade policies, tariffs and other non-tariff barriers, such as quotas;

•more limited protection for intellectual property rights in some countries;

•adverse tax consequences;

•fluctuations in currency exchange rates, which could increase the price of our products outside of the United States, increase the expenses of our international operations and expose us to foreign currency exchange rate risk;

•currency control regulations, which might restrict or prohibit our conversion of other currencies into U.S. dollars;

•restrictions on the transfer of funds;

•deterioration of political relations between the United States and other countries;

•public health epidemics, such as COVID-19, or natural disasters, which could have an adverse impact on our employees, contractors, customers, partners, travel and the global economy; and

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•political or social unrest or economic instability in a specific country or region in which we operate, which could have an adverse impact on our operations in that location.

In addition, due to potential costs from our international expansion efforts and network service provider fees outside of the United States, our gross margin for international customers may be lower than our gross margin for domestic customers. As a result, our overall gross margin may fluctuate as we further expand our operations and customer base internationally.

Our failure to manage any of these risks successfully could harm our international operations, and adversely affect our business, results of operations and financial condition.

Our revenue is concentrated in a limited number of enterprise customers.

A significant portion of our revenue is concentrated among a limited number of enterprise customers. If we lost one or more of our top ten customers, or, if one or more of these major customers significantly decreased orders for our services, our business would be materially and adversely affected.

Attacks on or breaches of our networks or systems, or those of third parties upon which we rely, could degrade our ability to conduct our business, compromise the integrity of our services and our communications platform, result in service degradation or outages, significant data losses, the theft of our intellectual property, investigations by government agencies and damage to our reputation, and could expose us to liability to third parties and require us to incur significant additional costs to maintain the security of our networks and data.

We depend upon our IT systems to conduct virtually all of our business operations, ranging from our internal operations and R&D activities to our marketing and sales efforts and communications with our customers and business partners. Cyber-attacks, including through the use of malware, computer viruses, distributed denial of services (“DDoS”) attacks, ransomware attacks, credential harvesting and other means for obtaining unauthorized access to or disrupting the operation of our networks and systems and those of our suppliers, vendors and other service providers, could cause harm to our business, including by misappropriating our proprietary information or that of our customers, employees and business partners or to cause interruptions of our services and our communications platform. Cyber-attacks may cause service degradation or outages, equipment failures, loss of information, including sensitive personal information of customers or employees or valuable technical and marketing information, as well as disruptions to our or our customers’ operations. Cyber-attacks against companies have increased in frequency, scope and potential harm in recent years. Further, the perpetrators of cyber-attacks are not restricted to particular groups or persons. These attacks may be committed by company employees or external actors operating in any geography, including jurisdictions where law enforcement measures to address such attacks are unavailable or ineffective, and may even be launched by or at the behest of nation states.

Despite our efforts to reduce the risks associated with cyber-attacks, including the implementation of a number of defensive measures and protocols designed to protect our systems and networks, such efforts may be insufficient to repel or mitigate the effects of a major cyber-attack. For example, beginning on September 25, 2021, our communications network experienced DDoS attacks that caused intermittent service disruptions affecting certain of our markets and customers. A DDoS attack is a malicious attempt to disrupt the normal traffic of a targeted server, service or network by overwhelming the target or its surrounding infrastructure with a flood of unwanted internet traffic from multiple sources, resulting in the slowdown or blockage of legitimate traffic. The techniques employed by the DDoS attackers continued to evolve, and we implemented a number of additional DDoS mitigation techniques as the incident unfolded. We will continue to deploy security enhancements in an effort to further secure our network against such attacks, and while we believe we have remediated the immediate consequences of this incident, cybersecurity events may have cascading effects that unfold over time and result in additional costs, including costs associated with defensive measures, investigations, contractual claims, performance penalties, litigation, the loss of future business and other losses and liabilities that may be difficult to foresee. Any perception by existing and prospective customers that our network and systems are not secure could result in a material loss of business and revenue and damage our reputation. Moreover, while we currently have no indication that our systems were breached or data exfiltrated in the DDoS attacks, we cannot guarantee we will not uncover evidence of exfiltration or misuse of data or systems from this incident. We cannot guarantee we will not experience a future cyber-attack or incident resulting in exfiltration or misuse of data or systems.

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The techniques used by individuals or entities to access, disrupt or sabotage devices, systems and networks change frequently and may not be recognized until launched against a target. We may be unable to anticipate these techniques, and we may not become aware in a timely manner of a security breach, which could exacerbate the negative impact of such an event on our business or that of our customers. Additionally, we depend upon our employees and contractors to appropriately handle confidential and sensitive data, including customer data and customer proprietary network information pursuant to applicable federal law, and to deploy our IT resources in a safe and secure manner that does not expose our network systems to security breaches or the loss of data. Any data security incidents, including inadvertent disclosure or internal malfeasance by our employees, unauthorized access or usage, virus or similar breach or disruption of us or our services providers, could result in a loss of confidential information, theft of our intellectual property, damage to our reputation, loss of customers, litigation, regulatory investigations, fines, penalties and other liabilities.

Our existing general liability and cyber liability insurance policies may not cover, or may cover only a portion of, any potential claims related to cyber incidents or security breaches that we experience or may not be adequate to indemnify us for all or any portion of liabilities that may be imposed. We also cannot be certain that our existing insurance coverage will continue to be available on acceptable terms or in amounts sufficient to cover the potentially significant losses that may result from a security incident or breach or that the insurer will not deny coverage of any future claim. Accordingly, if our cybersecurity measures and those of our service providers, fail to protect against unauthorized access, attacks (which may include sophisticated cyber-attacks) and the mishandling of data by our employees and contractors, then our reputation, business, results of operations and financial condition could be adversely affected.

We are currently subject to litigation related to taxes and charges associated with our provision of 911 services, which could divert management’s attention and adversely affect our results of operations.

We, along with many other telecommunications companies and similar service providers, currently are subject to litigation regarding our billing, collection and remittance of non-income-based taxes and other similar charges regarding 911 services alleged to apply in certain states, counties, and municipalities located in California, Illinois, New York, Pennsylvania, and Rhode Island. See the section titled “Item 3. Legal Proceedings”. We may face similar litigation in other jurisdictions in the future. While we are vigorously defending these lawsuits, litigation is inherently uncertain. Tax assessments, penalties and interest or future requirements arising from these lawsuits, or any other lawsuits that may arise in other jurisdictions, may adversely affect our business, results of operations and financial condition.

We face a risk of litigation resulting from customer misuse of our services and software to make or send unauthorized calls and/or messages, including those in violation of the Telephone Consumer Protection Act. Customer misuse of our services and software also could damage our reputation.

Calls and/or text messages originated by our customers may subject us to potential risks, including litigation, regulatory enforcement, fines, and reputational damage. For example, the Telephone Consumer Protection Act of 1991 (the “TCPA”) restricts telemarketing and the use of technologies that enable automatic calling and/or messaging without proper customer consent. This may result in civil claims against us, including those arising due to our customers’ use of our platform, and requests for information through third-party subpoenas or regulatory investigations. For example, we, along with other telecommunications companies, have been named as a defendant in a TCPA action relating to our alleged failure to block unsolicited phone calls to the plaintiff and putative class members. See the section titled “Item 3. Legal Proceedings” in our Annual Report on Form 10-K for the year ended December 31, 2020. Internationally, we also may become subject to similar laws imposing limitations on marketing calls to wireline and wireless numbers. The scope and interpretation of the laws that are or may be applicable to the making and/or delivery of calls and/or messages are continuously evolving and developing. If we do not comply with these laws or regulations or if we become liable under these laws or regulations due to the failure of our customers to comply with these laws by taking mandatory actions such as obtaining proper customer consent, we could become subject to lawsuits, fines, civil penalties, potentially significant statutory damages, consent decrees, injunctions, adverse publicity, loss of user confidence in our services, loss of users and other adverse consequences, which could materially harm our business.

Some of our customers may use our platform to transmit illegal, offensive or unauthorized calls and messages, including spam, phishing scams, and links to harmful applications. Some of our customers also may reproduce and distribute copyrighted material or the trademarks of others without permission. Such actions violate our practices and

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policies, including our Acceptable Use Policy, which applies to all customers. We generally complete considerable “know-your-customer” reviews before a customer, and in certain jurisdictions an end user, can use our platform, although we cannot always conduct proactive audits of our customers thereafter to confirm compliance with our practices and policies, including our Acceptable Use Policy. We generally rely on our customers’ contractual representations to us that their use of our platform will comply with applicable law and our practices and policies. In cases where our customers are reselling our services, we are relying on a contractual pass-through by our customers of similar contractual representations from their end users. We also generally evaluate complaints that we receive regarding our customers’ use of our platform. Our substantial efforts will not prevent all illegal robocalls and other fraudulent activity. The unlawful or fraudulent use of our platform could subject us to claims for damages, copyright or trademark infringement, regulatory enforcement, fraud, or negligence or damage our reputation. Even if claims asserted against us do not result in liability, we may incur substantial costs to investigate and defend such claims. If we are liable for our customers’ activities, we could be required to pay fines or penalties, redesign our business methods, limit our ability to provide certain services or otherwise expend resources to remedy any damages caused by such actions and avoid future liability.

The communications industry faces significant regulatory uncertainties and the resolution of these uncertainties could harm our business, results of operations and financial condition.

If current or future regulations change, the Federal Communications Commission (the “FCC”), state or international regulators may not grant us required regulatory authorizations or may take action against us if we are found to have provided services without obtaining the necessary authorizations, or to have violated other requirements of their rules and orders. Delays in receiving required regulatory approvals or the enactment of new adverse regulation or regulatory requirements may slow our growth and have a material adverse effect on our business, results of operations and financial condition.

Proceedings before the FCC or international regulators could limit our access to various network services or further increase the rates we must pay for such services. For example, the availability and price of special access facilities could be affected by proceedings before the FCC, changes to applicable FCC rules and FCC forbearance from the enforcement of obligations on incumbent local exchange carriers (“LECs”). Other proceedings before the FCC could result in an increase in the amount we pay to other carriers or a reduction in the revenue we derive from other carriers in, or retroactive liability for, access charges and reciprocal compensation. For example, on December 17, 2019, the FCC issued an order that revised its interpretation of the Voice-over Internet Protocol (“VoIP”) symmetry rule. The FCC now concludes that LECs may assess end office switched access charges only if the LEC or its VoIP partner provides a physical connection to the last-mile facilities used to serve an end user. If neither the LEC nor its VoIP partner provides such a physical connection, the LEC may not assess end office switched access charges. The FCC also decided to give its order retroactive effect. We cannot predict the impact this FCC order may have on our business, including whether other carriers will agree with our legal interpretations and treatments, at this time. Other proceedings before the FCC could also result in increases in the cost of regulatory compliance. For example, the FCC has opened a proceeding to examine how to improve the delivery of emergency 911 services and whether to expand requirements to include communications services not currently subject to emergency calling obligations. A number of states also have proceedings pending that could impact our access to and the rates we pay for network services. Other state proceedings could limit our pricing and billing flexibility. Our business would be substantially impaired if the FCC, the courts or state commissions eliminated our access to the facilities and services we use to serve our customers, substantially increased the rates we pay for facilities and services, increased the costs or complexity associated with providing emergency 911 services or adversely affected the revenue we receive from other carriers or our customers. In addition, congressional legislative efforts to rewrite the Telecommunications Act of 1996 or enact other telecommunications legislation, as well as various state legislative initiatives, may cause major industry and regulatory changes. We cannot predict the outcome of these proceedings or legislative initiatives or the effects, if any, that these proceedings or legislative initiatives may have on our business and operations.

While we believe we are currently in compliance with all federal, state, local and international rules and regulations, these regulations are subject to interpretation and the relevant regulators may determine that our application of these rules and regulations is not consistent with their interpretation. Additionally, in certain instances, third parties or government agencies may bring action with federal, state, local or international regulators if they believe a provider has breached applicable rules and regulations.

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The effects of increased regulation of IP-based service providers are unknown.

While the FCC has to date generally subjected IP-based service providers in the United States to less stringent regulatory oversight than traditional common carriers, the FCC has imposed certain regulatory obligations on providers of interconnected and non-interconnected VoIP services, including the obligations to contribute to the Universal Service Fund, to provide 911 services, and to comply with the Communications Assistance for Law Enforcement Act. The recently enacted TRACED Act aims to mitigate illegal robocalls by directing the FCC to conduct certain rulemaking proceedings that include adopting rules that require participation in the technical standard known as the Secure Telephone Identity Revisited (“STIR”) and Signature-based Handling of Asserted Information Using toKENs (“SHAKEN”) (together, “STIR/SHAKEN”), among other requirements. The TRACED Act applies to both IP-based and non-IP-based service providers. Further, some states have imposed taxes, fees and/or surcharges on interconnected VoIP telephony services. The imposition of additional regulations could have a material adverse effect on our business.

We must obtain and maintain permits and licenses to operate our network.

If we are unable, on acceptable terms and on a timely basis, to obtain and maintain the permits and licenses needed to expand and operate our network, our business could be materially adversely affected. In addition, the cancellation or non-renewal of the permits or licenses that are obtained could materially adversely affect our business. In the event we are the target of an acquisition, the regulatory agencies responsible for granting, renewing or transferring permits and licenses may delay or reject applications to transfer such permits or licenses and as a result these uncertainties, we may not be as attractive an acquisition target.

Our operations are subject to regulation and require us to obtain and maintain several governmental licenses and permits. If we violate those regulatory requirements or fail to obtain and maintain those licenses and permits, including payment of related fees, if any, we may not be able to conduct our business. Moreover, those regulatory requirements could change in a manner that significantly increases our costs or otherwise adversely affects our operations.

In the ordinary course of operating our network and providing our services, we must obtain and maintain a variety of telecommunications and other licenses and authorizations. We also must comply with a variety of regulatory obligations. There can be no assurance we can maintain our licenses or that they will be renewed upon their expiration. Our failure to obtain or maintain necessary licenses, authorizations or to comply with the obligations imposed upon license holders, including the payment of fees, may cause sanctions or additional costs, including the revocation of authority to provide services.

Our operations are subject to regulation at the national level and, often, at the state and local levels. Our operations are also subject to additional regulation by other countries in international markets. Changes to existing regulations or rules, or the failure to regulate going forward in areas historically regulated on matters such as network neutrality, licensing fees, environmental, health and safety, privacy, intercarrier compensation, emergency services, interconnection, illegal robocalling, extra-territorial use of telephone numbers, and other areas, in general or particular to our industry, may increase costs, restrict operations or decrease revenue. For example, the TRACED Act aims to mitigate illegal robocalls by directing the FCC to develop rules requiring participation in the technical standard known as STIR/SHAKEN among other things. We are also subject to telecommunications laws and regulations in the non-U.S. countries where we offer our products. Our international operations are subject to country-specific laws and governmental regulation that may increase our costs or impact our products and communications platform or prevent us from offering or providing our products in certain countries. Many existing non-US laws and regulations may not fully contemplate CPaaS solutions and the interpretation and enforcement of non-US laws and regulations may involve significant uncertainties. For example, several European countries have adopted “know your customer” requirements regarding end users and have mandated the real-time provisioning of the data to national law enforcement authorities. Future legislative, regulatory or judicial actions impacting CPaaS solutions also could increase the cost and complexity of compliance and expose us to liability. Our inability or failure to comply with telecommunications and other laws and regulations could cause the temporary or permanent suspension of our operations. In addition, if we cannot provide emergency calling functionality through our communications platform to meet any new federal or state requirements, or any applicable requirements from other countries, the competitive advantages that we currently have may not persist, adversely affecting our ability to obtain and to retain enterprise customers which could have an adverse impact on our business.

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In January 2018, the FCC repealed its Network Neutrality Rules. Our business could suffer with respect to the quality of the services we offer, our ability to maintain our internet-based services and our services offered through our communications platform, decrease our profitability or increase the price of our services making our offerings less competitive in the marketplace.

In January 2018, the FCC adopted an order largely repealing its network neutrality rules. Among other things, the pre-existing network neutrality rules prevented providers of broadband internet access services—like cable and telephone companies—from blocking, impairing and degrading service offerings from non-affiliated third parties like us. The FCC’s order repealing the pre-existing network neutrality rules was appealed by a number of parties. In October 2019, a three judge panel of the U.S. Court of Appeals for the District of Columbia Circuit issued a decision that largely affirmed the FCC’s order, including the reclassification of broadband Internet access as an information service. The court, however, vacated the FCC’s decision that would have prospectively barred states from imposing any rule or requirement that was inconsistent with the FCC’s order. The appellate court’s decision is subject to rehearing by the full court or parties may seek to appeal the decision to the U.S. Supreme Court. Various companies appealed the federal court of appeals decision in December 2019. We cannot predict whether the FCC will reverse its January 2018 order, whether the appeal will be successful or whether any states will adopt legislation that results in restoring the pre-existing network neutrality rules that prevent broadband internet access service providers from blocking, impairing and degrading offerings from third parties like us. If broadband providers were to block, impair or degrade our internet-based services or services we offer through our communications platform, or if broadband internet access providers were to charge us or our customers to access and use our internet-based services or services offered through our communications platform, we could lose customers, our profitability could decrease, or we may have to raise prices, making our service less competitive in the marketplace. Most of the major broadband internet access providers have publicly stated that they will not block, impair or degrade third party offerings. We cannot predict the potential impact of the January 2018 FCC network neutrality order on our offerings at this time.

We are subject to privacy and data security obligations in the United States. Any failure to comply with applicable laws, regulations or contractual obligations may harm our business, results of operations and financial condition. The FCC, other federal agencies and state attorneys’ general could fine or subject us to other adverse actions that may negatively impact our business reputation. If we are subject to an investigation or suffer a breach, we may incur costs or be subject to forfeitures and penalties that could reduce our profitability.

We are subject to privacy and data security laws and regulations that impose obligations in connection with the collection, processing and use of personal data. Federal and state laws or proposed laws impose limits on, or requirements regarding, the collection, distribution, use, security and storage of personally identifiable information (“PII”) of individuals. We see increased regulation of data privacy and security, including the adoption of more stringent subject matter specific state laws in the United States. For example, in 2018, California enacted the California Consumer Privacy Act (“CCPA”), which became effective on January 1, 2020. The CCPA gives California residents expanded rights to access and delete their personal information, opt out of certain personal information sharing, and receive detailed information about how their personal information is used. The CCPA provides for civil penalties for violations, as well as a private right of action for data breaches that is expected to increase data breach litigation. Some observers have noted that the CCPA could mark the beginning of a trend toward more stringent state privacy legislation in the U.S., which could increase our potential liability and adversely affect our business. Further, in November 2020, California voters passed the California Privacy Rights Act (“CPRA”). The CPRA, which is expected to take effect on January 1, 2023 and to create obligations with respect to certain data relating to consumers as of January 1, 2022, significantly expands the CCPA, including by introducing additional obligations such as data minimization and storage limitations, granting additional rights to consumers, such as correction of personal information and additional opt-out rights, and creates a new entity, the California Privacy Protection Agency, to implement and enforce the law. The CCPA and CPRA may increase our compliance costs and potential liability.

We also may be bound by contractual obligations relating to our collection, use and disclosure of personal data or may find it necessary or desirable to join industry or other self-regulatory bodies or other privacy or security related organizations that require compliance with their rules pertaining to privacy and data protection.

We are subject to individual or joint jurisdiction of the FCC, the Federal Trade Commission, and state attorneys’ general with respect to privacy and data security obligations. If we were to suffer or if one of our customers were to suffer

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a breach, we may be subject to the jurisdiction of a variety of federal agencies’ jurisdictions, as well as state attorneys’ general. We may have to comply with a variety of data breach laws at the federal and state levels, comply with any resulting investigations, as well as offer mitigation to customers and potential end users of certain customers to which we provide services. We could also be subject to fines, forfeitures and other penalties that may adversely impact our business.

Any failure or perceived failure by us, our products or the communications platform to comply with new or existing U.S. privacy or data security laws, regulations, policies, industry standards or contractual or legal obligations, or any security incident that results in the unauthorized access to, or acquisition, release or transfer of, PII or other customer data may result in governmental investigations, inquiries, enforcement actions and prosecutions, private litigation, fines and penalties, adverse publicity or potential loss of business.

Our business is subject to complex and evolving foreign laws and regulations regarding privacy, data protection and other matters relating to information collection.

There are numerous foreign laws, regulations and directives regarding privacy and the collection, retention, storage, transmission, use, processing, disclosure and protection of PII and other personal or customer data, the scope of which is continually evolving and subject to differing interpretations. We must comply with applicable laws, regulations and directives and we may be subject to significant consequences, including penalties and fines, for our failure to comply.

Uncertainty and changes in the requirements of multiple jurisdictions may increase the cost of compliance, delay or reduce demand for our services, restrict our ability to offer services in certain locations, impact our customers’ ability to utilize our services in certain jurisdictions, or subject us to sanctions by national data protection regulators, all of which could harm our business, financial condition and results of operations.

For example, as of May 25, 2018, the General Data Protection Regulation (“GDPR”), replaced the Data Protection Directive with respect to the processing of PII in the EU. The GDPR imposes several stringent requirements for controllers and processors of PII (including non-EU processors who process personal data on behalf of EU controllers), including, for example, more robust internal accountability controls, a strengthened individual data rights regime, shortened timelines for data breach notifications, limitations on retention and secondary use of information and additional obligations when we contract with third parties in connection with the processing of the PII. Failure to comply with the requirements of GDPR and the applicable national data protection laws of the EU member states may result in fines of up to €20 million or up to 4% of the total worldwide annual revenue for the preceding financial year, whichever is higher, and other administrative penalties. Complying with the GDPR has required us to implement additional mechanisms. As we continue to operate under the GDPR, compliance may become onerous and adversely affect our business, financial condition, results of operations and prospects.

In addition, recent legal developments in Europe have created complexity and compliance uncertainty regarding certain transfers of information from the EU to the United States. On July 16, 2020, the Court of Justice of the European Union (the “CJEU”) invalidated the Privacy Shield Framework. The CJEU also imposed substantial requirements upon the continued use of standard contractual clauses for data transfers from the EU to the United States, which may make the use of standard contractual clauses difficult or impossible to use under some circumstances. We and our customers are at risk of enforcement actions taken by European regulators until such point in time that we are able to ensure that all data transfers to the United States from the EU are legitimized. We also may encounter additional complexity with respect to data privacy and data transfers from the U.K. resulting from the U.K.’s transition out of the EU. If we are unable to transfer PII between and among countries and regions in which we operate or may operate in the future, it could affect the manner in which we provide our services or could adversely affect our financial results.

Furthermore, any failure, or perceived failure, by us to comply with or make effective modifications to our policies, or to comply with any federal, state or international privacy, data-retention or data-protection-related laws, regulations, orders or industry self-regulatory principles could result in proceedings or actions against us by governmental entities or others, a loss of customer confidence, damage to our brand and reputation or a loss of customers, any of which could have an adverse effect on our business. In addition, various federal, state and foreign legislative or regulatory bodies may enact new or additional laws and regulations concerning privacy, data-retention and data-protection issues, including laws or regulations mandating disclosure to domestic or international law enforcement bodies, which could adversely impact our business, our brand or our reputation with customers. For example, some countries have adopted laws

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mandating that PII regarding customers in their country be maintained solely in their country. Having to maintain local data centers and redesign product, service and business operations to limit PII processing to within individual countries could increase our operating costs significantly.

Our business could suffer if we cannot obtain or retain local or toll-free numbers, are prohibited from obtaining local or toll-free numbers, or are limited to distributing local or toll-free numbers to only certain customers.

Our future success depends on our ability to procure large quantities of local and toll-free numbers to meet customer demands at reasonable cost and without undue restrictions. Our ability to procure and distribute numbers depends on factors outside of our control, such as applicable regulations, the practices of the communications carriers that provide numbers to us in certain jurisdictions, the cost of obtaining and managing numbers and the level of demand for new numbers. Due to their limited availability, there are certain popular area code prefixes and specialized “vanity” toll-free numbers that we may not be able to obtain in desired quantities or at all. Our inability to acquire or retain numbers for our operations would make our services, including our communications platform, less attractive to potential customers that desire assignments of particular numbering resources. In addition, future growth of our customer base, together with growth of customer bases of other providers of communications services, has increased, which increases our dependence on needing large quantities of local and toll-free numbers associated with desirable area codes or specific toll-free numbering resources at a reasonable cost and without undue restriction. If we are not able to obtain or retain adequate local and toll-free numbers, or attractive subsets of such resources, our business, results of operations and financial condition could be materially adversely affected.

In addition, in order to procure, distribute and retain telephone numbers in certain foreign jurisdictions, we will be required to register with the local telecommunications regulatory authorities, some of which have been increasingly monitoring and regulating the categories of phone numbers that are eligible for provisioning to our customers, including geographical, regional, local and toll-free phone numbers. We have registered or obtained licenses, or are in the process of registering or obtaining licenses, in various countries in which we do business, but in some countries, the regulatory regime around provisioning of phone numbers is unclear, subject to change over time, and sometimes may conflict from jurisdiction to jurisdiction. Furthermore, these regulations and governments’ approach to their enforcement, as well as our products and services, are still evolving and we may be unable to maintain compliance with applicable regulations, or enforce compliance by our customers, on a timely basis or without significant cost. Also, compliance with these types of regulations may require changes in products or business practices that result in reduced revenue. If we or our customers use or assign phone numbers in these countries in a manner that violates applicable rules and regulations, we may also be subject to significant penalties or governmental action, including government-initiated audits and, in extreme cases, may be precluded from doing business in that particular country. In the event of such non-compliance, we may be forced to reclaim phone numbers from our customers, which could result in loss of customers, breach of contract claims, loss of revenue and reputational harm, all of which could have a material adverse effect on our business, results of operations and financial condition.

We face exposure to foreign currency exchange rate fluctuations, and such fluctuations could adversely affect our business, results of operations and financial condition.

We face exposure to the effects of fluctuations in currency exchange rates. While historically we have primarily transacted in U.S. dollars, we generally have transacted with customers and partners in Europe in British Pounds and Euros. We expect to expand the number of transactions with customers and partners that are denominated in foreign currencies in the future as we continue to expand our business internationally. We also incur expenses for some of our network service provider costs outside of the United States in local currencies and for employee compensation and other operating expenses in local currency. Fluctuations in the exchange rates between the U.S. dollar and other currencies could result in an increase to the U.S. dollar equivalent of such expenses.

In addition, our international subsidiaries maintain net assets denominated in currencies other than the functional operating currencies of these entities. As we expand our international operations, we will become more exposed to the effects of fluctuations in currency exchange rates. Accordingly, changes in the value of foreign currencies relative to the U.S. dollar may affect our results of operations due to transactional and translational remeasurements. Such foreign currency exchange rate fluctuations could make it more difficult to detect underlying trends in our business and results of operations. The trading price of our Class A common stock also could be adversely affected if fluctuations in currency

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exchange rates cause our results of operations to differ from our expectations or the expectations of our investors and securities analysts who follow our stock.

We do not currently maintain a program to hedge transactional exposures in foreign currencies. However, in the future, we may use derivative instruments, such as foreign currency forward and option contracts, to hedge certain exposures to fluctuations in foreign currency exchange rates. The use of such hedging activities may not offset any or more than a portion of the adverse financial effects of unfavorable movements in foreign exchange rates over the limited time the hedges are in place. Moreover, the use of hedging instruments may introduce additional risks if we are unable to structure effective hedges with such instruments.

We may be exposed to liabilities under anti-corruption, export control and economic sanction regulations, and similar laws and regulations, and any determination that we violated any of these laws or regulations could have a material adverse effect on our business.

We are subject to the Foreign Corrupt Practices Act (“FCPA”), the U.K. Bribery Act and other laws that prohibit improper payments or offers of payments to foreign governments and their officials, political parties, and/or private parties by persons and entities for the purpose of obtaining or retaining business. Our international activities create the risk of unauthorized payments or offers of payments by one of our employees or consultants, even though these parties are not always subject to our control. Our policies prohibit these practices by our employees and consultants, although our existing safeguards and any future improvements may prove to be less than effective, and our employees or consultants may engage in conduct for which we might be held responsible. Violations of the FCPA, the U.K. Bribery Act or other laws may result in severe criminal or civil sanctions, and we may be subject to other liabilities, which could negatively affect our business, operating results, and financial condition.

Our products and services may be subject to export control and economic sanctions regulations, including the U.S. Export Administration Regulations, U.S. Customs regulations and various economic and trade sanctions regulations administered by the U.S. Treasury Department’s Office of Foreign Assets Control. Our products and services must be offered and sold in compliance with these laws and regulations. If we do not comply with these laws or regulations or if we become liable under these laws or regulations due to the failure of our customers to comply with these laws by obtaining proper consent, we could face liability. In addition, changes in our products or services, changes in applicable regulations, or change in the target of such regulations, could also result in decreased use of our products and services, or in our decreased ability to sell our products or provide our services to existing or prospective customers with international operations. Any decreased use of our products and services or limitation on our ability to export our products and provide our services could adversely affect our business, results of operations and financial condition.

Intellectual property and proprietary rights of others could prevent us from using necessary technology to provide our services or subject us to expensive intellectual property litigation.

If technology that we require to provide our services, including our communications platform, was determined by a court to infringe a patent held by another entity that will not grant us a license on terms acceptable to us, we could be precluded by a court order from using that technology and we would likely be required to pay significant monetary damages to the patent holder. The successful enforcement of these patents, or our inability to negotiate a license for these patents on acceptable terms, could force us to cease (i) using the relevant technology and (ii) offering services incorporating the technology. If a claim of infringement was brought against us based on the use of our technology or against our customers based on their use of our services for which we are obligated to indemnify, we could be subject to litigation to determine whether such use or sale is, in fact, infringing. This litigation could be expensive and distracting, regardless of the outcome.

While our own limited patent portfolio may deter other operating companies from bringing such actions, patent infringement claims may also be asserted by patent holding companies, which do not use technology and whose sole business is to enforce patents against operators, such as us, for monetary gain. Because such patent holding companies, commonly referred to as patent “trolls,” do not provide services or use technology, the assertion of our own patents by way of counter-claim would be largely ineffective.

Our use of open source software could negatively affect our ability to sell our services and subject us to possible litigation.

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Our services, including our communications platform, incorporate open source software, and we expect to continue to incorporate open source software in our services in the future. Few of the licenses applicable to open source software have been interpreted by courts, and there is a risk that these licenses could be construed in a manner that could impose unanticipated conditions or restrictions on our ability to commercialize our services, including our communications platform. Moreover, although we have implemented policies to regulate the use and incorporation of open source software into our services, we cannot be certain that we have not incorporated open source software in our services in a manner that is inconsistent with such policies. If we fail to comply with open source licenses, we may be subject to certain requirements, including requirements that we offer our services that incorporate the open source software for no cost, that we make available source code for modifications or derivative works we create based upon, incorporating or using the open source software and that we license such modifications or derivative works under the terms of applicable open source licenses. If an author or other third-party that distributes such open source software were to allege that we had not complied with the conditions of one or more of these licenses, we could be required to incur significant legal expenses defending against such allegations and could be subject to significant damages, enjoined from generating revenue from customers using services that contained the open source software and required to comply with onerous conditions or restrictions on these services. In any of these events, we and our customers could be required to seek licenses from third parties in order to continue offering our services and to re-engineer our services or discontinue offering our services to customers in the event re-engineering cannot be accomplished on a timely basis. Any of the foregoing could require us to devote additional R&D resources to re-engineer our services, could result in customer dissatisfaction and may adversely affect our business, results of operations and financial condition.

Indemnity provisions in various agreements potentially expose us to substantial liability for intellectual property infringement and other losses.

Our agreements with customers and other third parties typically include indemnification or other provisions under which we agree to indemnify or otherwise be liable to them for losses suffered or incurred as a result of claims of intellectual property infringement, damages caused by us to property or persons or other liabilities relating to or arising from our services or platform or other acts or omissions. The term of these contractual provisions often survives termination or expiration of the applicable agreement. Large indemnity payments or damage claims from contractual breach could harm our business, results of operations and financial condition. Although we normally contractually limit our liability with respect to such obligations, we may still incur substantial liability related to them. Any dispute with a customer with respect to such obligations could have adverse effects on our relationship with that customer and other current and prospective customers, reduce demand for our services and adversely affect our business, results of operations and financial condition.

The storage, processing and use of personal information and related data subjects us to evolving governmental laws and regulation, commercial standards, contractual obligations and other legal obligations related to consumer and data privacy, which may have a material impact on our costs, use of our services, or expose us to increased liability.

Federal, state, local and foreign laws and regulations, commercial obligations and industry standards, each provide for obligations and restrictions with respect to data privacy and security, as well as the collection, storage, retention, protection, use, processing, transmission, sharing, disclosure and protection of personal information and other customer data, including customer proprietary network information under applicable federal law. The evolving nature of these obligations and restrictions subjects us to the risk of differing interpretations, inconsistency or conflicts among countries or rules, and creates uncertainty regarding their application to our business.

These obligations and restrictions may limit our ability to collect, store, process, use, transmit and share data with our customers, employees and third-party providers and to allow our customers to collect, store, retain, protect, use, process, transmit, share and disclose data with others through our services. Compliance with, and other burdens imposed by, such obligations and restrictions could increase the cost of our operations and impact our ability to market our services through effective segmentation.

Failure to comply with obligations and restrictions related to applicable data protection laws, regulations, standards, and codes of conduct, as well as our own posted privacy policies, privacy notices, and contractual commitments could subject us to lawsuits, fines, criminal penalties, statutory damages, consent decrees, injunctions, adverse publicity, loss of user confidence in our services, and loss of users, which could materially harm our business. Because these

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obligations and restrictions have continued to develop and evolve rapidly, it is possible that we may not be, or may not have been, compliant with each such obligation and restriction. Additionally, third-party contractors may have access to customer or employee data. If these or other third-party vendors violate obligations and restrictions related to applicable data protection laws or our policies, such violations may also put our customers’ or employees’ information at risk and could in turn have a material and adverse effect on our business.

If we fail to protect our internally developed systems, technology and software and our patents and trademarks, we may become involved in costly litigation or our business or brand may be harmed.

Our ability to compete effectively is dependent in large part upon the maintenance and protection of systems and software that we have developed internally, including some systems and software based on open standards. We cannot patent much of the technology that is important to our business. In addition, any pending patent applications may not be granted, and any issued patent that we own may be challenged, narrowed, invalidated or circumvented. To date, we have relied on patent, copyright and trade secret laws, as well as confidentiality procedures and licensing arrangements, to establish and protect our rights to our technology. While we typically enter into confidentiality agreements with our employees, consultants, customers, and vendors in an effort to control access to and distribution of technology, software, documentation and other information, these agreements may not effectively prevent disclosure of confidential information and may not provide an adequate remedy in the event of unauthorized disclosure of confidential information. Despite these precautions, it may be possible for a third party to copy or otherwise obtain and use our technology without authorization. In addition, others may independently discover trade secrets and proprietary information, and in such cases we could not assert any rights against such party. Policing unauthorized use of our technology is difficult. The steps we take may not prevent misappropriation of the technology we rely on. In addition, effective protection may be unavailable or limited in some jurisdictions outside the United States. Litigation may be necessary in the future to enforce or protect our rights or to determine the validity and scope of the rights of others. That litigation could cause us to incur substantial costs and divert resources away from our daily business, which in turn could adversely affect our business, results of operations and financial condition.

The unlicensed use of our brands by third parties could harm our reputation, cause confusion among our customers or impair our ability to market our services. Accordingly, we have registered trademarks and service marks and have applied for registration of our trademarks and service marks in the United States and certain jurisdictions outside the United States to establish and protect our brand names as part of our intellectual property strategy. The laws of some countries do not protect intellectual property and other proprietary rights to the same extent as the laws of the United States. Our exposure to unauthorized copying, transfer and use of our proprietary technology or information may increase as we expand our international operations. We cannot assure you that our pending or future trademark applications will be approved. Although we anticipate that we would be given an opportunity to respond to any such rejections, we may be unable to overcome any such rejections. In addition, in proceedings before the U.S. Patent and Trademark Office third parties are given an opportunity to oppose pending trademark applications and seek to cancel registered trademarks. Opposition or cancellation proceedings may be filed against our trademarks, and our trademarks may not survive such proceedings. In the event that our trademarks are successfully challenged, we could be forced to rebrand our services, which could result in loss of brand name recognition. Moreover, successful opposition to our applications might encourage third parties to make additional oppositions or commence trademark infringement proceedings against us, which could be costly and time consuming to defend against. If we decide to take limited or no action to protect our trademarks, our trademark rights may be diluted and subject to challenge or invalidation, which could materially and adversely affect our brand in the marketplace. Certain of the trademarks we may use may become so well known by the public that their use becomes generic and they lose trademark protection. Over the long term, if we are unable to establish name recognition based on our trademark and tradenames, then we may not be able to compete effectively and our business may be adversely affected. Further, we cannot assure you that competitors will not infringe our trademarks or that we will have adequate resources to enforce our trademarks.

We are subject to litigation in the ordinary course of business, and uninsured judgments or a rise in insurance premiums may adversely affect our results of operations.

In the ordinary course of business, we are subject to various claims and litigation. Any such claims, regardless of merit, could be time-consuming and expensive to defend and could divert management’s attention and resources. In accordance with customary practice, we maintain insurance against some, but not all, of these potential claims. We may

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elect not to obtain insurance if we believe that the cost of available insurance is excessive relative to the risks presented. The levels of insurance we maintain may not be adequate to fully cover any and all losses or liabilities. Further, we may not be able to maintain insurance at commercially acceptable premium levels or at all. If any significant judgment, claim (or a series of claims) or other event is not fully insured or indemnified against, it could have a material adverse impact on our business, financial condition and results of operations. There can be no assurance as to the actual amount of these liabilities or the timing thereof. We cannot be certain that the outcome of current or future litigation will not have a material adverse impact on our business and results of operations.

We may be liable for the information that content owners or distributors distribute over our network.

The law relating to the liability of private network operators for information carried on or disseminated through their networks remains unsettled. While we disclaim any liability for third-party content in our services agreements, we may become subject to legal claims relating to the content disseminated on our network, even though such content is owned or distributed by our customers or a customer of our customers. For example, lawsuits may be brought against us claiming that material distributed using our network was inaccurate, offensive or violated the law or the rights of others. Claims could also involve matters such as defamation, invasion of privacy and copyright infringement. In addition, the law remains unclear over whether content may be distributed from one jurisdiction, where the content is legal, into another jurisdiction, where it is not. Companies operating private networks have been sued in the past, sometimes successfully, based on the nature of material distributed, even if the content is not owned by the network operator and the network operator has no knowledge of the content or its legality. It is not practical for us to monitor all of the content distributed using our network. We may need to take costly measures to reduce our exposure to these risks or to defend ourselves against such claims, which could adversely affect our results of operations and financial condition.

Third parties may fraudulently use our name to obtain access to customer accounts and other personal information, use our services to commit fraud or steal our services, which could damage our reputation, limit our growth or cause us to incur additional expenses.

Our customers may have been subject to “phishing,” which occurs when a third party calls or sends an email or pop-up message to a customer that claims to be from a business or organization that provides services to the customer. The purpose of the inquiry is typically to encourage the customer to visit a bogus website designed to look like a website operated by the legitimate business or organization or provide information to the operator. At the bogus website, the operator attempts to trick the customer into divulging customer account or other personal information such as credit card information or to introduce viruses through “Trojan horse” programs to the customers’ computers. This could result in identity theft from our customers and the unauthorized use of our services. Third parties also have used our communications services to commit fraud. If we are unable to detect and prevent “phishing” and other similar methods, use of our services for fraud and similar activities, our brand reputation and growth may suffer and we may incur additional costs, including costs to increase security, or be required to credit significant amounts to customers.

Third parties also have used our communications services without paying, including by submitting fraudulent credit information and fraudulent credit card information. This has resulted in our incurring the cost of providing the services, including incurring call termination fees, without any corresponding revenue. We have implemented anti-fraud procedures in order to limit the expenses resulting from theft of service. If our procedures are not effective, theft of service could significantly increase our expenses and adversely affect our business, results of operations and financial condition.

If our customers or their end users do not accept the differences between our service and traditional telephone service, they may choose to remain with their current telephone service provider or may choose to return to service provided by traditional network service providers.

Aspects of our services based on VoIP, including our communications platform, are not the same as traditional network service providers. Our continued growth is dependent on the adoption of our services by mainstream customers and their end users, so these differences are important. For example:

•Our 911 calling and other emergency calling services are different, in significant respects, from the 911 and other emergency calling services associated with traditional wireline and wireless telephone providers and, in certain cases, with other VoIP providers.

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•In the event of a power loss or Internet access interruption experienced by a customer, our service may be interrupted.

•Our customers’ end users may experience lower call quality than they are used to from traditional wireline or wireless telephone companies, including static, echoes and delays in transmissions.

•Our customers’ end users may not be able to call premium-rate telephone numbers such as 1-900 numbers and 976 numbers.

We may lose customers if we experience failures of our system or communications platform that significantly disrupt the availability and quality of the services that we provide. Such failures may also cause interruptions to service delivery and the completion of other corporate functions.

Our operations depend on our ability to limit and mitigate interruptions or degradation in service for customers. Interruptions in service or performance problems, for whatever reason, could undermine our customers’ confidence in our services and cause us to lose customers or make it more difficult to attract new ones. Because many of our services are critical to the businesses or daily lives of many of our customers or our customers’ end users, any significant interruption or degradation in service also could result in lost profits or other losses to customers. Although our service agreements generally limit our liability for service failures and generally exclude any liability for “consequential” damages such as lost profits, a court might not enforce these limitations on liability, which could expose us to financial loss. We also sometimes provide our customers with committed service levels. If we fail to meet these committed service levels, we could be required to provide service credits or other compensation to our customers, which could adversely affect our results of operations.

The failure of any equipment or facility on our network, including our network operations control centers and network data storage locations, could interrupt customer service and other corporate functions until we complete necessary repairs or install replacement equipment. Our business continuity plans also may be inadequate to address a particular failure that we experience. Delays, errors or network equipment or facility failures could result from natural disasters, pandemics such as COVID-19, disease, accidents, terrorist acts, power losses, security breaches, vandalism or other illegal acts, computer viruses or other causes. These delays, errors or failures could significantly impair our business due to:

•service interruptions;

•malfunction of our communications platform on which our enterprise users rely for voice, messaging or emergency service functionality;

•exposure to customer liability;

•the inability to install new service;

•the unavailability of employees necessary to provide services;

•the delay in the completion of other corporate functions such as issuing bills and the preparation of financial statements; or

•the need for expensive modifications to our systems and infrastructure.

Defects or errors in our services could diminish demand for our services, harm our business and results of operations and subject us to liability.

Our customers use our services for important aspects of their businesses, and any errors, defects or disruptions to our services and any other performance problems with our services could damage our customers’ businesses and, in turn, hurt our brand and reputation. We provide regular updates to our services, which have in the past contained, and may in the future contain, undetected errors, failures, vulnerabilities and bugs when first introduced or released. Real or perceived errors, failures or bugs in our services could result in negative publicity, loss of or delay in market acceptance of our platform, loss of competitive position, lower customer retention or claims by customers for losses sustained by them. In such an event, we may be required, or may choose, for customer relations or other reasons, to expend additional resources

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in order to help correct the problem. In addition, we may not carry insurance sufficient to compensate us for any losses that may result from claims arising from defects or disruptions in our services. As a result, our brand and reputation could be harmed, and our business, results of operations and financial condition may be adversely affected.

If our emergency services do not function properly, we may be exposed to significant liability from our users.

Certain of our IP telephony offerings, as well as the 911 and other emergency services solutions that we offer are subject to FCC and other rules governing the delivery of emergency calling services. Similar to other providers of IP telephony services, our 911 and other emergency services are different from those associated with traditional local telecommunications services. These differences may lead to an inability to make and complete calls that would not occur for users of traditional telephony services. For example, to provide the emergency calling services required by the FCC’s rules to our IP telephony consumers, we may use components of both the wireline and wireless infrastructure in unique ways that can result in failed connections and calls routed to incorrect emergency call centers. Routing emergency calls over the Internet may be adversely affected by power outages and network congestion that may not occur for users of traditional telephony services. Emergency call centers may not be equipped with appropriate hardware or software to accurately process and respond to emergency calls initiated by consumers of our IP telephony services, and calls routed to the incorrect emergency call center can significantly delay response times for first responders. Users of our interconnected VoIP telephony services from a fixed address in the United States are required to manually update their location information for use when calling 911, and failure to do so may result in dispatching of assistance to the wrong location. Even manual updates made appropriately require a certain amount of time before the updated address appears in the relevant databases which could result in misrouting emergency calls to the wrong emergency calling center, dispatching first responders to the wrong address, or both. Similar requirements and delays applicable to relevant databases also apply to local emergency services provided outside the United States. Moreover, the relevant rules with respect to what address information should be provided to emergency call centers when the call originates from a mobile application are unsettled. As a result, we could be subject to enforcement action by the FCC or other entities — possibly exposing us to significant monetary penalties, cease and desist orders, civil liability, loss of user confidence in our services, loss of users, and other adverse consequences, which could materially harm our business. The FCC’s rules, and some states, also impose other obligations on us, such as properly recording our customers’ registered locations, obtaining affirmative acknowledgement from customers that they are aware of the differences between emergency calling services associated with IP telephony as compared with traditional telecommunications services, and distribution of appropriate warning labels to place on or near hardware used to place IP telephony calls. Similar obligations apply to local emergency services provided outside the United States. Failure to comply with these requirements, or failure of our communications platform such that 911 and other emergency calls did not complete or were misrouted, may result in FCC, foreign regulatory or other enforcement action, state attorneys’ general investigations, potential exposure to significant monetary penalties, cease and desist orders, civil liability to our users and their customers, loss of user confidence in our services, loss of users, and other adverse consequences, which could materially harm our business.

National regulations, including the FCC’s rules, also require that we timely report certain 911 and other emergency service outages. The FCC or other applicable regulatory authorities may make inquiries regarding matters related to any reported 911 or other emergency service outage. Any inquiry could result in regulatory enforcement action, potential monetary penalties and other adverse consequences.

Termination of relationships with key suppliers could cause delay and additional costs.

Our business is dependent on third-party suppliers for fiber, computers, software, transmission electronics and related network components, as well as providers of network colocation facilities that are integrated into our network, some of which are critical to the operation of our business. If any of these critical relationships is terminated, a supplier either exits or curtails its business as a result of economic conditions, a supplier fails to provide critical services or equipment, or the supplier is forced to stop providing services due to legal constraints, such as patent infringement, and we are unable to reach suitable alternative arrangements quickly, we may experience significant additional costs or we may not be able to provide certain services to customers. If that happens, our business, results of operations and financial condition could be materially adversely affected.

Many of our third-party suppliers do not have long-term committed contracts with us and may interrupt services or terminate their agreements with us without notice or by providing 30 days prior written notice. Although we expect that

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we could receive similar services from other third-party suppliers, if any of our arrangements with our third-party suppliers are terminated or interrupted, we could experience interruptions in our ability to make our services available to customers, as well as delays and additional expenses in arranging alternative providers. If a significant portion of our third-party suppliers fail to provide these services to us on a cost-effective basis or otherwise terminate or interrupt these services, the delay caused by qualifying and switching to other providers could be time consuming and costly and could adversely affect our business, results of operations and financial condition.

One of our third-party suppliers, Level 3, provides us with certain 911 call routing and termination services. Level 3 is our preferred provider for these services pursuant to an agreement that automatically renews for consecutive one-year periods, unless terminated by either Level 3 or us. Level 3 may cancel the agreement upon two years’ notice and we may cancel the agreement upon one year’s notice. If our agreement with Level 3 terminates for any reason other than our default, Level 3 must continue to provide these services to us for at least two years to allow us to transition to another provider. We are obligated to pay Level 3 a minimum of $100,000 per month for as long as the agreement continues. Additionally, Level 3 has a right of first refusal to provide these 911 call routing and termination services to us in additional geographic areas.

Our growth and financial health are subject to a number of economic risks.

The financial markets in the United States have experienced substantial uncertainty during recent years, particularly following the COVID-19 outbreak. This uncertainty has included, among other things, extreme volatility in securities prices, drastically reduced liquidity and credit availability, rating downgrades of certain investments and declining values with respect to others. If capital and credit markets continue to experience uncertainty and available funds remain limited, we may not be able to obtain debt or equity financing or to refinance our existing indebtedness on favorable terms or at all, which could affect our strategic operations and our financial performance and force modifications to our operations. These conditions currently have not precluded us from accessing credit markets or financing our operations, but there can be no assurance that financial markets and confidence in major economies will not deteriorate. An extended period of economic deterioration could materially adversely affect our results of operations and financial condition and exacerbate some of the other risk factors contained in this offering memorandum. For example, our customers might defer or entirely decline purchases of our services due to tighter credit or negative financial news or reduce demand for our services. Our customers also may not be able to obtain adequate credit, which could adversely affect the timeliness of their payments to us or ultimately result in a filing by the customer for protection from creditors under applicable insolvency or bankruptcy laws. If our customers cannot make timely payments to us, our accounts receivable could increase. The demand for, and the prices of, our services also may decline due to the actions of our competitors or otherwise.

Key vendors upon which we rely also could be unwilling or unable to provide us with the materials or services that we need to operate our communications platform or otherwise on a timely basis or on terms that we find acceptable. Our financial counterparties, insurance providers or others also may default on their contractual obligations to us. If any of our key vendors fail, we may not be able to replace them without disruptions to, or deterioration of, our services and we also may incur higher costs associated with new vendors. Transitioning to new vendors also may result in the loss of the value of assets associated with our integration of third-party services into our network or service offerings.

Our customer churn rate may increase.

Customer churn occurs when a customer discontinues service with us, whether voluntarily or involuntarily, such as a customer switching to a competitor or going out of business. Changes in the economy, increased competition from other providers, or issues with the quality of service we deliver can impact our customer churn rate. We cannot predict future pricing by our competitors, but we anticipate that price competition will continue. Lower prices offered by our competitors could contribute to an increase in customer churn. We cannot predict the timing, duration or magnitude of any deteriorated economic conditions or its impact on our target of customers. Higher customer churn rates could adversely affect our revenue growth. Higher customer churn rates could cause our dollar-based net retention rate to decline. A sustained and significant growth in the churn rate could have a material adverse effect on our business.

The market prices for certain of our services have decreased in the past and may decrease in the future, resulting in lower revenue than we anticipate.

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Market prices for certain of our services have decreased over recent years. These decreases resulted from downward market pressure and other factors including:

•technological changes and network expansions, which have resulted in increased transmission capacity available for sale by us and by our competitors; and

•some of our competitors have been willing to accept smaller operating margins in the short term in an attempt to increase long-term revenue.

To retain customers and revenue, we must sometimes reduce prices in response to market conditions and trends. We cannot predict to what extent we may need to reduce our prices to remain competitive or whether we will be able to sustain future pricing levels as our competitors introduce competing services or similar services at lower prices. Our ability to meet price competition may depend on our ability to operate at costs equal to or lower than our competitors or potential competitors. As our prices for some of our services decrease, our operating results may suffer unless we are able to either reduce our operating expenses or increase traffic volume from which we can derive additional revenue.

The need to obtain additional IP circuits from other providers increases our costs. In addition, the need to interconnect our network to networks that are controlled by others could increase our costs.

We lease all of our IP circuits from third parties. We could incur material expenses if we were required to locate alternative IP circuits. We may not be able to obtain reasonable alternative IP circuits if needed. Failure to obtain usage of alternative IP circuits, if necessary, could have a material adverse effect on our ability to carry on business operations. In addition, some of our agreements with other providers require the payment of amounts for services whether or not those services are used. Our reliance on third-party providers may reduce our operating flexibility, ability to make timely service changes and ability to control quality of service.

In the normal course of business, we need to enter into interconnection agreements with many local telephone companies, as well as the owners of networks that our customers desire to access to deliver their services. We are not always able to secure these interconnection agreements on favorable terms. In some jurisdictions, we rely on third party access and networks for local connectivity. We are not always able to secure this access and local connectivity on favorable terms. Costs of obtaining service from other communications carriers comprise a significant proportion of the operating expenses of long distance carriers. Changes in regulation, particularly the regulation of telecommunication carriers and local access network owners, could indirectly, but significantly, affect our competitive position. These changes could increase or decrease the costs of providing our services. Further, if problems occur with our third-party providers or local telephone companies, it may cause errors or poor quality communications, and we could encounter difficulties identifying the source of the problem. The occurrence of errors or poor quality communications on our services, whether caused by our platform or a third-party provider, may result in the loss of our existing customers or the delay of adoption of our services by potential customers and may adversely affect our business, results of operations and financial condition.

Network providers also may institute additional fees due to regulatory, competitive or other industry-related changes that increase our costs. For example, in February 2020, a major U.S. cellular carrier introduced a new service offering for Application to Person (“A2P”) messages that adds a new fee for A2P messages delivered to its subscribers. Other cellular carriers may introduce similar fees. While we may be able to negotiate with network providers, absorb the increased costs, or charge these costs to our customers, we cannot assure you that we will be able to do so. In the case of new A2P fees, we currently pass, and expect to continue to pass, these fees on to our customers who send A2P messages to the carrier's subscribers. This is expected to increase our revenue and cost of goods sold, but is not expected to impact the gross profit received for sending these messages. However, these changes may still have a negative impact on our gross margins mathematically. We also may not be able to effectively respond to any new fees if all network providers in a particular market impose equivalent fee structures, if the magnitude of the fees is disproportionately large when compared to the underlying prices paid by our customers, or if the market conditions limit our ability to increase the prices we charge our customers.

We depend largely on the continued services of our senior management and other key employees, the loss of any of whom could adversely affect our business, results of operations and financial condition.

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Our future performance depends on the continued services and contributions of our senior management and other key employees to execute on our business plan, to develop our platform, to deliver our services to customers, to attract and retain customers and to identify and pursue opportunities. The loss of services of senior management or other key employees, such as those who develop and maintain our service offerings, could significantly delay or prevent the achievement of our development and strategic objectives. In particular, we depend to a considerable degree on the vision, skills, experience and effort of our Co-Founder, Chief Executive Officer and Chairman, David A. Morken. The replacement of any of our senior management personnel or other key employees would likely involve significant time and costs, and such loss could significantly delay or prevent the achievement of our business objectives. The loss of the services of our senior management or other key employees for any reason could adversely affect our business, results of operations and financial condition.

If we are unable to hire, retain and motivate qualified personnel, our business will suffer.

Our future success depends, in part, on our ability to continue to attract and retain highly skilled personnel. We are currently experiencing voluntary attrition at a rate that exceeds our historical average. We believe that there is, and will continue to be, intense competition for highly skilled management, technical, sales and other personnel with experience in our industry in the Raleigh, North Carolina area, where our headquarters are located, and in other locations where we maintain offices. We must provide competitive compensation packages and a high-quality work environment to hire, retain and motivate employees. If we are unable to retain and motivate our existing employees and attract qualified personnel to fill key positions, we may be unable to manage our business effectively, including the development, marketing and sale of our services, which could adversely affect our business, results of operations and financial condition. To the extent we hire personnel from competitors, we also may be subject to allegations that they have been improperly solicited or hired, or that they divulged proprietary or other confidential information.

Volatility in, or lack of performance of, our stock price may also affect our ability to attract and retain key personnel. Employees may be more likely to terminate their employment with us if the shares they own or the shares underlying any vested options or restricted stock units have significantly appreciated in value, or, conversely, if the exercise prices of any options that they hold are significantly above the trading price of our Class A common stock or the value of any restricted stock units they hold has depreciated significantly. If we are unable to retain our employees, our business, results of operations and financial condition could be adversely affected.

We could be subject to liability for historic and future sales, use and similar taxes, which could adversely affect our results of operations.

We conduct operations in many tax jurisdictions throughout the United States and internationally. In many of these jurisdictions, non-income-based taxes such as sales, use and telecommunications taxes, including those associated with (or potentially associated with) VoIP telephony services or 911 services, are or may be assessed on our operations. We also face exposure to other non-income-based international taxes such as value added taxes that are or may be assessed on our operations. The systems and procedures necessary to comply in these jurisdictions are complex to develop and challenging to implement. Additionally, we rely heavily on third parties to provide us with key software and services for compliance. If these third parties cease to provide those services to us for any reason, or fail to perform services accurately and completely, we may not be able to accurately bill, collect or remit applicable non-income-based taxes. Historically, we have not billed or collected certain of these taxes and, in accordance with GAAP, we have recorded a provision for our tax exposure in these jurisdictions when it is both probable that a liability has been incurred and the amount of the exposure can be reasonably estimated. These estimates include several key assumptions including, but not limited to, the taxability of our services, the jurisdictions in which we believe we have nexus, and the sourcing of revenue to those jurisdictions. In the event these jurisdictions challenge our assumptions and analysis, our actual exposure could differ materially from our current estimates.

Taxing authorities also may periodically perform audits to verify compliance and include all periods that remain open under applicable law, which customarily range from three to four years. At any point in time, we may undergo audits that could result in significant assessments of past taxes, fines and interest if we were found to be non-compliant. During the course of an audit, a taxing authority may, as a matter of policy, question our interpretation and/or application of their rules in a manner that, if we were not successful in substantiating our position, could potentially result in a significant financial impact to us.

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Furthermore, certain jurisdictions in which we do not collect sales, use and similar taxes may assert that such taxes are applicable, which could result in tax assessments, penalties and interest, and we may be required to collect such taxes in the future. Such tax assessments, penalties and interest or future requirements may adversely affect our business, results of operations and financial condition.

We conduct our international operations through subsidiaries and report our taxable income in various jurisdictions worldwide based upon our business operations in those jurisdictions. Our intercompany relationships are subject to complex transfer pricing regulations administered by taxing authorities in various jurisdictions. Also, our tax expense could be affected depending on the applicability of withholding and other taxes under the tax laws of certain jurisdictions in which we have business operations. The relevant revenue and taxing authorities may disagree with positions we have taken generally, or our determinations as to income and expenses attributable to specific jurisdictions. If such a disagreement were to occur, and our position were not sustained, we could be required to pay additional taxes, interest and penalties, which could result in one-time tax charges, higher effective tax rates, reduced cash flows and lower overall profitability of our operations.

We may be subject to significant U.S. federal income tax-related liabilities and indemnity obligations if there is a determination that the Spin-Off is taxable for U.S. federal income tax purposes.

We may be subject to significant U.S. federal income tax-related liabilities with respect to our prior distribution of all of the issued and outstanding shares of the common stock of Relay, Inc. (f/k/a Republic Wireless, Inc.) (“Relay”), our former subsidiary, to our stockholders as of and on November 30, 2016 (the “Spin-Off”), if there is a determination that the Spin-Off is taxable for U.S. federal income tax purposes. In that regard, even if the Spin-Off otherwise qualified as a tax-free transaction to us and our stockholders under Section 355, Section 368(a)(1)(D) and related provisions of the U.S. Internal Revenue Code of 1986, as amended (the “Code”) at the time of the Spin-Off, we would be subject to corporate-level taxable gain under Section 355(e) of the Code (“Section 355(e)”) if there was a 50% or greater change in ownership, by vote or value, of shares of our stock or Relay’s stock that occurred after the Spin-Off as part of a plan or series of related transactions that included the Spin-Off. For purposes of Section 355(e), any acquisitions or issuances of our stock, including pursuant to our initial public offering and pursuant to the reorganizations undertaken and arrangements entered into in connection with our initial public offering, or Relay’s stock, in each case, that occurred within two years after the Spin-Off are generally presumed to be part of a plan or series of related transactions with respect to the Spin-Off.

In connection with the Spin-Off, we received an opinion from Skadden, Arps, Slate, Meagher & Flom LLP substantially to the effect that, among other things, the Spin-Off should qualify as a tax-free transaction for U.S. federal income tax purposes under Section 355 and Section 368(a)(1)(D) of the Code. In addition, in light of the implications that would arise for us if Section 355(e) applied to the Spin-Off, we received an opinion from Kilpatrick Townsend & Stockton LLP in connection with our initial public offering substantially to the effect that (i) as of the date of the initial public offering, we would not be required to recognize gain with respect to the Spin-Off pursuant to Section 355(e), and (ii) any increases in voting power attributable to conversions of our Class B common stock to Class A common stock by those who held our Class B common stock as of the date of the initial public offering would not cause us to recognize gain with respect to the Spin-Off pursuant to Section 355(e) (together with the opinion from Skadden, Arps, Slate, Meagher & Flom LLP with respect to the Spin-Off, the “Tax Opinions”). Neither of the Tax Opinions is binding on the Internal Revenue Service (the “IRS”) or the courts, however, and the IRS or the courts may not agree with the conclusions reached in the Tax Opinions. Moreover, the Tax Opinions were based upon, among other things, the laws in effect at the time of each of the Tax Opinions and certain assumptions and representations as to factual matters made by us. Any change in applicable law, which may be retroactive, or the failure of any such assumptions or representations to be true, could adversely affect the validity of the conclusions reached in the Tax Opinions.

If the conclusions of the Tax Opinions are not correct, or if the Spin-Off is otherwise ultimately determined to be a taxable transaction, we would be liable for significant U.S. federal income tax related liabilities. In addition, pursuant to the Tax Sharing Agreement, dated November 30, 2016, between us and Relay (the “Tax Sharing Agreement”), we must generally indemnify Relay for any taxes or losses incurred by it (or its respective subsidiaries) resulting from the Spin-Off failing to qualify as a tax-free transaction for U.S. federal income tax purposes (including due to the application of Section 355(e)) as a result of subsequent actions we take or fail to take. The amount of any indemnity obligations we may have under the Tax Sharing Agreement in such case may be material.

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Even if Section 355(e) does not apply to the Spin-Off as of the date of our initial public offering or as a result of an increase in voting power attributable to conversions of our Class B common stock by those who held such stock as of our initial public offering, subsequent acquisitions or issuances of our stock could be treated as part of a plan or series of related transactions with respect to the Spin-Off. Accordingly, in light of the requirements of Section 355(e), we might forego share repurchases, stock issuances and other strategic transactions. Notwithstanding the foregoing, it is possible that we, Relay or the holders of our respective stock might inadvertently cause, permit or otherwise not prevent a change in the ownership of our stock or Relay’s stock to occur, which would cause Section 355(e) to apply to the Spin-Off, thereby triggering significant U.S. federal income tax-related liabilities and indemnity obligations under the Tax Sharing Agreement of approximately $50 million. This approximation is based on our current expectations and the tax laws in effect as of our initial public offering. However, we cannot provide any assurance that this estimate will prove to be accurate in the event that Section 355(e) were to apply.

If our estimates or judgments relating to our critical accounting policies prove to be incorrect, our results of operations could be adversely affected.

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances, as provided in “Management’s Discussion and Analysis of Financial Condition and Results of Operations.” The results of these estimates form the basis for making judgments about the carrying values of assets, liabilities and equity, and the amount of revenue and expenses that are not readily apparent from other sources. Significant assumptions and estimates used in preparing our condensed consolidated financial statements include those related to revenue recognition, capitalized internal-use software costs, other non-income taxes, business combination and valuation of goodwill and purchased intangible assets and share-based compensation. Our results of operations may be adversely affected if our assumptions change or if actual circumstances differ from those in our assumptions, which could cause our results of operations to fall below the expectations of securities analysts and investors, resulting in a decline in the trading price of our Class A common stock.

If we fail to maintain an effective system of disclosure controls and internal control over financial reporting, our ability to produce timely and accurate financial statements or comply with applicable regulations could be impaired.

We are subject to the reporting requirements of the Exchange Act, the Sarbanes-Oxley Act of 2002 (the “Sarbanes-Oxley Act”), and the rules and regulations of the applicable listing standards of the NASDAQ Global Select Market. We expect that the requirements of these rules and regulations will continue to increase our legal, accounting and financial compliance costs, make some activities more difficult, time-consuming and costly and place significant strain on our personnel, systems and resources.

The Sarbanes-Oxley Act requires, among other things, that we maintain effective disclosure controls and procedures and internal control over financial reporting. Our disclosure controls and other procedures are designed to ensure that information required to be disclosed by us in the reports that we will file with the SEC is recorded, processed, summarized and reported within the time periods specified in SEC rules and forms and that information required to be disclosed in reports under the Exchange Act is accumulated and communicated to our principal executive and financial officers, and we continue to evaluate how to improve controls. We are also continuing to improve our internal control over financial reporting. In order to develop, maintain and improve the effectiveness of our disclosure controls and procedures and internal control over financial reporting, we have expended, and anticipate that we will continue to expend, significant resources, including accounting-related costs and significant management oversight.

Our current controls and any new controls that we develop may become inadequate because of changes in conditions in our business. Further, weaknesses in our disclosure controls and internal control over financial reporting may be discovered in the future. Any failure to develop or maintain effective controls or any difficulties encountered in their implementation or improvement could harm our results of operations or cause us to fail to meet our reporting obligations and may result in a restatement of our consolidated financial statements for prior periods. Any failure to implement and maintain effective internal control over financial reporting could also adversely affect the results of periodic management evaluations and annual independent registered public accounting firm attestation reports regarding the effectiveness of our internal control over financial reporting. Ineffective disclosure controls and procedures and

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internal control over financial reporting could also cause investors to lose confidence in our reported financial and other information, which would likely have a negative effect on the trading price of our Class A common stock. In addition, if we are unable to continue to meet these requirements, we may not be able to remain listed on the NASDAQ Global Select Market.

Our independent registered public accounting firm is required to attest to the effectiveness of our internal control over financial reporting. Our independent registered public accounting firm may issue a report that is adverse in the event it is not satisfied with the level at which our internal control over financial reporting is documented, designed or operating. Any failure to maintain effective disclosure controls and internal control over financial reporting could have a material and adverse effect on our business, results of operations and financial condition and could cause a decline in the trading price of our Class A common stock.

If our goodwill or intangible assets become impaired, we may be required to record a significant charge to earnings.

We review our intangible assets for impairment when events or changes in circumstances indicate the carrying value may not be recoverable. Goodwill is required to be tested for impairment at least annually. An adverse change in market conditions, particularly if such change has the effect of changing one of our critical assumptions or estimates, could result in a change to the estimation of fair value that could result in an impairment charge to our goodwill or intangible assets. Any such charges may adversely affect our results of operations.

Earthquakes, hurricanes, fires, floods, pandemics, power outages, terrorist attacks and other significant events could disrupt our business and ability to serve our clients.

A significant event, such as an earthquake, hurricane, a fire, a flood, a pandemic or a power outage, could have a material adverse effect on our business, results of operations or financial condition. For example, the rapid and global spread of COVID-19 has disrupted businesses and increased travel restrictions. Health concerns or governmental, legal, political or regulatory developments in the United States or other countries in which we or our customers, partners and service providers operate could cause economic, labor or social instability and could materially adversely affect our business and our results of operations and financial condition. Future developments, which are very uncertain, include changing information about the extent and severity of COVID-19 and evolving responses by governments and businesses. These future developments could materially adversely affect our business and our results of operations and financial condition. Our IP network is designed to be redundant and to offer seamless backup support in an emergency. While our network is designed to withstand the loss of any one data center at any point in time, the simultaneous failure of multiple data centers could disrupt our ability to serve our clients. Additionally, certain of our capabilities cannot be made redundant feasibly or cost-effectively. Acts of physical or cyber terrorism or other geopolitical unrest also could cause disruptions in our business. The adverse impacts of these risks may increase if our disaster recovery plans prove to be inadequate.

We may acquire or invest in companies, which may divert our management’s attention and result in debt or dilution to our stockholders. We may not be able to efficiently and effectively integrate acquired operations, and thus may not fully realize the anticipated benefits from such acquisitions.

We may evaluate and consider potential strategic transactions, including acquisitions of, or investments in, businesses, technologies, services, products and other assets in the future. We may also enter into relationships with other businesses to expand our products and platform, which could involve preferred or exclusive licenses, additional channels of distribution, discount pricing or investments in other companies.

Achieving the anticipated benefits of any acquisitions depends in part upon whether we can integrate new businesses in an efficient and effective manner. The integration of any acquired businesses involves a number of risks, including, but not limited to:

•demands on management related to any significant increase in size after the acquisition;

•the disruption of ongoing business and the diversion of management’s attention from the management of daily operations to management of integration activities;

•failure to fully achieve expected synergies and costs savings;

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•unanticipated impediments in the integration of departments, systems, including accounting systems, technologies, books and records and procedures, as well as in maintaining uniform standards, controls, including internal control over financial reporting required by the Sarbanes-Oxley Act, procedures and policies;

•difficulty establishing and maintaining appropriate governance, reporting relationships, policies, controls, and procedures for the acquired business, particularly if it is based in a country or region where we did not previously operate;

•new or more stringent regulatory compliance obligations and costs by virtue of the acquisition, including risks related to international acquisitions that may operate in new jurisdictions or geographic areas where we may have no or limited experience;

•loss of customers or the failure of customers to order incremental services that we expect them to order;

•difficulty and delays in integrating the products, technology platforms, operations, systems, and personnel of the acquired business with our own, particularly if the acquired business is outside of our core competencies and current geographic markets;

•failure to provision services that are ordered by customers during the integration period;

•higher integration costs than anticipated;

•difficulties in the assimilation and retention of highly qualified, experienced employees, many of whom may be geographically dispersed;

•litigation, investigations, proceedings, fines, or penalties arising from or relating to the transaction or the acquired business, and any resulting liabilities may exceed our forecasts;

•acquisition of businesses with different revenue models, different contractual relationships, and increased customer concentration risks;

•assumption of long-term contractual obligations, commitments, or liabilities (for example, the costs associated with leased facilities), which could adversely impact our efforts to achieve and maintain profitability and impair our cash flow;

•failure to successfully evaluate or utilize the acquired business’ technology and accurately forecast the financial impact of an acquisition, including accounting charges; and

•drag on our overall revenue growth rate or an increase of our net loss, which could cause analysts and investors to reduce their valuation of our company.

Successful integration of any acquired businesses or operations will depend on our ability to manage these operations, realize opportunities for revenue growth presented by strengthened service offerings and expanded geographic market coverage, obtain better terms from our vendors due to increased buying power, and eliminate redundant and excess costs to fully realize the expected synergies. Because of difficulties in combining geographically distant operations and systems which may not be fully compatible, we may not be able to achieve the financial strength and growth we anticipate from the acquisitions.

We may not realize our anticipated benefits from our acquisitions, if any, or may be unable to efficiently and effectively integrate acquired operations as planned. If we fail to integrate acquired businesses and operations efficiently and effectively or fail to realize the benefits we anticipate, we would be likely to experience material adverse effects on our business, financial condition, results of operations and future prospects.

Any acquisitions may also require us to issue debt or equity securities, use our cash resources, incur debt or contingent liabilities, amortize intangibles, or write-off acquisition-related expenses. In addition, we cannot predict market reactions to any acquisitions we may make or to any failure to announce any future acquisitions.

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While we would conduct due diligence in connection with any acquisition opportunities, there may be risks or liabilities that such due diligence efforts fail to discover, that are not disclosed to us or that we inadequately assess. The failure to timely identify any material liabilities associated with any acquisitions could adversely affect our business, results of operations, and financial condition.

Risks Related to the Acquisition of Voxbone

Although we expect that the acquisition of Voxbone will result in synergies and other benefits to us, we may not realize those benefits because of difficulties related to integration, the achievement of synergies and other challenges.

On November 2, 2020, we acquired Voice Topco Limited, a private limited liability company incorporated under the laws of England and Wales (together with its subsidiaries, “Voxbone”), which directly or indirectly holds all of the issued and outstanding shares of Voxbone, S.A. a private limited liability company registered under the laws of Belgium. Prior to the completion of the Acquisition, we and Voxbone operated independently, and there can be no assurances that our businesses can be combined in a manner that allows for the achievement of substantial benefits. The integration process will require significant time and resources, and we may not be able to manage the process successfully as our ability to acquire and integrate larger or more complex companies, products, or technology in a successful manner is unproven. If we are not able to successfully integrate Voxbone’s business with ours or pursue our customer and product strategy successfully, the anticipated benefits of the Acquisition may not be realized fully or may take longer than expected to be realized. Further, it is possible that there could be a loss of our and/or Voxbone’s key employees and customers, disruption of either company’s or both companies’ ongoing businesses or unexpected issues, higher than expected costs and an overall post‑completion process that takes longer than originally anticipated. Specifically, the following issues, among others, must be addressed in combining Voxbone’s operations with ours in order to realize the anticipated benefits of the Acquisition so the combined company performs as the parties hope:

•combining the companies’ corporate functions;

•combining Voxbone’s business with our business in a manner that permits us to achieve the synergies anticipated to result from the Acquisition, the failure of which would result in the anticipated benefits of the Acquisition not being realized in the time frame currently anticipated or at all;

•maintaining existing agreements with customers, distributors, providers, talent and vendors and avoiding delays in entering into new agreements with prospective customers, distributors, providers, talent and vendors;

•determining whether and how to address possible differences in corporate cultures and management philosophies;

•integrating the companies’ administrative and information technology infrastructure;

•developing products and technology that allow value to be unlocked in the future;

•evaluating and forecasting the financial impact of the Acquisition transaction, including accounting charges; and

•effecting potential actions that may be required in connection with obtaining regulatory approvals.

At times the attention of certain members of our management and resources may be focused on integration of the businesses of the two companies and diverted from day‑to‑day business operations, which may disrupt our ongoing business and the business of the combined company.

We have incurred, and may continue to incur, significant, non‑recurring costs in connection with the Acquisition and integrating our operations with those of Voxbone, including costs to maintain employee morale and to retain key employees. Management cannot ensure that the elimination of duplicative costs or the realization of other efficiencies will offset the transaction and integration costs in the near term or at all.

Purchase price accounting in connection with the Acquisition requires estimates that may be subject to change and could impact our condensed consolidated financial statements and future results of operations and financial position.

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Pursuant to the acquisition method of accounting, the purchase price we paid for Voxbone will be allocated to the underlying Voxbone tangible and intangible assets acquired and liabilities assumed based on their respective fair market values with any excess purchase price allocated to goodwill. The acquisition method of accounting is dependent upon certain valuations and other studies that are preliminary. Accordingly, the purchase price allocation as of the Acquisition date is preliminary. We currently anticipate that all the information needed to identify and measure values assigned to the assets acquired and liabilities assumed will be obtained and finalized during the one‑year measurement period following the date of completion of the Acquisition. Differences between these preliminary estimates and the final acquisition accounting may occur, and these differences could have a material impact on the condensed consolidated financial statements and the combined company’s future results of operations and financial position.

Risks Related to the Convertible Notes and Our Indebtedness

Servicing our debt requires a significant amount of cash, and we may not have sufficient cash flow from our business to pay our indebtedness.

Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness, including the Convertible Notes, depends on our future performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not generate cash flow from operations in the future sufficient to service our debt and make necessary capital expenditures. If we are unable to generate such cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional debt financing or equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of these activities or engage in these activities on desirable terms, which could result in a default on our debt obligations. In addition, any of our future debt agreements may contain restrictive covenants that may prohibit us from adopting any of these alternatives. Our failure to comply with these covenants could result in an event of default which, if not cured or waived, could result in the acceleration of our indebtedness.

We may incur substantially more debt or take other actions which would intensify the risks discussed above.

We and our subsidiaries may be able to incur substantial additional debt in the future, subject to the restrictions contained in our debt instruments, some of which may be secured debt. We will not be restricted under the terms of the indentures governing the Convertible Notes from incurring additional debt, securing existing or future debt, recapitalizing our debt or taking a number of other actions that are not limited by the terms of the indenture governing the Convertible Notes that could have the effect of diminishing our ability to make payments on the Convertible Notes when due.

We may not have the ability to raise the funds necessary for cash settlement upon conversion of the Convertible Notes or to repurchase the Convertible Notes for cash following a fundamental change, and our future debt may contain limitations on our ability to pay cash upon conversion of the Convertible Notes or to repurchase the Convertible Notes.

Subject to limited exceptions, holders of the Convertible Notes have the right to require us to repurchase their Convertible Notes upon the occurrence of a fundamental change at a cash repurchase price generally equal to 100% of the principal amount of the Convertible Notes to be repurchased, plus accrued and unpaid interest, if any, to, but excluding, the fundamental change repurchase date. In addition, upon conversion of the Convertible Notes, unless we elect to deliver solely shares of our Class A common stock to settle such conversion (other than paying cash in lieu of delivering any fractional share), we will be required to make cash payments in respect of the Convertible Notes being converted. However, we may not have enough available cash or be able to obtain financing at the time we are required to make repurchases of Convertible Notes surrendered therefor or pay the cash amounts due upon conversion. In addition, our ability to repurchase the Convertible Notes or to pay cash upon conversions of the Convertible Notes may be limited by applicable law, by regulatory authorities or by agreements governing our future indebtedness. Our failure to repurchase the Convertible Notes at a time when such repurchase is required by the indentures governing the Convertible Notes or to pay the cash amounts due upon future conversions of the Convertible Notes as required by such indentures would constitute a default under such indentures. A default under the indentures governing the Convertible Notes or the fundamental change itself may also lead to a default under agreements governing our existing or future indebtedness, which may result in such existing or future indebtedness becoming immediately payable in full. We may not have

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sufficient funds to satisfy all amounts due under such existing or future indebtedness and repurchase the Convertible Notes or make cash payments upon conversions thereof.

The accounting method for convertible debt securities that may be settled in cash, such as the Convertible Notes, could have a material effect on our reported financial results.

In May 2008, the Financial Accounting Standards Board (“FASB”), issued FASB Staff Position No. APB 14-1, Accounting for Convertible Debt Instruments That May Be Settled in Cash Upon Conversion (Including Partial Cash Settlement), which has subsequently been codified as Accounting Standards Codification (“ASC”) 470-20, Debt with Conversion and Other Options. Under ASC 470-20, an entity must separately account for the liability and equity components of the convertible debt instruments (such as the Convertible Notes) that may be settled entirely or partially in cash upon conversion in a manner that reflects the issuer’s economic interest cost. The effect of ASC 470-20 on the accounting for the Convertible Notes is that the equity component is required to be included in the additional paid-in capital section of stockholders’ equity on our condensed consolidated balance sheet, and the value attributed to the equity component would be treated as original issue discount for purposes of accounting for the debt component of the Convertible Notes. As a result, we will be required to record a greater amount of non-cash interest expense in current periods presented as a result of the amortization of the discounted carrying value of the Convertible Notes to their face amount over the term of the Convertible Notes. We will report lower net income in our financial results because ASC 470-20 will require interest to include both the current period’s amortization of the debt discount and the instrument’s coupon interest, which could adversely affect our reported or future financial results, the trading price of our Class A common stock and the trading price of the Convertible Notes.

In addition, under certain circumstances, convertible debt instruments (such as the Convertible Notes) that may be settled entirely or partly in cash are currently accounted for utilizing the treasury stock method, the effect of which is that the shares of Class A common stock issuable upon conversion of the Convertible Notes are not included in the calculation of diluted earnings per share except to the extent that the conversion value of the Convertible Notes exceeds their principal amount. Under the treasury stock method, for diluted earnings per share purposes, the transaction is accounted for as if the number of shares of Class A common stock that would be necessary to settle such excess, if we elected to settle such excess in shares, are issued.

However, in August 2020, the FASB published an accounting standards update 2020-06 (“ASU 2020-06”), which amends these accounting standards by reducing the number of accounting models for convertible instruments and limiting instances of separate accounting for the debt and equity or a derivative component of the convertible debt instruments. ASU 2020-06 also will no longer allow the use of the treasury stock method for convertible instruments for purposes of calculating diluted earnings per share and instead require application of the “if-converted” method. Under that method, diluted earnings per share will generally be calculated assuming that all the Convertible Notes were converted solely into shares of Class A common stock at the beginning of the reporting period, unless the result would be anti-dilutive, which could adversely affect our diluted earnings per share. However, if the principal amount of the convertible debt instrument being converted is required to be paid in cash and only the excess is permitted to be settled in shares, the if-converted method will produce a similar result as the treasury stock method prior to the adoption of ASU 2020-06 for such convertible debt instrument. These amendments will be effective for public companies for fiscal years beginning after December 15, 2021, with early adoption permitted, but no earlier than fiscal years beginning after December 15, 2020.

The conditional conversion feature of the Convertible Notes, if triggered, may adversely affect our financial condition and operating results.

In the event the conditional conversion feature of the Convertible Notes is triggered, holders of Convertible Notes will be entitled to convert the Convertible Notes at any time during specified periods at their option. See “Description of Notes—Conversion Rights.” If one or more holders elect to convert their Convertible Notes, unless we elect to satisfy our conversion obligation by delivering solely shares of our Class A common stock (other than paying cash in lieu of delivering any fractional share), we would be required to settle a portion or all of our conversion obligation through the payment of cash, which could adversely affect our liquidity. In addition, even if holders do not elect to convert their Convertible Notes, we could be required under applicable accounting rules to reclassify all or a portion of the outstanding principal of the Convertible Notes as a current rather than long-term liability, which would result in a material reduction of our net working capital.

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The Capped Calls may affect the value of the Convertible Notes and our Class A common stock.

In connection with the pricing of the 2026 Convertible Notes and the 2028 Convertible Notes, we entered into privately negotiated Capped Calls with certain financial institutions (the “option counterparties”). The Capped Calls are expected generally to reduce the potential dilution upon any conversion of the Convertible Notes and/or offset any cash payments we are required to make in excess of the principal amount of converted Convertible Notes, as the case may be, with such reduction and/or offset subject to a cap.

We have been advised that, in connection with establishing their initial hedges of the Capped Calls, the option counterparties or their respective affiliates entered into various derivative transactions with respect to our Class A common stock concurrently with or shortly after the pricing of the Convertible Notes.

In addition, the option counterparties or their respective affiliates may modify their hedge positions by entering into or unwinding various derivatives with respect to our Class A common stock and/or purchasing or selling our Class A common stock or other securities of ours in secondary market transactions from time to time prior to the maturity of the Convertible Notes (and are likely to do so during any observation period related to a conversion of Convertible Notes). This activity could also cause or avoid an increase or a decrease in the market price of our Class A common stock or the Convertible Notes, which could affect your ability to convert the Convertible Notes and, to the extent the activity occurs during any observation period related to a conversion of Convertible Notes, it could affect the number of shares and value of the consideration that you will receive upon conversion of such Convertible Notes.

We do not make any representation or prediction as to the direction or magnitude of any potential effect that the transactions described above may have on the price of the Convertible Notes or our Class A common stock. In addition, we do not make any representation that the option counterparties will engage in these transactions or that these transactions, once commenced, will not be discontinued without notice.

We are subject to counterparty risk with respect to the Capped Calls.

The option counterparties are financial institutions, and we will be subject to the risk that any or all of them might default under the Capped Calls. Our exposure to the credit risk of the option counterparties will not be secured by any collateral. Past global economic conditions have resulted in the actual or perceived failure or financial difficulties of many financial institutions. If an option counterparty becomes subject to insolvency proceedings, we will become an unsecured creditor in those proceedings with a claim equal to our exposure at that time under the capped call transactions with such option counterparty. Our exposure will depend on many factors but, generally, an increase in our exposure will be correlated to an increase in the market price and in the volatility of our Class A common stock. In addition, upon a default by an option counterparty, we may suffer more dilution than we currently anticipate with respect to our Class A common stock. We can provide no assurances as to the financial stability or viability of the option counterparties.

Risks Related to Ownership of Our Class A Common Stock

The trading price of our Class A common stock may be volatile, and you could lose all or part of your investment.

Prior to our initial public offering, there was no public market for shares of our Class A common stock. On November 10, 2017, we sold shares of our Class A common stock to the public at $20.00 per share. From November 10, 2017, the date that our Class A common stock began trading on the NASDAQ Global Select Market, through September 30, 2021, the trading price of our Class A common stock has ranged from $18.05 per share to $198.61 per share. The trading price of our Class A common stock may continue to be volatile and could fluctuate significantly in response to numerous factors, many of which are beyond our control, including:

•general market volatility caused by COVID-19;

•price and volume fluctuations in the overall stock market from time to time;

•volatility in the trading prices and trading volumes of technology stocks;

•volatility in the trading volumes of our Class A common stock;

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•changes in operating performance and stock market valuations of other technology companies generally, or those in our industry in particular;

•sales of shares of our Class A common stock by us or our stockholders;

•failure of securities analysts to maintain coverage of us, changes in financial estimates by securities analysts who follow our company, or our failure to meet these estimates or the expectations of investors;

•the financial projections we may provide to the public, any changes in those projections or our failure to meet those projections;

•announcements by us or our competitors of new products or services;

•the public’s reaction to our press releases, other public announcements and filings with the SEC;

•rumors and market speculation involving us or other companies in our industry;

•actual or anticipated changes in our results of operations or fluctuations in our results of operations;

•actual or anticipated developments in our business, our competitors’ businesses or the competitive landscape generally;

•litigation involving us, our industry or both;

•regulatory actions or developments affecting our operations, those of our competitors or our industry more broadly;

•developments or disputes concerning our intellectual property or other proprietary rights;

•announced or completed acquisitions of businesses, products, services or technologies by us or our competitors;

•new laws or regulations or new interpretations of existing laws or regulations applicable to our business;

•changes in accounting standards, policies, guidelines, interpretations or principles;

•new rules adopted by certain index providers, such as S&P Dow Jones, that limit or preclude inclusion of companies with multi-class capital structures in certain of their indices;

•any significant change in our management; and

•general economic conditions and slow or negative growth of our markets.

In addition, in the past, securities class action litigation has often been instituted following periods of volatility in the overall market and the market price of a particular company’s securities. This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

Substantial future sales of shares of our Class A common stock could cause the market price of our Class A common stock to decline.

The market price of our Class A common stock could decline as a result of substantial sales of our Class A common stock, particularly sales by our directors, executive officers and significant stockholders, or the perception in the market that holders of a large number of shares intend to sell their shares.

Additionally, the shares of Class A common stock subject to outstanding options and restricted stock unit awards under our equity incentive plans and the shares reserved for future issuance under our equity incentive plans will become eligible for sale in the public market upon issuance. Certain holders of our Class A common stock have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for our stockholders or ourselves.

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The dual class structure of our common stock has the effect of concentrating voting control with those stockholders who held our capital stock prior to the completion of our initial public offering. This may limit or preclude stockholders’ ability to influence corporate matters, including the election of directors, amendments to our organizational documents and any merger, consolidation, sale of all or substantially all of our assets, or other major corporate transaction requiring stockholder approval.

Our Class A common stock has one vote per share, and our Class B common stock has ten votes per share. Because of the ten-to-one voting ratio between our Class B and Class A common stock, the holders of our Class B common stock collectively will continue to control a majority of the combined voting power of our common stock and therefore be able to control all matters submitted to our stockholders for approval. This concentrated control limits or precludes stockholders’ ability to influence corporate matters for the foreseeable future, including the election of directors, amendments to our organizational documents, and any merger, consolidation, sale of all or substantially all of our assets, or other major corporate transaction requiring stockholder approval. In addition, this may prevent or discourage unsolicited acquisition proposals or offers for our capital stock that stockholders may feel are in their best interest as one of our stockholders.

Future transfers by holders of Class B common stock will generally result in those shares converting to Class A common stock, subject to limited exceptions, such as certain transfers effected for estate planning purposes. The conversion of Class B common stock to Class A common stock will have the effect, over time, of increasing the relative voting power of those holders of Class B common stock who retain their shares in the long term.

We cannot predict the impact our capital structure may have on our stock price.

In July 2017, S&P Dow Jones, a provider of widely followed stock indices, announced that companies with multiple share classes, such as ours, will not be eligible for inclusion in certain of their indices. As a result, our Class A common stock will likely not be eligible for these stock indices. Many investment funds are precluded from investing in companies that are not included in such indices, and these funds would be unable to purchase our Class A common stock if we were not included in such indices. We cannot assure you that other stock indices will not take a similar approach to S&P Dow Jones in the future. Exclusion from indices could make our Class A common stock less attractive to investors and, as a result, the market price of our Class A common stock could be adversely affected.

In addition, several stockholder advisory firms have announced their opposition to the use of multiple class structures. As a result, the dual class structure of our common stock may cause stockholder advisory firms to publish negative commentary about our corporate governance practices or otherwise seek to cause us to change our capital structure. Any actions or publications by stockholder advisory firms critical of our corporate governance practices or capital structure could also adversely affect the value of our Class A common stock.

We may become effectively controlled by David A. Morken, our Co-Founder and Chief Executive Officer, whose interests may differ from other stockholders.

If all or substantially all of the holders of our Class B common stock except for Mr. Morken and his affiliates convert their shares into Class A common stock voluntarily or otherwise, Mr. Morken may control more than 25% of the combined voting power of our outstanding capital stock. As a result, Mr. Morken may have the ability to effectively control the appointment of our management, the entering into of mergers, sales of substantially all or all of our assets and other extraordinary transactions and influence amendments to our certificate of incorporation and bylaws. In any of these matters, the interests of Mr. Morken may differ from or conflict with your interests. Moreover, this concentration of ownership may also adversely affect the trading price for our Class A common stock to the extent investors perceive disadvantages in owning stock of a company with a controlling stockholder.

If securities or industry analysts cease publishing research or reports about us, our business or our market, or if they change their recommendations regarding our Class A common stock adversely, the trading price of our Class A common stock and trading volume could decline.

The trading market for our Class A common stock is influenced by the research and reports that securities or industry analysts may publish about us, our business, our market or our competitors. If any of the analysts who may cover us change their recommendation regarding our Class A common stock in an adverse manner, or provide more favorable

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recommendations about our competitors relative to us, the trading price of our Class A common stock would likely decline. If any analyst who covers us were to cease coverage of our company or fail to regularly publish reports on us, we could lose visibility in the financial markets, which in turn could cause the trading price of our Class A common stock or trading volume to decline.

Anti-takeover provisions contained in our second amended and restated certificate of incorporation and second amended and restated bylaws, as well as provisions of Delaware law, could impair a takeover attempt.

Our second amended and restated certificate of incorporation, second amended and restated bylaws and Delaware law contain provisions which could have the effect of rendering more difficult, delaying, or preventing an acquisition deemed undesirable by our board of directors. Among other things, our second amended and restated certificate of incorporation and second amended and restated bylaws include provisions:

•authorizing “blank check” preferred stock, which could be issued by our board of directors without stockholder approval and may contain voting, liquidation, dividend and other rights superior to our Class A and Class B common stock;

•limiting the liability of, and providing indemnification to, our directors and officers;

•limiting the ability of our stockholders to call and bring business before special meetings;

•providing for a dual class common stock structure in which holders of our Class B common stock have the ability to control the outcome of matters requiring stockholder approval, even if they own significantly less than a majority of the outstanding shares of our Class A and Class B common stock, including the election of directors and significant corporate transactions, such as a merger or other sale of our company or its assets;

•providing that our board of directors is classified into three classes of directors with staggered three-year terms;

•prohibiting stockholder action by written consent, which requires all stockholder actions to be taken at a meeting of our stockholders;

•requiring super-majority voting to amend some provisions in our second amended and restated certificate of incorporation and second amended and restated bylaws;

•requiring advance notice of stockholder proposals for business to be conducted at meetings of our stockholders and for nominations of candidates for election to our board of directors; and

•controlling the procedures for the conduct and scheduling of board of directors and stockholder meetings.

These provisions, alone or together, could delay or prevent hostile takeovers and changes in control or changes in our management.

As a Delaware corporation, we are also subject to provisions of Delaware law, including Section 203 of the Delaware General Corporation Law, which prevents certain stockholders holding more than 15% of our outstanding common stock from engaging in certain business combinations without approval of the holders of at least two-thirds of our outstanding common stock not held by such 15% or greater stockholder.

Any provision of our second amended and restated certificate of incorporation, second amended and restated bylaws or Delaware law that has the effect of delaying, preventing or deterring a change in control could limit the opportunity for our stockholders to receive a premium for their shares of our Class A common stock and could also affect the price that some investors are willing to pay for our Class A common stock.

Our second amended and restated certificate of incorporation and our second amended and restated bylaws include super-majority voting provisions that will limit your ability to influence corporate matters.

Our second amended and restated certificate of incorporation and our second amended and restated bylaws include provisions that require the affirmative vote of two-thirds of all of the outstanding shares of our capital stock

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entitled to vote to effect certain changes. These changes include amending or repealing our second amended and restated bylaws or second amended and restated certificate of incorporation or removing a director from office for cause. If all or substantially all of the holders of our Class B common stock convert their shares into Class A common stock voluntarily or otherwise, Mr. Morken may control the majority of the voting power of our outstanding capital stock, and therefore he may have the ability to prevent any such changes, which will limit a stockholder’s ability to influence corporate matters.

Our second amended and restated bylaws provide, subject to certain exceptions, that the Court of Chancery of the State of Delaware will be the sole and exclusive forum for certain stockholder litigation matters, which could limit our stockholders’ ability to obtain a favorable judicial forum for disputes with us or our directors, officers, employees or stockholders.

Our second amended and restated bylaws provide, subject to limited exceptions, that the Court of Chancery of the State of Delaware will, to the fullest extent permitted by law, be the sole and exclusive forum for (i) any derivative action or proceeding brought on our behalf; (ii) any action asserting a claim of breach of a fiduciary duty owed by any of our directors, officers or stockholder to us or our stockholders; (iii) any action asserting a claim against us that is governed by the internal affairs doctrine; or (iv) any action arising pursuant to any provision of the Delaware General Corporation Law, our second amended and restated certificate of incorporation or our second amended and restated bylaws. If a stockholder files an action within the scope of the preceding sentence in any other court than a court located in Delaware, the stockholder shall be deemed to have consented to the provisions of our second amended and restated bylaws described above. This choice of forum provision may limit a stockholder’s ability to bring a claim in a judicial forum that it finds favorable for disputes with us or any of our directors, officers, other employees or stockholders which may discourage lawsuits with respect to such claims. Alternatively, if a court were to find the choice of forum provision contained in our second amended and restated bylaws to be inapplicable or unenforceable in an action, we may incur additional costs associated with resolving such action in other jurisdictions, which could materially adversely affect our business, financial condition and results of operations.

We may need additional capital in the future and such capital may be limited or unavailable. Failure to raise capital when needed could prevent us from growing in accordance with our plans.

We may require more capital in the future from equity or debt financings to fund our operations, finance investments in equipment and infrastructure, acquire complementary businesses and technologies, and respond to competitive pressures and potential strategic opportunities. If we are required to raise additional funds through further issuances of equity or other securities convertible into equity, our existing stockholders could suffer significant dilution, and any new shares we issue could have rights, preferences or privileges senior to those of the holders of our Class A common stock. The additional capital we may seek may not be available on favorable terms or at all. If we are unable to obtain capital on favorable terms or at all, we may have to reduce our operations or forego opportunities, and this may have a material adverse effect on our business, financial condition and results of operations.

We do not intend to pay dividends for the foreseeable future.

We have never declared or paid any cash dividends on our Class A common stock and do not intend to pay any cash dividends in the foreseeable future. We anticipate that we will retain all of our future earnings for use in the development of our business and for general corporate purposes. Any determination to pay dividends in the future will be at the discretion of our board of directors. Accordingly, investors must rely on sales of their Class A common stock after price appreciation, which may never occur, as the only way to realize any future gains on their investments.

If a large number of shares of our Class A common stock is sold in the public market, the sales could reduce the trading price of our Class A common stock and impede our ability to raise future capital.

We cannot predict what effect, if any, future issuances by us of our Class A common stock will have on the market price of our Class A common stock. In addition, shares of our Class A common stock that we issue in connection with an acquisition may not be subject to resale restrictions. The market price of our Class A common stock could drop significantly if certain large holders of our Class A common stock, or recipients of our Class A common stock in connection with an acquisition, sell all or a significant portion of their shares of Class A common stock or are perceived by the market as intending to sell these shares other than in an orderly manner. In addition, these sales could impair our ability to raise capital through the sale of additional Class A common stock in the capital markets.

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Item 2. Unregistered Sales of Equity Securities and Use of Proceeds

Unregistered Sales of Equity Securities

None.

Item 6. Exhibits and Financial Statement Schedules

Exhibit Index

 

Exhibit number	Description of Exhibit	Form	File No.	Exhibit	Filing Date
3.1	Second Amended and Restated Certificate of Incorporation.	Q3 10-Q	001-38285	3.1	12/14/2017
3.2	Second Amended and Restated Bylaws.	Q3 10-Q	001-38285	3.2	12/14/2017
10.1	Forms of Global Restricted Stock Unit Grant Notice and Global Restricted Stock Unit Agreement.				Filed herewith
31.1	Certificate of the Chief Executive Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				Filed herewith
31.2	Certification of the Chief Financial Officer pursuant to Exchange Act Rules 13a-14(a) and 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.				Filed herewith
32.1*	Certification of the Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act 2002.				Furnished herewith
101.INS	XBRL Instance Document - the Instance Document does not appear in the interactive data file because its XBRL tags are embedded within the Inline XBRL Document.				Filed herewith
101.SCH	XBRL Taxonomy Schema Document.				Filed herewith
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.				Filed herewith
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.				Filed herewith
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.				Filed herewith
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.				Filed herewith

*The certifications furnished in Exhibit 32.1 hereto are deemed to accompany this Quarterly Report on Form 10-Q and will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, except to the extent that the registrant specifically incorporates it by reference.

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SIGNATURES

Pursuant to the requirements of the Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this report 10-Q to be signed on its behalf by the undersigned, thereunto duly authorized.

		BANDWIDTH INC.
Date:	November 9, 2021	By:	/s/ David A. Morken
			David A. Morken
			Chief Executive Officer
			(Principal Executive Officer)
Date:	November 9, 2021	By:	/s/ Daryl E. Raiford
			Daryl E. Raiford
			Chief Financial Officer
			(Principal Accounting and Financial Officer)

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EX-10.1

BANDWIDTH INC.

2017 INCENTIVE AWARD PLAN

GLOBAL RESTRICTED STOCK UNIT GRANT NOTICE

Capitalized terms not specifically defined in this Global Restricted Stock Unit Grant Notice (the “Grant Notice”) have the meanings given to them in the 2017 Incentive Award Plan (as amended from time to time, the “Plan”) of Bandwidth Inc. (the “Company”).

The Company has granted to the participant listed below (“Participant”) the Restricted Stock Units described in this Grant Notice (the “RSUs”), subject to the terms and conditions of the Plan and the Global Restricted Stock Unit Agreement attached as Exhibit A, including any additional terms and conditions set forth in any appendix for Participant’s country (the “Appendix” and together with the Global Restricted Stock Unit Agreement, the “Agreement”), both of which are incorporated into this Grant Notice by reference.

Participant:
Grant Date:
Number of RSUs:
Vesting Commencement Date:
Vesting Schedule:	[To be specified in individual award agreements]

By accepting (whether in writing, electronically or otherwise) the RSUs, Participant agrees to be bound by the terms of this Grant Notice, the Plan and the Agreement. Participant has reviewed the Plan, this Grant Notice and the Agreement in their entirety, has had an opportunity to obtain the advice of counsel prior to executing this Grant Notice and fully understands all provisions of the Plan, this Grant Notice and the Agreement. Participant hereby agrees to accept as binding, conclusive and final all decisions or interpretations of the Administrator upon any questions arising under the Plan, this Grant Notice or the Agreement.

BANDWIDTH INC. PARTICIPANT

By:
Name:	[Participant Name]
Title:

1

Exhibit A

EXHIBIT A

TO GLOBAL RESTRICTED STOCK UNIT AWARD GRANT NOTICE

GLOBAL RESTRICTED STOCK UNIT AGREEMENT

BANDWIDTH INC.

2017 INCENTIVE AWARD PLAN

Capitalized terms not specifically defined in this Global Restricted Stock Unit Agreement, including any additional terms and conditions for Participant’s country set forth in the Appendix hereto (together, this “Agreement”) shall have the meanings specified in the Grant Notice or, if not defined in the Grant Notice, in the Plan.

ARTICLE I.

GENERAL

1.1Award of RSUs and Dividend Equivalents.

(a)The Company has granted the RSUs to Participant effective as of the grant date set forth in the Grant Notice (the “Grant Date”). Each RSU represents the right to receive one Share or, at the option of the Company, an amount of cash, in either case, as set forth in this Agreement. Participant will have no right to the distribution of any Shares or payment of any cash until the time (if ever) the RSUs have vested.

(b)The Company hereby grants to Participant, with respect to each RSU, a Dividend Equivalent for ordinary cash dividends paid to substantially all holders of outstanding Shares with a record date after the Grant Date and prior to the date the applicable RSU is settled, forfeited or otherwise expires. Each Dividend Equivalent entitles Participant to receive the equivalent value of any such ordinary cash dividends paid on a single Share. The Company will establish a separate Dividend Equivalent bookkeeping account (a “Dividend Equivalent Account”) for each Dividend Equivalent and credit the Dividend Equivalent Account (without interest) on the applicable dividend payment date with the amount of any such cash paid.

1.2Incorporation of Terms of Plan. The RSUs are subject to the terms and conditions set forth in this Agreement and the Plan, which is incorporated herein by reference. In the event of any inconsistency between the Plan and this Agreement, the terms of the Plan will control.

1.3Unsecured Promise. The RSUs and Dividend Equivalents will at all times prior to settlement represent an unsecured Company obligation payable only from the Company’s general assets.

ARTICLE II.

VESTING; FORFEITURE AND SETTLEMENT

2.1Vesting; Forfeiture. The RSUs will vest according to the vesting schedule in the Grant Notice except that any fraction of an RSU that would otherwise be vested will be accumulated and will vest only when a whole RSU has accumulated. In the event of Participant’s Termination of Service for any reason, all unvested RSUs will immediately and automatically be cancelled and forfeited, except as otherwise determined by the Administrator or provided in a binding written agreement between Participant and the Company. Dividend Equivalents (including any Dividend Equivalent Account balance) will vest or be forfeited, as applicable, upon the vesting or forfeiture of the RSU with respect to which the Dividend Equivalent (including the Dividend Equivalent Account) relates.

2.2Settlement.

(a)RSUs and Dividend Equivalents (including any Dividend Equivalent Account balance) will be paid in Shares or cash at the Company’s option as soon as administratively practicable after the vesting of the

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applicable RSU, but in no event more than sixty (60) days after the RSU’s vesting date. Notwithstanding the foregoing, the Company may delay any payment under this Agreement that the Company reasonably determines would violate Applicable Law until the earliest date the Company reasonably determines the making of the payment will not cause such a violation (in accordance with Treasury Regulation Section 1.409A-2(b)(7)(ii)), provided the Company reasonably believes the delay will not result in the imposition of excise taxes under Section 409A.

(b)If an RSU is paid in cash, the amount of cash paid with respect to the RSU will equal the Fair Market Value of a Share on the day immediately preceding the payment date. If a Dividend Equivalent is paid in Shares, the number of Shares paid with respect to the Dividend Equivalent will equal the quotient, rounded down to the nearest whole Share, of the Dividend Equivalent Account balance divided by the Fair Market Value of a Share on the day immediately preceding the payment date.

ARTICLE III.

TAXATION AND TAX WITHHOLDING

3.1Representation. The Company is not providing any tax, legal or financial advice, nor is the Company making recommendations regarding participation in the Plan, or Participant’s acquisition or sale of the underlying Shares. Participant represents to the Company that Participant has reviewed with Participant’s own tax advisors the tax consequences of this Award and the transactions contemplated by the Grant Notice and this Agreement. Participant is relying solely on such advisors and not on any statements or representations of the Company or any of its agents.

3.2Responsibility for Taxes

(a)Participant acknowledges that, regardless of any action taken by the Company or, if different, the Subsidiary or affiliate that employs Participant or to which Participant otherwise renders services (the “Service Recipient”), the ultimate liability for all income tax, social insurance, payroll tax, fringe benefits tax, payment on account or other tax-related items related to Participant’s participation in the Plan and legally applicable or deemed applicable to Participants (“Tax-Related Items”) is and remains Participant’s responsibility and may exceed the amount (if any) actually withheld by the Company or the Service Recipient. Participant further acknowledges that the Company and/or the Service Recipient (i) make no representations or undertakings regarding the treatment of any Tax-Related Items in connection with any aspect of the RSUs, including, but not limited to, the grant, vesting or settlement of the RSUs, the subsequent sale of Shares acquired pursuant to the settlement of any RSUs and the receipt of any dividends or Dividend Equivalents; and (ii) do not commit to and are under no obligation to structure the terms of the grant or any aspect of the RSUs to reduce or eliminate Participant’s liability for Tax-Related Items or achieve any particular tax result. Further, if Participant is subject to Tax-Related Items in more than one jurisdiction, Participant acknowledges that the Company and/or the Service Recipient (or former Service Recipient, as applicable) may be required to withhold or account for Tax-Related Items in more than one jurisdiction.

(b)The Company shall have the authority and the right to deduct or withhold, or to require Participant to remit to the Company or the Service Recipient, an amount sufficient to satisfy all applicable Tax-Related Items with respect to any taxable event arising in connection with the RSUs. Participant hereby authorizes the Company and/or the Service Recipient, or their respective agents, at their discretion, to satisfy any applicable withholding obligations for Tax-Related Items by one or a combination of the following methods:

(i)withholding from Participant’s salary, wages, or any other amounts payable to the Participant;

(ii)withholding Shares otherwise issuable to Participant upon settlement of the RSUs and Dividend Equivalents, provided that to the extent necessary to qualify for an exemption from application of Section 16(b) of the Exchange Act, if applicable, such Share withholding procedure will be subject to the express prior approval of the Administrator;

3

(iii)instructing a broker on Participant’s behalf (pursuant to this authorization and without further consent) to sell Shares otherwise issuable to Participant upon settlement of the RSUs and Dividend Equivalents and submit the proceeds of such sale to the Company; or

(iv)any other method determined by the Company to be permitted under the Plan and in compliance with Applicable Law.

(c)The Company may withhold or account for Tax-Related Items by considering statutory withholding amounts or other applicable withholding rates, including maximum rates applicable in Participant’s jurisdiction(s). In the event of over-withholding, Participant may receive a refund of any over-withheld amount in cash and (with no entitlement to the equivalent in Shares) or if not refunded, Participant may seek a refund from the local tax authorities. In the event of under-withholding, Participant may be required to pay any additional Tax-Related Items directly to the applicable tax authority or to the Company and/or the Service Recipient. If the obligations for Tax-Related Items is satisfied by withholding Shares, for tax purposes, Participant will be deemed to have been issued the full number of Shares subject to the vested RSUs and Dividend Equivalents, notwithstanding that a number of the Shares is held back solely for the purpose of satisfying withholding obligations for Tax-Related Items.

(d)Participant agrees to pay the Company or the Service Recipient any amount of Tax-Related Items that cannot be satisfied by the means described above in Section 3.2(b). The Company shall not be obligated to deliver any Shares to Participant or Participant’s legal representative unless and until Participant or Participant’s legal representative shall have paid or otherwise satisfied in full the amount of any withholding obligation for Tax-Related Items resulting from the RSUs, the Dividend Equivalents or the Shares subject to the RSUs and the Dividend Equivalents.

ARTICLE IV.

OTHER PROVISIONS

4.1Nature of Grant. By accepting the RSUs, Participant acknowledges, understands, and agrees that:

(b)the Plan is established voluntarily by the Company, and it is wholly discretionary in nature;

(c)the grant of the RSUs is exceptional, voluntary and occasional and does not create any contractual or other right to receive future grants of restricted stock units, or benefits in lieu of restricted stock units, even if restricted stock units have been granted in the past;

(d)all decisions with respect to future RSU or other grants, if any, will be at the sole discretion of the Company;

(e)Participant is voluntarily participating in the Plan;

(f)the RSUs, the Dividend Equivalents and any Shares acquired under the Plan, and the income from and value of same, are not intended to replace any pension rights or compensation;

(g)the RSUs, the Dividend Equivalents and any Shares acquired under the Plan, and the income from and value of same, are not part of normal or expected compensation for any purposes, including but not limited to, calculating any severance, resignation, termination, redundancy, dismissal, end-of-service payments, bonuses, long-service awards, holiday pay, pension or retirement or welfare benefits or similar payments;

(h)the future value of the Shares underlying the RSUs and the Dividend Equivalents is unknown, indeterminable, and cannot be predicted with certainty;

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(i)no claim or entitlement to compensation or damages shall arise from forfeiture of the RSUs and the Dividend Equivalents resulting from Participant’s Termination of Service (for any reason whatsoever, whether or not later found to be invalid or in breach of Applicable Laws in the jurisdiction where Participant is providing service or the terms of Participant’s employment or other service agreement, if any);

(j)unless otherwise agreed with the Company, the RSUs, the Dividend Equivalents and the Shares subject to the RSUs, and the income from and value of same, are not granted as consideration for, or in connection with, the service Participant may provide as a director of a Subsidiary or affiliate;

(k)unless otherwise provided in the Plan or by the Company in its discretion, the RSUs, the Dividend Equivalents and the benefits evidenced by this Agreement do not create any entitlement to have the RSUs, the Dividend Equivalents or any such benefits transferred to, or assumed by, another company nor be exchanged, cashed out or substituted for, in connection with any corporate transaction affecting the Shares; and

(l)neither the Company, the Service Recipient nor any other Subsidiary or affiliate shall be liable for any foreign exchange rate fluctuation between Participant’s local currency and the U.S. dollar that may affect the value of the RSUs, the Dividend Equivalents or of any amounts due to Participant pursuant to the vesting of the RSUs or of the Dividend Equivalents or the subsequent sale of any Shares acquired upon settlement of the RSUs and the Dividend Equivalents.

4.2Adjustments. Participant acknowledges that the RSUs, the Shares subject to the RSUs and the Dividend Equivalents are subject to adjustment, modification and termination in certain events as provided in this Agreement and the Plan.

4.3Notices. Any notice to be given under the terms of this Agreement to the Company must be in writing and addressed to the Company in care of the Company’s General Counsel at the Company’s principal office or the General Counsel’s then-current email address or facsimile number. Any notice to be given under the terms of this Agreement to Participant must be in writing and addressed to Participant at Participant’s last known mailing address, email address or facsimile number in the Company’s personnel files. By a notice given pursuant to this Section, either party may designate a different address for notices to be given to that party. Any notice will be deemed duly given when actually received, when sent by email, when sent by certified mail (return receipt requested) and deposited with postage prepaid in a post office or branch post office regularly maintained by the United States Postal Service, or comparable non-U.S. postal service, when delivered by a nationally recognized express shipping company or upon receipt of a facsimile transmission confirmation.

4.4Titles. Titles are provided herein for convenience only and are not to serve as a basis for interpretation or construction of this Agreement.

4.5Governing Law and Venue. The Grant Notice and this Agreement will be governed by and interpreted in accordance with the laws of the State of Delaware, disregarding any state's choice-of-law principles requiring the application of a jurisdiction's laws other than the State of Delaware. For purposes of any action, lawsuit or other proceeding brought to enforce this Agreement, relating to it, or arising from it, the parties hereby submit to and consent to the sole and exclusive jurisdiction of the state and federal courts in Wake County, North Carolina, and no other courts, where this grant is made and/or to be performed.

4.6Conformity to Securities Laws. Participant acknowledges that the Plan, the Grant Notice and this Agreement are intended to conform to the extent necessary with all Applicable Laws and, to the extent Applicable Laws permit, will be deemed amended as necessary to conform to Applicable Laws.

4.7Successors and Assigns. The Company may assign any of its rights under this Agreement to single or multiple assignees, and this Agreement will inure to the benefit of the successors and assigns of the Company. Subject to the restrictions on transfer set forth in this Agreement or the Plan, this Agreement will be binding upon and inure to the benefit of the heirs, legatees, legal representatives, successors and assigns of the parties hereto.

5

4.8Limitations Applicable to Section 16 Persons. Notwithstanding any other provision of the Plan or this Agreement, if Participant is subject to Section 16 of the Exchange Act, the Plan, the Grant Notice, this Agreement, the RSUs and the Dividend Equivalents will be subject to any additional limitations set forth in any applicable exemptive rule under Section 16 of the Exchange Act (including any amendment to Rule 16b-3) that are requirements for the application of such exemptive rule. To the extent Applicable Laws permit, this Agreement will be deemed amended as necessary to conform to such applicable exemptive rule.

4.9Entire Agreement. The Plan, the Grant Notice and this Agreement (including any exhibit hereto) constitute the entire agreement of the parties and supersede in their entirety all prior undertakings and agreements of the Company and Participant with respect to the subject matter hereof.

4.10Agreement Severable. In the event that any provision of the Grant Notice or this Agreement is held illegal or invalid, the provision will be severable from, and the illegality or invalidity of the provision will not be construed to have any effect on, the remaining provisions of the Grant Notice or this Agreement.

4.11Limitation on Participant’s Rights. Participation in the Plan confers no rights or interests other than as herein provided. This Agreement creates only a contractual obligation on the part of the Company as to amounts payable and may not be construed as creating a trust. Neither the Plan nor any underlying program, in and of itself, has any assets. Participant will have only the rights of a general unsecured creditor of the Company with respect to amounts credited and benefits payable, if any, with respect to the RSUs and Dividend Equivalents, and rights no greater than the right to receive cash or the Shares as a general unsecured creditor with respect to the RSUs and Dividend Equivalents, as and when settled pursuant to the terms of this Agreement.

4.12Not a Contract of Employment. Nothing in the Plan, the Grant Notice or this Agreement confers upon Participant any right to continue in the employ or other service of the Company, the Service Recipient or any other Subsidiary or affiliate or interferes with or restricts in any way the rights of the Company, the Service Recipient and any other Subsidiary or affiliate, which rights are hereby expressly reserved, to discharge or terminate the services of Participant at any time for any reason whatsoever, with or without cause, except to the extent expressly provided otherwise in a written agreement between the Company, the Service Recipient or another Subsidiary or affiliate and Participant.

4.13Electronic Delivery and Participation. The Company may, in its sole discretion, decide to deliver any documents related to current or future participation in the Plan by electronic means. Participant hereby consents to receive such documents by electronic delivery and agrees to participate in the Plan through an on-line or electronic system established and maintained by the company or a third party designated by the Company.

4.14Language. Participant acknowledges that Participant is sufficiently proficient in English, or has consulted with an advisor who is sufficiently proficient in English, so as to allow Participant to understand the terms and conditions of this Agreement. If Participant received this Agreement, or any other document related to the RSUs and/or the Plan translated into a language other than English and if the meaning of the translated version is different than the English version, the English version will control.

4.15Appendix. Notwithstanding any provisions in this Global Restricted Stock Unit Award Agreement, the RSUs shall be subject to any additional terms and conditions set forth in the Appendix to this Global Restricted Stock Unit Agreement for Participant’s country. Moreover, if Participant relocates to one of the countries included in the Appendix, the additional terms and conditions for such country will apply to Participant, to the extent the Company determines that the application of such terms and conditions is necessary or advisable for legal or administrative reasons. The Appendix constitutes part of this Agreement.

4.16Insider Trading/Market Abuse Laws. Participant acknowledges that, depending on Participant’s country or broker’s country, or the country in which the Shares are listed, Participant may be subject to insider trading restrictions and/or market abuse laws in applicable jurisdictions, which may affect his or her ability to accept, acquire, sell or attempt to sell, or otherwise dispose of the Shares, rights to Shares (e.g., the

6

RSUs) or rights linked to the value of Shares, during such times as Participant is considered to have “inside information” regarding the Company (as defined by the laws or regulations in applicable jurisdictions). Local insider trading laws and regulations may prohibit the cancellation or amendment of orders Participant placed before possessing inside information. Furthermore, Participant may be prohibited from (i) disclosing insider information to any third party, including fellow employees (other than on a “need to know” basis) and (ii) “tipping” third parties or causing them to otherwise buy or sell securities. Any restrictions under these laws or regulations are separate from and in addition to any restrictions that may be imposed under any applicable Company insider trading policy. Participant acknowledges that it is his or her responsibility to comply with any applicable restrictions, and Participant should speak to his or her personal advisor on this matter.

4.17Foreign Asset/Account, Exchange Control and Tax Reporting. Participant acknowledges that Participant may be subject to foreign asset/account, exchange control and/or tax reporting requirements as a result of the acquisition, holding and/or transfer of Shares or cash (including dividends and the proceeds arising from the sale of Shares) derived from his or her participation in the Plan in, to and/or from a brokerage/bank account or legal entity located outside Participant’s country. Applicable Laws may require that Participant report such accounts, assets, the balances therein, the value thereof and/or the transactions related thereto to the applicable authorities in such country. Participant also may be required to repatriate sale proceeds or other funds received as a result of Participant’s participation in the Plan to his or her country through a designated bank or broker within a certain time after receipt. Participant acknowledges that he or she is responsible for ensuring compliance with any applicable foreign asset/account, exchange control and tax reporting requirements and should consult his or her personal legal advisor on this matter.

4.18Counterparts. The Grant Notice may be executed in one or more counterparts, including by way of any electronic signature, subject to Applicable Law, each of which will be deemed an original and all of which together will constitute one instrument.

7

APPENDIX

TO

GLOBAL RESTRICTED STOCK UNIT AGREEMENT

BANDWIDTH INC.

2017 INCENTIVE AWARD PLAN

Capitalized terms used but not defined herein shall have the meanings ascribed to them in the Grant Notice, the Global Restricted Stock Unit Agreement (the "RSU Agreement") and the Plan.

Terms and Conditions

This Appendix includes additional terms and conditions that govern the RSUs if Participant resides and/or works in one of the countries listed below.

If Participant is a citizen or resident (or is considered as such for local law purposes) of a country other than the country in which Participant is currently residing and/or working, or if Participant transfers to another country after the Grant Date, the Administrator shall, in its discretion, determine to what extent the terms and conditions contained herein shall be applicable to Participant.

Notifications

This Appendix also includes information regarding securities, exchange controls, tax and certain other issues of which Participant should be aware with respect to his or her participation in the Plan. The information is based on the securities, exchange control, tax and other laws in effect in the respective countries as of July 2021. Such laws are often complex and change frequently. As a result, the Company strongly recommends that Participant not rely on the information noted herein as the only source of information relating to the consequences of his or her participation in the Plan because the information may be out of date at the time the RSUs vest or Participant sells Shares acquired under the Plan.

In addition, the information contained herein is general in nature and may not apply to Participant’s particular situation, and the Company is not in a position to assure Participant of any particular result. Accordingly, Participant should seek appropriate professional advice as to how the relevant laws in his or her country may apply to Participant’s situation.

If Participant is a citizen or resident (or is considered as such for local law purposes) of a country other than the one in which he or she is currently residing and/or working, or if Participant transfers to another country after the Grant Date, the information contained herein may not be applicable to Participant in the same manner.

8

Data Privacy Provisions Applicable to all Non-U.S. Participants

The Company and the Service Recipient collect, process, and use certain personal data about Participant, including, but not limited to, Participant’s name, home address, telephone number, email address, date of birth, social insurance number, passport or other identification number, salary, nationality, job title, any Shares or directorships held in the Company, details of all RSUs granted under the Plan or any other entitlement to Shares awarded, canceled, exercised, vested, unvested or outstanding in Participant’s favor (“Data”), for the legitimate purpose of implementing, administering and managing the Plan and to fulfill the RSU Agreement and the Plan as a benefit to the Participant, in accordance with and subject to the Company’s Employee Global Privacy Notice. For clarity, the Company may transfer Data to stock plan administration service providers or other third-party service providers located in the United States to assist the Company with the implementation, administration, and management of the Plan and performance of the RSU Agreement, as provided in the Company’s Employee Global Privacy Notice.

BELGIUM

Notifications

Foreign Asset / Account Tax Reporting Information. Belgian residents are required to report any security or bank accounts (including brokerage accounts) opened and maintained outside Belgium on their annual tax return. In a separate report, they must provide the National Bank of Belgium with certain details regarding such foreign accounts (including the account number, bank name and country in which such account was opened). The forms to complete this report are available on the website of the National Bank of Belgium.

Stock Exchange Tax Information. A stock exchange tax applies to transactions executed by a Belgian resident through a non-Belgian financial intermediary, such as a U.S. broker. The stock exchange tax likely will not apply when the RSUs vest, but likely will apply when the Shares are sold. Participant should consult with a personal tax or financial advisor for additional details on Participant’s obligations with respect to the stock exchange tax.

Annual Securities Account Tax Information. A new “annual securities accounts tax” has been implemented, which imposes a 0.15% annual tax on the value of qualifying securities held in a Belgian or foreign securities account. The tax will not apply unless the total value of securities held in such an account exceeds an average of €1 million on four reference dates within the relevant reporting period (i.e., December 31, March 31, June 30 and September 30). Different payment obligations may apply, depending on whether the securities account is held with a Belgian or foreign financial institution. Participant should consult their personal tax advisor for more information regarding Participant’s annual securities accounts tax payment obligations.

IRELAND

There are no country-specific provisions.

ROMANIA

Terms and Conditions

Language Consent. By accepting the grant of RSUs, Participant acknowledges that Participant is proficient in reading and understanding English and fully understands the terms of the documents related to the grant (the Grant Notice, the Agreement and the Plan), which were provided in the English language. Participant accepts the terms of those documents accordingly.

9

Consimtamant cu privire la limba. Prin acceptarea acordarii de RSU-uri, Participantul confirma ca acesta sau aceasta are un nivel adecvat de cunoastere in ce priveste cititirea si intelegerea limbii engleze, a citit si confirma ca a inteles pe deplin termenii documentelor referitoare la acordare (Anuntul, Acordul si Planul), care au fost furnizate in limba engleza. Participantul accepta termenii acestor documente in consecinta.

Notifications

Exchange Control Information. If Participant deposits the proceeds from the sale of Shares acquired under the Plan into a bank account in Romania, Participant may be required to provide the Romanian bank with appropriate documentation explaining the source of the funds. Participant understands that Participant should consult with Participant’s personal legal advisor to determine whether Participant will be required to submit such documentation to the Romanian bank.

SPAIN

Terms and Conditions

Nature of Grant. The following provision supplements Section 4.1 of the RSU Agreement:

By accepting this grant of RSUs, Participant consents to participation in the Plan and acknowledges that Participant has received a copy of the Plan.

Participant understands that the Company has unilaterally, gratuitously, and in its sole discretion decided to grant RSUs and Dividend Equivalents under the Plan to Service Providers throughout the world. The decision is a limited decision that is entered into upon the express assumption and condition that any grant will not bind the Company or any Subsidiary or affiliate, other than to the extent set forth in this Agreement. Consequently, Participant understands that the RSUs and Dividend Equivalents are granted on the assumption and condition that the RSUs, the Dividend Equivalents and any Shares acquired at settlement of the RSUs and Dividend Equivalants are not part of any employment or other service agreement (either with the Company or any Subsidiary or affiliate, including the Service Recipient), and shall not be considered a mandatory benefit, salary for any purposes (including severance compensation), or any other right whatsoever. In addition, Participant understands that this grant of RSUs would not be made but for the assumptions and conditions referred to above; thus, Participant acknowledges and freely accepts that, should any or all of the assumptions be mistaken or should any of the conditions not be met for any reason, then any award of or right to the RSUs shall be null and void.

Further, the Participant understands that Participant will not be entitled to continue vesting in any RSUs or Dividend Equivalents once Participant experiences a Termination of Service. This will be the case, for example, even in the event of a termination of Participant by reason of, but not limited to, resignation, retirement, disciplinary dismissal adjudged to be with cause, disciplinary dismissal adjusted or recognized to be without cause, individual or collective dismissal or objective grounds, whether adjudged or recognized to be without cause, material modification of the terms of employment or service under Article 41 of the Workers’ Statute, relocation under Article 40 of the Workers’ Statute, Article 50 of the Workers’ Statute, unilateral withdrawal by the Service Recipient and under Article 10.3 of the Royal Decree 1382/1985. Participant acknowledges that Participant has read and specifically accepts the conditions referred to in Section 4.1 of the RSU Agreement.

Notifications

Securities Law Information. No “offer to the public,” as defined under Spanish law, has taken place or will take place in the Spanish territory in connection with the RSUs and Dividend Equivalents. The Plan, this Agreement, and any other documents evidencing this grant of RSUs have not been, nor will they be, registered with the

10

Comisión Nacional del Mercado de Valores (the Spanish securities regulator), and none of those documents constitutes a public offering prospectus.

Exchange Control Information. Participant must declare the acquisition of Shares to the Spanish Dirección General de Comercio e Inversiones (the “DGCI”), the Bureau for Commerce and Investments, which is a department of the Ministry of Economics and Competitiveness. Participant must also declare ownership of any Shares by filing a Form D-6 with the Directorate of Foreign Transactions each January while the Shares are owned. In addition, the sale of Shares must also be declared on Form D-6 filed with the DGCI in January, unless the sale proceeds exceed the applicable threshold (currently €1,502,530), in which case, the filing is due within one month after the sale.

In addition, Participant is required to declare electronically to the Bank of Spain any securities accounts (including brokerage accounts held abroad), any foreign instruments (e.g., Shares) and any transactions with non-Spanish residents (including any payments of cash or Shares made to Participant by the Company or any U.S. brokerage account) if the balances in such accounts together with the value of such instruments as of December 31, or the volume of transactions with non-Spanish residents during the prior or current year, exceed €1 million.

UNITED KINGDOM

Terms and Conditions

Responsibility for Taxes.The following provision supplements Section 3.2 of the RSU Agreement:

Without limitation to Section 3.2 of the RSU Agreement, Participant agrees that Participant is liable for all Tax-Related Items and hereby covenants to pay all such Tax-Related Items as and when requested by the Company or the Service Recipient or by Her Majesty’s Revenue and Customs (“HMRC”) (or any other tax authority or any other relevant authority). Participant also agrees to indemnify and keep indemnified the Company and the Service Recipient against any Tax-Related Items that they are required to pay or withhold or have paid or will pay to HMRC (or any other tax authority or any other relevant authority) on Participant’s behalf.

Notwithstanding the foregoing, if Participant is a director or executive officer (within the meaning of Section 13(k) of the Exchange Act), the terms of the immediately foregoing provision will not apply in case the indemnification is viewed as a loan. In this case, any income tax not collected within ninety (90) days of the end of the U.K. tax year in which an event giving rise to the Tax-Related Items occurs may constitute a benefit to Participant on which additional income tax and employee National Insurance contributions (“NICs”) may be payable. Participant understands that he or she will be responsible for reporting and paying any income tax due on this additional benefit directly to HMRC under the self-assessment regime and for paying the Company and/or the Service Recipient (as appropriate) for the value of employee NICs due on this additional benefit, which the Company and/or the Service Recipient may collect by any of the means referred to in Section 3.2(b) of the RSU Agreement.

11

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF

THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, David A. Morken, certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Bandwidth Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a—15(e) and 15d—15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 9, 2021

/s/ David A. Morken

David A. Morken

Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO RULE 13a-14(a) OR 15d-14(a) OF

THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF

THE SARBANES-OXLEY ACT OF 2002

I, Daryl E. Raiford certify that:

1.I have reviewed this Quarterly Report on Form 10-Q of Bandwidth Inc.;

2.Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3.Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4.The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a—15(e) and 15d—15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a.Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b.Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c.Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d.Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5.The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a.All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b.Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: November 9, 2021

/s/ Daryl E. Raiford

Daryl E. Raiford

Chief Financial Officer

(Principal Accounting and Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION OF CHIEF EXECUTIVE OFFICER AND CHIEF FINANCIAL OFFICER

PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), David A. Morken, Chief Executive Officer of Bandwidth Inc. (the “Company”), and Daryl E. Raiford, Chief Financial Officer of the Company, each hereby certifies that, to the best of his knowledge: 

1.The Company’s Quarterly Report on Form 10-Q for the quarterly period ended September 30, 2021, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

2.The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 9, 2021

/s/ David A. Morken

David A. Morken

Chief Executive Officer

(Principal Executive Officer)

/s/ Daryl E. Raiford

Daryl E. Raiford

Chief Financial Officer

(Principal Accounting and Financial Officer)

XML

Cover - shares	9 Months Ended
	Sep. 30, 2021	Oct. 29, 2021
Entity Information [Line Items]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2021
Document Transition Report	false
Entity File Number	001-38285
Entity Registrant Name	BANDWIDTH INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	56-2242657
Entity Address, Address Line One	900 Main Campus Drive
Entity Address, City or Town	Raleigh
Entity Address, State or Province	NC
Entity Address, Postal Zip Code	27606
City Area Code	(800)
Local Phone Number	808-5150
Title of 12(b) Security	Class A Common Stock, par value $0.001 per share
Trading Symbol	BAND
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0001514416
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Amendment Flag	false
Class A voting common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		23,168,711
Class B voting common stock
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding		1,965,170

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 321,819	$ 72,163
Restricted cash	9,239	9,274
Other investments	0	40,000
Accounts receivable, net of allowance for doubtful accounts	75,161	55,243
Deferred costs	2,951	2,411
Prepaid expenses and other current assets	22,355	14,508
Total current assets	431,525	193,599
Property, plant and equipment, net	68,267	51,645
Operating right-of-use asset, net	15,612	19,491
Intangible assets, net	220,566	248,055
Deferred costs, non-current	4,262	3,604
Other long-term assets	7,543	1,975
Goodwill	353,151	372,239
Total assets	1,100,926	890,608
Current liabilities:
Accounts payable	15,688	11,665
Accrued expenses and other current liabilities	76,259	63,065
Current portion of deferred revenue	6,362	6,515
Advanced billings	4,797	5,429
Operating lease liability, current	6,015	5,515
Total current liabilities	109,121	92,189
Other liabilities	5,416	1,707
Operating lease liability, net of current portion	12,525	17,202
Deferred revenue, net of current portion	7,383	6,386
Deferred tax liability	57,997	61,005
Convertible senior notes	479,155	282,196
Total liabilities	671,597	460,685
Stockholders’ equity:
Class A and Class B common stock	25	24
Additional paid-in capital	499,738	451,463
Accumulated deficit	(68,693)	(49,505)
Accumulated other comprehensive income (loss)	(1,741)	27,941
Total stockholders’ equity	429,329	429,923
Total liabilities and stockholders’ equity	$ 1,100,926	$ 890,608

XML

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 130,638	$ 84,758	$ 364,775	$ 230,066
Cost of revenue	72,395	45,527	199,782	123,895
Gross profit	58,243	39,231	164,993	106,171
Operating expenses:
Research and development	13,359	10,232	39,509	29,316
Sales and marketing	13,592	9,001	38,168	27,073
General and administrative	30,354	18,134	85,481	51,070
Total operating expenses	57,305	37,367	163,158	107,459
Operating income (loss)	938	1,864	1,835	(1,288)
Other expense, net	(7,567)	(4,206)	(20,768)	(8,980)
Loss before income taxes	(6,629)	(2,342)	(18,933)	(10,268)
Income tax provision	(315)	(10)	(255)	(13,783)
Net loss	$ (6,944)	$ (2,352)	$ (19,188)	$ (24,051)
Net loss per share, basic (in usd per share)	$ (0.28)	$ (0.10)	$ (0.77)	$ (1.01)
Net loss per share, diluted (in usd per share)	$ (0.28)	$ (0.10)	$ (0.77)	$ (1.01)
Weighted average number of common shares outstanding, basic (in shares)	25,114,762	24,175,762	25,075,941	23,905,322
Weighted average number of common shares outstanding, diluted (in shares)	25,114,762	24,175,762	25,075,941	23,905,322

XML

Condensed Consolidated Statements of Comprehensive Loss - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (6,944)	$ (2,352)	$ (19,188)	$ (24,051)
Other comprehensive income (loss)
Foreign currency translation, net of income taxes	(12,512)	139	(29,682)	20
Other comprehensive income (loss)	(12,512)	139	(29,682)	20
Total comprehensive loss	$ (19,456)	$ (2,213)	$ (48,870)	$ (24,031)

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Condensed Consolidated Statements of Changes in Stockholders’ Equity - USD ($) $ in Thousands	Total	Conversion of Class B voting common stock to Class A voting common stock	Class A voting common stock	Class B voting common stock	Common stock Class A voting common stock	Common stock Class A voting common stock Conversion of Class B voting common stock to Class A voting common stock	Common stock Class B voting common stock	Common stock Class B voting common stock Conversion of Class B voting common stock to Class A voting common stock	Additional paid-in capital	Accumulated other comprehensive (loss) income	Accumulated deficit
Beginning balance (in shares) at Dec. 31, 2019					18,584,478		4,927,401
Beginning balance at Dec. 31, 2019	$ 270,090				$ 19		$ 5		$ 275,553	$ 41	$ (5,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of debt conversion option	104,553								104,553
Debt conversion option issuance costs, net of tax	(3,731)								(3,731)
Capped call option purchase price	(43,320)								(43,320)
Exercises of vested stock options (in shares)					32,059
Exercises of vested stock options	244								244
Vesting of restricted stock units (in shares)					103,824
Equity awards withheld for tax liability (in shares)					(14,411)
Equity awards withheld for tax liability	(1,021)								(1,021)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						500,250		(500,250)
Conversion of Class B voting common stock to Class A voting common stock		$ (1)						$ (1)
Foreign currency translation	(96)									(96)
Stock based compensation	2,499								2,499
Net loss	(1,058)										(1,058)
Ending balance (in shares) at Mar. 31, 2020					19,206,200		4,427,151
Ending balance at Mar. 31, 2020	328,159				$ 19		$ 4		334,777	(55)	(6,586)
Beginning balance (in shares) at Dec. 31, 2019					18,584,478		4,927,401
Beginning balance at Dec. 31, 2019	270,090				$ 19		$ 5		275,553	41	(5,528)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(24,051)
Ending balance (in shares) at Sep. 30, 2020					21,222,929		2,993,136
Ending balance at Sep. 30, 2020	313,139				$ 21		$ 3		342,633	61	(29,579)
Beginning balance (in shares) at Mar. 31, 2020					19,206,200		4,427,151
Beginning balance at Mar. 31, 2020	328,159				$ 19		$ 4		334,777	(55)	(6,586)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Debt conversion option issuance costs, net of tax	(11)								(11)
Exercises of vested stock options (in shares)					502,182
Exercises of vested stock options	3,297				$ 1				3,296
Vesting of restricted stock units (in shares)					21,871
Equity awards withheld for tax liability (in shares)					(2,133)
Equity awards withheld for tax liability	(272)								(272)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						827,597		(827,597)
Foreign currency translation	(23)									(23)
Stock based compensation	2,425								2,425
Net loss	(20,641)										(20,641)
Ending balance (in shares) at Jun. 30, 2020					20,555,717		3,599,554
Ending balance at Jun. 30, 2020	312,934				$ 20		$ 4		340,215	(78)	(27,227)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises of vested stock options (in shares)					44,848
Exercises of vested stock options	386								386
Vesting of restricted stock units (in shares)					17,948
Equity awards withheld for tax liability (in shares)					(2,002)
Equity awards withheld for tax liability	(350)								(350)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						606,418		(606,418)
Conversion of Class B voting common stock to Class A voting common stock		0				$ 1		$ (1)
Foreign currency translation	139									139
Stock based compensation	2,382								2,382
Net loss	(2,352)										(2,352)
Ending balance (in shares) at Sep. 30, 2020					21,222,929		2,993,136
Ending balance at Sep. 30, 2020	313,139				$ 21		$ 3		342,633	61	(29,579)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises of vested stock options (in shares)					13,995
Exercises of vested stock options	149								149
Vesting of restricted stock units (in shares)					17,424
Equity awards withheld for tax liability (in shares)					(1,749)
Equity awards withheld for tax liability	(273)								(273)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						497,011		(497,011)
Conversion of Class B voting common stock to Class A voting common stock		(1)						$ (1)
Equity consideration for Voxbone acquisition (in shares)					663,394
Equity consideration for Voxbone acquisition	106,380				$ 1				106,379
Foreign currency translation	27,880									27,880
Stock based compensation	2,575								2,575
Net loss	(19,926)										(19,926)
Ending balance (in shares) at Dec. 31, 2020			22,413,004	2,496,125	22,413,004		2,496,125
Ending balance at Dec. 31, 2020	429,923				$ 22		$ 2		451,463	27,941	(49,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of debt conversion option	66,908								66,908
Debt conversion option issuance costs, net of tax	(2,049)								(2,049)
Capped call option purchase price	(25,500)								(25,500)
Exercises of vested stock options (in shares)					57,817
Exercises of vested stock options	753								753
Vesting of restricted stock units (in shares)					141,707
Equity awards withheld for tax liability (in shares)					(19,879)
Equity awards withheld for tax liability	(3,187)								(3,187)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						280,955		(280,955)
Conversion of Class B voting common stock to Class A voting common stock		$ 1				$ 1
Foreign currency translation	(23,185)									(23,185)
Stock based compensation	4,390								4,390
Net loss	(5,316)										(5,316)
Ending balance (in shares) at Mar. 31, 2021					22,873,604		2,215,170
Ending balance at Mar. 31, 2021	442,738				$ 23		$ 2		492,778	4,756	(54,821)
Beginning balance (in shares) at Dec. 31, 2020			22,413,004	2,496,125	22,413,004		2,496,125
Beginning balance at Dec. 31, 2020	429,923				$ 22		$ 2		451,463	27,941	(49,505)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net loss	(19,188)
Ending balance (in shares) at Sep. 30, 2021			23,165,119	1,965,170	23,165,119		1,965,170
Ending balance at Sep. 30, 2021	429,329				$ 23		$ 2		499,738	(1,741)	(68,693)
Beginning balance (in shares) at Mar. 31, 2021					22,873,604		2,215,170
Beginning balance at Mar. 31, 2021	442,738				$ 23		$ 2		492,778	4,756	(54,821)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Debt conversion option issuance costs, net of tax	30								30
Exercises of vested stock options (in shares)					4,406
Exercises of vested stock options	46								46
Vesting of restricted stock units (in shares)					15,605
Equity awards withheld for tax liability (in shares)					(1,948)
Equity awards withheld for tax liability	(265)								(265)
Foreign currency translation	6,015									6,015
Stock based compensation	3,377								3,377
Net loss	(6,928)										(6,928)
Ending balance (in shares) at Jun. 30, 2021					22,891,667		2,215,170
Ending balance at Jun. 30, 2021	445,013				$ 23		$ 2		495,966	10,771	(61,749)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercises of vested stock options (in shares)					8,700
Exercises of vested stock options	101								101
Vesting of restricted stock units (in shares)					16,383
Equity awards withheld for tax liability (in shares)					(1,631)
Equity awards withheld for tax liability	(154)								(154)
Conversion of Class B voting common stock to Class A voting common stock (in shares)						250,000		(250,000)
Foreign currency translation	(12,512)									(12,512)
Stock based compensation	3,825								3,825
Net loss	(6,944)										(6,944)
Ending balance (in shares) at Sep. 30, 2021			23,165,119	1,965,170	23,165,119		1,965,170
Ending balance at Sep. 30, 2021	$ 429,329				$ 23		$ 2		$ 499,738	$ (1,741)	$ (68,693)

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Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities
Net loss	$ (19,188)	$ (24,051)
Adjustments to reconcile net loss to net cash provided by operating activities
Depreciation and amortization	27,478	9,927
Right-of-use asset amortization	4,251	3,522
Amortization of debt discount and issuance costs	19,475	10,916
Stock-based compensation	11,592	7,306
Deferred taxes	329	14,254
Loss on disposal of property and equipment	357	263
Changes in operating assets and liabilities:
Accounts receivable, net of allowances	(20,610)	(16,218)
Prepaid expenses and other assets	(4,173)	(2,224)
Accounts payable	7,122	2,905
Accrued expenses and other liabilities	1,590	8,675
Operating right-of-use liability	(4,535)	(3,944)
Net cash (used in) provided by operating activities	23,688	11,331
Cash flows from investing activities
Purchase of property and equipment	(12,552)	(9,536)
Capitalized software development costs	(3,212)	(1,846)
Purchase of land	(30,017)	0
Proceeds from sale of land	17,462	0
Purchase of other investments	0	(230,780)
Proceeds from sales and maturities of other investments	40,000	0
Net cash (used in) provided by investing activities	11,681	(242,162)
Cash flows from financing activities
Payments on finance leases	(161)	0
Proceeds from issuance of convertible senior notes	250,000	400,000
Purchase of capped call	(25,500)	(43,320)
Payment of debt issuance costs	(7,544)	(11,965)
Proceeds from exercises of stock options	886	3,859
Value of equity awards withheld for tax liabilities	(3,720)	(1,472)
Net cash provided by financing activities	213,961	347,102
Effect of exchange rate changes on cash, cash equivalents and restricted cash	291	48
Net increase in cash, cash equivalents, and restricted cash	249,621	116,319
Cash, cash equivalents, and restricted cash, beginning of period	81,437	185,004
Cash, cash equivalents, and restricted cash, end of period	331,058	301,323
Supplemental disclosure of cash flow information
Cash paid for interest	674	556
Cash (refunded) paid for taxes, net	961	(152)
Supplemental disclosure of noncash investing and financing activities
Purchase of property and equipment, accrued but not paid	7,611	2,073
Obligation included in basis of acquired land	7,752	0
Lease incentive	3,193	0
Obligation included in basis of land acquired by the Developer	4,512	0
Equity awards withheld for tax liabilities, accrued but not paid	$ 132	$ 348

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Organization and Description of Business

9 Months Ended

Sep. 30, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Organization and Description of Business

1. Organization and Description of Business

Bandwidth Inc. (together with its subsidiaries, “Bandwidth” or the “Company”) was founded in July 2000 and incorporated in Delaware on March 29, 2001. The Company’s headquarters are located in Raleigh, North Carolina. The Company is an international cloud-based, software-powered communications platform-as-a-service (“CPaaS”) provider that enables enterprises to create, scale and operate voice or messaging communications services across any mobile application or connected device.

The Company has two operating and reportable segments, CPaaS and Other. CPaaS revenue is derived from usage and monthly services fees charged for usage of Voice, Messaging, 911 and Phone Numbers solutions through the Company’s proprietary CPaaS software application programming interfaces. Other revenue consists of fees charged for services provided such as: SIP trunking, data resale, and a hosted Voice-over Internet Protocol (“VoIP”). The Other segment also includes revenue from traffic generated by other carriers, SMS registration fees and other miscellaneous product lines.

On November 2, 2020, the Company acquired all of the A Ordinary Shares, B Ordinary Shares and C Ordinary Shares of Voice Topco Limited (“Voice Topco”) through a Share Purchase Agreement (the “Share Purchase Agreement” and such purchase, the “Share Purchase”). Voice Topco directly or indirectly held all of the issued and outstanding shares of Voxbone S.A., which (with its subsidiaries) was the operating subsidiary of Voice Topco (“Voxbone”). The transaction was valued at €446 million. As consideration for the Share Purchase, the Company (i) paid the selling stockholders approximately $400 million (or approximately €338 million based on prevailing exchange rates at the close of business on October 9, 2020) at the Closing and (ii) issued to the selling stockholders at the Closing shares of the Company’s Class A common stock, with an aggregate value of approximately €108 million (or approximately $128 million based on prevailing exchange rates at the close of business on October 9, 2020).

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Summary of Significant Accounting Policies

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 1, 2021.

The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by GAAP on an annual reporting basis.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2021 or any future period.

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Bandwidth Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and judgments that affect the amounts reported in these financial statements and accompanying notes. These estimates in the condensed consolidated financial statements include, but are not limited to, allowance for doubtful accounts, reserve for expected credit losses, reserve for sales credits, recoverability of long lived and intangible assets, fair value of acquired intangible assets and goodwill, discount rates used in the valuation of right-of-use assets and lease liabilities, the fair value of the liability and equity components of the Company’s Convertible Notes (as defined herein), estimated period of benefit, valuation allowances on deferred tax assets, certain accrued expenses and contingencies, economic and demographic actuarial assumptions related to pension and other postretirement benefit costs and liabilities, estimated cash flows on asset retirement obligation. Although the Company believes that the estimates it uses are reasonable, due to the inherent uncertainty involved in making these estimates, actual results reported in future periods could differ from those estimates.

Cash and Cash Equivalents

The Company classifies all highly liquid investments with original stated maturities of three months or less from the date of purchase as cash equivalents. All highly liquid investments with original stated maturities of greater than three months from the date of purchase are classified as current marketable securities, with the exception of time deposits with maturities greater than ninety days which are classified as other investments. Cash deposits are primarily in financial institutions in the United States. However, cash for monthly operating costs of international operations are deposited in banks outside the United States. The Company has a policy of making investments only with commercial institutions that have at least an investment grade credit rating. The Company utilizes money market funds as an investment option and only invests in AAA rated funds.

Restricted Cash

Restricted cash consists primarily of the holdback amount and its accrued interest remaining to be paid to the selling stockholders of Voxbone, employee withholding tax liability and employee benefits contributions not yet remitted. The Company has classified this asset as a short-term asset in order to match the expected period of restriction.

Accounts Receivable and Current Expected Credit Losses

Accounts receivable are stated at realizable value, net of allowances, which includes an allowance for doubtful accounts and a reserve for expected credit losses. The allowance for doubtful accounts is based on management’s assessment of the collectability of its customer accounts. The Company regularly reviews the composition of the accounts receivable aging, historical bad debts, changes in payment patterns, customer creditworthiness, current economic trends, and reasonable and supportable forecasts about the future. Relevant risk characteristics include customer size and historical loss patterns. Management has evaluated the expected credit losses related to trade accounts receivable and determined that allowances of approximately $1,203 and $1,467 for uncollectible accounts and customer balances that are disputed were required as of December 31, 2020 and September 30, 2021, respectively. Refer to Note 5, “Financial Statement Components” to these condensed consolidated financial statements, for a rollforward of the components of the allowances as of December 31, 2020 and September 30, 2021.

The Company includes unbilled receivables in its accounts receivable balance. Generally, these receivables represent earned revenue from services provided to customers, which will be billed in the next billing cycle. All

amounts are considered collectible and billable. As of December 31, 2020 and September 30, 2021, unbilled receivables were $27,692 and $32,665, respectively.

Concentration of Credit Risk

Financial instruments that are exposed to concentration of credit risk consist primarily of cash and cash equivalents, other investments and trade accounts receivable. Cash deposits may be in excess of insured limits. The Company believes that the financial institutions that hold its cash deposits are financially sound and, accordingly, minimal credit risk exists with respect to these balances.

With regard to customers, credit evaluation and account monitoring procedures are used to minimize the risk of loss. The Company believes that no additional credit risk beyond amounts provided for by the allowance for doubtful accounts are inherent in accounts receivable. As of December 31, 2020, one individual customer represented approximately 11% of the Company’s accounts receivable, net of allowance for doubtful accounts. As of September 30, 2021, one individual customer represented approximately 12% of the Company’s accounts receivable, net of allowance for doubtful accounts.

For the three and nine months ended September 30, 2020 and 2021, no individual customer represented more than 10% of the Company’s revenue.

Debt Issuance Costs

The Company incurs debt issuance costs associated with obtaining and entering into credit agreements, including the issuances of convertible notes. These costs customarily include non-refundable structuring fees, commitment fees, up-front fees and syndication expenses. The Company has a policy of deferring and amortizing these costs based on the effective interest method over the term of the credit agreements.

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The Company adopted this standard on January 1, 2021 on a prospective basis, which did not have a material impact on the Company’s financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt —Modifications and Extinguishments (Subtopic 470-50), Compensation--Stock Compensation (Topic 718), and Derivatives and Hedging--Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to provide clarity surrounding the treatment for a modification or an exchange of a freestanding equity-classified written call option. The amendments also provide guidance for the recognition and measurement of earnings-per-share (“EPS”) for certain modifications or exchanges of freestanding equity-classified written call options for entities that present EPS. The amendments do not affect a holder’s accounting for freestanding call options. ASU 2021-04 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company did not and does not expect to have any modification or exchanges of freestanding written call options classified in equity during the reporting period and therefore does not expect adoption will have a material impact on its financial statements.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to address issues identified as a result of the complexity associated with applying GAAP for certain financial instruments with characteristics of liabilities and equity. For convertible instruments, ASU 2020-06 reduces the number of accounting models for convertible debt instruments and convertible preferred stock, and enhances information transparency by making targeted improvements to the disclosures for convertible instruments and EPS guidance on the basis of feedback from financial statement users. ASU 2020-06 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The Company will adopt the new guidance on January 1, 2022 using the modified retrospective approach resulting in adjustments in accumulated deficit and paid in capital. The Company will also record an increase in the convertible notes balance as a result of the reversal of the separation of the convertible debt between debt and equity. The adoption of this standard will decrease the amount of non-cash interest expense to be recognized in future periods as a result of eliminating the discount associated with the equity component. The number of diluted shares will increase as a result of transitioning from the treasury stock method to the as-if converted method for the calculation. The Company is currently quantifying the effect of adopting this new accounting guidance on its financial statements and earnings per share calculations.

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Business Combination

9 Months Ended

Sep. 30, 2021

Business Combination and Asset Acquisition [Abstract]

Business Combination

3. Business Combination

During the three months ended September 30, 2021, the Company made measurement period adjustments to reflect facts and circumstances in existence as of October 31, 2020, the effective date of the Share Purchase (the “Effective Date”). The adjustments primarily related to certain state and local tax liabilities that were not reasonably estimable at the Effective Date and consisted of a $1,609 increase to goodwill and $1,609 increase to accrued expenses and other current liabilities.

The preliminary fair values of net assets acquired are substantially complete with the exception of certain working capital adjustments and goodwill. As the Company finalizes the fair value of assets acquired and liabilities assumed, additional purchase price adjustments may be recorded during the measurement period. The Company will reflect measurement period adjustments in the period in which the adjustments are recognized.

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Fair Value Measurements

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

4. Fair Value Measurements

The carrying amounts of cash and cash equivalents, other investments, accounts receivable, accounts payable and accrued expenses approximate fair value as of December 31, 2020 and September 30, 2021 because of the relatively short duration of these instruments.

The Company evaluated its financial assets and liabilities subject to fair value measurements on a recurring basis to determine the appropriate level in which to classify them for each reporting period.

The following table summarizes the assets measured at fair value as of December 31, 2020 and September 30, 2021:

	Fair value measurements on a recurring basis December 31, 2020
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	57,517	$	—	$	—	$	57,517
Other investments:
Time deposits	40,000		—		—		40,000
Total financial assets	$	97,517	$	—	$	—	$	97,517

    

	Fair value measurements on a recurring basis September 30, 2021
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	302,291	$	—	$	—	$	302,291
Total financial assets	$	302,291	$	—	$	—	$	302,291

As of September 30, 2021, the fair value of the 2026 and 2028 Convertible Notes, as further described in Note 9, “Debt”, was approximately $447,424 and $214,766, respectively. The fair value was determined based on the closing price for the Convertible Notes on the last trading day of the reporting period and is considered as Level 2 in the fair value hierarchy.

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Financial Statement Components

9 Months Ended

Sep. 30, 2021

Financial Statement Components [Abstract]

Financial Statement Components

5. Financial Statement Components

Accounts receivable, net of allowances consist of the following:

	As of December 31,		As of September 30,
	2020		2021
Trade accounts receivable	$	26,504	$	42,987
Unbilled accounts receivable	27,692		32,665
Allowance for doubtful accounts and reserve for expected credit losses	(1,203)		(1,467)
Other accounts receivable	2,250		976
Total accounts receivable, net	$	55,243	$	75,161

Components of allowance for doubtful accounts and reserve for expected credit losses are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Allowance for doubtful accounts:
Balance, beginning of period	$	(597)	$	(1,364)	$	(769)	$	(1,203)
Charged to bad debt expense	(312)		(169)		(492)		(475)
Deductions (1)	20		54		372		182
Impact of foreign currency translation	—		12		—		29
Balance, end of period	$	(889)	$	(1,467)	$	(889)	$	(1,467)

________________________

(1) Write off of uncollectible accounts after all collection efforts have been exhausted.

Accrued expenses and other current liabilities consisted of the following:

	As of December 31,		As of September 30,
	2020		2021
Accrued expense	$	31,549	$	39,444
Accrued compensation and benefits	19,534		17,341
Accrued sales, use, VAT and telecommunications related taxes	9,142		10,322
Current portion of finance lease	183		190
Obligation included in basis of acquired land	—		7,752
Other accrued expenses	2,657		1,210
Total accrued expenses and other current liabilities	$	63,065	$	76,259

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Right-of-Use Asset and Lease Liabilities

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Right-of-Use Asset and Lease Liabilities

6. Right-of-Use Asset and Lease Liabilities

Right-of-use (“ROU”) assets represent the Company’s right to use an underlying asset for the lease term, and lease liabilities represent the Company’s obligation to make lease payments arising from the lease. The Company determines if an arrangement is a lease at inception. ROU assets and liabilities are recognized at commencement date based on the present value of lease payments over the lease term. Operating lease expense attributable to lease payments is recognized on a straight-line basis over the lease term and is included in cost of sales and selling, general, and administrative expense on the Company’s condensed consolidated statements of operations. Finance leases result in the recognition of depreciation expense, which is recognized on a straight-line basis over the expected life of the leased asset, and interest expense, which is recognized following an effective interest rate method. Depreciation expense attributable to finance leases is included in cost of sales on the Company’s condensed consolidated statements of operations. The Company presents the operating leases in long-term assets and current and long-term liabilities in the accompanying condensed consolidated balance sheets. Finance leases are reported in property, plant and equipment, net, accrued expenses and other current liabilities, and other liabilities on the Company’s condensed consolidated balance sheets.

The Company sub-leases approximately 17,073 square feet of office space to a related party, Relay, Inc. (f/k/a Republic Wireless, Inc.) (“Relay”). Future minimum sub-lease receipts required under the non-cancellable lease are as follows:

	As of September 30,
	2021
2021 (remaining)	$	115
2022	249
	$	364

As of September 30, 2021, the Company had various leased properties in the United States and internationally, with remaining lease terms of nine months to 5.25 years, some of which include options to extend the leases for up to 5 years. None of the options to extend the leases are recognized in operating lease ROU assets or lease liabilities. The Company has one lease with an early-termination option, which it does not expect to exercise. The Company has one lease not yet commenced, with a lease term of 20 years and two options to extend the lease by a term of ten years each, up to twenty additional years in total.

The components of lease expense recorded in general and administrative expenses in the condensed consolidated statement of operations were as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021			2020		2021
Operating lease cost	$	1,461	$	1,699		$	4,383	$	5,002
Finance lease cost:
Depreciation of assets	—		60			—		165
Interest on lease liabilities	—		5			—		14
Sublease income (1)	(96)		(96)			(288)		(288)
Total net lease cost	$	1,365	$	1,668		$	4,095	$	4,893

________________________

(1) See Note 16, “Related Parties” to these condensed consolidated financial statements, for additional details on sublease income.

During the three and nine months ended September 30, 2020, short-term operating lease expense was $0. During the three and nine months ended September 30, 2021, short-term operating lease expense was $372 and $1,098, respectively.

Supplemental balance sheet information related to leases was as follows:

		As of December 31,		As of September 30,
Leases	Classification	2020		2021
Assets:
Operating lease assets	Operating right-of-use asset, net (1)	$	19,491	$	15,612
Finance lease assets	Property, plant and equipment, net (2)	464		408
Total leased assets		$	19,955	$	16,020
Liabilities:
Current
Operating	Operating lease liability, current	$	5,515	$	6,015
Finance	Accrued expenses and other current liabilities	183		190
Non-current
Operating	Operating lease liability, net of current portion	17,202		12,525
Finance	Other liabilities	282		224
Total lease liabilities		$	23,182	$	18,954

________________________

(1) Operating lease assets are recorded net of accumulated amortization of $9,083 and $13,298 as of December 31, 2020 and September 30, 2021, respectively.

(2) Finance lease assets are recorded net of accumulated depreciation of $28 and $187 as of December 31, 2020 and September 30, 2021, respectively.

Supplemental cash flow and other information related to leases was as follows:

	Nine months ended September 30,
	2020			2021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	3,944		$	4,535
Financing cash flows from finance leases	—			161
	$	3,944		$	4,696
Weighted average remaining lease term (in years)
Operating leases	3.65			3.14
Finance leases	—			2.56
Weighted average discount rate
Operating leases	4.99		%	4.77		%
Finance leases	—		%	4.00		%

Maturities of lease liabilities were as follows:

	As of September 30, 2021
	Operating Leases		Finance Leases
2021 (remaining)	$	1,362	$	59
2022	6,991		182
2023	6,615		109
2024	2,665		74
2025	1,640		11
Thereafter	709		—
Total lease payments	19,982		435
Less: imputed interest	(1,442)		(21)
Total lease obligations	18,540		414
Less: current obligations	(6,015)		(190)
Long-term lease obligations	$	12,525	$	224

On June 4, 2021, the Company purchased approximately 40 acres of undeveloped land (the “Property”) in Raleigh, North Carolina, from the State of North Carolina (the “State”). The Company paid $30,017 for the land. Additionally, as consideration for the Property, the Company agreed to construct, at its expense, a parking lot and related improvements (the “Parking Improvements”) on land owned by the State adjacent to the Property. The estimated cost of construction of the Parking Improvements was $7,752. Subsequent to the purchase of the Property, the Company sold a portion of the Property constituting approximately 23.76 acres (the “Conveyed Parcel”) to USEF Edwards Mill Owner, LLC (the “Developer”) for $17,462. In addition, the Developer agreed to construct, at its expense, the Parking Improvements in connection with the Company’s purchase of the Property from the State. The Company retained approximately 17.06 acres of the Property, which was recorded at cost and is included in the Company’s condensed consolidated balance sheet as a component property, plant and equipment, net. The Company recorded a liability to construct the Parking Improvements, which is included as a component of accrued expenses and other current liabilities in the condensed consolidated balance sheet as of September 30, 2021. The Company recorded an asset for the Developer’s obligation to construct the Parking Improvements at the Developer's expense, which is included as a component of prepaid expenses and other current assets in the condensed consolidated balance sheet as of September 30, 2021. A lease incentive of $3,193 was recognized for the difference between the consideration received from the Developer for the Conveyed Parcel and the cost basis of the Conveyed Parcel and is included as a component of other liabilities on the condensed consolidated balance sheet. On October 1, 2021, the developer delivered the completed parking improvements and the State released the Company from its liability.

On May 27, 2021, the Company entered into a Lease Agreement (the “Lease”) with the Developer for the Conveyed Parcel, together with improvements for office and related infrastructure to be constructed thereon, collectively constituting approximately 534,000 gross square feet (the “Project”). The lease became effective upon closing of the sale of the Conveyed Parcel to the Developer. When construction of the Project is completed, the Company intends to relocate its corporate headquarters to the Project. The lease term will commence upon substantial completion of the final building to be delivered, as evidenced by a certificate of occupancy issued by the City of Raleigh (the “Commencement Date”), and continue for a period of twenty (20) years (the “Initial Term”). It is anticipated that the Commencement Date will occur in May 2023. The Company has the option to renew the Initial Term for two ten-year periods at a rental rate equal to 100% of the then-prevailing market rental rate for comparable buildings in the Raleigh, North Carolina, market. Upon the effective date, the Company deposited $2,500 with the Developer as security on the lease. The deposit is included in other long-term assets on the Company’s condensed consolidated balance sheet. Additionally, the Company placed $3,000 in escrow to fund the certain tenant improvements expected to be constructed as part of the development of the Project.

No right-of-use assets or lease liabilities have been recognized in connection with the lease as of September 30, 2021. Future lease payments are included in Note 13, “Commitments and Contingencies”.

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Property, Plant and Equipment

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment

7. Property, Plant and Equipment

Property, plant and equipment, net consisted of the following:    

	As of December 31,		As of September 30,
	2020		2021
Furniture and fixtures	$	2,341	$	2,179
Computer and office equipment	4,077		4,885
Telecommunications equipment	60,651		68,596
Leasehold improvements	6,285		6,260
Software	3,901		4,994
Internal-use software development	19,968		22,930
Automobile	502		605
Land	—		16,394
Total cost	97,725		126,843
Less—accumulated depreciation	(46,080)		(58,576)
Total property, plant and equipment, net	$	51,645	$	68,267

The Company capitalized $348 and $1,846 of software development costs for the three and nine months ended September 30, 2020, respectively, and $808 and $3,212 for the three and nine months ended September 30, 2021, respectively.

Amortization expense related to capitalized software development costs were $377 and $1,547 for the three and nine months ended September 30, 2020, respectively, and $459 and $1,404 for the three and nine months ended September 30, 2021, respectively. As of September 30, 2021, unamortized implementation costs related to cloud computing arrangements are $464, of which $140 are included in prepaid expenses and other current assets and $324 are included in other long-term assets.

The Company leases automobiles under leases accounted for as finance leases with expiration dates ranging from December 31, 2021 to June 30, 2025. As of September 30, 2021, cost and accumulated depreciation of the assets under finance leases recorded by the Company were $595 and $187, respectively.

The Company recognized depreciation expense, which includes amortization of capitalized software development costs, as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	2,284	$	2,976	$	6,958	$	8,947
Research and development	197		296		441		829
Sales and marketing	30		32		90		90
General and administrative	646		1,165		2,048		3,117
Total depreciation expense	$	3,157	$	4,469	$	9,537	$	12,983

XML

Intangible Assets

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets

8. Intangible Assets

Intangible assets, net consisted of the following as of December 31, 2020:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,111)	$	5,285	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquistion and other intangible assets	15,093		(9,044)		6,049
Voxbone acquistion:
Customer relationships	156,559		(1,739)		154,820		15
Developed technology	88,664		(1,478)		87,186		10
Total Voxbone acquisition	245,223		(3,217)		242,006
Total intangible assets, net	$	260,316	$	(12,261)	$	248,055

Intangible assets, net consisted of the following as of September 30, 2021:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,501)	$	4,895	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquisition and other intangible assets	15,093		(9,434)		5,659
Voxbone acquisition:
Customer relationships	147,874		(9,037)		138,837		15
Developed technology	83,746		(7,676)		76,070		10
Total Voxbone acquisition	231,620		(16,713)		214,907
Total intangible assets, net	$	246,713	$	(26,147)	$	220,566

The Company recognized amortization expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	—	$	2,128	$	—	$	6,479
General and administrative	130		2,636		390		8,016
Total amortization expense	$	130	$	4,764	$	390	$	14,495

The remaining weighted average amortization period for definite lived intangible assets is 12.2 years.

Future estimated amortization expense for definite lived intangible assets is as follows:

	As of September 30,
	2021
2021 (remaining)	$	4,688
2022	18,753
2023	18,753
2024	18,753
2025	18,753
Thereafter	140,102
	$	219,802

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Debt

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt

9. Debt

Revolving Loan

On May 25, 2021, the Company terminated the Credit and Security Agreement, dated as of November 4, 2016 as amended and restated as of March 1, 2019, among the Company, Key Bank National Association, and KeyBanc Capital Markets Inc. (the “Credit Agreement”). The agreement provided for a secured $25,000 revolving credit facility (the “Credit Facility”). As of December 31, 2020 and at the date of termination, no outstanding indebtedness existed under the Credit Facility and the Company was in compliance with all financial and non-financial covenants.

As of December 31, 2020, unamortized debt issuance costs were $83, of which $74 were included in prepaid expenses and other current assets and $9 were included in other long-term assets. As of September 30, 2021, the outstanding debt issuance costs were $0.

Convertible Senior Notes and Capped Call Transactions

2026 Convertible Notes

On February 28, 2020, the Company issued $400,000 aggregate principal amount of 0.25% Convertible Notes due March 1, 2026 in a private placement to qualified institutional buyers pursuant to Rule 144A under the

Securities Act (the “2026 Convertible Notes”). The interest on the 2026 Convertible Notes is payable semi-annually in arrears on March 1 and September 1 of each year, beginning on September 1, 2020.

The 2026 Convertible Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2026 Convertible Notes (the “2026 Indenture”) or if the 2026 Convertible Notes are not freely tradeable as required by the 2026 Indenture. The 2026 Convertible Notes will mature on March 1, 2026, unless earlier repurchased, redeemed by the Company, or converted pursuant to their terms. The total net proceeds from the 2026 Convertible Notes, after deducting initial purchaser discounts, costs related to the 2026 Capped Calls (as defined herein), and debt issuance costs, paid by the Company, were approximately $344,722.

Each $1 principal amount of the 2026 Convertible Notes is initially convertible into 10.9857 shares of the Company's Class A common stock, par value $0.001 per share, which is equivalent to an initial conversion price of approximately $91.03 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change, as defined in the 2026 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2026 Convertible Notes in connection with such make-whole fundamental change or during the relevant redemption period.

The 2026 Convertible Notes will be redeemable in whole or in part at the Company's option on or after March 6, 2023, but before the fortieth (40th) scheduled trading day before the maturity date, at a cash redemption price equal to 100% of the principal amount of the 2026 Convertible Notes to be redeemed, plus accrued and unpaid interest, if any, if the last reported sale price of the Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading days ending on, and including, the trading day immediately before the date the redemption notices were sent; and the trading day immediately before such notices were sent.

Prior to the close of business on the business day immediately preceding September 1, 2025, the 2026 Convertible Notes may be convertible at the option of the holders only under the following circumstances:

(1)during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price per share of the Company's Class A common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

(2)during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1 principal amount of 2026 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company's Class A common stock on such trading day and the conversion rate on such trading day;

(3)upon the occurrence of certain corporate events or distributions on its Class A common stock; and

(4)if the Company calls such 2026 Convertible Notes for redemption.

On or after September 1, 2025, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2026 Convertible Notes may, at their option, convert all or a portion of their 2026 Convertible Notes regardless of the foregoing conditions.

Prior to and during the three and nine months ended September 30, 2021, the conditional conversion feature of the 2026 Convertible Notes was triggered as the last reported sale price of the Company's Class A common stock

was more than or equal to 130% of the conversion price for at least 20 trading days (whether or not consecutive) in the period of 30 consecutive trading days ending on or after June 30, 2020 (the last trading day of the calendar quarter), and therefore the 2026 Convertible Notes were convertible, in whole or in part, at the option of the holders between July 1, 2020 through September 30, 2021. Whether the 2026 Convertible Notes will be convertible following such period will depend on the continued satisfaction of this condition or another conversion condition in the future. The Company continues to classify the 2026 Convertible Notes as a long-term liability in its condensed consolidated balance sheet as of September 30, 2021, based on contractual settlement provisions.

Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A common stock, or a combination of cash and shares of Class A common stock, at the Company's election. It is the Company's current intent to settle the principal amount of the 2026 Convertible Notes with cash.

No sinking fund is provided for the 2026 Convertible Notes. Upon the occurrence of a fundamental change (as defined in the 2026 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2026 Convertible Notes for cash at a price equal to the principal amount of the 2026 Convertible Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In accounting for the issuance of the 2026 Convertible Notes, the Company separated the 2026 Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $125,160 and was determined by deducting the fair value of the liability component from the par value of the 2026 Convertible Notes. The difference represents the debt discount that is amortized to interest expense at an effective interest rate of 6.763% over the term of the 2026 Convertible Notes. The carrying amount of the equity component was $57,491 and is recorded in additional paid-in-capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense at an annual effective interest rate of 6.907% over the contractual terms of the 2026 Convertible Notes.

In accounting for the transaction costs related to the 2026 Convertible Notes, the Company allocated the total amount incurred to the liability and equity components of the 2026 Convertible Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were approximately $8,217, were recorded as an additional debt discount and are amortized to interest expense using the effective interest method over the contractual terms of the 2026 Convertible Notes. Issuance costs attributable to the equity component of $3,742 were netted with the equity component in stockholders’ equity.

2028 Convertible Notes

On March 16, 2021, the Company issued $250,000 aggregate principal amount of 0.50% Convertible Notes due April 1, 2028 in a private placement to qualified institutional buyers pursuant to Rule 144A under the Securities Act (the “2028 Convertible Notes and, together with the 2026 Convertible Notes, the “Convertible Notes”). The interest on the 2028 Convertible Notes is payable semi-annually in arrears on April 1 and October 1 of each year, beginning on October 1, 2021.

The 2028 Convertible Notes may bear special interest under specified circumstances relating to the Company's failure to comply with its reporting obligations under the indenture governing the 2028 Convertible Notes (the “2028 Indenture”) or if the 2028 Convertible Notes are not freely tradeable as required by the 2028 Indenture. The 2028 Convertible Notes will mature on April 1, 2028, unless earlier repurchased, redeemed by the Company, or converted pursuant to their terms. The total net proceeds from the 2028 Convertible Notes, after deducting initial purchaser discounts, costs related to the 2028 Capped Calls (as defined herein), and debt issuance costs, paid by the Company, were approximately $216,956.

Each $1 principal amount of the 2028 Convertible Notes is initially convertible into 5.5781 shares of the Company's Class A common stock, par value $0.001 per share, which is equivalent to an initial conversion price of approximately $179.27 per share. The conversion rate is subject to adjustment upon the occurrence of certain specified events but will not be adjusted for any accrued and unpaid special interest. In addition, upon the occurrence of a make-whole fundamental change, as defined in the 2028 Indenture, the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its 2028 Convertible Notes in connection with such make-whole fundamental change or during the relevant redemption period.

The 2028 Convertible Notes will be redeemable in whole or in part at the Company's option on or after April 6, 2025, but before the fortieth (40th) scheduled trading day before the maturity date, at a cash redemption price equal to 100% of the principal amount of the 2028 Convertible Notes to be redeemed, plus accrued and unpaid interest, if any, if the last reported sale price of the Class A common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading days ending on, and including, the trading day immediately before the date the redemption notices were sent; and the trading day immediately before such notices were sent.

On or after April 6, 2025 until the close of business on the scheduled trading day immediately preceding the maturity date, the 2028 Convertible Notes may be convertible at the option of the holders only under the following circumstances:

(1)during any calendar quarter commencing after the calendar quarter ending on June 30, 2021 (and only during such calendar quarter), if the last reported sale price per share of the Company's Class A common stock exceeds 130% of the conversion price for each of at least 20 trading days, whether or not consecutive, during the 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter;

(2)during the five consecutive business days immediately after any 10 consecutive trading day period (such 10 consecutive trading day period, the “measurement period”) in which the trading price per $1 principal amount of 2028 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price per share of the Company's Class A common stock on such trading day and the conversion rate on such trading day;

(3)upon the occurrence of certain corporate events or distributions on its Class A common stock; and

(4)if the Company calls such 2028 Convertible Notes for redemption.

On or after October 1, 2027, until the close of business on the second scheduled trading day immediately preceding the maturity date, holders of the 2028 Convertible Notes may, at their option, convert all or a portion of their Convertible Notes regardless of the foregoing conditions.

Upon conversion, the Company will pay or deliver, as the case may be, cash, shares of Class A common stock, or a combination of cash and shares of Class A common stock, at the Company's election. It is the Company's current intent to settle the principal amount of the 2028 Convertible Notes with cash.

No sinking fund is provided for the 2028 Convertible Notes. Upon the occurrence of a fundamental change (as defined in the 2028 Indenture) prior to the maturity date, holders may require the Company to repurchase all or a portion of the 2028 Convertible Notes for cash at a price equal to the principal amount of the 2028 Convertible Notes to be repurchased, plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

In accounting for the issuance of the 2028 Convertible Notes, the Company separated the 2028 Convertible Notes into liability and equity components. The carrying amount of the liability component was calculated by

measuring the fair value of a similar debt instrument that does not have an associated convertible feature. The carrying amount of the equity component representing the conversion option was $66,908 and was determined by deducting the fair value of the liability component from the par value of the 2028 Convertible Notes. The difference represents the debt discount that is amortized to interest expense at an effective interest rate of 5.125% over the term of the 2028 Convertible Notes. The carrying amount of the equity component was $39,389 and is recorded in additional paid-in-capital. The equity component is not remeasured as long as it continues to meet the conditions for equity classification. The excess of the principal amount of the liability component over its carrying amount, or the debt discount, is amortized to interest expense at an annual effective interest rate of 4.959% over the contractual terms of the 2028 Convertible Notes.

In accounting for the transaction costs related to the 2028 Convertible Notes, the Company allocated the total amount incurred to the liability and equity components of the 2028 Convertible Notes based on the proportion of the proceeds allocated to the debt and equity components. Issuance costs attributable to the liability component were approximately $5,525, were recorded as an additional debt discount and are amortized to interest expense using the effective interest method over the contractual terms of the 2028 Convertible Notes. Issuance costs attributable to the equity component of $2,019 were netted with the equity component in stockholders’ equity.

The net carrying amount of the liability components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Principal	$	400,000	$	400,000
Unamortized discount	(110,546)		(96,782)
Unamortized debt issuance costs	(7,258)		(6,354)
2026 Convertible Notes net carrying amount	282,196		296,864
2028 Convertible Notes:
Principal	—		250,000
Unamortized discount	—		(62,542)
Unamortized debt issuance costs	—		(5,167)
2028 Convertible Notes net carrying amount	—		182,291
Total net carrying amount	$	282,196	$	479,155

The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	$	125,152	$	125,152
Issuance costs	(3,742)		(3,742)
2026 Convertible Notes net carrying amount	121,410		121,410
2028 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	—		66,908
Issuance costs	—		(2,019)
2028 Convertible Notes net carrying amount	—		64,889
Total net carrying amount	$	121,410	$	186,299

The following table sets forth the interest expense recognized related to the 2026 and 2028 Convertible Notes:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
2026 Convertible Notes:
Contractual interest expense	$	246	$	250	$	591	$	750
Amortization of debt discount	4,292		4,664		10,183		13,761
Amortization of debt issuance costs	283		306		669		903
Total interest expense related to the 2026 Convertible Notes	4,821		5,220		11,443		15,414
2028 Convertible Notes:
Contractual interest expense	—		313		—		678
Amortization of debt discount	—		2,029		—		4,366
Amortization of debt issuance costs	—		168		—		362
Total interest expense related to the 2028 Convertible Notes	—		2,510		—		5,406
Total interest expense	$	4,821	$	7,730	$	11,443	$	20,820

In connection with the offering of the 2026 Convertible Notes and the 2028 Convertible Notes, the Company entered into privately negotiated capped call transactions with certain counterparties (the “2026 Capped Calls” and the “2028 Capped Calls,” respectively and, collectively, the “Capped Calls”). The 2026 Capped Calls and the 2028 Capped Calls each have an initial strike price of approximately $91.03 and $179.27 per share, respectively, subject to certain adjustments, which corresponds to the initial conversion price of the 2026 Convertible Notes and the 2028 Convertible Notes. The 2026 Capped Calls and the 2028 Capped Calls have initial cap prices of $137.40 and $260.76 per share subject to certain adjustments, respectively. The 2026 Capped Calls and the 2028 Capped Calls cover, subject to anti-dilution adjustments, approximately 4,394,276 and 1,394,525 shares of Class A common stock for the 2026 Convertible Notes and 2028 Convertible Notes, respectively. The Capped Calls are generally intended to reduce or offset the potential dilution to the Class A common stock upon any conversion of the 2026 Convertible Notes and 2028 Convertible Notes with such reduction or offset, as the case

may be, subject to a cap based on the cap price. The Capped Calls expire on the earlier of (i) the last day on which any convertible securities remain outstanding and (ii) March 1, 2026 for the 2026 Capped Calls and April 1, 2028 for the 2028 Capped Calls, subject to earlier exercise. The Capped Calls are subject to either adjustment or termination upon the occurrence of specified extraordinary events affecting the Company, including a merger event, a tender offer, and a nationalization, insolvency or delisting involving the Company. In addition, the Capped Calls are subject to certain specified additional disruption events that may give rise to a termination of the Capped Calls, including changes in law, insolvency filings, and hedging disruptions. The Capped Call transactions are recorded in stockholders’ equity and are not accounted for as derivatives. The net cost of $43,320 and $25,500 incurred to purchase the 2026 Capped Calls and the 2028 Capped Calls, respectively, was recorded as a reduction to additional paid-in capital in the accompanying condensed consolidated balance sheets.

The Convertible Notes are effectively subordinated to the Company’s future senior secured indebtedness, if any, to the extent of the value of the collateral securing that indebtedness. The Convertible notes are the senior, unsecured obligations of the Company and are equal in right of payment with the Company’s future senior unsecured indebtedness, if any, senior in right of payment to the Company’s existing and future indebtedness that is expressly subordinated to the Convertible Notes and the Convertible Notes will be structurally subordinated to all existing and future indebtedness and other liabilities, including trade payables, and preferred equity, if any, of the Company’s subsidiaries.

XML

Segment and Geographic Information

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment and Geographic Information

10. Segment and Geographic Information

The Company has two reportable segments, CPaaS and Other. Segments are primarily evaluated based on revenue and gross profit. The Company does not allocate operating expenses, interest expense or income tax expense to its segments. Accordingly, the Company does not report such information. Additionally, the Chief Operating Decision Maker does not evaluate the Company’s operating segments using discrete asset information. The segments share the majority of the Company’s assets. Therefore, no segment asset information is reported.

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
Revenue	$	73,762	$	107,376	$	199,959	$	312,561
Cost of revenue	39,346		54,841		108,467		164,616
Gross profit	$	34,416	$	52,535	$	91,492	$	147,945
Other
Revenue	$	10,996	$	23,262	$	30,107	$	52,214
Cost of revenue	6,181		17,554		15,428		35,166
Gross profit	$	4,815	$	5,708	$	14,679	$	17,048
Consolidated
Revenue	$	84,758	$	130,638	$	230,066	$	364,775
Cost of revenue	45,527		72,395		123,895		199,782
Gross profit	$	39,231	$	58,243	$	106,171	$	164,993

The Company’s long-lived assets were primarily held in the United States as of December 31, 2020 and September 30, 2021. As of December 31, 2020 and September 30, 2021, long-lived assets held outside of the United States were $11,249 and $10,156, respectively.

The Company generates its revenue primarily in the United States. Revenue by geographic area is detailed in the table below (which is determined based on the customer billing address):

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
United States	$	71,809	$	94,135	$	194,414	$	275,986
International	1,953		13,241		5,545		36,575
Total	$	73,762	$	107,376	$	199,959	$	312,561
Other
United States	$	10,584	$	20,924	$	29,127	$	46,776
International	412		2,338		980		5,438
Total	$	10,996	$	23,262	$	30,107	$	52,214

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Stockholders' Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Stockholders' Equity

11. Stockholders’ Equity

Preferred Stock

As of December 31, 2020 and September 30, 2021, the Company had authorized 10,000,000 shares of undesignated preferred stock, par value $0.001, of which no shares were issued and outstanding.

Common Stock

As of December 31, 2020 and September 30, 2021, the Company had authorized 100,000,000 shares of Class A common stock, par value $0.001 per share, with one vote per share and 20,000,000 shares of Class B common stock, par value $0.001 per share, with ten votes per share. As of December 31, 2020, 22,413,004 and 2,496,125 shares of Class A common stock and Class B common stock, respectively, were issued and outstanding. As of September 30, 2021, 23,165,119 and 1,965,170 shares of Class A common stock and Class B common stock, respectively, were issued and outstanding.

Shares of Class B common stock are convertible into shares of Class A common stock upon the stockholder’s voluntary written notice to the Company’s transfer agent or a transfer by the stockholder, subject to limited exceptions for transfers for estate planning purposes.

Reserved Shares

The Company had reserved shares of Class A common stock for issuance under stock-based award agreements as follows:

	As of December 31,	As of September 30,
	2020	2021
Stock options issued and outstanding	255,000	183,271
Nonvested restricted stock units issued and outstanding	450,614	369,614
Stock-based awards available for grant under the 2017 Plan	2,020,342	3,048,353
	2,725,956	3,601,238

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Stock Based Compensation

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Stock Based Compensation

12. Stock Based Compensation

2010 Stock Option Plan

As of July 26, 2010, the Company adopted the 2010 Equity Compensation Plan (the “2010 Plan”). On November 9, 2017, the 2010 Plan was terminated in connection with the Company’s initial public offering. Accordingly, no shares are available for future issuance under the 2010 Plan. However, the 2010 Plan continues to govern the terms and conditions of the outstanding awards granted thereunder.

2017 Incentive Award Plan

The Company’s 2017 Incentive Award Plan (the “2017 Plan”) became effective on November 9, 2017. The 2017 Plan provides for the grant of stock options, including incentive stock options and non-qualified stock options, stock appreciation rights, restricted stock, dividend equivalents, restricted stock units, and other stock or cash based awards to employees, consultants and directors of the Company. A total of 1,050,000 shares of the Company’s Class A common stock were originally reserved for issuance under the 2017 Plan. These available shares automatically increase each January 1, beginning on January 1, 2018, by 5% of the number of shares of the Company’s Class A common stock outstanding on the final day of the immediately preceding calendar year. On January 1, 2021, the shares available for grant under the 2017 Plan were automatically increased by 1,120,650 shares.

The terms of the stock option grants are determined by the Company’s Board of Directors. The Company’s stock options vest based on terms of the stock option agreements, which is generally over four years. The stock options have a contractual life of ten years.

Restricted stock units (“RSUs”) granted under the 2017 Plan are generally subject to a time-based vesting condition. The compensation expense related to these awards is based on the grant date fair value of the RSUs and is recognized on a ratable basis over the applicable service period. The Company granted RSUs to its non-employee members of the Board of Directors, some of which vested immediately while others vest 25% as of each calendar quarter immediately following the grant date. Certain RSUs awarded to executives vest over four years with 50% vesting in the first year in 12.5% increments on each calendar quarter immediately following the grant date and the remaining 50% earned over years two, three and four. Other RSUs awarded to executives and employees generally are earned over a service period of four years.

Stock Options

The following summarizes the stock option activity for the periods presented:

	Number of options outstanding	Weighted- average exercise price (per share)		Weighted- average remaining contract life (in years)	Aggregate intrinsic value  (in thousands)
Outstanding as of December 31, 2020	255,000	$	10.82	4.42	$	36,426
Granted	—	—
Exercised	(70,923)	12.68			9,059
Forfeited or cancelled	(806)	10.49
Outstanding as of September 30, 2021	183,271	$	10.10	3.59	$	14,694
Options vested and exercisable at September 30, 2021	178,878	$	9.79	3.53	$	14,398
Options vested and expected to vest as of September 30, 2021	183,032	$	10.09	3.59	$	14,678

Aggregate intrinsic value is computed based on the difference between the option exercise price and the fair value of the Company’s common stock as of September 30, 2021, based on the Company’s Class A common stock price as reported on the NASDAQ Global Select Market.

No options were granted for the three and nine months ended September 30, 2020 and 2021.

The total estimated grant date fair value of options vested was $193 and $322 for the three and nine months ended September 30, 2020, respectively, and $153 and $199 for the three and nine months ended September 30, 2021, respectively.

As of September 30, 2021, total unrecognized compensation cost related to all non-vested stock options was $5, which will be amortized over a weighted-average period of 0.09 years.

Restricted Stock Units

The following summarizes the RSU activity for the periods presented:

	Number of awards outstanding	Weighted-average grant date fair value (per share)
Nonvested RSUs as of December 31, 2020	450,614	$	51.58
Granted	146,989	146.80
Vested	(173,695)	62.13
Forfeited or cancelled	(54,294)	74.82
Nonvested RSUs as of September 30, 2021	369,614	$	84.11

As of September 30, 2021, total unrecognized compensation cost related to non-vested RSUs was $25,509, which will be amortized over a weighted-average period of 2.86 years.

Stock-Based Compensation Expense

The Company recognized total stock-based compensation expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	46	$	52	$	161	$	190
Research and development	508		621		1,581		2,055
Sales and marketing	369		519		1,140		1,591
General and administrative	1,459		2,633		4,424		7,756
Total	$	2,382	$	3,825	$	7,306	$	11,592

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

13. Commitments and Contingencies

Operating Leases

The Company leases office space under operating lease agreements that expire over the next 5.25 years. See Note 6, “Right-of-Use Asset and Lease Liabilities” to the condensed consolidated financial statements, for additional details on the Company's operating lease commitments.

Contractual Obligations

On October 25, 2015, the Company entered into an agreement with a telecommunications service provider. The service agreement requires the Company to pay a monthly recurring charge associated with the services received. The service agreement is non-cancellable and contains annual minimum commitments. On August 1, 2020, the Company amended the agreement to require annual minimum commitments of $600 and $300 in 2021 and 2022, respectively. In addition, as of September 30, 2021, the Company has $17,287 in other non-cancellable purchase obligations, consisting of primarily network equipment maintenance and software license contracts, of which $11,824 will be fulfilled within one year.

On May 27, 2021, the Company entered into the Lease with the Developer for the Conveyed Parcel, together with the Project. The respective obligations of the Company and the Developer under the Lease were conditioned upon the Developer acquiring fee simple title to the Conveyed Parcel, which occurred on June 4, 2021. The Lease term will commence upon the Commencement Date and continue for the Initial Term. It is anticipated that the Commencement Date will occur in May 2023. If the Commencement Date does not occur within one hundred twenty (120) days from the scheduled Commencement Date, the Company shall be entitled to certain rent abatements, as described in the Lease. If the Commencement Date is not delivered within twelve (12) months of the scheduled Commencement Date, the Company may terminate the Lease.

The Company has the option to renew the Initial Term for two ten-year periods. Base rent payments will begin on the Commencement Date. The initial base rent will increase by 1.85% on each anniversary of the Commencement Date. Total lease payments over the Initial Term are approximately $496,000. See Note 6, “Right-of-Use Asset and Lease Liabilities” to the condensed consolidated financial statements, for additional details on the Company's operating lease commitments.

Legal Matters

The Company is involved as a defendant in various litigation, including but not limited to lawsuits alleging that the Company failed to bill, collect and remit certain taxes and surcharges associated with the provision of 911 services pursuant to applicable laws in various jurisdictions.

While the results of these legal proceedings cannot be predicted with certainty, in the opinion of management, the ultimate resolution of these matters will not have a material adverse effect on the Company’s financial position or results of operations.

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Employee Benefit Plans

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Employee Benefit Plans

14. Employee Benefit Plans

The Company sponsors a U.S. defined contribution 401(k), which allows eligible U.S.-based employees to defer a portion of their compensation. The Company, at its discretion, may make matching contributions. With the acquisition of Voxbone S.A. on November 1, 2020, the Company assumed sponsorship for Voxbone S.A.’s U.S. defined contribution 401(k). In connection with that acquisition, the Company also assumed sponsorship for a non-U.S. defined contribution plan for which it pays fixed contributions into a separate entity. The Company has no legal or constructive obligations to pay further contributions if the fund does not hold sufficient assets to pay all employees the benefits relating to employee service in the current or prior periods. The contributions are recognized as employee benefit expense when they are due. The Company made matching contributions for the defined contribution plans of $474 and $1,583 for the three and nine months ended September 30, 2020, respectively, and $811 and $2,565 for the three and nine months ended September 30, 2021, respectively.

In addition, as a result of the acquisition of Voxbone S.A., the Company assumed sponsorship for Voxbone S.A.’s non-U.S. defined benefit pension plans. The liability recognized in the other liabilities line item of the balance sheet in respect to these plans is the present value of the defined benefit obligation at the end of the reporting period less the fair value of the plan assets. The defined benefit obligation is calculated annually by an independent actuary using the Projected Unit Credit Method.

The Company reports the service cost component of net periodic benefit cost in the same line item as other compensation costs arising from the services rendered by the employee and records the other components of net periodic benefit cost in other expense, net. Net periodic benefit costs for the non-U.S. defined benefit pension plan were $0 for the three and nine months ended September 30, 2020, and $105 and $323 for the three and nine months ended September 30, 2021, respectively.

Pretax amounts for net periodic benefit cost and other amounts for the defined benefit pension plans consisted of the following components:

	Three months ended September 30,			Nine months ended September 30,
	2021			2021
Service cost	$	104		$	318
Interest cost	5			16
Return on plan assets	(4)			(11)
Net periodic pension cost	105			323
Total recognized in net periodic benefit cost	$	105		$	323
Defined benefit cost:
Expected long-term rate of return on plan assets	0.50		%	0.50		%

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Income Taxes

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

15. Income Taxes

At the end of each interim reporting period, the Company determines the income tax provision by using an estimate of the annual effective tax rate, adjusted for discrete items occurring in the quarter. The effective income tax rate reflects the effect of federal and state income taxes and the permanent impacts of differences in book and tax accounting.

The Company’s effective tax rate was (0.4)% and (134.2)% for the three and nine months ended September 30, 2020, respectively, and (4.8)% and (1.3)% for the three and nine months ended September 30, 2021, respectively. The change in tax rate is primarily due to the valuation allowance recorded against U.S. deferred tax assets and the mix of earnings between various jurisdictions. The Company continues to maintain a valuation allowance for its U.S. federal and state net deferred tax assets.

Judgment is required in determining whether deferred tax assets will be realized in full or in part. Management assesses the available positive and negative evidence on a jurisdictional basis to estimate if deferred tax assets will be recognized and when it is more likely than not that all or some deferred tax assets will not be realized, and a valuation allowance must be established.

The Company’s effective tax rate for the three and nine months ended September 30, 2021 is lower than the U.S. federal statutory rate of 21.0% primarily due to the valuation allowance recorded against U.S. deferred tax assets.

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Related Parties

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Related Parties

16. Related Parties

The Company has certain involvement with Relay, Inc. (f/k/a Republic Wireless, Inc.) (“Relay”) via ongoing services arrangements, with these ongoing services arrangements creating a variable interest in Relay.

The Company recorded a reduction of rent expense under the Facilities Sharing Agreement of $96 and $288 for the three and nine months ended September 30, 2020, respectively, and $96 and $288 for the three and nine months ended September 30, 2021, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. No amounts were due to the Company under the Facilities Sharing Agreement as of December 31, 2020 and September 30, 2021.

The Company provided telecommunication services to Relay under the Master Services Agreement of $541 and $1,657 for the three and nine months ended September 30, 2020, respectively, and $425 and $1,374 for the three and nine months ended September 30, 2021, respectively. The Company recognized such amounts as revenue

in the accompanying condensed consolidated statements of operations. As of December 31, 2020 and September 30, 2021, the Company had a receivable of $170 and $142, respectively, under the Master Services Agreement.

Bandwidth had collected on behalf of, and remitted withholding tax to, Relay of $747 and $1,295 for the three and nine months ended September 30, 2020, respectively, and $16 and $360 for the three and nine months ended September 30, 2021, respectively, for Relay employees that exercised Bandwidth stock options. As of December 31, 2020 and September 30, 2021, the Company had amounts payable to Relay of $0 and $16, respectively.

The Company is compensated by Relay for services performed by the Company’s legal department based on costs incurred. The Company received net compensation of $16 and $63 for the three and nine months ended September 30, 2020, respectively, and $6 and $19 for the three and nine months ended September 30, 2021, respectively, which is included in general and administrative expenses in the condensed consolidated statements of operations. As of December 31, 2020 and September 30, 2021, the Company had a receivable of $2 under this agreement.

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Basic and Diluted Loss per Common Share

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Basic and Diluted Loss per Common Share

17. Basic and Diluted Loss per Common Share

Basic net loss per share is computed by dividing net loss by the weighted-average number of shares of common stock outstanding during the period. The Company is in a net loss position for the three and nine months ended September 30, 2020 and 2021 and therefore diluted shares equals basic shares.

The components of basic and diluted loss per share are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Earnings per share
Net loss attributable to common stockholders	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Net loss per share, basic and diluted	$	(0.10)	$	(0.28)	$	(1.01)	$	(0.77)
Weighted average number of common shares outstanding, basic and diluted	24,175,762		25,114,762		23,905,322		25,075,941

The following common share equivalents were excluded from the weighted average shares used to calculate net loss per common share because their effects would have been anti-dilutive:

	As of September 30,
	2020	2021
Stock options issued and outstanding	269,108	183,271
Restricted stock units issued and outstanding	447,449	369,614
Convertible senior notes (1)	708,073	1,316,199
Total	1,424,630	1,869,084

________________________

(1) As of September 30, 2020 and September 30, 2021, the Company used the treasury stock method to calculate the dilutive impact of the 2026 and 2028 Convertible Notes because at that time the Company expected to settle the principal amount of these notes in cash and any excess in shares of the Company's Class A common stock. As of September 30, 2020 and September 30, 2021, the conversion spread, calculated using the average market price of Class A common stock during the period consistent with the treasury stock method, had a dilutive impact for the 2026 Convertible Notes on diluted net income per share of Class A common stock when the average market price of the Company's Class A common stock for a given period exceeded the conversion price of $91.03 per share. As of September 30, 2021, the conversion spread for the 2028 Convertible Notes was anti-dilutive as the average market price of the Company's Class A common stock for a given period did not exceed the conversion price of $179.27 per share.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States of America (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (the “SEC”) regarding interim financial reporting. Certain information and disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K filed with the SEC on March 1, 2021.

The condensed consolidated balance sheet as of December 31, 2020, included herein, was derived from the audited financial statements as of that date, but does not include all disclosures, including certain notes required by GAAP on an annual reporting basis.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements reflect all normal recurring adjustments necessary to present fairly the financial position, results of operations, comprehensive loss and cash flows for the interim periods, but are not necessarily indicative of the results of operations to be anticipated for the full year 2021 or any future period.

Principles of Consolidation

Principles of Consolidation

The condensed consolidated financial statements include the accounts of Bandwidth Inc. and its wholly owned subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation.

Use of Estimates

Use of Estimates

The preparation of the Company’s condensed consolidated financial statements in conformity with GAAP requires the Company to make estimates and judgments that affect the amounts reported in these financial statements and accompanying notes. These estimates in the condensed consolidated financial statements include, but are not limited to, allowance for doubtful accounts, reserve for expected credit losses, reserve for sales credits, recoverability of long lived and intangible assets, fair value of acquired intangible assets and goodwill, discount rates used in the valuation of right-of-use assets and lease liabilities, the fair value of the liability and equity components of the Company’s Convertible Notes (as defined herein), estimated period of benefit, valuation allowances on deferred tax assets, certain accrued expenses and contingencies, economic and demographic actuarial assumptions related to pension and other postretirement benefit costs and liabilities, estimated cash flows on asset retirement obligation. Although the Company believes that the estimates it uses are reasonable, due to the inherent uncertainty involved in making these estimates, actual results reported in future periods could differ from those estimates.

Cash and Cash Equivalents and Restricted Cash

Cash and Cash Equivalents

The Company classifies all highly liquid investments with original stated maturities of three months or less from the date of purchase as cash equivalents. All highly liquid investments with original stated maturities of greater than three months from the date of purchase are classified as current marketable securities, with the exception of time deposits with maturities greater than ninety days which are classified as other investments. Cash deposits are primarily in financial institutions in the United States. However, cash for monthly operating costs of international operations are deposited in banks outside the United States. The Company has a policy of making investments only with commercial institutions that have at least an investment grade credit rating. The Company utilizes money market funds as an investment option and only invests in AAA rated funds.

Restricted Cash

Restricted cash consists primarily of the holdback amount and its accrued interest remaining to be paid to the selling stockholders of Voxbone, employee withholding tax liability and employee benefits contributions not yet remitted. The Company has classified this asset as a short-term asset in order to match the expected period of restriction.

Accounts Receivable

Accounts Receivable and Current Expected Credit Losses

Accounts receivable are stated at realizable value, net of allowances, which includes an allowance for doubtful accounts and a reserve for expected credit losses. The allowance for doubtful accounts is based on management’s assessment of the collectability of its customer accounts. The Company regularly reviews the composition of the accounts receivable aging, historical bad debts, changes in payment patterns, customer creditworthiness, current economic trends, and reasonable and supportable forecasts about the future. Relevant risk characteristics include customer size and historical loss patterns. Management has evaluated the expected credit losses related to trade accounts receivable and determined that allowances of approximately $1,203 and $1,467 for uncollectible accounts and customer balances that are disputed were required as of December 31, 2020 and September 30, 2021, respectively. Refer to Note 5, “Financial Statement Components” to these condensed consolidated financial statements, for a rollforward of the components of the allowances as of December 31, 2020 and September 30, 2021.

The Company includes unbilled receivables in its accounts receivable balance. Generally, these receivables represent earned revenue from services provided to customers, which will be billed in the next billing cycle. All

amounts are considered collectible and billable.

Current Expected Credit Losses

Accounts Receivable and Current Expected Credit Losses

Accounts receivable are stated at realizable value, net of allowances, which includes an allowance for doubtful accounts and a reserve for expected credit losses. The allowance for doubtful accounts is based on management’s assessment of the collectability of its customer accounts. The Company regularly reviews the composition of the accounts receivable aging, historical bad debts, changes in payment patterns, customer creditworthiness, current economic trends, and reasonable and supportable forecasts about the future. Relevant risk characteristics include customer size and historical loss patterns. Management has evaluated the expected credit losses related to trade accounts receivable and determined that allowances of approximately $1,203 and $1,467 for uncollectible accounts and customer balances that are disputed were required as of December 31, 2020 and September 30, 2021, respectively. Refer to Note 5, “Financial Statement Components” to these condensed consolidated financial statements, for a rollforward of the components of the allowances as of December 31, 2020 and September 30, 2021.

The Company includes unbilled receivables in its accounts receivable balance. Generally, these receivables represent earned revenue from services provided to customers, which will be billed in the next billing cycle. All

amounts are considered collectible and billable.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments that are exposed to concentration of credit risk consist primarily of cash and cash equivalents, other investments and trade accounts receivable. Cash deposits may be in excess of insured limits. The Company believes that the financial institutions that hold its cash deposits are financially sound and, accordingly, minimal credit risk exists with respect to these balances.

With regard to customers, credit evaluation and account monitoring procedures are used to minimize the risk of loss. The Company believes that no additional credit risk beyond amounts provided for by the allowance for doubtful accounts are inherent in accounts receivable.

Debt Issuance Costs

Debt Issuance CostsThe Company incurs debt issuance costs associated with obtaining and entering into credit agreements, including the issuances of convertible notes. These costs customarily include non-refundable structuring fees, commitment fees, up-front fees and syndication expenses. The Company has a policy of deferring and amortizing these costs based on the effective interest method over the term of the credit agreements.

Recently Adopted Accounting Standards and Recent Accounting Pronouncements Not Yet Adopted

Recently Adopted Accounting Standards

In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes, which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. ASU 2019-12 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020. The Company adopted this standard on January 1, 2021 on a prospective basis, which did not have a material impact on the Company’s financial statements.

Recent Accounting Pronouncements Not Yet Adopted

In May 2021, the FASB issued ASU 2021-04, Earnings Per Share (Topic 260), Debt —Modifications and Extinguishments (Subtopic 470-50), Compensation--Stock Compensation (Topic 718), and Derivatives and Hedging--Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to provide clarity surrounding the treatment for a modification or an exchange of a freestanding equity-classified written call option. The amendments also provide guidance for the recognition and measurement of earnings-per-share (“EPS”) for certain modifications or exchanges of freestanding equity-classified written call options for entities that present EPS. The amendments do not affect a holder’s accounting for freestanding call options. ASU 2021-04 is effective for fiscal years beginning after December 15, 2021, including interim periods within those fiscal years. Early adoption is permitted, including adoption in an interim period. The Company did not and does not expect to have any modification or exchanges of freestanding written call options classified in equity during the reporting period and therefore does not expect adoption will have a material impact on its financial statements.

In August 2020, the FASB issued ASU 2020-06, Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in Entity's Own Equity (Subtopic 815-40), which is intended to address issues identified as a result of the complexity associated with applying GAAP for certain financial instruments with characteristics of liabilities and equity. For convertible instruments, ASU 2020-06 reduces the number of accounting models for convertible debt instruments and convertible preferred stock, and enhances information transparency by making targeted improvements to the disclosures for convertible instruments and EPS guidance on the basis of feedback from financial statement users. ASU 2020-06 is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020, including interim periods within those fiscal years. The Company will adopt the new guidance on January 1, 2022 using the modified retrospective approach resulting in adjustments in accumulated deficit and paid in capital. The Company will also record an increase in the convertible notes balance as a result of the reversal of the separation of the convertible debt between debt and equity. The adoption of this standard will decrease the amount of non-cash interest expense to be recognized in future periods as a result of eliminating the discount associated with the equity component. The number of diluted shares will increase as a result of transitioning from the treasury stock method to the as-if converted method for the calculation. The Company is currently quantifying the effect of adopting this new accounting guidance on its financial statements and earnings per share calculations.

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Schedule of Assets Measured at Fair Value on a Recurring Basis

The following table summarizes the assets measured at fair value as of December 31, 2020 and September 30, 2021:

	Fair value measurements on a recurring basis December 31, 2020
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	57,517	$	—	$	—	$	57,517
Other investments:
Time deposits	40,000		—		—		40,000
Total financial assets	$	97,517	$	—	$	—	$	97,517

    

	Fair value measurements on a recurring basis September 30, 2021
	Level 1		Level 2		Level 3		Total
Financial assets:
Cash and cash equivalents:
Money market account	$	302,291	$	—	$	—	$	302,291
Total financial assets	$	302,291	$	—	$	—	$	302,291

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Financial Statement Components (Tables)

9 Months Ended

Sep. 30, 2021

Financial Statement Components [Abstract]

Schedule of Accounts Receivable, net, and Allowance for Doubtful Accounts

Accounts receivable, net of allowances consist of the following:

	As of December 31,		As of September 30,
	2020		2021
Trade accounts receivable	$	26,504	$	42,987
Unbilled accounts receivable	27,692		32,665
Allowance for doubtful accounts and reserve for expected credit losses	(1,203)		(1,467)
Other accounts receivable	2,250		976
Total accounts receivable, net	$	55,243	$	75,161

Components of allowance for doubtful accounts and reserve for expected credit losses are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Allowance for doubtful accounts:
Balance, beginning of period	$	(597)	$	(1,364)	$	(769)	$	(1,203)
Charged to bad debt expense	(312)		(169)		(492)		(475)
Deductions (1)	20		54		372		182
Impact of foreign currency translation	—		12		—		29
Balance, end of period	$	(889)	$	(1,467)	$	(889)	$	(1,467)

________________________

(1) Write off of uncollectible accounts after all collection efforts have been exhausted.

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following:

	As of December 31,		As of September 30,
	2020		2021
Accrued expense	$	31,549	$	39,444
Accrued compensation and benefits	19,534		17,341
Accrued sales, use, VAT and telecommunications related taxes	9,142		10,322
Current portion of finance lease	183		190
Obligation included in basis of acquired land	—		7,752
Other accrued expenses	2,657		1,210
Total accrued expenses and other current liabilities	$	63,065	$	76,259

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Right-of-Use Asset and Lease Liabilities (Tables)

9 Months Ended

Sep. 30, 2021

Leases [Abstract]

Schedule of Future Minimum Lease Receipts for Operating Lease

Future minimum sub-lease receipts required under the non-cancellable lease are as follows:

	As of September 30,
	2021
2021 (remaining)	$	115
2022	249
	$	364

Components of Lease Expense

The components of lease expense recorded in general and administrative expenses in the condensed consolidated statement of operations were as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021			2020		2021
Operating lease cost	$	1,461	$	1,699		$	4,383	$	5,002
Finance lease cost:
Depreciation of assets	—		60			—		165
Interest on lease liabilities	—		5			—		14
Sublease income (1)	(96)		(96)			(288)		(288)
Total net lease cost	$	1,365	$	1,668		$	4,095	$	4,893

________________________

(1) See Note 16, “Related Parties” to these condensed consolidated financial statements, for additional details on sublease income.

Supplemental cash flow and other information related to leases was as follows:

	Nine months ended September 30,
	2020			2021
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$	3,944		$	4,535
Financing cash flows from finance leases	—			161
	$	3,944		$	4,696
Weighted average remaining lease term (in years)
Operating leases	3.65			3.14
Finance leases	—			2.56
Weighted average discount rate
Operating leases	4.99		%	4.77		%
Finance leases	—		%	4.00		%

Supplemental Balance Sheet Lease Information

Supplemental balance sheet information related to leases was as follows:

		As of December 31,		As of September 30,
Leases	Classification	2020		2021
Assets:
Operating lease assets	Operating right-of-use asset, net (1)	$	19,491	$	15,612
Finance lease assets	Property, plant and equipment, net (2)	464		408
Total leased assets		$	19,955	$	16,020
Liabilities:
Current
Operating	Operating lease liability, current	$	5,515	$	6,015
Finance	Accrued expenses and other current liabilities	183		190
Non-current
Operating	Operating lease liability, net of current portion	17,202		12,525
Finance	Other liabilities	282		224
Total lease liabilities		$	23,182	$	18,954

________________________

(1) Operating lease assets are recorded net of accumulated amortization of $9,083 and $13,298 as of December 31, 2020 and September 30, 2021, respectively.

(2) Finance lease assets are recorded net of accumulated depreciation of $28 and $187 as of December 31, 2020 and September 30, 2021, respectively.

Schedule of Maturities of Operating Lease Liabilities

Maturities of lease liabilities were as follows:

	As of September 30, 2021
	Operating Leases		Finance Leases
2021 (remaining)	$	1,362	$	59
2022	6,991		182
2023	6,615		109
2024	2,665		74
2025	1,640		11
Thereafter	709		—
Total lease payments	19,982		435
Less: imputed interest	(1,442)		(21)
Total lease obligations	18,540		414
Less: current obligations	(6,015)		(190)
Long-term lease obligations	$	12,525	$	224

Schedule of Maturities of Finance Lease Liabilities

Maturities of lease liabilities were as follows:

	As of September 30, 2021
	Operating Leases		Finance Leases
2021 (remaining)	$	1,362	$	59
2022	6,991		182
2023	6,615		109
2024	2,665		74
2025	1,640		11
Thereafter	709		—
Total lease payments	19,982		435
Less: imputed interest	(1,442)		(21)
Total lease obligations	18,540		414
Less: current obligations	(6,015)		(190)
Long-term lease obligations	$	12,525	$	224

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Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property, Plant and Equipment [Abstract]

Summary of Property, Plant and Equipment, Net

Property, plant and equipment, net consisted of the following:    

	As of December 31,		As of September 30,
	2020		2021
Furniture and fixtures	$	2,341	$	2,179
Computer and office equipment	4,077		4,885
Telecommunications equipment	60,651		68,596
Leasehold improvements	6,285		6,260
Software	3,901		4,994
Internal-use software development	19,968		22,930
Automobile	502		605
Land	—		16,394
Total cost	97,725		126,843
Less—accumulated depreciation	(46,080)		(58,576)
Total property, plant and equipment, net	$	51,645	$	68,267

Schedule of Depreciation Expense

The Company recognized depreciation expense, which includes amortization of capitalized software development costs, as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	2,284	$	2,976	$	6,958	$	8,947
Research and development	197		296		441		829
Sales and marketing	30		32		90		90
General and administrative	646		1,165		2,048		3,117
Total depreciation expense	$	3,157	$	4,469	$	9,537	$	12,983

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Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Finite Lived Intangible Assets

Intangible assets, net consisted of the following as of December 31, 2020:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,111)	$	5,285	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquistion and other intangible assets	15,093		(9,044)		6,049
Voxbone acquistion:
Customer relationships	156,559		(1,739)		154,820		15
Developed technology	88,664		(1,478)		87,186		10
Total Voxbone acquisition	245,223		(3,217)		242,006
Total intangible assets, net	$	260,316	$	(12,261)	$	248,055

Intangible assets, net consisted of the following as of September 30, 2021:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,501)	$	4,895	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquisition and other intangible assets	15,093		(9,434)		5,659
Voxbone acquisition:
Customer relationships	147,874		(9,037)		138,837		15
Developed technology	83,746		(7,676)		76,070		10
Total Voxbone acquisition	231,620		(16,713)		214,907
Total intangible assets, net	$	246,713	$	(26,147)	$	220,566

Schedule of Infinite Lived Intangible Assets

Intangible assets, net consisted of the following as of December 31, 2020:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,111)	$	5,285	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquistion and other intangible assets	15,093		(9,044)		6,049
Voxbone acquistion:
Customer relationships	156,559		(1,739)		154,820		15
Developed technology	88,664		(1,478)		87,186		10
Total Voxbone acquisition	245,223		(3,217)		242,006
Total intangible assets, net	$	260,316	$	(12,261)	$	248,055

Intangible assets, net consisted of the following as of September 30, 2021:

	Gross Amount		Accumulated Amortization		Net Carrying Value		Amortization Period
Dash acquisition and other intangibles:							(Years)
Customer relationships	$	10,396	$	(5,501)	$	4,895	20
Other, definite lived	3,933		(3,933)		—		2 - 7
Licenses, indefinite lived	764		—		764		Indefinite
Total Dash acquisition and other intangible assets	15,093		(9,434)		5,659
Voxbone acquisition:
Customer relationships	147,874		(9,037)		138,837		15
Developed technology	83,746		(7,676)		76,070		10
Total Voxbone acquisition	231,620		(16,713)		214,907
Total intangible assets, net	$	246,713	$	(26,147)	$	220,566

Schedule of Amortization Expense

The Company recognized amortization expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	—	$	2,128	$	—	$	6,479
General and administrative	130		2,636		390		8,016
Total amortization expense	$	130	$	4,764	$	390	$	14,495

Schedule of Future Estimated Amortization Expense

Future estimated amortization expense for definite lived intangible assets is as follows:

	As of September 30,
	2021
2021 (remaining)	$	4,688
2022	18,753
2023	18,753
2024	18,753
2025	18,753
Thereafter	140,102
	$	219,802

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Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Net Carrying Amount of Liability and Equity Component of Notes

The net carrying amount of the liability components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Principal	$	400,000	$	400,000
Unamortized discount	(110,546)		(96,782)
Unamortized debt issuance costs	(7,258)		(6,354)
2026 Convertible Notes net carrying amount	282,196		296,864
2028 Convertible Notes:
Principal	—		250,000
Unamortized discount	—		(62,542)
Unamortized debt issuance costs	—		(5,167)
2028 Convertible Notes net carrying amount	—		182,291
Total net carrying amount	$	282,196	$	479,155

The net carrying amount of the equity components of the 2026 and 2028 Convertible Notes were as follows:

	As of December 31,		As of September 30,
	2020		2021
2026 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	$	125,152	$	125,152
Issuance costs	(3,742)		(3,742)
2026 Convertible Notes net carrying amount	121,410		121,410
2028 Convertible Notes:
Proceeds allocated to the conversion options (debt discount)	—		66,908
Issuance costs	—		(2,019)
2028 Convertible Notes net carrying amount	—		64,889
Total net carrying amount	$	121,410	$	186,299

Interest Income and Interest Expense Disclosure

The following table sets forth the interest expense recognized related to the 2026 and 2028 Convertible Notes:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
2026 Convertible Notes:
Contractual interest expense	$	246	$	250	$	591	$	750
Amortization of debt discount	4,292		4,664		10,183		13,761
Amortization of debt issuance costs	283		306		669		903
Total interest expense related to the 2026 Convertible Notes	4,821		5,220		11,443		15,414
2028 Convertible Notes:
Contractual interest expense	—		313		—		678
Amortization of debt discount	—		2,029		—		4,366
Amortization of debt issuance costs	—		168		—		362
Total interest expense related to the 2028 Convertible Notes	—		2,510		—		5,406
Total interest expense	$	4,821	$	7,730	$	11,443	$	20,820

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Segment and Geographic Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Segment Information

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
Revenue	$	73,762	$	107,376	$	199,959	$	312,561
Cost of revenue	39,346		54,841		108,467		164,616
Gross profit	$	34,416	$	52,535	$	91,492	$	147,945
Other
Revenue	$	10,996	$	23,262	$	30,107	$	52,214
Cost of revenue	6,181		17,554		15,428		35,166
Gross profit	$	4,815	$	5,708	$	14,679	$	17,048
Consolidated
Revenue	$	84,758	$	130,638	$	230,066	$	364,775
Cost of revenue	45,527		72,395		123,895		199,782
Gross profit	$	39,231	$	58,243	$	106,171	$	164,993

Schedule of Revenue by Geographical Area

The Company generates its revenue primarily in the United States. Revenue by geographic area is detailed in the table below (which is determined based on the customer billing address):

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
CPaaS
United States	$	71,809	$	94,135	$	194,414	$	275,986
International	1,953		13,241		5,545		36,575
Total	$	73,762	$	107,376	$	199,959	$	312,561
Other
United States	$	10,584	$	20,924	$	29,127	$	46,776
International	412		2,338		980		5,438
Total	$	10,996	$	23,262	$	30,107	$	52,214

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Reserved Shares of Common Stock for Issuance

The Company had reserved shares of Class A common stock for issuance under stock-based award agreements as follows:

	As of December 31,	As of September 30,
	2020	2021
Stock options issued and outstanding	255,000	183,271
Nonvested restricted stock units issued and outstanding	450,614	369,614
Stock-based awards available for grant under the 2017 Plan	2,020,342	3,048,353
	2,725,956	3,601,238

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Stock Based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Share-based Payment Arrangement [Abstract]

Summary of Stock Option Activity

The following summarizes the stock option activity for the periods presented:

	Number of options outstanding	Weighted- average exercise price (per share)		Weighted- average remaining contract life (in years)	Aggregate intrinsic value  (in thousands)
Outstanding as of December 31, 2020	255,000	$	10.82	4.42	$	36,426
Granted	—	—
Exercised	(70,923)	12.68			9,059
Forfeited or cancelled	(806)	10.49
Outstanding as of September 30, 2021	183,271	$	10.10	3.59	$	14,694
Options vested and exercisable at September 30, 2021	178,878	$	9.79	3.53	$	14,398
Options vested and expected to vest as of September 30, 2021	183,032	$	10.09	3.59	$	14,678

Summary of Restricted Stock Unit Activity

The following summarizes the RSU activity for the periods presented:

	Number of awards outstanding	Weighted-average grant date fair value (per share)
Nonvested RSUs as of December 31, 2020	450,614	$	51.58
Granted	146,989	146.80
Vested	(173,695)	62.13
Forfeited or cancelled	(54,294)	74.82
Nonvested RSUs as of September 30, 2021	369,614	$	84.11

Schedule of Stock-Based Compensation Expense

The Company recognized total stock-based compensation expense as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Cost of revenue	$	46	$	52	$	161	$	190
Research and development	508		621		1,581		2,055
Sales and marketing	369		519		1,140		1,591
General and administrative	1,459		2,633		4,424		7,756
Total	$	2,382	$	3,825	$	7,306	$	11,592

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Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2021

Retirement Benefits [Abstract]

Summary of Accumulated Benefit Obligation in Excess of Plan Assets

Pretax amounts for net periodic benefit cost and other amounts for the defined benefit pension plans consisted of the following components:

	Three months ended September 30,			Nine months ended September 30,
	2021			2021
Service cost	$	104		$	318
Interest cost	5			16
Return on plan assets	(4)			(11)
Net periodic pension cost	105			323
Total recognized in net periodic benefit cost	$	105		$	323
Defined benefit cost:
Expected long-term rate of return on plan assets	0.50		%	0.50		%

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Basic and Diluted Loss per Common Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The components of basic and diluted loss per share are as follows:

	Three months ended September 30,				Nine months ended September 30,
	2020		2021		2020		2021
Earnings per share
Net loss attributable to common stockholders	$	(2,352)	$	(6,944)	$	(24,051)	$	(19,188)
Net loss per share, basic and diluted	$	(0.10)	$	(0.28)	$	(1.01)	$	(0.77)
Weighted average number of common shares outstanding, basic and diluted	24,175,762		25,114,762		23,905,322		25,075,941

Schedule of Anti-dilutive Common Shares Excluded from Calculation of Net Loss

The following common share equivalents were excluded from the weighted average shares used to calculate net loss per common share because their effects would have been anti-dilutive:

	As of September 30,
	2020	2021
Stock options issued and outstanding	269,108	183,271
Restricted stock units issued and outstanding	447,449	369,614
Convertible senior notes (1)	708,073	1,316,199
Total	1,424,630	1,869,084

________________________

(1) As of September 30, 2020 and September 30, 2021, the Company used the treasury stock method to calculate the dilutive impact of the 2026 and 2028 Convertible Notes because at that time the Company expected to settle the principal amount of these notes in cash and any excess in shares of the Company's Class A common stock. As of September 30, 2020 and September 30, 2021, the conversion spread, calculated using the average market price of Class A common stock during the period consistent with the treasury stock method, had a dilutive impact for the 2026 Convertible Notes on diluted net income per share of Class A common stock when the average market price of the Company's Class A common stock for a given period exceeded the conversion price of $91.03 per share. As of September 30, 2021, the conversion spread for the 2028 Convertible Notes was anti-dilutive as the average market price of the Company's Class A common stock for a given period did not exceed the conversion price of $179.27 per share.

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Organization and Description of Business (Details) $ / shares in Units, € in Millions, $ in Millions			9 Months Ended
	Nov. 02, 2020 EUR (€)	Nov. 02, 2020 USD ($)	Sep. 30, 2021 segment	Mar. 16, 2021 $ / shares	Feb. 28, 2020 $ / shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of operating segments | segment			2
Number of reportable segments | segment			2
0.25% Convertible senior notes due 2026 | Convertible notes
Business Acquisition [Line Items]
Conversion price (in usd per share) | $ / shares					$ 91.03
0.50% Convertible senior notes due 2028 | Convertible notes
Business Acquisition [Line Items]
Conversion price (in usd per share) | $ / shares				$ 179.27
Voxbone S.A
Business Acquisition [Line Items]
Total purchase consideration | €	€ 446
Fair value of cash paid	338	$ 400
Voxbone S.A | Common stock
Business Acquisition [Line Items]
Fair value of Bandwidth common stock issued	€ 108	$ 128

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Summary of Significant Accounting Policies - Cash and Cash Equivalents and Accounts Receivable and Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Allowance for doubtful accounts	$ 1,467	$ 1,203
Unbilled accounts receivable	$ 32,665	$ 27,692

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Summary of Significant Accounting Policies - Accounts Receivable and Current Expected Credit Losses and Concentration of Credit Risk and Deferred Revenue and Customer Deposits (Details)	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Customer One | Customer | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage	12.00%	11.00%

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Business Combination (Details) $ in Thousands	3 Months Ended
	Sep. 30, 2021 USD ($)
Business Combination and Asset Acquisition [Abstract]
Goodwill measurement period adjustments	$ 1,609
Increase in accrued expenses and other current liabilities	$ 1,609

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Fair Value Measurements - Assets Measured at Fair Value (Details) - Fair value measurements on a recurring basis - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Money market account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	$ 302,291	$ 57,517
Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other investments		40,000
Financial assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	302,291	97,517
Level 1 | Money market account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	302,291	57,517
Level 1 | Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other investments		40,000
Level 1 | Financial assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	302,291	97,517
Level 2 | Money market account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Level 2 | Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other investments		0
Level 2 | Financial assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	0	0
Level 3 | Money market account
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	0	0
Level 3 | Time deposits
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total other investments		0
Level 3 | Financial assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total financial assets	$ 0	$ 0

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Fair Value Measurements - Additional Information (Details) - Convertible notes $ in Thousands	Sep. 30, 2021 USD ($)
0.25% Convertible senior notes due 2026
Debt Instrument [Line Items]
Fair value	$ 447,424
0.50% Convertible senior notes due 2028
Debt Instrument [Line Items]
Fair value	$ 214,766

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Financial Statement Components - Accounts Receivable, Net of Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Statement Components [Abstract]
Trade accounts receivable	$ 42,987	$ 26,504
Unbilled accounts receivable	32,665	27,692
Allowance for doubtful accounts and reserve for expected credit losses	(1,467)	(1,203)
Other accounts receivable	976	2,250
Total accounts receivable, net	$ 75,161	$ 55,243

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Financial Statement Components - Allowance For Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Allowance for Doubtful Accounts Receivable [Roll Forward]
Balance, beginning of period	$ (1,364)	$ (597)	$ (1,203)	$ (769)
Charged to bad debt expense	(169)	(312)	(475)	(492)
Deductions	54	20	182	372
Impact of foreign currency translation	12	0	29	0
Balance, end of period	$ (1,467)	$ (889)	$ (1,467)	$ (889)

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Financial Statement Components - Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Financial Statement Components [Abstract]
Accrued expense	$ 39,444	$ 31,549
Accrued compensation and benefits	17,341	19,534
Accrued sales, use, VAT and telecommunications related taxes	10,322	9,142
Current portion of finance lease	190	183
Obligation included in basis of acquired land	7,752	0
Other accrued expenses	1,210	2,657
Total accrued expenses and other current liabilities	$ 76,259	$ 63,065

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Right-of-Use Asset and Lease Liabilities - Additional Information (Details) $ in Thousands				3 Months Ended		9 Months Ended
	Jun. 05, 2021 USD ($) a	Jun. 04, 2021 USD ($) a	May 27, 2021 USD ($) ft² lease	Sep. 30, 2021 USD ($) lease ft²	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) lease ft²	Sep. 30, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Option to extend, term				5 years		5 years
Number of leases with early-termination option | lease				1		1
Short-term operating lease expense				$ 372	$ 0	$ 1,098	$ 0
Consideration for the proposed Land purchase						30,017	0
Proceeds from sale of land						$ 17,462	$ 0
Lease not yet commenced
Lessee, Lease, Description [Line Items]
Number of lease not yet commenced | lease						1
Lease term				20 years		20 years
Number of option to extend | lease			2			2
Term of option to extend			10 years			10 years
Total available extensions						20 years
Office space (in square foot) | ft²			534,000
Term of lease			20 years
Market rental rate			100.00%
Escrow to fund			$ 3,000
Lease not yet commenced | Developer
Lessee, Lease, Description [Line Items]
Security deposit			$ 2,500
Property
Lessee, Lease, Description [Line Items]
Land (acres) | a	17.06	40
Consideration for the proposed Land purchase		$ 30,017
Estimated cost of construction		$ 7,752
Lease incentive	$ 3,193
Property | Developer
Lessee, Lease, Description [Line Items]
Area of land sold | a	23.76
Proceeds from sale of land	$ 17,462
Minimum
Lessee, Lease, Description [Line Items]
Remaining lease term				9 months		9 months
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term				5 years 3 months		5 years 3 months
Relay, Inc
Lessee, Lease, Description [Line Items]
Sublease | ft²				17,073		17,073

XML

Right-of-Use Asset and Lease Liabilities - Future Minimum Sub-lease Receipts (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Leases [Abstract]
2021 (remaining)	$ 115
2022	249
Total	$ 364

XML

Right-of-Use Asset and Lease Liabilities - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 1,699	$ 1,461	$ 5,002	$ 4,383
Depreciation of assets	60	0	165	0
Interest on lease liabilities	5	0	14	0
Sublease income	(96)	(96)	(288)	(288)
Total net lease cost	$ 1,668	$ 1,365	$ 4,893	$ 4,095

XML

Right-of-Use Asset and Lease Liabilities - Supplemental Balance Sheet Lease Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Operating lease assets	$ 15,612	$ 19,491
Finance lease assets	408	464
Total leased assets	16,020	19,955
Current
Operating	6,015	5,515
Finance	190	183
Non-current
Long-term lease obligations	12,525	17,202
Long-term lease obligations	224	282
Total lease obligations	$ 18,954	$ 23,182
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued expenses and other current liabilities	Accrued expenses and other current liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List]	Other liabilities	Other liabilities
Accumulated amortization	$ 13,298	$ 9,083
Accumulated depreciation of assets under finance leases	$ 187	$ 28

XML

Right-of-Use Asset and Lease Liabilities - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Cash paid for amounts included in the measurement of lease liabilities
Operating cash flows from operating leases	$ 4,535	$ 3,944
Financing cash flows from finance leases	161	0
Lease liabilities	$ 4,696	$ 3,944
Weighted average remaining lease term (in years)
Operating leases	3 years 1 month 20 days	3 years 7 months 24 days
Finance leases	2 years 6 months 21 days		0 years
Weighted average discount rate
Operating leases	4.77%	4.99%
Finance leases	4.00%	0.00%

XML

Right-of-Use Asset and Lease Liabilities - Schedule of Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Operating Leases
2021 (remaining)	$ 1,362
2022	6,991
2023	6,615
2024	2,665
2025	1,640
Thereafter	709
Total lease payments	19,982
Less: imputed interest	(1,442)
Total lease obligations	18,540
Less: current obligations	(6,015)	$ (5,515)
Long-term lease obligations	12,525	17,202
Finance Leases
2021 (remaining)	59
2022	182
2023	109
2024	74
2025	11
Thereafter	0
Total lease payments	435
Less: imputed interest	(21)
Total lease obligations	414
Less: current obligations	(190)	(183)
Long-term lease obligations	$ 224	$ 282

XML

Property, Plant and Equipment - Summary of Property and Equipment, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Total cost	$ 126,843	$ 97,725
Less—accumulated depreciation	(58,576)	(46,080)
Property, plant and equipment, net	68,267	51,645
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Total cost	2,179	2,341
Computer and office equipment
Property, Plant and Equipment [Line Items]
Total cost	4,885	4,077
Telecommunications equipment
Property, Plant and Equipment [Line Items]
Total cost	68,596	60,651
Leasehold improvements
Property, Plant and Equipment [Line Items]
Total cost	6,260	6,285
Software
Property, Plant and Equipment [Line Items]
Total cost	4,994	3,901
Internal-use software development
Property, Plant and Equipment [Line Items]
Total cost	22,930	19,968
Automobile
Property, Plant and Equipment [Line Items]
Total cost	605	502
Land
Property, Plant and Equipment [Line Items]
Total cost	$ 16,394	$ 0

XML

Property, Plant and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Capitalized software development costs, additions	$ 808	$ 348	$ 3,212	$ 1,846
Amortization of capitalized software development costs	459	$ 377	1,404	$ 1,547
Capitalized implementation costs related to cloud computing arrangements	464		464
Cost of assets under finance leases	595		595
Accumulated depreciation of assets under finance leases	187		187		$ 28
Prepaid expenses and other current assets
Property, Plant and Equipment [Line Items]
Capitalized implementation costs related to cloud computing arrangements	140		140
Other long-term assets
Property, Plant and Equipment [Line Items]
Capitalized implementation costs related to cloud computing arrangements	$ 324		$ 324

XML

Property, Plant and Equipment - Depreciation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Depreciation Expense [Line Items]
Total depreciation expense	$ 4,469	$ 3,157	$ 12,983	$ 9,537
Cost of revenue
Depreciation Expense [Line Items]
Total depreciation expense	2,976	2,284	8,947	6,958
Research and development
Depreciation Expense [Line Items]
Total depreciation expense	296	197	829	441
Sales and marketing
Depreciation Expense [Line Items]
Total depreciation expense	32	30	90	90
General and administrative
Depreciation Expense [Line Items]
Total depreciation expense	$ 1,165	$ 646	$ 3,117	$ 2,048

XML

Intangible Assets - Summary of Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Dash acquisition and other intangibles:
Accumulated Amortization	$ (26,147)	$ (12,261)
Finite-lived intangible assets, net	219,802
Gross Amount	246,713	260,316
Net Carrying Value	220,566	248,055
Dash
Dash acquisition and other intangibles:
Accumulated Amortization	(9,434)	(9,044)
Gross Amount	15,093	15,093
Net Carrying Value	5,659	6,049
Dash | Licenses
Dash acquisition and other intangibles:
Licenses, indefinite lived	764	764
Dash | Customer relationships
Dash acquisition and other intangibles:
Finite-lived intangible assets, gross	10,396	10,396
Accumulated Amortization	(5,501)	(5,111)
Finite-lived intangible assets, net	$ 4,895	$ 5,285
Amortization Period	20 years	20 years
Dash | Other, definite lived
Dash acquisition and other intangibles:
Finite-lived intangible assets, gross	$ 3,933	$ 3,933
Accumulated Amortization	(3,933)	(3,933)
Finite-lived intangible assets, net	$ 0	$ 0
Dash | Other, definite lived | Minimum
Dash acquisition and other intangibles:
Amortization Period	2 years	2 years
Dash | Other, definite lived | Maximum
Dash acquisition and other intangibles:
Amortization Period	7 years	7 years
Voxbone S.A
Dash acquisition and other intangibles:
Accumulated Amortization	$ (16,713)	$ (3,217)
Gross Amount	231,620	245,223
Net Carrying Value	214,907	242,006
Voxbone S.A | Customer relationships
Dash acquisition and other intangibles:
Finite-lived intangible assets, gross	147,874	156,559
Accumulated Amortization	(9,037)	(1,739)
Finite-lived intangible assets, net	$ 138,837	$ 154,820
Amortization Period	15 years	15 years
Voxbone S.A | Developed technology
Dash acquisition and other intangibles:
Finite-lived intangible assets, gross	$ 83,746	$ 88,664
Accumulated Amortization	(7,676)	(1,478)
Finite-lived intangible assets, net	$ 76,070	$ 87,186
Amortization Period	10 years	10 years

XML

Intangible Assets - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]
Weighted average useful life	12 years 2 months 12 days

XML

Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Goodwill [Line Items]
Total amortization expense	$ 4,764	$ 130	$ 14,495	$ 390
Cost of revenue
Goodwill [Line Items]
Total amortization expense	2,128	0	6,479	0
General and administrative
Goodwill [Line Items]
Total amortization expense	$ 2,636	$ 130	$ 8,016	$ 390

XML

Intangible Assets - Future Estimated Amortization Expense (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
2021 (remaining)	$ 4,688
2022	18,753
2023	18,753
2024	18,753
2025	18,753
Thereafter	140,102
Finite-lived intangible assets, net	$ 219,802

XML

Debt - Revolving Loan (Details) - USD ($)	Sep. 30, 2021	May 25, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Outstanding unamortized loan fees			$ 83,000
Prepaid expenses and other current assets
Debt Instrument [Line Items]
Outstanding unamortized loan fees	$ 0		74,000
Other long-term assets
Debt Instrument [Line Items]
Outstanding unamortized loan fees			9,000
Credit Facility
Debt Instrument [Line Items]
Borrowing capacity		$ 25,000,000
Long-term debt			$ 0

XML

Debt - 2026 Convertible Notes (Details)	Feb. 28, 2020 USD ($) day $ / shares	Sep. 30, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items]
Total net proceeds	$ 344,722,000
Class A voting common stock
Debt Instrument [Line Items]
Common stock, par value (in usd per share) | $ / shares		$ 0.001	$ 0.001
2026 Convertible Notes
Debt Instrument [Line Items]
Cash redemption price, percent	100.00%
2026 Convertible Notes | Class A voting common stock
Debt Instrument [Line Items]
Common stock, par value (in usd per share) | $ / shares	$ 0.001
2026 Convertible Notes | Convertible notes
Debt Instrument [Line Items]
Principal	$ 400,000,000	$ 400,000,000	$ 400,000,000
Stated rate	0.25%
Conversion price (in usd per share) | $ / shares	$ 91.03
Conversion option	$ 125,160,000
Effective interest rate	6.763%
Carrying amount of equity component	$ 57,491,000
Annual effective interest rate	6.907%
Issuance costs attributable to the liability component	$ 8,217,000
Issuance costs	$ 3,742,000	$ 3,742,000	$ 3,742,000
2026 Convertible Notes | Convertible notes | Conversion option 2
Debt Instrument [Line Items]
Trading days | day	5,000
Consecutive trading days | day	10,000
2026 Convertible Notes | Convertible notes | Class A voting common stock
Debt Instrument [Line Items]
Conversion ratio	10.9857
2026 Convertible Notes | Convertible notes | Class A voting common stock | Conversion option 1
Debt Instrument [Line Items]
Stock price trigger percent	130.00%
Trading days | day	20
Consecutive trading days | day	30
2026 Convertible Notes | Convertible notes | Class A voting common stock | Conversion option 2
Debt Instrument [Line Items]
Stock price trigger percent	98.00%

XML

Debt - 2028 Convertible Notes (Details)	Mar. 16, 2021 USD ($) day $ / shares	Feb. 28, 2020 USD ($)	Sep. 30, 2021 USD ($) $ / shares	Dec. 31, 2020 USD ($) $ / shares
Debt Instrument [Line Items]
Total net proceeds		$ 344,722,000
Class A voting common stock
Debt Instrument [Line Items]
Common stock, par value (in usd per share) | $ / shares			$ 0.001	$ 0.001
2028 Convertible Notes | Class A voting common stock
Debt Instrument [Line Items]
Common stock, par value (in usd per share) | $ / shares	$ 0.001
2028 Convertible Notes | Convertible notes
Debt Instrument [Line Items]
Principal	$ 250,000,000		$ 250,000,000	$ 0
Stated rate	0.50%
Total net proceeds	$ 216,956,000
Conversion price (in usd per share) | $ / shares	$ 179.27
Cash redemption price, percent	100.00%
Conversion option	$ 66,908,000
Effective interest rate	5.125%
Carrying amount of equity component	$ 39,389,000
Annual effective interest rate	4.959%
Issuance costs attributable to the liability component	$ 5,525,000
Issuance costs	$ 2,019,000		$ 2,019,000	$ 0
2028 Convertible Notes | Convertible notes | Class A voting common stock
Debt Instrument [Line Items]
Conversion ratio	5.5781
2028 Convertible Notes | Convertible notes | Conversion option 1
Debt Instrument [Line Items]
Trading days | day	20
Consecutive trading days | day	30
2028 Convertible Notes | Convertible notes | Conversion option 1 | Class A voting common stock
Debt Instrument [Line Items]
Stock price trigger percent	130.00%
2028 Convertible Notes | Convertible notes | Conversion option 2
Debt Instrument [Line Items]
Trading days | day	5,000
Consecutive trading days | day	10,000
2028 Convertible Notes | Convertible notes | Conversion option 2 | Class A voting common stock
Debt Instrument [Line Items]
Stock price trigger percent	98.00%

XML

Debt - Schedule of Debt (Details) - Convertible notes - USD ($)	Sep. 30, 2021	Mar. 16, 2021	Dec. 31, 2020	Feb. 28, 2020
Debt Instrument [Line Items]
Total net carrying amount	$ 479,155,000		$ 282,196,000
Total net carrying amount	186,299,000		121,410,000
2026 Convertible Notes
Debt Instrument [Line Items]
Principal	400,000,000		400,000,000	$ 400,000,000
Unamortized discount	(96,782,000)		(110,546,000)
Unamortized debt issuance costs	(6,354,000)		(7,258,000)
Total net carrying amount	296,864,000		282,196,000
Proceeds allocated to the conversion options (debt discount)	125,152,000		125,152,000
Issuance costs	(3,742,000)		(3,742,000)	$ (3,742,000)
Total net carrying amount	121,410,000		121,410,000
2028 Convertible Notes
Debt Instrument [Line Items]
Principal	250,000,000	$ 250,000,000	0
Unamortized discount	(62,542,000)		0
Unamortized debt issuance costs	(5,167,000)		0
Total net carrying amount	182,291,000		0
Proceeds allocated to the conversion options (debt discount)	66,908,000		0
Issuance costs	(2,019,000)	$ (2,019,000)	0
Total net carrying amount	$ 64,889,000		$ 0

XML

Debt - Interest Income and Interest Expense Disclosure (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Total interest expense	$ 7,730	$ 4,821	$ 20,820	$ 11,443
2026 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	250	246	750	591
Amortization of debt discount	4,664	4,292	13,761	10,183
Amortization of debt issuance costs	306	283	903	669
Total interest expense	5,220	4,821	15,414	11,443
2028 Convertible Notes
Debt Instrument [Line Items]
Contractual interest expense	313	0	678	0
Amortization of debt discount	2,029	0	4,366	0
Amortization of debt issuance costs	168	0	362	0
Total interest expense	$ 2,510	$ 0	$ 5,406	$ 0

XML

Debt - Convertible Senior Notes and Capped Call Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	Mar. 16, 2021	Feb. 28, 2020
Debt Instrument [Line Items]
Net cost of capped call purchase	$ 25,500	$ 43,320
Class A voting common stock
Debt Instrument [Line Items]
Capped call shares (in shares)	1,394,525	4,394,276
Convertible notes | 0.25% Convertible senior notes due 2026
Debt Instrument [Line Items]
Initial conversion strike price (in usd per share)		$ 91.03
Initial cap price (in usd per share)		$ 137.40
Convertible notes | 0.50% Convertible senior notes due 2028
Debt Instrument [Line Items]
Initial conversion strike price (in usd per share)	$ 179.27
Initial cap price (in usd per share)	$ 260.76

XML

Segment and Geographic Information - Reconciliation of Segment Profit (Loss) (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) segment	Sep. 30, 2020 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment			2
Segment Reporting Information [Line Items]
Revenue	$ 130,638	$ 84,758	$ 364,775	$ 230,066
Cost of revenue	72,395	45,527	199,782	123,895
Gross profit	58,243	39,231	164,993	106,171
CPaaS
Segment Reporting Information [Line Items]
Revenue	107,376	73,762	312,561	199,959
Cost of revenue	54,841	39,346	164,616	108,467
Gross profit	52,535	34,416	147,945	91,492
Other
Segment Reporting Information [Line Items]
Revenue	23,262	10,996	52,214	30,107
Cost of revenue	17,554	6,181	35,166	15,428
Gross profit	$ 5,708	$ 4,815	$ 17,048	$ 14,679

XML

Segment and Geographic Information - Reconciliation of Revenue by Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	$ 1,100,926		$ 1,100,926		$ 890,608
Revenue	130,638	$ 84,758	364,775	$ 230,066
International
Revenues from External Customers and Long-Lived Assets [Line Items]
Assets	10,156		10,156		$ 11,249
CPaaS
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	107,376	73,762	312,561	199,959
CPaaS | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	94,135	71,809	275,986	194,414
CPaaS | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	13,241	1,953	36,575	5,545
Other
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	23,262	10,996	52,214	30,107
Other | United States
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	20,924	10,584	46,776	29,127
Other | International
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenue	$ 2,338	$ 412	$ 5,438	$ 980

XML

Stockholders' Equity - Preferred Stock (Details) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Equity [Abstract]
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, par value (in usd per share)	$ 0.001	$ 0.001
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0

XML

Stockholders' Equity - Common Stock (Details)	Sep. 30, 2021 vote $ / shares shares	Dec. 31, 2020 vote $ / shares shares
Class A voting common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Common stock voting rights | vote	1	1
Common stock, shares issued (in shares)	23,165,119	22,413,004
Common stock, shares outstanding (in shares)	23,165,119	22,413,004
Class B voting common stock
Class of Stock [Line Items]
Common stock, shares authorized (in shares)	20,000,000	20,000,000
Common stock, par value (in usd per share) | $ / shares	$ 0.001	$ 0.001
Common stock voting rights | vote	10	10
Common stock, shares issued (in shares)	1,965,170	2,496,125
Common stock, shares outstanding (in shares)	1,965,170	2,496,125

XML

Stockholders' Equity - Reserved Shares of Common Stock for Issuance (Details) - shares	Sep. 30, 2021	Dec. 31, 2020
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)	3,601,238	2,725,956
Stock options issued and outstanding
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)	183,271	255,000
Nonvested restricted stock units issued and outstanding
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)	369,614	450,614
Stock-based awards available for grant under the 2017 Plan
Class of Stock [Line Items]
Common stock reserved for future issuance (in shares)	3,048,353	2,020,342

XML

Stock Based Compensation - Additional Information (Details) - USD ($) $ in Thousands				3 Months Ended		9 Months Ended
	Jan. 01, 2021	Jan. 01, 2018	Nov. 09, 2017	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)				3,601,238		3,601,238		2,725,956
Estimated grant date fair value of options vested				$ 153	$ 193	$ 199	$ 322
Unrecognized cost for stock based compensation				$ 5		$ 5
Stock options issued and outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of options, granted (in shares)				0	0	0	0
Unrecognized cost for stock based compensation, period for recognition (in years)						1 month 2 days
Restricted stock units issued and outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)				369,614		369,614		450,614
Unrecognized cost for stock based compensation, period for recognition (in years)						2 years 10 months 9 days
Unrecognized compensation cost related to non-vested RSUs				$ 25,509		$ 25,509
2010 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares available for grant (in shares)				0		0
2017 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)			1,050,000
Common stock reserved for future issuance, percent increase		5.00%
Increase in shares available for grant (in shares)	1,120,650
2017 Plan | Stock options issued and outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
Contractual life (in years)			10 years
2017 Plan | Restricted stock units issued and outstanding
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Service period			4 years
2017 Plan | Restricted stock units issued and outstanding | Non-employee Board of Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
2017 Plan | Restricted stock units issued and outstanding | Executives
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)			4 years
2017 Plan | Restricted stock units issued and outstanding | Executives | Year one vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2017 Plan | Restricted stock units issued and outstanding | Executives | First quarter vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
2017 Plan | Restricted stock units issued and outstanding | Executives | Second quarter vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
2017 Plan | Restricted stock units issued and outstanding | Executives | Third quarter vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
2017 Plan | Restricted stock units issued and outstanding | Executives | First quarter vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			12.50%
2017 Plan | Restricted stock units issued and outstanding | Executives | Year two, three and four vesting
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%

XML

Stock Based Compensation - Stock Option Activity (Details) - Stock options issued and outstanding - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Number of options outstanding
Number of options outstanding, beginning balance (in shares)			255,000
Number of options, granted (in shares)	0	0	0	0
Number of options exercised (in shares)			(70,923)
Number of options, forfeited or cancelled (in shares)			(806)
Number of options outstanding, ending balance (in shares)	183,271		183,271		255,000
Options vested and exercisable (in shares)	178,878		178,878
Options vested and expected to vest (in shares)	183,032		183,032
Weighted- average exercise price (per share)
Weighted-average exercise price, beginning balance (in usd per share)			$ 10.82
Weighted-average exercise price, granted (in usd per share)			0
Weighted-average exercise price, exercised (in usd per share)			12.68
Weighted-average exercise price, forfeited or cancelled (in usd per share)			10.49
Weighted-average exercise price, ending balance (in usd per share)	$ 10.10		10.10		$ 10.82
Weighted-average exercise price, options vested and exercisable (in usd per share)	9.79		9.79
Weighted average exercise price, options vested and expected to vest (in usd per share)	$ 10.09		$ 10.09
Weighted- average remaining contract life (in years)
Weighted-average remaining contract life, options outstanding (in years)			3 years 7 months 2 days		4 years 5 months 1 day
Weighted-average remaining contract life, options vested and exercisable (in years)			3 years 6 months 10 days
Weighted average remaining contract life, options vested and expected to vest			3 years 7 months 2 days
Aggregate intrinsic value  (in thousands)
Aggregate intrinsic value, options outstanding	$ 14,694		$ 14,694		$ 36,426
Aggregate intrinsic value, options exercised			9,059
Aggregate intrinsic value, options vested and exercisable	14,398		14,398
Aggregate intrinsic value, options vested and expected to vest	$ 14,678		$ 14,678

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Stock Based Compensation - Restricted Stock Unit Activity (Details) - Restricted stock units issued and outstanding	9 Months Ended
	Sep. 30, 2021 $ / shares shares
Number of awards outstanding
Number of nonvested RSUs outstanding, beginning balance (in shares) | shares	450,614
Number of nonvested RSUs, granted (in shares) | shares	146,989
Number of nonvested RSUs, vested (in shares) | shares	(173,695)
Number of nonvested RSUs, forfeited or cancelled (in shares) | shares	(54,294)
Number of nonvested RSUs outstanding, ending balance (in shares) | shares	369,614
Weighted-average grant date fair value (per share)
Weighted-average grant date fair value, beginning balance (in usd per share) | $ / shares	$ 51.58
Weighted average grant-date fair value of nonvested RSUs, granted (in usd per share) | $ / shares	146.80
Weighted-average grant date fair value of nonvested RSUs, vested (in usd per share) | $ / shares	62.13
Weighted-average grant date fair value of nonvested restricted RSUs, forfeited or cancelled (in usd per share) | $ / shares	74.82
Weighted-average grant date fair value, ending balance (in usd per share) | $ / shares	$ 84.11

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Stock Based Compensation - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 3,825	$ 2,382	$ 11,592	$ 7,306
Cost of revenue
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	52	46	190	161
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	621	508	2,055	1,581
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	519	369	1,591	1,140
General and administrative
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Stock-based compensation expense	$ 2,633	$ 1,459	$ 7,756	$ 4,424

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Commitments and Contingencies - Additional Information (Details) $ in Thousands		9 Months Ended
	May 27, 2021 USD ($) lease	Sep. 30, 2021 USD ($) lease	Aug. 01, 2020 USD ($)
Lessee, Lease, Description [Line Items]
Annual minimum commitment, year one			$ 600
Annual minimum commitment, year two			$ 300
Non-cancellable purchase obligation		$ 17,287
Non-cancellable purchase obligation, fulfilled within a year		11,824
Lease payments of initial term		$ 19,982
Project
Lessee, Lease, Description [Line Items]
Commencement date, rent abatement period	120 days
Commencement delivered period	12 months
Number of option to extend | lease	2	2
Term of option to extend	10 years	10 years
Base rent percentage	1.85%
Lease payments of initial term	$ 496,000
Maximum
Lessee, Lease, Description [Line Items]
Remaining lease term		5 years 3 months

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Employee Benefit Plans - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Matching contributions	$ 811,000	$ 474,000	$ 2,565,000	$ 1,583,000
Non-U.S. | Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Net periodic pension cost	$ 105,000	$ 0	$ 323,000	$ 0

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Employee Benefit Plans - Summary of Net Periodic Cost of Pension and Postretirement Benefit Plans (Details) - Pension Plan - Non-U.S. - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Defined Benefit Plan Disclosure [Line Items]
Service cost	$ 104,000		$ 318,000
Interest cost	5,000		16,000
Return on plan assets	(4,000)		(11,000)
Net periodic pension cost	105,000	$ 0	323,000	$ 0
Total recognized in net periodic benefit cost	$ 105,000		$ 323,000
Expected long-term rate of return on plan assets	0.50%		0.50%

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Income Taxes - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective tax rate	(4.80%)	(0.40%)	(1.30%)	(134.20%)

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Related Parties (Details) - Affiliated Entity - Relay - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Related Party Transaction [Line Items]
Amount collected on behalf	$ 16,000	$ 747,000	$ 360,000	$ 1,295,000
Payable	0		0		$ 16,000
Facilities Sharing Agreement
Related Party Transaction [Line Items]
Reduction of rent expense	96,000	96,000	288,000	288,000
Due from related parties	0		0		0
Master Services Agreement
Related Party Transaction [Line Items]
Revenue from related parties	425,000	541,000	1,374,000	1,657,000
Accounts receivable, related parties	142,000		142,000		170,000
Legal services
Related Party Transaction [Line Items]
Revenue from related parties	6,000	$ 16,000	19,000	$ 63,000
Accounts receivable, related parties	$ 2,000		$ 2,000		$ 2,000

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Basic and Diluted Loss per Common Share - Components of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net loss attributable to common stockholders	$ (6,944)	$ (2,352)	$ (19,188)	$ (24,051)
Net loss per share, basic (in usd per share)	$ (0.28)	$ (0.10)	$ (0.77)	$ (1.01)
Net loss per share, diluted (in usd per share)	$ (0.28)	$ (0.10)	$ (0.77)	$ (1.01)
Weighted average number of common shares outstanding, basic (in shares)	25,114,762	24,175,762	25,075,941	23,905,322
Weighted average number of common shares outstanding, diluted (in shares)	25,114,762	24,175,762	25,075,941	23,905,322

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Basic and Diluted Loss per Common Share - Schedule of Antidilutive Common Share Equivalents Excluded from Earnings Per Share (Details) - $ / shares	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Mar. 16, 2021	Feb. 28, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,869,084	1,424,630
0.25% Convertible senior notes due 2026 | Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in usd per share)				$ 91.03
0.50% Convertible senior notes due 2028 | Convertible notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion price (in usd per share)			$ 179.27
Stock options issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	183,271	269,108
Restricted stock units issued and outstanding
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	369,614	447,449
Convertible senior notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	1,316,199	708,073