10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

(Mark One)

☒ 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: 001-38324

Casa Systems, Inc.

(Exact name of registrant as specified in its charter)

Delaware	75-3108867
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
100 Old River Road Andover, Massachusetts	01810
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (978) 688-6706

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol	Name of each exchange on which registered
Common Stock, $0.001 par value per share	CASA	The Nasdaq Stock Market LLC

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  ☒    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  ☒    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 26, 2021, the registrant had 86,006,357 shares of common stock, $0.001 par value per share, outstanding.

Table of Contents

		Page
PART I.	FINANCIAL INFORMATION	3
Item 1.	Financial Statements	3
	Condensed Consolidated Financial Statements (Unaudited)	3
	Condensed Consolidated Balance Sheets as of September 30, 2021 and December 31, 2020	3
	Condensed Consolidated Statements of Operations and Comprehensive (Loss) Income for the Three and Nine months ended September 30, 2021 and 2020	4
	Condensed Consolidated Statements of Stockholders' Equity for the Three and Nine months ended September 30, 2021 and 2020	5
	Condensed Consolidated Statements of Cash Flows for the Nine months ended September 30, 2021 and 2020	7
	Notes to Unaudited Condensed Consolidated Financial Statements	8
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	27
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	38
Item 4.	Controls and Procedures	40
PART II.	OTHER INFORMATION	41
Item 1.	Legal Proceedings	41
Item 1A.	Risk Factors	42
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	43
Item 6.	Exhibits	44
Signatures		45

i

Cautionary 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, and Section 21E of the Securities Exchange Act of 1934, as amended. All statements other than statements of historical fact contained in this Quarterly Report on Form 10-Q, including statements regarding our future results of operations and financial position, business strategy and plans and objectives of management for future operations, are forward-looking statements. These statements involve known and unknown risks, uncertainties and other important factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by the forward-looking statements.

In some cases, you can identify forward-looking statements by terms such as “may,” “might,” “should,” “expects,” “plans,” “anticipates,” “would,” “could,” “intends,” “target,” “projects,” “contemplates,” “believes,” “estimates,” “predicts,” “potential” or “continue” or the negative of these terms or other similar expressions. The forward-looking statements in this Quarterly Report on Form 10-Q are only predictions. We have based these forward-looking statements largely on our current expectations and projections about future events and financial trends that we believe may affect our business, financial condition and results of operations. These forward-looking statements speak only as of the date of this Quarterly Report on Form 10-Q and are subject to a number of risks, uncertainties and assumptions described in the “Risk Factors” section and elsewhere in this Quarterly Report on Form 10-Q. Because forward-looking statements are inherently subject to risks and uncertainties, some of which cannot be predicted or quantified, you should not rely on these forward-looking statements as predictions of future events. The events and circumstances reflected in our forward-looking statements may not be achieved or occur and actual results could differ materially from those projected in the forward-looking statements. Some of the key factors that could cause actual results to differ from our expectations include:

• our inability to fulfill our customers’ orders due to supply chain delays, access to key commodities or technologies or events that impact our manufacturers or their suppliers;

• our ability to anticipate technological shifts;

• our ability to generate positive returns on our research and development;

• changes in the rate of communication service providers’, or CSPs’, deployment of, and investment in, ultra-broadband network capabilities;

• the lack of predictability of revenue due to lengthy sales cycles and the volatility in capital expenditure budgets of CSPs;

• our ability to maintain and expand gross profit and net income;

• the sufficiency of our cash resources and needs for additional financing;

• our ability to further penetrate our existing customer base and obtain new customers;

• changes in our pricing policies, whether initiated by us or as a result of competition;

• the amount and timing of operating costs and capital expenditures related to the operation and expansion of our business;

• the potential impact of the COVID-19 pandemic, which is highly uncertain and will depend on future developments on our business, our suppliers and our customers;

• the actual or rumored timing and success of new product and service introductions by us or our competitors or any other change in the competitive landscape of our industry, including consolidation among our competitors or customers;

• our ability to successfully expand our business domestically and internationally, including our ability to maintain the synergies we have realized from our acquisition of NetComm Wireless Limited, or NetComm;

• insolvency or credit difficulties confronting our customers, which could adversely affect their ability to purchase or pay for our products and services, or confronting our key suppliers, which could disrupt our supply chain;

• future accounting pronouncements or changes in our accounting policies;

• stock-based compensation expense;

1

• our overall effective tax rate, including impacts caused by the relative proportion of foreign to U.S. income, the amount and timing of certain employee stock-based compensation transactions, changes in the valuation of our deferred tax assets and any new legislation or regulatory developments;

• increases or decreases in our expenses caused by fluctuations in foreign currency exchange rates;

• the costs and possible outcomes of any legal actions or proceedings against us, including those described under “Part II, Item 1—Legal Proceedings”;

• general economic conditions, both domestically and in foreign markets;

• our ability to obtain and maintain intellectual property protection for our products; and

• our use of proceeds from our initial public offering.

Except as required by applicable law, we do not plan to publicly update or revise any forward-looking statements contained herein, whether as a result of any new information, future events or otherwise.

2

PART I—FINANCIAL INFORMATION

Item 1. Financial Statements

CASA SYSTEMS, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(in thousands, except per share amounts)

(Unaudited)

	September 30,			December 31,
	2021			2020
Assets
Current assets:
Cash and cash equivalents	$	156,460		$	157,455
Accounts receivable, net of provision for doubtful accounts of $121 and $58 as of    September 30, 2021 and December 31, 2020, respectively		80,863			94,124
Inventory		91,853			101,204
Prepaid expenses and other current assets		4,485			3,864
Prepaid income taxes		19,956			14,087
Total current assets		353,617			370,734
Property and equipment, net		24,647			28,880
Accounts receivable, net of current portion		—			143
Deferred tax assets		1,704			1,150
Goodwill		50,177			50,177
Intangible assets, net		32,661			35,844
Other assets		7,435			6,038
Total assets	$	470,241		$	492,966
Liabilities and Stockholders’ Equity
Current liabilities:
Accounts payable	$	22,841		$	41,203
Accrued expenses and other current liabilities		33,368			39,793
Accrued income taxes		4,020			7,463
Deferred revenue		15,857			15,531
Current portion of long-term debt, net of unamortized debt issuance costs		8,421			15,171
Total current liabilities		84,507			119,161
Accrued income taxes, net of current portion		11,359			9,520
Deferred tax liabilities		6,504			7,282
Deferred revenue, net of current portion		5,072			3,520
Long-term debt, net of current portion and unamortized debt issuance costs		274,672			276,085
Other liabilities, net of current portion		1,582			1,024
Total liabilities		383,696			416,592
Commitments and contingencies (Note 17)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized as of September 30, 2021    and December 31, 2020; no shares issued and outstanding as of    September 30, 2021 and December 31, 2020		—			—
Common stock, $0.001 par value; 500,000 shares authorized; 87,678 and 85,329 shares   issued as of September 30, 2021 and December 31, 2020, respectively; 85,956 and   83,607 shares outstanding as of September 30, 2021 and December 31, 2020,   respectively		88			85
Treasury stock, at cost; 1,722 shares		(4,826	)		(4,826	)
Additional paid-in capital		191,399			183,041
Accumulated other comprehensive income		467			337
Accumulated deficit		(100,583	)		(102,263	)
Total stockholders’ equity		86,545			76,374
Total liabilities and stockholders’ equity	$	470,241		$	492,966

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

3

CASA SYSTEMS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME

(in thousands, except per share amounts)

(Unaudited)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Revenue:
Product	$	87,752		$	93,741		$	262,019		$	239,627
Service		11,467			12,006			34,207			33,093
Total revenue		99,219			105,747			296,226			272,720
Cost of revenue:
Product		57,372			51,947			150,515			130,602
Service		1,223			1,206			3,532			3,741
Total cost of revenue		58,595			53,153			154,047			134,343
Gross profit		40,624			52,594			142,179			138,377
Operating expenses:
Research and development		21,578			21,823			63,479			63,722
Selling, general and administrative		21,029			21,630			64,492			67,731
Total operating expenses		42,607			43,453			127,971			131,453
(Loss) income from operations		(1,983	)		9,141			14,208			6,924
Other income (expense):
Interest income		80			170			297			847
Interest expense		(3,969	)		(3,771	)		(11,886	)		(12,706	)
(Loss) gain on foreign currency, net		(375	)		(6	)		(1,353	)		674
Other income, net		83			338			634			435
Total other income (expense), net		(4,181	)		(3,269	)		(12,308	)		(10,750	)
(Loss) income before (benefit from) provision for income taxes		(6,164	)		5,872			1,900			(3,826	)
(Benefit from) provision for income taxes		(5,288	)		2,399			220			(5,433	)
Net (loss) income		(876	)		3,473			1,680			1,607
Other comprehensive (loss) income—foreign currency translation    adjustment, net of tax		(127	)		1,334			130			916
Other comprehensive loss—gain on foreign currency hedge    net of tax		—			(527	)		—			—
Comprehensive (loss) income	$	(1,003	)	$	4,280		$	1,810		$	2,523
Net (loss) income per share attributable to common stockholders:
Basic	$	(0.01	)	$	0.04		$	0.02		$	0.02
Diluted	$	(0.01	)	$	0.04		$	0.02		$	0.02
Weighted-average shares used to compute net (loss) income per    share attributable to common stockholders:
Basic		85,660			83,302			84,985			83,437
Diluted		85,660			85,466			88,948			85,370

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

4

CASA SYSTEMS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(in thousands)

(Unaudited)

	Common Stock				Treasury Stock					Additional Paid-in		Accumulated Other Comprehensive			Accumulated			Total Stockholders’
	Shares		Amount		Shares		Amount			Capital		Income			Deficit			Equity
Balances at June 30, 2021		87,116	$	87		1,722	$	(4,826	)	$	185,809	$	594		$	(99,707	)	$	81,957
Exercise of stock options and common stock    issued upon vesting of equity awards, net    of shares withheld for employee taxes		562		1		—		—			1,704		—			—			1,705
Foreign currency translation adjustment		—		—		—		—			—		(127	)		—			(127	)
Stock-based compensation		—		—		—		—			3,886		—			—			3,886
Net loss		—		—		—		—			—		—			(876	)		(876	)
Balances at September 30, 2021		87,678	$	88		1,722	$	(4,826	)	$	191,399	$	467		$	(100,583	)	$	86,545

	Common Stock				Treasury Stock					Additional Paid-in			Accumulated Other Comprehensive		Accumulated			Total Stockholders’
	Shares		Amount		Shares		Amount			Capital			Income		Deficit			Equity
Balances at January 1, 2021		85,329	$	85		1,722	$	(4,826	)	$	183,041		$	337	$	(102,263	)	$	76,374
Exercise of stock options and common stock    issued upon vesting of equity awards, net    of shares withheld for employee taxes		2,349		3		—		—			(2,787	)		—		—			(2,784	)
Foreign currency translation adjustment		—		—		—		—			—			130		—			130
Stock-based compensation		—		—		—		—			11,145			—		—			11,145
Net income		—		—		—		—			—			—		1,680			1,680
Balances at September 30, 2021		87,678	$	88		1,722	$	(4,826	)	$	191,399		$	467	$	(100,583	)	$	86,545

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

5

CASA SYSTEMS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (continued)

(in thousands)

(Unaudited)

	Common Stock				Treasury Stock					Additional Paid-in		Accumulated Other Comprehensive			Accumulated			Total Stockholders’
	Shares		Amount		Shares		Amount			Capital		Loss			Deficit			Equity
Balances at June 30, 2020		84,856	$	85		1,722	$	(4,826	)	$	175,496	$	(2,113	)	$	(128,930	)	$	39,712
Exercise of stock options and common    stock issued upon vesting of equity    awards, net of shares withheld for    employee taxes		389		—		—		—			390		—			—			390
Cash flow hedges		—		—		—		—			—		(527	)		—			(527	)
Foreign currency translation adjustment		—		—		—		—			—		1,334			—			1,334
Stock-based compensation		—		—		—		—			3,496		—			—			3,496
Net income		—		—		—		—			—		—			3,473			3,473
Balances at September 30, 2020		85,245	$	85		1,722	$	(4,826	)	$	179,382	$	(1,306	)	$	(125,457	)	$	47,878

	Common Stock				Treasury Stock					Additional Paid-in		Accumulated Other Comprehensive			Accumulated			Total Stockholders’
	Shares		Amount		Shares		Amount			Capital		Loss			Deficit			Equity
Balances at January 1, 2020		84,333	$	84		495	$	(1,795	)	$	169,561	$	(2,222	)	$	(127,064	)	$	38,564
Exercise of stock options and common    stock issued upon vesting of equity    awards, net of shares withheld for    employee taxes		912		1		—		—			316		—			—			317
Foreign currency translation adjustment		—		—		—		—			—		916			—			916
Repurchases of treasury shares		—		—		1,227		(3,031	)		—		—			—			(3,031	)
Stock-based compensation		—		—		—		—			9,505		—			—			9,505
Net income		—		—		—		—			—		—			1,607			1,607
Balances at September 30, 2020		85,245	$	85		1,722	$	(4,826	)	$	179,382	$	(1,306	)	$	(125,457	)	$	47,878

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

6

CASA SYSTEMS, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(in thousands)

(Unaudited)

	Nine Months Ended September 30,
	2021			2020
Cash flows provided by operating activities:
Net income	$	1,680		$	1,607
Adjustments to reconcile net income to net cash provided by    operating activities:
Depreciation and amortization		11,986			13,660
Stock-based compensation		11,245			9,498
Deferred income taxes		(1,322	)		(1,834	)
Increase in provision for doubtful accounts		63			18
Change in provision for excess and obsolete inventory		(98	)		1,290
Gain on disposal of assets		29			11
Changes in operating assets and liabilities:
Accounts receivable		13,194			27,537
Inventory		9,302			(6,617	)
Prepaid expenses and other assets		(1,648	)		3,004
Prepaid income taxes		(5,873	)		(9,763	)
Accounts payable		(17,553	)		13,764
Accrued expenses and other current liabilities		(6,074	)		973
Accrued income taxes		(1,601	)		2,467
Deferred revenue		1,867			(3,971	)
Net cash provided by operating activities		15,197			51,644
Cash flows used in investing activities:
Purchases of property and equipment		(2,979	)		(4,102	)
Purchases of software licenses		(1,425	)		—
Net cash used in investing activities		(4,404	)		(4,102	)
Cash flows used in financing activities:
Principal repayments of debt		(9,025	)		(8,893	)
Borrowings on revolving credit facility		—			6,500
Proceeds from exercise of stock options		3,532			957
Employee taxes paid related to net share settlement of equity awards		(6,315	)		(639	)
Payments of dividends and equitable adjustments		(97	)		(661	)
Repurchases of treasury stock		—			(3,031	)
Net cash used in financing activities		(11,905	)		(5,767	)
Effect of exchange rate changes on cash and cash equivalents		111			763
Net (decrease) increase in cash, cash equivalents and restricted cash		(1,001	)		42,538
Cash, cash equivalents and restricted cash at beginning of period		158,461			114,657
Cash, cash equivalents and restricted cash at end of period (1)	$	157,460		$	157,195
Supplemental disclosures of cash flow information:
Cash paid for interest	$	12,167		$	9,226
Cash paid for income taxes	$	8,288		$	2,306
Supplemental disclosures of non-cash operating, investing    and financing activities:
Purchases of property and equipment included in accounts payable	$	179		$	673
Unpaid equitable adjustments included in accrued expenses and other current liabilities	$	1		$	85

(1) See Note 2 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash shown in these unaudited condensed consolidated statements of cash flows.

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

7

CASA SYSTEMS, INC.

NOTES TO UNAUDITED CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(in thousands, except per share amounts)

(Unaudited)

1. Nature of Business and Basis of Presentation

Casa Systems, Inc. (the “Company”) was incorporated under the laws of the State of Delaware on February 28, 2003. The Company is a global communications technology company headquartered in Andover, Massachusetts and has wholly owned subsidiaries in China, France, Canada, Ireland, Spain, Colombia, the Netherlands, Hong Kong, Australia, Germany, the United Kingdom and New Zealand.

The Company offers physical, virtual and cloud-native 5G broadband and customer premise networking equipment for public and private high-speed data and multi-service communications networks. The Company’s core and edge broadband technology enables communications service providers and enterprises to cost-effectively and dynamically increase data network speed, add bandwidth capacity and new services, reduce network complexity, and reduce operating and capital expenditures.  

The Company is subject to a number of risks similar to other companies of comparable size and other companies selling and providing services to the communications service provider (“CSP”) industry. These risks include, but are not limited to, the level of capital spending by the CSPs, a lengthy sales cycle, dependence on the development of new products and services, unfavorable economic and market conditions, competition from larger and more established companies, limited management resources, dependence on a limited number of contract manufacturers and suppliers, the rapidly changing nature of the technology used by the CSPs and reliance on resellers and sales agents. Failure by the Company to anticipate or to respond adequately to technological developments in its industry, changes in customer or supplier requirements, changes in regulatory requirements or industry standards, or any significant delays in the development or introduction of products could have a material adverse effect on the Company’s operating results, financial condition and cash flows.

The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the Company’s initial public offering, subject to specified conditions.  The JOBS Act provides that an emerging growth company can take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. The Company has elected not to “opt out” of such extended transition period, which means that when a standard is issued or revised, and it has different application dates for public or private companies, the Company is required to adopt the new or revised standard at or prior to the time private companies are required to adopt the new or revised standard, provided that the Company continues to be an emerging growth company. The JOBS Act provides that the decision to take advantage of the extended transition period for complying with new or revised accounting standards is irrevocable.

The accompanying condensed consolidated balance sheet as of September 30, 2021, the condensed consolidated statements of operations and comprehensive (loss) income for the three and nine months ended September 30, 2021 and 2020, the condensed consolidated statements of cash flows for the nine months ended September 30, 2021 and 2020 and the condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2021 and 2020 are unaudited. The financial data and other information disclosed in these notes related to the three and nine months ended September 30, 2021 and 2020 are also unaudited. The accompanying condensed consolidated balance sheet as of December 31, 2020 was derived from the Company’s audited consolidated financial statements for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 25, 2021 (the “Annual Report on Form 10-K”). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K. There have been no changes to the Company’s accounting policies from those disclosed in the Annual Report on Form 10-K that would have a material impact on the Company’s condensed consolidated financial statements.

The unaudited interim condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and, in the opinion of management, include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods, but are not necessarily indicative of the results of operations and cash flows to be anticipated for the full year ending December 31, 2021 or any future period.

8

The accompanying condensed consolidated financial statements include the accounts and results of operations of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

2. Summary of Significant Accounting Policies

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods.

Significant estimates and judgments relied upon by management in preparing these condensed consolidated financial statements include revenue recognition, provision for doubtful accounts, reserves for excess and obsolete inventory, valuation of inventory and deferred inventory costs, the expensing and capitalization of software-related research and development costs, amortization and depreciation periods, the recoverability of net deferred tax assets, valuations of uncertain tax positions, warranty allowances, the valuation of equity instruments and stock-based compensation expense.

Although the Company regularly reassesses the assumptions underlying these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances existing at the time such estimates are made.

The COVID-19 pandemic presents various risks to the Company, not all of which the Company is able to fully evaluate or even to foresee at the current time, and which could have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While the Company remains fully operational, during the three and nine months ended September 30, 2021, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on the Company’s financial results. In particular, certain of the Company’s products utilize components, for which there has been increased global demand.  As a result, throughout 2021, and increasingly during the three months ended September 30, 2021, the Company began to see shortages of supply that resulted in the Company’s inability to fulfill certain customer orders within normal lead times.  This adversely impacted the Company’s revenue and operating results for the three and nine months ended September 30, 2021. While the Company continues to work with its supply chain, contract manufacturers, and customers to minimize the extent of such impacts, the Company expects the effects of global supply chain issues to continue and cannot predict when such effects will subside.  This may prevent the Company from being able to fulfill its customers’ orders in a timely manner or at all, which could lead to one or more of its customers cancelling their orders.  At this time the Company is neither able to estimate the extent of these impacts nor predict whether its efforts to minimize or contain them will be successful. The Company intends to continue to monitor its business very closely for any effects of COVID-19 for as long as necessary.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents include all highly liquid investments maturing within three months from the date of purchase. As of September 30, 2021 and December 31, 2020, the Company’s cash and cash equivalents consisted of investments in certificates of deposit and money market mutual funds.

Restricted cash as of September 30, 2021 and December 31, 2020 consisted of a certificate of deposit of $1,000 and $1,006, respectively, pledged as collateral for a stand-by letter of credit required to support a contractual obligation.

The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows:

	September 30, 2021		September 30, 2020
Cash and cash equivalents	$	156,460	$	156,191
Restricted cash included in other assets		1,000		1,004
	$	157,460	$	157,195

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Accounts Receivable

Accounts receivable are presented net of a provision for doubtful accounts, which is an estimate of amounts that may not be collectible. Accounts receivable for customer contracts with customary payment terms, which are one year or less, are recorded at invoiced amounts and do not bear interest. The Company may, in limited circumstances, grant payment terms longer than one year.  Payments due beyond 12 months from the balance sheet date are recorded as non-current assets. The Company generally does not require collateral, but the Company may, in certain instances based on its credit assessment, require full or partial prepayment prior to shipment.    

Accounts receivable as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Current portion of accounts receivable, net:
Accounts receivable, net	$	80,719	$	93,480
Accounts receivable, extended payment terms		144		644
		80,863		94,124
Accounts receivable, net of current portion:
Accounts receivable, extended payment terms		—		143
	$	80,863	$	94,267

The Company performs ongoing credit evaluations of its customers and, if necessary, provides a provision for doubtful accounts and expected losses. When assessing and recording its provision for doubtful accounts, the Company evaluates the age of its accounts receivable, current economic trends, creditworthiness of the customer, customer payment history, and other specific customer and transaction information. The Company writes off accounts receivable against the provision when it determines a balance is uncollectible and no longer actively pursues collection of the receivable. Adjustments to the provision for doubtful accounts are recorded as selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income.

As of September 30, 2021 and December 31, 2020, the Company concluded that all amounts due under extended payment terms were collectible and no reserve for credit losses was recorded. During the nine months ended September 30, 2021 and 2020, the Company did not provide a reserve for credit losses and did not write off any uncollectible receivables due under extended payment terms.

Concentration of Risks

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents consist of demand deposits, savings accounts, money market mutual funds, and certificates of deposit with financial institutions, which may exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses related to its cash and cash equivalents and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables:

	Revenue						Revenue
	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Customer A		24	%		13	%		20	%	*
Customer B	*				27	%	*				23	%
Customer C	*			*				11	%	*

	Accounts Receivable, Net
	September 30, 2021			December 31, 2020
Customer A		21	%	*
Customer D	*				17	%

* Less than 10% of total

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Certain of the components and subassemblies included in the Company’s products are obtained from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those single or limited source suppliers, the partial or complete loss of certain of these sources could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships.

Stock-Based Compensation

The Company measures stock options and other stock-based awards granted to employees and directors based on the fair value on the date of grant and recognizes compensation expense of those awards, net of estimated forfeitures, over the requisite service period, which is generally the vesting period of the respective award. Generally, the Company issues stock options with only service-based vesting conditions and records the expense for these awards using the straight-line method.

The Company classifies stock-based compensation expense in its consolidated statements of operations and comprehensive (loss) income in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Company recognizes compensation expense for only the portion of awards that are expected to vest. In developing a forfeiture rate estimate, the Company has considered its historical experience to estimate pre-vesting forfeitures for service-based awards. The impact of a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual forfeiture rate is materially different from the Company’s estimate, the Company may be required to record adjustments to stock-based compensation expense in future periods.

The Company estimates the fair value of each stock option grant on the date of grant using the Black-Scholes option pricing model. The Company was a private company until December 14, 2017 and lacks sufficient company-specific historical and implied volatility information for its stock. Therefore, for all options granted in 2020 or before, the Company estimated its expected stock volatility based on the historical volatility of publicly traded peer companies. Beginning with options granted in 2021, the Company estimates its expected stock volatility using a weighted-average calculation based on the historical volatility of the Company and publicly traded peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded stock price. The expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-employees is equal to the contractual term of the option award. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company does not have a history of declaring or paying cash dividends, except for the special cash dividends declared in November 2014, June 2016, December 2016, May 2017 and November 2017, and in those circumstances the board of directors approved cash dividends to be paid to holders of the Company’s stock options, stock appreciation rights (“SARs”) and restricted stock units (“RSUs”) upon vesting as an equitable adjustment to the holders of such instruments.

The Company has also granted SARs to certain employees, which require the Company to pay in cash upon exercise an amount equal to the product of the excess of the per share fair market value of the Company’s common stock on the date of exercise over the exercise price, multiplied by the number of shares of common stock with respect to which the SAR is exercised. Because these awards may require the Company to settle the awards in cash, the Company accounts for them as a liability in the Company’s consolidated balance sheets. The Company recognizes the liability related to these awards, as well as related compensation expense over the period during which services are rendered until completed. As all SARs are now fully vested, the Company continues to remeasure the fair market value of the liability until the award is either exercised or canceled, with changes in the fair value of the liability recorded in the consolidated statements of operations and comprehensive (loss) income.

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Impact of Recently Adopted Accounting Standards

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):  Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.  This guidance simplifies the guidance on certain financial instruments with characteristics of liability and equity, including convertible debt instruments.  As a result, entities will not separately present in equity an embedded conversion feature in such debt and will account for a convertible debt instrument wholly as debt, unless certain other conditions are met.  The elimination of these models will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that is within the scope of ASU 2020-06.  The ASU also simplifies the diluted earnings per share calculation in certain areas. The guidance will become effective for fiscal years beginning after December 15, 2021, with early adoption permitted no earlier than fiscal years beginning after December 15, 2020.  The Company has elected to early adopt this ASU and the adoption did not have a material impact on the Company’s condensed consolidated financial statements and the accompanying notes thereto.

Impact of Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842): Amendments to FASB Accounting Standards Codification (“ASU 2016-02”), which replaces the existing guidance for leases.  ASU 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees.  In general, for lease arrangements exceeding a twelve-month term, the arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee.  Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases.  The balance sheet amount recorded for existing leases at the date of adoption of ASU 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption.  This guidance will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for annual reporting periods beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. The Company has begun planning for adoption by implementing a new lease accounting software and by working to establish additional changes to internal processes to comply with all requirements upon adoption.  The standard allows for, and the Company plans on using, a modified retrospective approach with comparatives under ASC 840, where entities would recognize a cumulative effect to retained earnings at the date of adoption without restating prior period balances or disclosure.  Management is continuing to assess the impact of ASU 2016-02 on the Company’s condensed consolidated financial statements and the accompanying notes thereto.  

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). This guidance is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The main provisions include presenting financial assets measured at amortized cost at the amount expected to be collected, which is net of an allowance for expected credit losses, and recording credit losses related to available-for-sale securities through an allowance for credit losses. The effective dates for the amendments in ASU 2016-13 were updated in ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and as such ASU 2016-13 will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for fiscal years beginning after December 15, 2022, including interim periods within those fiscal periods, and must be applied using a modified retrospective approach. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements.

Other

Other than the disclosures above, there have been no changes to the significant accounting policies disclosed in Note 2 “Summary of Significant Accounting Policies” to the Company’s consolidated financial statements included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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3. Goodwill and Intangible Assets

Intangible assets, net consisted of the following at September 30, 2021 and December 31, 2020, respectively:

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(8,037	)	$	16,963
Customer Relationships		18,000		(4,050	)		13,950
Trade Name		1,000		(747	)		253
Purchased software		1,817		(322	)		1,495
Totals as of September 30, 2021	$	45,817	$	(13,156	)	$	32,661

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(5,358	)	$	19,642
Customer Relationships		18,000		(2,700	)		15,300
Trade Name		1,000		(498	)		502
Purchased software		432		(32	)		400
Totals as of December 31, 2020	$	44,432	$	(8,588	)	$	35,844

As of September 30, 2021, amortization expense on existing intangible assets for the next five years and beyond is as follows:

Year Ending December 31,
Remainder of 2021	$	1,532
2022		5,958
2023		5,760
2024		5,656
2025		5,651
Thereafter		8,104
	$	32,661

A summary of amortization expense recorded during the three and nine months ended September 30, 2021 and 2020 is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product cost of revenue	$	893	$	893	$	2,679	$	2,679
Research and development		105		—		290		—
Selling, general and administrative		533		533		1,599		1,600
Totals	$	1,531	$	1,426	$	4,568	$	4,279

The Company’s goodwill is the result of its acquisition of NetComm on July 1, 2019 and represents the excess of purchase price over the estimated fair value of net assets acquired. There has been no change to the $50,177 carrying amount of goodwill since December 31, 2020.

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4. Inventory

Inventory as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Raw materials	$	49,297	$	50,904
Work in process		—		19
Finished goods:
Manufactured finished goods		41,730		49,764
Deferred inventory costs		826		517
	$	91,853	$	101,204

5. Property and Equipment

Property and equipment as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021			December 31, 2020
Computers and purchased software	$	25,284		$	24,865
Leasehold improvements		4,185			4,148
Furniture and fixtures		2,670			2,644
Machinery and equipment		37,427			36,701
Land		3,091			3,091
Building		4,765			4,765
Building improvements		7,282			7,244
Trial systems at customers’ sites		4,232			5,300
		88,936			88,758
Less: Accumulated depreciation and amortization		(64,289	)		(59,878	)
	$	24,647		$	28,880

During the nine months ended September 30, 2021 and 2020, the Company transferred trial systems into inventory from property and equipment with values of $1,145 and $690, respectively, net of transfers of trial systems to cost of revenue. In addition, the Company transferred $325 and $766 of equipment into inventory from property and equipment during the nine months ended September 30, 2021 and 2020, respectively.

Depreciation and amortization expense on property and equipment totaled $2,258 and $2,968 for the three months ended September 30, 2021 and 2020, respectively, and $7,418 and $9,370 for the nine months ended September 30, 2021 and 2020, respectively.

6. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Accrued compensation and related taxes	$	16,919	$	22,785
Inventory-related accruals		4,619		855
Accrued warranty		2,483		2,354
Other accrued expenses		9,347		13,799
	$	33,368	$	39,793

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Accrued Warranty

Substantially all of the Company’s products are covered by warranties for software and hardware for periods ranging from 90 days to one year. In addition, in conjunction with customers’ renewals of maintenance and support contracts, the Company offers an extended warranty for periods typically of one to three years for agreed-upon fees. In the event of a failure of a hardware product or software covered by these warranties, the Company must repair or replace the software or hardware or, if those remedies are insufficient, and at the discretion of the Company, provide a refund. The Company’s warranty reserve, which is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets, reflects estimated material, labor and other costs related to potential or actual software and hardware warranty claims for which the Company expects to incur an obligation. The Company’s estimates of anticipated rates of warranty claims and the costs associated therewith are primarily based on historical information and future forecasts. The Company periodically assesses the adequacy of the warranty reserve and adjusts the amount as necessary. If the historical data used to calculate the adequacy of the warranty reserve are not indicative of future requirements, additional or reduced warranty reserves may be required.

A summary of changes in the amount reserved for warranty costs for the nine months ended September 30, 2021 and 2020 is as follows:

	Nine Months Ended September 30,
	2021			2020
Warranty reserve at beginning of period	$	2,354		$	2,448
Provisions		2,015			2,054
Charges		(1,886	)		(2,103	)
Warranty reserve at end of period	$	2,483		$	2,399

7. Fair Value Measurements

The following tables present information about the fair value of the Company’s financial assets and liabilities as of September 30, 2021 and December 31, 2020 and indicate the level of the fair value hierarchy utilized to determine such fair values:

	Fair Value Measurements as of September 30, 2021 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,000	$	—	$	1,000
Money market mutual funds		127,221		—		—		127,221
Foreign currency forward contracts		—		24		—		24
	$	127,221	$	1,024	$	—	$	128,245
Liabilities:
SARs	$	—	$	—	$	458	$	458
	$	—	$	—	$	458	$	458

	Fair Value Measurements as of December 31, 2020 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,006	$	—	$	1,006
Money market mutual funds		114,404		—		—		114,404
	$	114,404	$	1,006	$	—	$	115,410
Liabilities:
SARs	$	—	$	—	$	493	$	493
	$	—	$	—	$	493	$	493

During the nine months ended September 30, 2021 and 2020, there were no transfers between Level 1, Level 2 and Level 3.

15

There were no changes to the valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2021 from those included in the Company’s consolidated financial statements for the year ended December 31, 2020. The following table provides a summary of changes in the fair values of the Company’s SARs liability, for which fair value is determined by Level 3 inputs:

	Nine Months Ended September 30,
	2021			2020
Fair value at beginning of period	$	493		$	264
Change in fair value		100			(7	)
Exercises		(135	)		—
Fair value at end of period	$	458		$	257

8. Derivative Instruments

The Company has certain international customers that are billed in foreign currencies. To mitigate the volatility related to fluctuations in the foreign exchange rates for accounts receivable denominated in foreign currencies, the Company enters into foreign currency forward contracts. As of September 30, 2021, the Company had foreign currency forward contracts outstanding with notional amounts totaling 1,379 Euros maturing in the fourth quarter of 2021 and the first quarter of 2022.  As of December 31, 2020, no foreign currency forward contracts were outstanding.

The Company’s foreign currency forward contracts described above economically hedged certain risks but were not designated as hedges for financial reporting purposes, and accordingly, all changes in the fair value of the derivative instruments were recorded as unrealized foreign currency transaction gains or losses and were included in the condensed consolidated statements of operations and comprehensive (loss) income as a component of other income (expense). The Company records derivative instruments in the condensed consolidated balance sheet at their fair values. As of September 30, 2021, the Company recorded an asset of $24 relating to outstanding foreign currency forward contracts. As of December 31, 2020 the Company recorded no asset relating to outstanding foreign currency forward contracts.  As of September 30, 2021 and December 31, 2020, the Company recorded no liability relating to outstanding foreign currency forward contracts.

The Company also faces exposure to foreign currency exchange rate fluctuations, as a certain portion of its expenses are denominated in currencies other than U.S. dollars. In certain instances, the Company utilizes forward contracts to hedge against foreign currency fluctuations. These contracts are used to minimize foreign gains or losses, as the gains or losses on the derivative are intended to offset the losses or gains on the underlying exposure. The Company does not engage in foreign currency speculation.

The Company designed its foreign currency risk management strategy principally to mitigate the potential financial impact of changes in the value of transactions and balances denominated in foreign currencies resulting from changes in foreign currency exchange rates. The Company may enter into cash flow hedges that utilize foreign currency forward contracts to hedge specific forecasted transactions of its foreign subsidiaries with the goal of protecting its budgeted expenses against foreign currency exchange rate changes compared to its budgeted rates.

During the three months ended September 30, 2020, the Company settled one cash flow hedge with a notional amount of 5,000 AUD to hedge certain Australian dollar cash flows incurred during the period. The amount of gain reclassified from other comprehensive (loss) income for the three months ended September 30, 2020 was $527. The full amount of the fair value of the derivatives on the settlement date of $725 was recognized as $57 cost of goods sold, $353 research and development expense and $315 selling, general and administrative expense in the condensed consolidated statement of comprehensive (loss) income for the three months ended September 30, 2020.

During the nine months ended September 30, 2020, the Company settled two cash flow hedges with notional amounts of 8,500 AUD and 5,000 AUD to hedge certain Australian dollar cash flows incurred during the period. The amount of gain reclassified from other comprehensive (loss) income for the nine months ended September 30, 2020 was $752. The full amount of the fair value of the derivatives on the settlement date of $1,613 was recognized as $124 cost of goods sold, $890 research and development expense and $599 selling, general and administrative expense in the condensed consolidated statement of comprehensive (loss) income for the nine months ended September 30, 2020.

The Company did not have any cash flow hedges outstanding as of September 30, 2021 and December 31, 2020.

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9. Income Taxes

The Company’s effective income tax rate was 85.8% and 40.9% for the three months ended September 30, 2021 and 2020, respectively. The (benefit from) provision for income taxes was $(5,288) and $2,399 for the three months ended September 30, 2021 and 2020, respectively. The change in the (benefit from) provision for income taxes was primarily due to a discrete benefit of ($7,097) recorded in the three months ended September 30, 2021 related to a change in estimate of the Company’s prior year net operating loss that is able to be carried back as part of the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”). The change in the (benefit from) provision for income taxes was also impacted by changes in the jurisdictional mix of earnings period over period.

The Company’s effective income tax rate was 11.6% and 142.0% for the nine months ended September 30, 2021 and 2020, respectively. The provision for (benefit from) income taxes was $220 and $(5,433) for the nine months ended September 30, 2021 and 2020, respectively. The change in the provision for (benefit from) income taxes was primarily due to a discrete tax benefit of $ (9,310) recorded during the nine months ended September 30, 2020 associated with the enactment of the CARES Act, partially offset by a discrete benefit of ($7,097) recorded during the nine months ended September 30, 2021 associated with a change in estimate of the Company’s prior year net operating loss that is able to be carried back as part of the CARES Act. The change in the provision for (benefit from) income taxes was also impacted by changes in the jurisdictional mix of earnings period over period. 

The (benefit from) provision for income taxes for the three and nine months ended September 30, 2021 and 2020 differed from the federal statutory rate primarily due to the geographical mix of earnings and related foreign tax rate differential, permanent differences, research and development tax credits, foreign tax credits, the valuation allowance maintained against certain deferred tax assets and withholding taxes.

10. Debt

The aggregate principal amount of debt outstanding as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,		December 31,
	2021		2020
Term loan	$	278,975	$	288,000
Revolving credit facility		6,500		6,500
Total principal amount of debt outstanding	$	285,475	$	294,500

Current and non-current debt obligations reflected in the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,			December 31,
	2021			2020
Current liabilities:
Term loan	$	3,000		$	9,775
Revolving credit facility		6,500			6,500
Current portion of principal payment obligations		9,500			16,275
Unamortized debt issuance costs, current portion		(1,079	)		(1,104	)
Current portion of long-term debt, net of    unamortized debt issuance costs	$	8,421		$	15,171
Non-current liabilities:
Term loan	$	275,975		$	278,225
Unamortized debt issuance costs, non-current portion		(1,303	)		(2,140	)
Long-term debt, net of current portion and    unamortized debt issuance costs	$	274,672		$	276,085

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As of September 30, 2021, aggregate minimum future principal payments of the Company’s debt are summarized as follows:

Year Ending December 31,
Remainder of 2021	$	7,250
2022		3,000
2023		275,225
Thereafter		—
	$	285,475

Term Loan and Revolving Credit Facilities

On December 20, 2016, the Company entered into a credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, various lenders and JPMorgan Chase Bank, N.A. and Barclays Bank PLC providing for (i) a term loan facility of $300,000 and (ii) a revolving credit facility of up to $25,000 in revolving credit loans and letters of credit.

As of September 30, 2021 and December 31, 2020, $278,975 and $288,000 in principal amount, respectively, were outstanding under the term loan facility (the “Term Loan”).  As of September 30, 2021 and December 31, 2020, the Company had outstanding borrowings under the revolving credit facility of $6,500, which were repaid in full on October 25, 2021 using cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2021. See Note 18, Subsequent Events below for further discussion. As of September 30, 2021 and December 31, 2020, the Company had also used $1,450 and $1,454 of available credit under the revolving credit facility for two stand-by letters of credit, one which serves as collateral to one of the Company’s customers pursuant to a contractual performance guarantee and one which serves as collateral for operating leases in Australia. In addition, the Company may, subject to certain conditions, including the consent of the administrative agent and the institutions providing such increases, increase the facilities by an unlimited amount so long as the Company is in compliance with specified leverage ratios, or otherwise by up to $70,000.

Borrowings under the facilities bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at the Company’s option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the term loan facility is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans and 0.75% per annum for base rate loans, subject to reduction based on the Company’s maintaining specified net leverage ratios. The interest rates payable under the facilities are subject to an increase of 2.00% per annum during the continuance of any payment default.

For Eurodollar rate loans, the Company may select interest periods of one, three or six months or, with the consent of all relevant affected lenders, twelve months. Interest will be payable at the end of the selected interest period, but no less frequently than every three months within the selected interest period. Interest on any base rate loan is not set for any specified period and is payable quarterly. The Company has the right to convert Eurodollar rate loans into base rate loans and the right to convert base rate loans into Eurodollar rate loans at its option, subject, in the case of Eurodollar rate loans, to breakage costs if the conversion is effected prior to the end of the applicable interest period. As of September 30, 2021 and December 31, 2020, the interest rate on the Term Loans was 5.00% per annum, which was based on a one-month and six-month Eurodollar rate, respectively, at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans. As of September 30, 2021, the interest rate on the revolving credit facility was 1.83% per annum, which was based on a one-month Eurodollar rate of 0.08% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans. As of December 31, 2020, the interest rate on the revolving credit facility was 2.12% per annum, which was based on the six-month Eurodollar rate of 0.37% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans.

Upon entering into the term loan facility, the Company incurred debt issuance costs of $7,811, which were initially recorded as a reduction of the debt liability and are amortized to interest expense using the effective interest method from the issuance date of the Term Loan until the maturity date. The Company made principal payments of $750 during each of the three months ended September 30, 2021 and 2020, and $9,025 and $2,250 during the nine months ended September 30, 2021 and 2020, respectively, under the term loan facility. No principal payments were made under the revolving credit facility during the three and nine months ended September 30, 2021 and 2020. Interest expense for the Term Loan and revolving credit facility, including the amortization of debt issuance costs, totaled $3,870 and $3,892 for the three months ended September 30, 2021 and 2020, respectively, and totaled $11,672 and $12,366 for the nine months ended September 30, 2021 and 2020, respectively.

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The revolving credit facility also requires payment of quarterly commitment fees at a rate of 0.25% per annum on the difference between committed amounts and amounts actually borrowed under the facility and customary letter of credit fees. For each of the three months ended September 30, 2021 and 2020, interest expense related to the fee for the unused amount of the revolving credit facility totaled $11 and for the nine months ended September 30, 2021 and 2020, interest expense related to the fee for the unused amount of the revolving credit facility totaled $33 and $41, respectively.

The Term Loan matures on December 20, 2023, and the revolving credit facility matures on December 20, 2021. The Term Loans are subject to amortization in equal quarterly installments, which commenced on March 31, 2017, of principal in an annual aggregate amount equal to 1.0% of the original principal amount of the Term Loans of $300,000, with the remaining outstanding balance payable at the date of maturity.

Voluntary prepayments of principal amounts outstanding under the term loan facility are permitted at any time; however, if a prepayment of principal is made with respect to a Eurodollar loan on a date other than the last day of the applicable interest period, the Company is required to compensate the lenders for any funding losses and expenses incurred as a result of the prepayment. Prior to the revolving credit facility maturity date, funds borrowed under the revolving credit facility may be borrowed, repaid and reborrowed, without premium or penalty.

In addition, the Company is required to make mandatory prepayments under the facilities with respect to (i) 100% of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by the Company or certain of its subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100% of the net cash proceeds from the issuance or incurrence of any additional debt by the Company or certain of its subsidiaries, subject to certain exceptions, and (iii) 50% of the Company’s excess cash flow, as defined in the credit agreement, subject to reduction upon its achievement of specified performance targets. In accordance with these provisions, a mandatory early prepayment of $6,775 was paid by the Company on April 2, 2021.  This amount was included in the current portion of long-term debt, net of unamortized debt issuance costs on the condensed consolidated balance sheet as of December 31, 2020.

The facilities are secured by, among other things, a first priority security interest, subject to permitted liens, in substantially all of the Company’s assets and all of the assets of certain of its subsidiaries and a pledge of certain of the stock of certain of its subsidiaries, in each case subject to specified exceptions. The facilities contain customary affirmative and negative covenants, including certain restrictions on the Company’s ability to pay dividends, and with respect to the revolving credit facility, a financial covenant requiring the Company to maintain a specified total net leverage ratio in the event that on the last day of any fiscal quarter the Company has utilized more than 30% of its borrowing capacity under the facility. The Company was in compliance with all covenants as of September 30, 2021 and December 31, 2020.

Commercial Mortgage Loan

On July 1, 2015, the Company entered into a commercial mortgage loan agreement in the amount of $7,950 (the “Mortgage Loan”). Borrowings under the Mortgage Loan bore interest at a rate of 3.5% per annum and were repayable in 60 monthly installments of $46, consisting of principal and interest based on a 20-year amortization schedule. The remaining amount of unpaid principal under the Mortgage Loan was paid on the maturity date of July 1, 2020 utilizing the Company’s revolving credit facility. Upon entering into the Mortgage Loan, the Company incurred debt issuance cost of $45, which was initially recorded as a direct deduction from the debt liability and was amortized to interest expense using the effective interest method from the issuance date of the loan until the maturity date.

The Mortgage Loan was paid on the maturity date of July 1, 2020, utilizing the Company’s revolving credit facility.  The Company made principal payments under the Mortgage Loan of $6,483 and $6,643 during the three and nine months ended September 30, 2020, respectively. No interest expense was incurred during the three months ended September 30, 2020.  Interest expense, including the amortization of debt issuance costs, totaled $120 during the nine months ended September 30, 2020.

11. Stockholders’ Equity 

In connection with special dividends previously declared, the board of directors also approved cash payments to be made to holders of the Company’s stock options, SARs and RSUs as equitable adjustments to the holders of such instruments in accordance with the provisions of the Company’s equity incentive plans. These equitable adjustment payments are equal to

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an amount per share multiplied by the net number of shares subject to outstanding equity awards after applying the treasury stock method. The below table provides details of these equitable adjustment payments:

				Equitable Adjustment Payments
				Nine Months Ended				Equitable Adjustment Liability(1)
Dividend Declaration Dates	Equitable Adjustment per share		Year of Final Vesting	September 30, 2021		September 30, 2020		As of September 30, 2021		As of December 31, 2020
November 30, 2017	$	0.5802	2021	$	42	$	136	$	1	$	30
May 10, 2017		1.1774	2021		53		176		—		31
December 27, 2016		2.3306	2020		2		295		—		2
June 17, 2016		0.5891	2020		—		54		—		—
Total				$	97	$	661	$	1	$	63

(1) Net of estimated forfeitures. Actual payouts may vary based on actual forfeitures. Amounts are included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets.

Stock Repurchase Program

On February 21, 2019, the Company announced a stock repurchase program authorizing it to repurchase up to $75,000 of the Company’s common stock. There were no repurchases made during the three and nine months ended September 30, 2021.  There were no repurchases during the three months ended September 30, 2020.  During the nine months ended September 30, 2020, the Company repurchased 1,227 shares, at a cost of $3,031, including commissions. As of September 30, 2021, $70,208 remained authorized for repurchases of the Company’s common stock under the stock repurchase program. The stock repurchase program has no expiration date and does not require the Company to purchase a minimum number of shares, and the Company may suspend, modify or discontinue the stock repurchase program at any time without prior notice.

12. Stock-based Compensation

2017 Stock Incentive Plan

The Company’s 2017 Stock Incentive Plan (the “2017 Plan”) provides for the Company to sell or issue common stock or restricted common stock, or to grant qualified incentive stock options, nonqualified stock options, SARs, performance-based restricted stock units (“PSUs”), RSUs or other stock-based awards to the Company’s employees, officers, directors, advisors and outside consultants. The total number of shares authorized for issuance under the 2017 Plan was 20,617 shares as of September 30, 2021, of which 9,755 shares remained available for future grant.

Stock Options

The following table summarizes the outstanding stock option activity and a summary of information related to stock options as of and for the nine months ended September 30, 2021:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)
Outstanding at January 1, 2021		7,120		$	8.01		4.88	$	9,367
Granted		116			8.23
Exercised		(904	)		2.26
Forfeited		(292	)		10.70
Outstanding at September 30, 2021		6,040		$	8.74		4.53	$	7,200
Options exercisable at September 30, 2021		5,665		$	8.69		4.28	$	6,924
Vested or expected to vest at September 30, 2021		6,032		$	8.74		4.52	$	7,182

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The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
Risk-free interest rate	1.0%	0.4%	1.0%	0.4%-0.7%
Expected term (in years)	6.1	6.1	6.1	6.1
Expected volatility	38.6%	31.8%	38.2%-38.6%	29.3%-31.8%
Expected dividend yield	0.0%	0.0%	0.0%	0.0%

The weighted-average grant-date fair value of options granted during the nine months ended September 30, 2021 and 2020 was $3.15 and $0.98 per share, respectively. Cash proceeds received upon the exercise of options were $3,532 and $955 during the nine months ended September 30, 2021 and 2020, respectively. The intrinsic value of stock options exercised during the nine months ended September 30, 2021 and 2020 was $5,182 and $1,480, respectively. The aggregate intrinsic value is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the Company’s common stock.

Restricted Stock Units

A summary of RSU activity under the Company’s 2011 Stock Incentive Plan (the “2011 Plan”) and the 2017 Plan for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		4,231		$	5.43
Granted		1,660			8.26
Vested		(1,241	)		6.15	$	10,149
Forfeited		(270	)		4.68
Unvested balance at September 30, 2021		4,380		$	6.34

The Company withheld 779 and 150 shares of common stock in settlement of employee tax withholding obligations due upon the vesting of RSUs and PSUs during the nine months ended September 30, 2021 and 2020, respectively.

Performance-Based Stock Units

During the nine months ended September 30, 2021 and 2020, the Company granted PSUs to certain employees that vest over a three-year period based on the achievement of performance goals and continued performance of services.  The performance goals consist solely of market-based vesting conditions, determined by the Company’s level of achievement of pre-established parameters relating to the performance of the Company’s stock price as set by the Board of Directors. Vesting may occur at any time during the three-year period.

Compensation expense is based on the estimated value of the awards on the grant date, and is recognized over the period from the grant date through the expected vest dates of each vesting condition, both of which were estimated based on a Monte Carlo simulation model applying the following key assumptions:

	Nine Months Ended September 30,
	2021	2020
Risk-free interest rate	0.2%	1.2%
Volatility	78.6%	70.0%
Dividend yield	0.0%	0.0%
Cost of equity	12.0%	11.0%

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A summary of PSU activity for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		737		$	3.22
Granted		442			7.89
Vested		(737	)		3.22	$	6,449
Forfeited		—			—
Unvested balance at September 30, 2021		442		$	7.89

Stock Appreciation Rights

Over time, the Company has granted SARs that allow the holder the right, upon exercise, to receive in cash the amount of the difference between the fair value of the Company’s common stock at the date of exercise and the price of the underlying common stock at the date of grant of each SAR. The SARs vested over a four-year period from the date of grant and expire ten years from the date of grant. During the nine months ended September 30, 2021, 20 SARs were exercised with a fair value of $6.75 per share. As of September 30, 2021, 200 outstanding and fully vested SARs were exercisable with a weighted-average fair value of $2.29 per SAR. The fair value of the SAR liability as of September 30, 2021 and December 31, 2020 was $458 and $493, respectively (see Note 7), and was included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets.

Stock-Based Compensation Expense

Stock-based compensation expense related to stock options, RSUs, SARs and PSUs for the three and nine months ended September 30, 2021 and 2020 was classified in the condensed consolidated statements of operations and comprehensive (loss) income as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenue	$	29	$	45	$	95	$	115
Research and development expenses		557		592		1,971		1,679
Selling, general and administrative expenses		3,112		2,845		9,179		7,704
Total stock-based compensation	$	3,698	$	3,482	$	11,245	$	9,498

The Company recognized stock-based compensation expense for the three and nine months ended September 30, 2021 and 2020 in the condensed consolidated balance sheet as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021		2020
Change in fair value of SAR Liability	$	(188	)	$	(14	)	$	100	$	(7	)
Recognized as additional paid-in capital		3,886			3,496			11,145		9,505
Total stock-based compensation	$	3,698		$	3,482		$	11,245	$	9,498

As of September 30, 2021, there was $25,442 of unrecognized compensation cost related to outstanding stock options, RSUs, SARs and PSUs, which is expected to be recognized over a weighted-average period of 2.67 years.

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13. Net (Loss) Income per Share

Basic and diluted net (loss) income per share attributable to common stockholders was calculated as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021			2020		2021		2020
Numerator:
Net (loss) income attributable to common    stockholders, basic and diluted	$	(876	)	$	3,473	$	1,680	$	1,607
Denominator:
Weighted-average shares used to compute net   (loss) income per share attributable to common    stockholders, basic		85,660			83,302		84,985		83,437
Dilutive effect of stock options		—			1,125		1,765		1,207
Dilutive effect of restricted stock units		—			1,039		2,198		726
Weighted-average shares used to compute net    (loss) income per share attributable to common    stockholders, diluted		85,660			85,466		88,948		85,370
Net (loss) income per share attributable to common    stockholders:
Basic	$	(0.01	)	$	0.04	$	0.02	$	0.02
Diluted	$	(0.01	)	$	0.04	$	0.02	$	0.02

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the computation of diluted net (loss) income per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Options to purchase common stock		6,040		4,156		3,459		4,156
Unvested restricted stock units		4,380		1,001		723		1,001
Unvested performance-based stock units		442		983		—		983

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14. Revenue from Contracts with Customers

Disaggregation of revenue

The Company disaggregates its revenue by product and service in the condensed consolidated statements of operations and comprehensive (loss) income. Performance obligations related to product revenue are recognized at a point in time, while performance obligations related to service revenue are recognized over time. The Company also disaggregates its revenue based on geographic locations of its customers, as determined by the customer’s shipping address, summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
North America:
United States	$	40,671	$	32,036	$	101,534	$	90,825
Canada		11,087		6,428		61,875		15,170
Total North America		51,758		38,464		163,409		105,995
Europe, Middle East and Africa:		6,547		6,047		19,478		27,493
Asia-Pacific:
Australia		24,329		38,889		68,527		86,848
Other		8,832		10,014		24,526		31,884
Total Asia-Pacific		33,161		48,903		93,053		118,732
Latin America		7,753		12,333		20,286		20,500
Total revenue(1)	$	99,219	$	105,747	$	296,226	$	272,720

(1) Other than the United States, Canada and Australia, no individual countries represented 10% or more of the Company’s total revenue for any of the periods presented.

The Company also disaggregates its revenue based on product line summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product revenue:
Wireless	$	43,070	$	26,825	$	116,081	$	62,992
Fixed telco		20,187		34,005		51,209		75,756
Cable		24,495		32,911		94,729		100,879
Total product revenue		87,752		93,741		262,019		239,627
Service revenue:
Wireless		1,141		2,396		3,416		5,244
Fixed telco		825		441		3,474		992
Cable		9,501		9,169		27,317		26,857
Total service revenue		11,467		12,006		34,207		33,093
Total revenue	$	99,219	$	105,747	$	296,226	$	272,720

Costs to Obtain or Fulfill a Contract

As of September 30, 2021 and December 31, 2020, the Company had short-term capitalized contract costs of $96 and $95, respectively, which are included in prepaid expenses and other current assets and had long-term capitalized contract costs of $67 and $70, respectively, which are included in other assets in the accompanying condensed consolidated balance sheets. During the three months ended September 30, 2021 and 2020, amortization expense associated with capitalized contract costs was $23 and $76, respectively, and during the nine months ended September 30, 2021 and 2020 was $75 and $524, respectively, all of which was recorded to selling, general and administrative expenses in the accompanying condensed consolidated statements of operations and comprehensive (loss) income.

Contract Balances

Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue when the Company satisfies its performance obligations, consistent with the above methodology. For the three and nine months ended September 30, 2021, the Company recognized $1,726 and $13,706, respectively, of revenue that was included in deferred revenue as of December 31, 2020.  For the three and nine months ended September 30, 2020, the Company recognized $9,857 and $20,194, respectively, of revenue that was included in deferred revenue as of December 31, 2019.

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The Company receives payments from customers based upon contractual billing terms. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include amounts related to the Company’s contractual right to consideration for both completed and partially completed performance obligations that may not have been invoiced. As of September 30, 2021 and December 31, 2020, the Company included contract assets of $781 and $771, respectively, which is netted with deferred revenue in the accompanying condensed consolidated balance sheets.

Transaction price allocated to the remaining performance obligations

As of September 30, 2021, the aggregate remaining amount of revenue expected to be recognized related to unsatisfied or partially unsatisfied performance obligations was $20,929, which consists of deferred revenue. The Company expects approximately 76% of this amount to be recognized in the next twelve months with the remaining amount to be recognized over the next two to five years.

Other Revenue Recognition Policies

The Company’s customary payment terms are generally 90 days or less. If the Company provides extended payment terms that represent a significant financing component, the Company adjusts the amount of promised consideration for the time value of money using an appropriate discount rate and recognizes interest income separate from the revenue recognized on contracts with customers. During the three months ended September 30, 2021 and 2020, the Company recorded interest income of $6 and $10, respectively, and during the nine months ended September 30, 2021 and 2020, the Company recorded interest income of $14 and $57, respectively, all of which were recorded in the condensed consolidated statements of operations and comprehensive (loss) income.  

15. Segment Information

The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is regularly evaluated by the Company’s chief operating decision maker, or decision-making group, in deciding how to allocate resources and assess performance. The Company has determined that its chief operating decision maker is its President and Chief Executive Officer. The Company’s chief operating decision maker reviews the Company’s financial information on a consolidated basis for purposes of allocating resources and assessing financial performance. Since the Company operates as one operating segment, all required financial segment information can be found in these condensed consolidated financial statements.

The Company’s property and equipment, net by location was as follows:

	September 30, 2021		December 31, 2020
United States	$	17,431	$	20,988
China		3,144		2,986
Australia		2,236		2,849
Other		1,836		2,057
Total property and equipment, net	$	24,647	$	28,880

16. Related Parties

Employment of Rongke Xie

Rongke Xie, who serves as Deputy General Manager of Guangzhou Casa Communication Technology LTD (“Casa China”), a subsidiary of the Company, is the sister of Lucy Xie, the Company’s Senior Vice President of Operations and a member of the Company’s board of directors. Casa China paid Rongke Xie $187 and $153 in total compensation during the nine months ended September 30, 2021 and 2020, respectively, for her services as an employee.

To date, the Company has granted to Rongke Xie 116 RSUs which vest over four annual periods. The grant-date fair value of the awards totaled $500, which is recorded as stock-based compensation expense over the vesting period of the awards. During the three months ended September 30, 2021 and 2020, the Company recognized selling, general and administrative expenses of $28 and $25 related to these awards, and during the nine months ended September 30, 2021 and 2020, the Company recognized selling, general and administrative expenses of $78 and $62 related to these awards.   

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17. Commitments and Contingencies

Indemnification

The Company has, in the ordinary course of business, agreed to defend and indemnify certain customers against third-party claims asserting (i) infringement of certain intellectual property rights, which may include patents, copyrights, trademarks or trade secrets, and (ii) certain other harms caused by the acts or omissions of the Company.

As permitted under Delaware law, the Company indemnifies its officers, directors and employees for certain events or occurrences that happen by reason of their relationship with or position held at the Company.

As of September 30, 2021 and December 31, 2020, the Company had not experienced any material losses related to these indemnification obligations and no material claims were outstanding where a contingent loss was considered to be probable or reasonably estimable. The Company does not expect significant claims related to these indemnification obligations and, consequently, concluded that the fair value of these obligations is negligible, and no related liabilities were recorded in its condensed consolidated financial statements.

Litigation

The complete response to this section regarding legal proceedings is incorporated by reference herein to Part II Item I in this 10-Q.

18. Subsequent Events

Revolving Credit Facility

On October 25, 2021, the Company repaid all outstanding borrowings under the revolving credit facility utilizing funds held in cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2021. Repayment of the revolving credit facility included $6,500 of outstanding principal and $7 of outstanding interest on the payoff date. As noted in Note 10, Debt, the full $6,500 outstanding balance was included in current portion of long-term debt, net of unamortized debt issuance costs on the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020.

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

The following discussion of our financial condition and results of operations should be read together with our condensed consolidated financial statements and related notes and other financial information included elsewhere in this Quarterly Report on Form 10-Q. The following discussion contains forward-looking statements that reflect our plans, estimates and beliefs. Our actual results could differ materially from those discussed in the forward-looking statements. Factors that could cause or contribute to these differences include those discussed below and elsewhere in this Quarterly Report on Form 10-Q, particularly in the section titled “Risk Factors.” For discussion comparing the period ended September 30, 2020 and September 30, 2019, please refer to our Quarterly Report on form 10-Q, filed with the SEC on October 29, 2020.

Overview

Our solutions are conceived, designed and built to enable our CSP customers to offer high bandwidth data services to their subscribers, and to transform their networks to meet the growing demand for bandwidth and to enable the introduction of new revenue-generating services. We offer physical, virtual and cloud-native 5G broadband and customer premise networking equipment for public and private high-speed data and multi-service communications networks. Our core and edge broadband technology enables CSPs and enterprises to cost-effectively and dynamically increase data network speed for their subscribers, add bandwidth capacity and new services, reduce network complexity, and reduce operating and capital expenditures.

We offer scalable solutions that can meet the evolving bandwidth needs of our customers and their subscribers. Our first installation in a service provider’s network frequently involves deploying our broadband products in only a portion of the provider’s network and, for our cable products, with only a fraction of the capacity of our products enabled at the time of initial installation. Over time, our customers have generally expanded the use of our solutions to other areas of their networks to extend network coverage or increase network capacity.

Our solutions are commercially deployed in over 70 countries by more than 475 customers, including regional service providers as well as some of the world’s largest Tier 1 CSPs, serving millions of subscribers.

COVID-19 Pandemic

The COVID-19 pandemic presents various risks to us, not all of which we are able to fully evaluate or even to foresee at the current time, and which could have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While we remain fully operational, during the three and nine months ended September 30, 2021, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on our financial results.  In particular, certain of our products utilize components, for which there has been increased global demand.  As a result, throughout 2021, and increasingly during the three months ended September 30, 2021, we began to see shortages of supply that resulted in our inability to fulfill certain customer orders within normal lead times.  This adversely impacted our revenue and operating results for the three and nine months ended September 30, 2021. While we continue to work with our supply chain, contract manufacturers, and customers to minimize the extent of such impacts, we expect the effects of global supply chain issues to continue and cannot predict when such effects will subside.  This may prevent us from being able to fulfill our customers’ orders in a timely manner or at all, which could lead to one or more of our customers cancelling their orders.  At this time, we are neither able to estimate the extent of these impacts nor predict whether our efforts to minimize or contain them will be successful. We intend to continue to monitor our business very closely for any effects of COVID-19 for as long as necessary.

In addition to the negative impact on our business from global supply chain constraints related to COVID-19, we saw certain benefits that included decreases in certain operating expenses, such as travel and trade show expense, and benefited from certain U.S. government tax relief measures, discussed further below, during the year ended December 31, 2020, and the three and nine months ended September 30, 2021.  We expect these benefits to gradually diminish as the various geographies in which we operate begin to recover from the pandemic.

For the nine months ended September 30, 2021, we were able to benefit from the CARES Act that was signed into law on March 27, 2020.  The CARES Act, among other things, includes tax provisions relating to refundable payroll tax credits, deferment of employer’s Social Security payments, net operating loss utilization and carryback periods, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property (QIP).  For the nine months ended September 30, 2021, we recognized a reduction to cost of goods sold of $0.6 million and a

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reduction in operating expenses of $4.3 million, in connection with a payroll tax credit under the CARES Act.  For the nine months ended September 30, 2021 and 2020, we recognized an income tax benefit of $7.1 million and $9.3 million, respectively (see Note 9 to our accompanying financial statements). We will continue to evaluate the impact of the CARES Act on our financial position, results of operations, and cash flows.

Due to the above circumstances and as described generally in this Quarterly Report on Form 10-Q, our results of operations for the three and nine months ended September 30, 2021 are not necessarily indicative of the results to be expected in future periods. Management cannot predict the full impact of the COVID-19 pandemic on our sales channels, supply chain, manufacturing and distribution, or on economic conditions generally, including the effects on our current and potential customers, who may curtail spending on investments in current and/or new technologies, delay new equipment evaluations and trials, cancel orders, and possibly delay payments based on liquidity concerns, all of which could have a material impact on our business in the future. Similarly, our supply chain and our contract manufacturers could be affected, which could cause disruptions to our ability to meet customer demand or delivery schedules. For the three and nine months ended September 30, 2021, we did see certain delays in our supply chain that adversely impacted delivery schedules to our customers. If COVID-19 were to have such effects in the future, there would likely be a material adverse impact on our financial results, liquidity and capital resource needs. This uncertainty makes it challenging for management to estimate the future performance of our business, particularly in the near to medium term and the impact of COVID-19 could have a material adverse impact on our results of operations in the near to medium term.  

Results of Operations

The following tables set forth our consolidated results of operations in dollar amounts and as percentages of total revenue for the periods shown:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
	(in thousands)						(in thousands)
Revenue:
Product	$	87,752		$	93,741		$	262,019		$	239,627
Service		11,467			12,006			34,207			33,093
Total revenue		99,219			105,747			296,226			272,720
Cost of revenue(1):
Product		57,372			51,947			150,515			130,602
Service		1,223			1,206			3,532			3,741
Total cost of revenue		58,595			53,153			154,047			134,343
Gross profit		40,624			52,594			142,179			138,377
Operating expenses:
Research and development(1)		21,578			21,823			63,479			63,722
Selling, general and administrative(1)		21,029			21,630			64,492			67,731
Total operating expenses		42,607			43,453			127,971			131,453
(Loss) income from operations		(1,983	)		9,141			14,208			6,924
Other income (expense), net		(4,181	)		(3,269	)		(12,308	)		(10,750	)
(Loss) income before (benefit from) provision for income taxes		(6,164	)		5,872			1,900			(3,826	)
(Benefit from) provision for income taxes		(5,288	)		2,399			220			(5,433	)
Net (loss) income	$	(876	)	$	3,473		$	1,680		$	1,607

28

(1) Includes stock-based compensation expense related to stock options; SARs; RSUs; and PSUs, granted to employees, directors and non-employee consultants as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
	(in thousands)				(in thousands)
Cost of revenue	$	29	$	45	$	95	$	115
Research and development expense		557		592		1,971		1,679
Selling, general and administrative expense		3,112		2,845		9,179		7,704
Total stock-based compensation expense	$	3,698	$	3,482	$	11,245	$	9,498

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
	(as a percentage of total revenue)						(as a percentage of total revenue)
Revenue:
Product		88.4	%		88.6	%		88.5	%		87.9	%
Service		11.6			11.4			11.5			12.1
Total revenue		100.0			100.0			100.0			100.0
Cost of revenue:
Product		57.8			49.1			50.8			47.9
Service		1.2			1.1			1.2			1.4
Total cost of revenue		59.1			50.3			52.0			49.3
Gross profit		40.9			49.7			48.0			50.7
Operating expenses:
Research and development		21.7			20.6			21.4			23.4
Selling, general and administrative		21.2			20.5			21.8			24.8
Total operating expenses		42.9			41.1			43.2			48.2
(Loss) income from operations		(2.0	)		8.6			4.8			2.5
Other income (expense), net		(4.2	)		(3.1	)		(4.2	)		(3.9	)
(Loss) income before (benefit from) provision for income taxes		(6.2	)		5.6			0.6			(1.4	)
(Benefit from) provision for income taxes		(5.3	)		2.3			0.1			(2.0	)
Net (loss) income		(0.9	)%		3.3	%		0.6	%		0.6	%

Percentages in the table above are based on actual values. As a result, some totals may not sum due to rounding.

Three Months Ended September 30, 2021 Compared to the Three Months Ended September 30, 2020

	Three Months Ended September 30,
	2021					2020					Change
	Amount		% of Total			Amount		% of Total			Amount			%
	(dollars in thousands)
Revenue:
Product	$	87,752		88.4	%	$	93,741		88.6	%	$	(5,989	)		(6.4	)%
Service		11,467		11.6	%		12,006		11.4	%		(539	)		(4.5	)%
Total revenue	$	99,219		100.0	%	$	105,747		100.0	%	$	(6,528	)		(6.2	)%
Revenue by geographic region:
North America	$	51,758		52.2	%	$	38,464		36.4	%	$	13,294			34.6	%
Europe, Middle East and Africa		6,547		6.6	%		6,047		5.7	%		500			8.3	%
Asia-Pacific		33,161		33.4	%		48,903		46.2	%		(15,742	)		(32.2	)%
Latin America		7,753		7.8	%		12,333		11.7	%		(4,580	)		(37.1	)%
Total revenue	$	99,219		100.0	%	$	105,747		100.0	%	$	(6,528	)		(6.2	)%

29

	Three Months Ended September 30,				Change
	2021		2020		Amount			%
Product revenue:
Wireless	$	43,070	$	26,825	$	16,245			60.6	%
Fixed telco		20,187		34,005		(13,818	)		(40.6	)%
Cable		24,495		32,911		(8,416	)		(25.6	)%
Total product revenue		87,752		93,741		(5,989	)		(6.4	)%
Service revenue:
Wireless		1,141		2,396		(1,255	)		(52.4	)%
Fixed telco		825		441		384			87.1	%
Cable		9,501		9,169		332			3.6	%
Total service revenue		11,467		12,006		(539	)		(4.5	)%
Total revenue	$	99,219	$	105,747	$	(6,528	)		(6.2	)%

Product revenues during the three months ended September 30, 2021 were adversely affected by supply chain delays across all of our markets. Wireless revenues increased despite such delays, due to increased revenues from certain Tier 1 customers in the period, including increased sales of certain end of life products that are not expected to derive significant revenues in future periods. In addition to the impact of supply chain delays, our fixed telco revenue declined due to decreased revenues from one Tier 1 customer, whose planned network buildout is nearing its completion. The decline in cable revenue was primarily the result of the aforementioned supply chain delays.

The decrease in service revenue was primarily due to decreased sales of services in the three months ended September 30, 2021 as compared to the three months ended September 30, 2020.

Cost of Revenue and Gross Profit

	Three Months Ended September 30,				Change
	2021		2020		Amount		%
	(dollars in thousands)
Cost of revenue:
Product	$	57,372	$	51,947	$	5,425		10.4	%
Service		1,223		1,206		17		1.4	%
Total cost of revenue	$	58,595	$	53,153	$	5,442		10.2	%

	Three Months Ended September 30,
	2021					2020					Change
	Amount		Gross Margin			Amount		Gross Margin			Amount			Gross Margin (bps)
	(dollars in thousands)
Gross profit:
Product	$	30,380		34.6	%	$	41,794		44.6	%	$	(11,414	)		(1,000	)
Service		10,244		89.3	%		10,800		90.0	%		(556	)		(70	)
Total gross profit	$	40,624		40.9	%	$	52,594		49.7	%	$	(11,970	)		(880	)

The increase in cost of product revenue and the decrease in gross margin was due to product mix, with a lower proportion of higher margin software products and increased lower margin wireless customer premise equipment product sales.

Cost of service revenue and service gross margin remained relatively consistent period over period.

30

Research and Development

	Three Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Research and development	$	21,578		$	21,823		$	(245	)		(1.1	)%
Percentage of revenue		21.7	%		20.6	%

The decrease in research and development expense was primarily due to a $1.0 million decrease in purchases of research and development materials. This decrease was partially offset by a $0.8 million increase in personnel costs, driven by the impact of a cash flow hedge in 2020 and a pension benefit relief in China during the three months ended September 30, 2020, which did not repeat in 2021.

Selling, General and Administrative

	Three Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Selling, general and administrative	$	21,029		$	21,630		$	(601	)		(2.8	)%
Percentage of revenue		21.2	%		20.5	%

The decrease in selling, general and administrative expense was primarily driven by a $0.5 million decrease in personnel costs, due to a $1.4 million decrease in commissions, which was partially offset by an increase of $0.4 million in salaries and benefits mainly due to the impact of a cash flow hedge in 2020, an increase in travel expenses of $0.2 million and an increase in stock-based compensation of $0.3 million.  In addition, depreciation expense and professional fees decreased $0.4 million and $0.2 million, respectively, partially offset by an increase in other taxes of $0.5 million during the three months ended September 30, 2021.

Other Income (Expense), Net

	Three Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Other income (expense), net	$	(4,181	)	$	(3,269	)	$	(912	)		27.9	%
Percentage of revenue		(4.2	)%		(3.1	)%

The change in other income (expense), net was primarily due to a $0.4 million increase in foreign exchange losses due to fluctuations in the Australian dollar and the China Renminbi exchange rates, a $0.3 million decrease in other income due to a non-recurring research and development grant received in the three months ended September 30, 2021 and an increase of $0.2 million in interest expense due to increased interest rates.

(Benefit from) provision for Income Taxes

	Three Months Ended September 30,					Change
	2021			2020		Amount			%
	(dollars in thousands)
(Benefit from) provision for income taxes	$	(5,288	)	$	2,399	$	(7,687	)		(320.4	)%

The (benefit from) income taxes for the three months ended September 30, 2021 compared to the provision for income taxes for the three months ended September 30, 2020 was primarily due to a discrete benefit of $7.1 million recorded in the three months ended September 30, 2021 associated with a change in estimate of our prior year taxable net operating loss that is able to be carried back as part of the CARES Act. The change in the (benefit from) provision for income taxes was also impacted by changes in the jurisdictional mix of earnings period over period.

31

Nine Months Ended September 30, 2021 Compared to the Nine Months Ended September 30, 2020

	Nine Months Ended September 30,
	2021					2020					Change
	Amount		% of Total			Amount		% of Total			Amount			%
	(dollars in thousands)
Revenue:
Product	$	262,019		88.5	%	$	239,627		87.9	%	$	22,392			9.3	%
Service		34,207		11.5	%		33,093		12.1	%		1,114			3.4	%
Total revenue	$	296,226		100.0	%	$	272,720		100.0	%	$	23,506			8.6	%
Revenue by geographic region:
North America	$	163,409		55.2	%	$	105,995		38.9	%	$	57,414			54.2	%
Europe, Middle East and Africa		19,478		6.6	%		27,493		10.1	%		(8,015	)		(29.2	)%
Asia-Pacific		93,053		31.4	%		118,732		43.5	%		(25,679	)		(21.6	)%
Latin America		20,286		6.8	%		20,500		7.5	%		(214	)		(1.0	)%
Total revenue	$	296,226		100.0	%	$	272,720		100.0	%	$	23,506			8.6	%

	Nine Months Ended September 30,				Change
	2021		2020		Amount			%
Product revenue:
Wireless	$	116,081	$	62,992	$	53,089			84.3	%
Fixed telco		51,209		75,756		(24,547	)		(32.4	)%
Cable		94,729		100,879		(6,150	)		(6.1	)%
Total product revenue		262,019		239,627		22,392			9.3	%
Service revenue:
Wireless		3,416		5,244		(1,828	)		(34.9	)%
Fixed telco		3,474		992		2,482			250.2	%
Cable		27,317		26,857		460			1.7	%
Total service revenue		34,207		33,093		1,114			3.4	%
Total revenue	$	296,226	$	272,720	$	23,506			8.6	%

The increase in product revenue was primarily attributable to continued increased demand for our wireless products.  The increase in wireless revenue was partially offset by decreased revenue from our fixed telco products, which is due to decreased demand from a Tier 1 customer that is completing its network buildout, and decreased revenue from our cable products, which have been adversely affected by supply chain delays.

The overall increase in service revenue was primarily due to increased support renewals and sales of services in cable and fixed telco, which was partially offset by a decline in wireless service revenue that was due to an increase in sales of certain wireless customer premise equipment products, for which we do not sell service contracts.

Cost of Revenue and Gross Profit

	Nine Months Ended September 30,				Change
	2021		2020		Amount			%
	(dollars in thousands)
Cost of revenue:
Product	$	150,515	$	130,602	$	19,913			15.2	%
Service		3,532		3,741		(209	)		(5.6	)%
Total cost of revenue	$	154,047	$	134,343	$	19,704			14.7	%

32

	Nine Months Ended September 30,
	2021					2020					Change
	Amount		Gross Margin			Amount		Gross Margin			Amount		Gross Margin (bps)
	(dollars in thousands)
Gross profit:
Product	$	111,504		42.6	%	$	109,025		45.5	%	$	2,479		(290	)
Service		30,675		89.7	%		29,352		88.7	%		1,323		100
Total gross profit	$	142,179		48.0	%	$	138,377		50.7	%	$	3,802		(270	)

The increase in cost of product revenue was attributable to increased revenue. The overall product gross margin decline for the nine months ended September 30, 2021 as compared to the nine months ended September 30, 2020 was due to product mix, with lower margin wireless customer premise equipment products comprising a larger percentage of total revenue.

The decrease in cost of service revenue and increase in service gross margin were primarily due to a decrease in utilization of third-party professional services in the nine months ended September 30, 2021 as compared to the nine months ended September 30, 2020.

Research and Development

	Nine Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Research and development	$	63,479		$	63,722		$	(243	)		(0.4	)%
Percentage of revenue		21.4	%		23.4	%

The decrease in research and development expense was mainly due to a $1.6 million decrease in purchases of research and development materials.  This decrease was partially offset by increased personnel costs of $0.7 million, caused primarily by increased salaries and benefits of $3.3 million during the nine months ended September 30, 2021 due to the impact of a cash flow hedge in 2020 and an increase in average headcount, partially offset by a reduction in payroll taxes due to a CARES Act credit of $2.6 million during the nine months ended September 30, 2021.  Professional services increased $0.3 million in the nine months ended September 30, 2021. Allocated facilities and depreciation costs increased by $0.3 million driven by increased average headcount.

Selling, General and Administrative

	Nine Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Selling, general and administrative	$	64,492		$	67,731		$	(3,239	)		(4.8	)%
Percentage of revenue		21.8	%		24.8	%

33

The decrease in selling, general and administrative expense was primarily driven by a decrease of $1.2 million in professional services and a $1.9 million decrease in depreciation expense as assets that became fully depreciated were not replaced.  Personnel costs decreased by $0.5 million for the nine months ended September 30, 2021, driven by a $3.7 million decrease in commissions, a $0.7 million decrease in travel due to COVID-19, and a $1.6 million decrease in payroll taxes due to a CARES Act credit during the nine months ended September 30, 2021, partially offset by increases in salaries and benefits of $4.0 million, driven by the impact of a cash flow hedge in 2020, increased average headcount, and increased stock-based compensation of $1.5 million.  These decreases were partially offset by an increase in other taxes of $0.5 million during the three months ended September 30, 2021.

Other Income (Expense), Net

	Nine Months Ended September 30,						Change
	2021			2020			Amount			%
	(dollars in thousands)
Other income (expense), net	$	(12,308	)	$	(10,750	)	$	(1,558	)		14.5	%
Percentage of revenue		(4.2	)%		(3.9	)%

The change in other income (expense), net was primarily due to a $2.0 million increase in foreign exchange losses due to fluctuations in the Australian dollar and the China Renminbi exchange rates and a $0.6 million decrease in interest income due to lower interest rates, partially offset by a $0.8 million decrease in interest expense due to decreases in both the outstanding principal balance and the interest rate on our term loan facility.

(Benefit from) provision for Income Taxes

	Nine Months Ended September 30,						Change
	2021			2020			Amount		%
	(dollars in thousands)
(Benefit from) provision for income taxes	$	220		$	(5,433	)	$	5,653		(104.0	)%
Effective tax rate		11.6	%		142.0	%

The change in the (benefit from) provision for income taxes was primarily due to a discrete tax benefit of $9.3 million recorded during the nine months ended September 30, 2020 associated with the enactment of the CARES Act, partially offset by a discrete benefit of $7.1 million recorded during the nine months ended September 30, 2021 associated with a change in estimate of our prior year taxable net operating loss that is able to be carried back as part of the CARES Act. The change in the (benefit from) provision for income taxes was also impacted by changes in the jurisdictional mix of earnings period over period.

Liquidity and Capital Resources

Our principal sources of liquidity have been and continue to be our cash and cash equivalents and cash flows from operations. The following tables set forth our cash and cash equivalents and working capital as of September 30, 2021 and December 31, 2020 and our cash flows for the nine months ended September 30, 2021 and 2020:

	September 30, 2021		December 31, 2020
	(in thousands)
Consolidated Balance Sheet Data:
Cash and cash equivalents	$	156,460	$	157,455
Working capital		269,110		251,573

34

	Nine Months Ended September 30,
	2021			2020
	(in thousands)
Consolidated Cash Flow Data:
Net cash provided by operating activities	$	15,197		$	51,644
Net cash used in investing activities		(4,404	)		(4,102	)
Net cash used in financing activities		(11,905	)		(5,767	)

As of September 30, 2021, we had cash, cash equivalents and restricted cash of $157.5 million and net accounts receivable of $80.9 million. We maintain a $25.0 million revolving credit facility, under which we have drawn $6.5 million and utilized $1.5 million of available credit, which we used as collateral for two stand-by letters of credit, leaving $17.0 million of available credit as of September 30, 2021.

Cash Flows

Operating Activities

Our primary source of cash from operating activities has been cash collections from our customers. We expect cash flows from operating activities to be affected by increases and decreases in sales volumes and timing of collections, and by purchases and shipments of inventory. Our primary uses of cash from operating activities have been for personnel costs and investment in our selling, general and administrative departments and research and development. Future cash outflows from operating activities may increase as a result of further investment in research and development and selling, general and administrative requirements, and increases in personnel costs as we continue to grow our business by enhancing our existing products and introducing new products.

During the nine months ended September 30, 2021, cash provided by operating activities was $15.2 million, primarily resulting from our net income of $1.7 million, net non-cash adjustments of $21.9 million and net cash used by changes in our operating assets and liabilities of $8.4 million. The net cash used by changes in our operating assets and liabilities during the nine months ended September 30, 2021 was primarily due to a $17.6 million decrease in accounts payable due to timing of vendor payments; a $6.1 million decrease in accrued expenses; a $5.9 million increase in prepaid income taxes; a $1.6 million increase in prepaid expenses and other assets; and a $1.6 million decrease in accrued income taxes. These uses were partially offset by a $13.2 million decrease in accounts receivable due to collections during the period; a $9.3 million net decrease in inventory; and a $1.9 million increase in deferred revenue due to the timing of revenue recognition.

Investing Activities

Our investing activities have consisted primarily of expenditures for lab and computer equipment and software to support the development of new products. In addition, our investing activities include expansion of and improvements to our facilities. As our business expands, we expect that we will continue to invest in these areas.

Net cash used in investing activities during the nine months ended September 30, 2021 was $4.4 million, consisting of purchases of property and equipment and software licenses.

Financing Activities

Net cash used in financing activities during the nine months ended September 30, 2021 was $11.9 million, consisting primarily of debt principal repayments of $9.0 million and employee taxes paid related to net share settlement of equity awards of $6.3 million, primarily due to PSUs that vested during the nine months ended September 30, 2021. These payments were partially offset by proceeds from the exercise of stock options of $3.5 million.

Commercial Mortgage Loan

In July 2015, we entered into an $8.0 million commercial mortgage loan agreement, which matured on July 1, 2020. On July 1, 2020, we paid in full the remaining $6.5 million in unpaid principal and accrued interest under the mortgage loan with funds drawn upon our revolving credit facility. The annual interest rate on the loan was 3.5%, and the loan was repayable in 60 monthly installments of principal and interest based on a 20-year amortization schedule.

35

Term Loan and Revolving Credit Facilities

On December 20, 2016, we entered into a credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, various lenders and JPMorgan Chase Bank, N.A. and Barclays Bank PLC, as joint lead arrangers and joint bookrunners, providing for:

• a term loan facility of $300.0 million; and

• a revolving credit facility of up to $25.0 million in revolving credit loans and letters of credit.

As of September 30, 2021 and December 31, 2020, we had borrowings of $279.0 million and $288.0 million, respectively, outstanding under the term loan facility.  As of September 30, 2021 and December 31, 2020 we had borrowings of $6.5 million under the revolving credit facility, which were drawn down to fund the repayment of our commercial mortgage loan. However, on October 25, 2021, we repaid the full balance of outstanding borrowings under the revolving credit facility with cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2021. As of September 30, 2021 and December 31, 2020, we had also used $1.5 million of available credit under the revolving credit facility for two stand-by letters of credit, one which serves as collateral to one of our customers pursuant to a contractual obligation and one which is used as collateral for operating leases in Australia. In addition, we may, subject to certain conditions, including the consent of the administrative agent and the institutions providing such increases, increase the facilities by an unlimited amount so long as we are in compliance with specified leverage ratios, or otherwise by up to $70.0 million.

Borrowings under the facilities bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at our option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the term loan facility is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans and 0.75% per annum for base rate loans, subject to reduction based on our maintaining specified net leverage ratios. The interest rates payable under the facilities are subject to an increase of 2.00% per annum during the continuance of any payment default.

For Eurodollar rate loans, we may select interest periods of one, three or six months or, with the consent of all relevant affected lenders, twelve months. Interest will be payable at the end of the selected interest period, but no less frequently than every three months within the selected interest period. Interest on any base rate loan is not set for any specified period and is payable quarterly. We have the right to convert Eurodollar rate loans into base rate loans and the right to convert base rate loans into Eurodollar rate loans at our option, subject, in the case of Eurodollar rate loans, to breakage costs if the conversion is effected prior to the end of the applicable interest period. As of September 30, 2021 and December 31, 2020, the interest rate on the term loans was 5.00% per annum, which was based on a three-month and six-month Eurodollar rate, respectively, at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans. As of September 30, 2021, the interest rate on the revolving credit facility was 1.83% per annum, which was based on a one-month Eurodollar rate of 0.08% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans. As of December 31, 2020, the interest rate on the revolving credit facility was 2.12% per annum, which was based on the six-month Eurodollar rate of 0.37% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans.

The revolving credit facility also requires payment of quarterly commitment fees at a rate of 0.25% per annum on the difference between committed amounts and amounts actually borrowed under the facility and customary letter of credit fees.

The term loan matures on December 20, 2023 and the revolving credit facility matures on December 20, 2021. The term loan facility is subject to amortization in equal quarterly installments, which commenced on March 31, 2017, of principal in an annual aggregate amount equal to 1.0% of the original principal amount of the term loans of $300.0 million, with the remaining outstanding balance payable at the date of maturity.

Voluntary prepayments of principal amounts outstanding under the term loan facility are permitted at any time; however, if a prepayment of principal is made with respect to a Eurodollar loan on a date other than the last day of the applicable interest period, we are required to compensate the lenders for any funding losses and expenses incurred as a result of the prepayment. Prior to the revolving credit facility maturity date, funds borrowed under the revolving credit facility may be borrowed, repaid and reborrowed, without premium or penalty.

In addition, we are required to make mandatory prepayments under the facilities with respect to (i) 100% of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by us or certain of our subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100% of the net cash proceeds from the issuance or incurrence of any additional debt by us or certain of our subsidiaries, subject to certain exceptions, and (iii) 50% of our excess cash flow, as defined in the credit agreement, subject to reduction upon our achievement of specified performance targets. In accordance with these provisions, a mandatory prepayment of $6.8 million was paid on April 2, 2021.

36

The facilities are secured by, among other things, a first priority security interest, subject to permitted liens, in substantially all of our assets and all of the assets of certain of our subsidiaries and a pledge of certain of the stock of certain of our subsidiaries, in each case subject to specified exceptions. The facilities contain customary affirmative and negative covenants, including certain restrictions on our ability to pay dividends, and, with respect only to the revolving credit facility, a financial covenant requiring us to maintain a specified total net leverage ratio, in the event that on the last day of any fiscal quarter, we have utilized more than 30% of our borrowing capacity under the revolving credit facility (subject to certain exceptions). The term loan facility contains a cross-default provision, whereby, if repayment of borrowings under the revolving credit facility are accelerated due to a default of the net leverage ratio covenant, repayment of the outstanding term loan balance could also be accelerated. Because the financial covenant under the revolving credit facility only applies if outstanding utilization thereunder exceeds 30% of the total borrowing capacity on the last day of each fiscal quarter, this cross-default provision has the effect of limiting our ability to utilize more than 30% of our total borrowing capacity under the revolving credit facility of $25.0 million if both our net leverage ratio exceeds the maximum permitted by the agreement and we would not otherwise be able to reduce our outstanding utilization of the revolving credit facility to below the 30% testing threshold prior to the last day of any quarter. As of September 30, 2021 and December 31, 2020, we were in compliance with all applicable covenants of the facilities. We do not expect to require the use of the revolving credit facility to fund operations during the next 12 months.

Tax Cuts and Jobs Act

Of our total cash and cash equivalents of $156.5 million as of September 30, 2021, $143.6 million was held by our foreign subsidiaries. The Tax Cuts and Jobs Act, or TCJA, established a modified territorial system requiring a mandatory deemed repatriation tax on undistributed earnings of foreign subsidiaries. As of September 30, 2021, we had $25.5 million of undistributed earnings in China that are not indefinitely reinvested. The remaining unremitted earnings of our foreign subsidiaries are either indefinitely reinvested or could be remitted with an immaterial tax cost.

We believe our existing cash and cash equivalents, anticipated cash flows from future operations and liquidity available from our revolving credit facility will be sufficient to meet our working capital and capital expenditure needs and debt service obligations for at least the next 12 months. Our future capital requirements may vary materially from those currently planned and will depend on many factors, including our rate of revenue growth, the timing and extent of spending on research and development efforts and other business initiatives, purchases of capital equipment to support our growth, the expansion of sales and marketing activities, expansion of our business through acquisitions or our investments in complementary products, technologies or businesses, the use of working capital to purchase additional inventory, the timing of new product introductions, market acceptance of our products and overall economic conditions. To the extent that current and anticipated future sources of liquidity are insufficient to fund our future business activities and requirements, we may be required to seek additional equity or debt financing. In the event additional financing is required from outside sources, we may not be able to raise it on terms acceptable to us or at all.

Stock Repurchase Program

On February 21, 2019, we announced a stock repurchase program under which we were authorized to repurchase up to $75.0 million of our common stock. During the nine months ended September 30, 2020, we repurchased approximately 1.2 million shares for a total cost of approximately $3.0 million. During the nine months ended September 30, 2021 we did not repurchase any shares. As of September 30, 2021, approximately $70.2 million remained authorized for repurchases of our common stock under the stock repurchase program. The stock repurchase program has no expiration date and does not require us to purchase a minimum number of shares, and we may suspend, modify or discontinue the stock repurchase program at any time without prior notice.

Contractual Obligations and Commitments

Our material contractual obligations include our term loan facility, revolving credit facility, operating leases and purchase agreements with our contract manufacturers and suppliers.  There have been no material changes to our contractual obligations and commitments from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Critical Accounting Policies and Significant Judgments and Estimates

We prepare our condensed consolidated financial statements in accordance with generally accepted accounting principles in the United States. The preparation of condensed consolidated financial statements also requires us to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, costs and expenses and related

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disclosures. We base our estimates on historical experience and on various other assumptions that we believe to be reasonable under the circumstances. Actual results could differ significantly from the estimates made by our management.

Other than our policies related to stock-based compensation and our adoption of ASU 2020-06, as described in Note 2 of the above notes to the condensed consolidated financial statements, there have been no material changes to our critical accounting policies and estimates from those disclosed in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

Recent Accounting Pronouncements

Refer to the “Summary of Significant Accounting Policies” footnote within our condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q for our analysis of recent accounting pronouncements that are applicable to our business.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

Market risk is the risk of loss to future earnings, values or future cash flows that may result from changes in the price of a financial instrument. The value of a financial instrument may change as a result of changes in interest rates, exchange rates, commodity prices, equity prices and other market changes. We are exposed to market risk related to changes in foreign currency exchange rates and interest rates. We currently mitigate certain foreign currency exchange rate risks with derivative instruments and enter into exchange rate hedging arrangements to manage certain of the risks described below. We do not engage in foreign currency speculation.

Foreign Currency Exchange Risk

We have accounts receivables denominated in foreign currencies, and our operations outside of the United States incur their operating expenses in foreign currencies. To date, the majority of our product sales and inventory purchases have been denominated in U.S. dollars. For our subsidiaries in Ireland and Australia, the U.S. dollar is the functional currency. For each of our other foreign subsidiaries, the functional currency is the local currency. During the nine months ended September 30, 2021 and 2020, we incurred foreign currency transaction (losses) gains of $(1.4) million and $0.7 million, respectively, primarily related to unrealized and realized foreign currency (losses) gains for accounts receivable denominated in foreign currencies and operating expenses that are denominated in local currencies. We recorded these foreign currency transaction (losses) gains as a component of other income (expense), net in our condensed consolidated statements of operations and comprehensive (loss) income. We believe that a 10% change in the exchange rate between either the U.S. dollar and Euro or the U.S. dollar and Australian dollar would not materially impact our operating results or financial position.

Our foreign currency risk management practices are principally intended to mitigate the potential financial impact of changes in the value of transactions and balances denominated in foreign currencies resulting from changes in foreign currency exchange rates. From time to time we enter into cash flow hedges, which utilize foreign currency forward contracts to hedge specific forecasted transactions of our foreign subsidiaries with the goal of protecting our budgeted revenues and expenses against foreign currency exchange rate changes compared to our budgeted rates. During the three and nine months ended September 30, 2020, we settled two cash flow hedges which were used to hedge specific operating cash flows denominated in Australian dollars. No cash flow hedges were settled or outstanding during the three or nine months ended September 30, 2021.

Additionally, from time to time, we enter into other foreign currency forward contracts with the goal of protecting outstanding receivables denominated in currencies other than the U.S. dollar. As of September 30, 2021 we had two currency forward contracts outstanding with notional amounts totaling 1.4 million Euros that will mature in the fourth quarter of 2021 and first quarter of 2022 and we expect to continue to hedge certain significant transactions denominated in currencies other than the U.S. dollar in the future.

The success of our foreign currency risk management program depends upon forecasts of transaction activity denominated in various currencies. To the extent that these forecasts are overstated or understated during periods of currency volatility, we could experience unanticipated foreign currency gains or losses that could have a material impact on our results of operations. Furthermore, our failure to identify new exposures and hedge against them in an effective manner may result in material foreign currency gains or losses.

Interest Rate Sensitivity

Our cash and cash equivalents as of September 30, 2021 and December 31, 2020 consisted of cash maintained in FDIC-insured operating accounts as well as investments in money market mutual funds and certificates of deposit. We also

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have policies requiring that we invest in high-quality issuers, limit our exposure to any individual issuer, and ensure adequate liquidity. Our primary exposure to market risk for our cash equivalents is interest income sensitivity, which is primarily affected by changes in the general level of U.S. interest rates. However, we do not believe a sudden change in the interest rates for our cash equivalents would have a material impact on our financial condition, results of operations or cash flows.

We have a credit agreement that provides us with a term loan facility of $300.0 million and a revolving credit facility of up to $25.0 million in revolving credit loans and letters of credit. Borrowings under the facilities bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at our option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the term loan facility is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans and 0.75% per annum for base rate loans, subject to reduction based on our maintaining of specified net leverage ratios.

As of September 30, 2021, we had borrowings of $279.0 million outstanding under the term loan facility, bearing interest at a rate of 5.00% per annum, which was based on a three-month Eurodollar rate at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans. Changes in interest rates could cause interest charges on our term loan facility to fluctuate. Based on the amount of borrowings outstanding as of September 30, 2021, an increase or decrease of 10% in the Eurodollar rate would have no impact on our earnings and cash flows, as the interest rate in effect at September 30, 2021 on the term loan facility was at the applicable floor of 1.00% per annum and would continue to be in effect with a change of 10%.

On July 1, 2020, we drew down upon our revolving credit facility under our term loan agreement in the amount of $6.5 million. As noted in Note 10, Debt, borrowings under the revolving credit facility mature on December 21, 2021 and the applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans. The interest rate on the outstanding borrowings as of September 30, 2021 was 1.83%, which was based on a one-month Eurodollar rate of 0.08% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans.  An increase or decrease of 10% in the one-month Eurodollar rate would result in a pre-tax change to our earnings and cash flows of less than $0.1 million per year, assuming that such rate was to remain in effect for a year.

Inflation Risk

We do not believe that inflation has had a material effect on our business to date. However, as more fully described in Item 2 above, global demand for the base materials utilized by our suppliers and supply chain risks could result in significant increases in the costs of the components we purchase, and 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, operating results and financial condition.

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Item 4. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a- 15(e) and 15d- 15(e) under the Securities Exchange Act of 1934, as amended, or the Exchange Act), as of the end of the period covered by this Quarterly Report on Form 10-Q. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the Securities and Exchange Commission’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company in the reports that it files or submits under the Exchange Act is accumulated and communicated to our management, including our principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Our management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures. Based on the evaluation of our disclosure controls and procedures as of the end of the period covered by this Quarterly Report on Form 10-Q, our Chief Executive Officer and Chief Financial Officer have concluded that as of such date, our disclosure controls and procedures were effective.

Changes in Internal Control over Financial Reporting

There were no changes in our internal control over financial reporting during our most recently completed fiscal quarter that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II—OTHER INFORMATION

Item 1. Legal Proceedings.

From time to time, we are a party to various litigation matters and subject to claims that arise in the ordinary course of business including, for example, patent infringement lawsuits by non-practicing entities.  In addition, third parties may from time to time assert claims against us in the form of letters and other communications.

On May 29, 2019, John Shen filed a putative shareholder class action complaint in the Massachusetts Superior Court of Essex County, John Shen v. Casa Systems, Inc, et al., Civil Action No. 1977CV00787, against us; certain of our current and former executive officers and directors; Summit Partners, our largest investor; and the underwriters from our December 15, 2017, initial public offering, or IPO. On July 3, 2019, Mirza R. Baig filed a similar putative shareholder class action complaint in the Massachusetts Superior Court of Essex County, Mirza R. Baig v. Casa Systems, Inc., Civil Action No. 1977CV00961, against the same defendants. The two matters were subsequently consolidated and transferred to the Business Litigation Session of the Massachusetts Superior Court, Suffolk County, John Shen v. Casa Systems, Inc, et al., Civil Action No. 19-CV-03203-BLS2 and Mirza R. Baig v. Casa Systems, Inc., Civil Action No. 19-CV-03204-BLS2. The complaints, as later amended on November 12, 2019, purported to be brought on behalf of all purchasers of our common stock in and/or traceable to the IPO. The complaints generally alleged that (i) each of the defendants violated Section 11 and/or Section 12(a)(2) of the Securities Act of 1933, as amended, or the Securities Act, because documents related to the IPO, including our registration statement and prospectus were materially misleading by containing untrue statements of material fact and/or omitting to state material facts necessary to make such statements not misleading and (ii) the individual defendants and Summit Partners acted as controlling persons within the meaning and in violation of Section 15 of the Securities Act. Plaintiffs sought, among other things, compensatory damages, costs and expenses, including counsel and expert fees, rescission or a rescissory measure of damages, and equitable and injunctive relief. On January 12, 2021, the court granted motions to dismiss filed by the defendants.  On February 22, 2021, plaintiffs filed notice of appeal.

On August 9, 2019, Donald Hook filed a putative shareholder class action lawsuit in the Supreme Court of the State of New York, County of New York, Donald Hook, et al., v. Casa Systems, Inc. et al., Index No. 654548/2019, against the same defendants named in the Shen and Baig matters. The complaint, as later amended on November 22, 2019, purports to be brought on behalf of all purchasers of our common stock in and/or traceable to our IPO and generally alleges that (i) each of the defendants violated Section 11 and/or Section 12(a)(2) of the Securities Act because documents related to our IPO including our registration statement and prospectus were materially misleading by containing untrue statements of material fact and/or omitting to state material facts necessary to make such statements not misleading and (ii) the individual defendants and Summit Partners acted as controlling persons within the meaning and in violation of Section 15 of the Securities Act. Plaintiff sought, among other things, compensatory damages, costs and expenses, including counsel and expert fees, rescission or a rescissory measure of damages, disgorgement, and equitable and injunctive relief. On August 30, 2021, the court granted motions to dismiss filed by the defendants.  On September 30, 2021, plaintiff filed notice of appeal.

On August 13, 2019, Panther Partners, Inc. filed a putative shareholder class action lawsuit in the Supreme Court of the State of New York, New York County, Panther Partners, Inc., et al., v. Jerry Guo et al., Index No 654585/2019, against us, certain of our current and former executive officers and directors, and the underwriters from our April 30, 2018 follow-on offering of common stock, which we refer to as our “Follow-on Offering.” The complaint, as later amended on November 22, 2019, purports to be brought on behalf of all purchasers of our common stock in our Follow-on Offering and generally alleges that (i) each of the defendants, other than Abraham Pucheril, violated Section 11 of the Securities Act, and each of the defendants violated Section 12(a)(2) of the Securities Act, because documents related to our Follow-on Offering, including our registration statement and prospectus, were materially misleading by containing untrue statements of material fact and/or omitting to state material facts necessary to make such statements not misleading and (ii) the individual defendants acted as controlling persons within the meaning and in violation of Section 15 of the Securities Act. Plaintiff sought, among other things, compensatory damages, costs and expenses, including counsel and expert fees, rescission or a rescissory measure of damages, and equitable and injunctive relief. On October 4, 2021, the court granted motions to dismiss filed by the defendants.

No amounts have been accrued for any of the putative class action lawsuits referenced above as of September 30, 2021, as we do not believe the likelihood of a material loss is probable.  Although the ultimate outcome of these matters cannot be predicted with certainty, the resolution of any of these matters could have a material impact on our results of operations in the period in which such matter is resolved.

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Item 1A. Risk Factors.

In addition to the other information set forth in this Quarterly Report on Form 10-Q, you should carefully consider the factors discussed in “Part I, Item 1A Risk Factors” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020, or the 2020 10-K, which could materially affect our business, financial condition or future results. Other than the updated risk factors described below, there have been no material changes from the risk factors previously disclosed in the 2020 10-K.

Risks Related to COVID-19 Pandemic

The coronavirus outbreak could negatively impact our operations and have an adverse effect on our revenues and/or results of operations.

The COVID-19 pandemic presents various risks to us, not all of which we are able to fully evaluate or even to foresee at the current time, and which could have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While we remain fully operational, during the three and nine months ended September 30, 2021, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on our financial results.  In particular, certain of our products utilize components, for which there has been increased global demand.  As a result, throughout 2021, and increasingly during the three months ended September 30, 2021, we began to see shortages of supply that resulted in our inability to fulfill certain customer orders within normal lead times.  This adversely impacted our revenue and operating results for the three and nine months ended September 30, 2021. While we continue to work with our supply chain, contract manufacturers, and customers to minimize the extent of such impacts, we expect the effects of global supply chain issues to continue and cannot predict when such effects will subside.  This may prevent us from being able to fulfill our customers’ orders in a timely manner or at all, which could lead to one or more of our customers cancelling their orders.  At this time, we are neither able to estimate the extent of these impacts nor predict whether our efforts to minimize or contain them will be successful. We intend to continue to monitor our business very closely for any effects of COVID-19 for as long as necessary.

Due to the above circumstances and as described generally in our 2020 Annual Report on Form 10-K, our results of operations for the three and nine months ended September 30, 2021 are not necessarily indicative of the results to be expected in future periods. Management cannot predict the full impact of the COVID-19 pandemic on our sales channels, supply chain, manufacturing and distribution, or on economic conditions generally, including the effects on our current and potential customers, who may curtail spending on investments in current and/or new technologies, delay new equipment evaluations and trials, cancel orders, and possibly delay payments based on liquidity concerns, all of which could have a material impact on our business in the future. Similarly, our supply chain and our contract manufacturers could be affected, which could cause disruptions to our ability to meet customer demand or delivery schedules. For the three and nine months ended September 30, 2021, we did see certain delays in our supply chain that adversely impacted delivery schedules to our customers.  If COVID-19 were to have such effects in the future, there would likely be a material adverse impact on our financial results, liquidity and capital resource needs. This uncertainty makes it challenging for management to estimate the future performance of our business, particularly in the near to medium term and the impact of COVID-19 could have a material adverse impact on our results of operations in the near to medium term.

The coronavirus outbreak has resulted in an increase in demand for certain of our solutions, which may subside or decrease when the pandemic ends.

The pandemic and resulting lockdowns have resulted in an increase in demand for residential broadband services, which has in turn led to an increase in demand for certain of our solutions, including our fiber extension home network connection devices and our Fixed Wireless Access CPE devices. We also saw a shift in demand from our cable customers toward more I-CCAP chassis each quarter. That increase in demand contributed to our strong revenue performance in 2020 and has continued into 2021. We cannot guarantee that the heightened demand for residential broadband services will continue for the duration of the pandemic or after the pandemic ends. We similarly cannot guarantee that even to the extent the heightened demand for residential broadband services continues that we will continue to see heightened demand for our solutions. A decrease in demand for our solutions could have a material adverse impact on our revenue and results of operations.

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

Use of Proceeds

On December 14, 2017, the Securities and Exchange Commission, or the SEC, declared our registration statement on Form S-1 (File No. 333-221658) for our initial public offering, or IPO, effective. The net offering proceeds to us from the IPO, after deducting underwriting discounts of $6.3 million and offering expenses payable by us totaling $4.1 million, were approximately $79.3 million. No offering discounts, commissions or expenses were paid directly or indirectly to any of our directors or officers (or their associates) or persons owning 10.0% or more of any class of our equity securities or to any other affiliates. There has been no material change in the planned use of proceeds from our IPO as described in our final prospectus filed with the SEC on December 15, 2017 pursuant to Rule 424(b)(4). As of September 30, 2021, we had not used any of the net offering proceeds and we have invested the proceeds into an investment portfolio with the primary objective of preserving principal and providing liquidity without significantly increasing risk.

Stock Repurchase Program

The following table sets forth information with respect to repurchases of shares of our common stock during the three-month period ended September 30, 2021:

Casa Systems, Inc. Purchase of Equity Securities

Period	Total Number of Shares Purchased		Average Price Paid per Share (1)		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs (2)		Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs
	(In thousands)				(In thousands)		(In thousands)
July 1 - July 31, 2021		—	$	—		—	$	70,208
August 1 - August 31, 2021		—	$	—		—	$	70,208
September 1 - September 30, 2021		—	$	—		—	$	70,208

(1) The calculation of average price included above excludes the cost of commissions.

(2) On February 21, 2019, we announced that our board of directors authorized the repurchase of up to $75.0 million of our common stock under a stock repurchase program. From inception through September 30, 2021, we repurchased approximately 1.7 million shares under the program. The stock repurchase program has no expiration date and does not require us to purchase a minimum number of shares. We may suspend, modify or discontinue the stock repurchase program at any time without prior notice.

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Item 6. Exhibits.

Exhibit Index

Exhibit Number	Description
3.1	Restated Certificate of Incorporation of the Registrant (incorporated by reference to Exhibit 3.1 to the Registrant’s Current Report on Form 8-K (File No. 001-38324) filed on December 19, 2017)
3.2	By-laws of the Registrant (incorporated by reference to Exhibit 3.2 to the Registrant’s Current Report on Form 8-K (File No. 001-38324) filed on December 19, 2017)
31.1*	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2*	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1*	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2*	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101.INS	Inline 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
101.SCH	Inline XBRL Taxonomy Extension Schema Document
101.CAL	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104	Cover Page Interactive Data File (formatted as inline XBRL with applicable taxonomy extension information contained in Exhibits 101)

* Furnished herewith.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	CASA SYSTEMS, INC.
Date: November 2, 2021	By:	/s/ Jerry Guo
		Jerry Guo
		President, Chief Executive Officer and Chairman (Principal Executive Officer)
Date: November 2, 2021	By:	/s/ Scott Bruckner
		Scott Bruckner
		Chief Financial Officer (Principal Financial Officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Jerry Guo, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Casa Systems, 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 2, 2021	By:	/s/ Jerry Guo
		Jerry Guo
		President, Chief Executive Officer and Chairman

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Scott Bruckner, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Casa Systems, 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 2, 2021	By:	/s/ Scott Bruckner
		Scott Bruckner
		Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report on Form 10-Q of Casa Systems, Inc. (the “Company”) for the period ended September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Jerry Guo, as President, Chief Executive Officer and Chairman of the Company, hereby certify, as of the date hereof, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

Date: November 2, 2021	By:	/s/ Jerry Guo
		Jerry Guo
		President, Chief Executive Officer and Chairman

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with this Quarterly Report on Form 10-Q of Casa Systems, Inc. (the “Company”) for the period ended September 30, 2021 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Scott Bruckner, as Chief Financial Officer of the Company, hereby certify, as of the date hereof, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that, to my knowledge, the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company at the dates and for the periods indicated.

Date: November 2, 2021	By:	/s/ Scott Bruckner
		Scott Bruckner
		Chief Financial Officer

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2021	Oct. 26, 2021
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2021
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q3
Trading Symbol	CASA
Entity Registrant Name	Casa Systems, Inc.
Entity Central Index Key	0001333835
Current Fiscal Year End Date	--12-31
Document Quarterly Report	true
Document Transition Report	false
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Entity File Number	001-38324
Entity Tax Identification Number	75-3108867
Entity Incorporation, State or Country Code	DE
Entity Address, Address Line One	100 Old River Road
Entity Address, City or Town	Andover
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01810
City Area Code	978
Local Phone Number	688-6706
Entity Common Stock, Shares Outstanding		86,006,357
Title of 12(b) Security	Common Stock, $0.001 par value per share
Security Exchange Name	NASDAQ

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 156,460	$ 157,455
Accounts receivable, net of provision for doubtful accounts of $121 and $58 as of September 30, 2021 and December 31, 2020, respectively	80,863	94,124
Inventory	91,853	101,204
Prepaid expenses and other current assets	4,485	3,864
Prepaid income taxes	19,956	14,087
Total current assets	353,617	370,734
Property and equipment, net	24,647	28,880
Accounts receivable, net of current portion		143
Deferred tax assets	1,704	1,150
Goodwill	50,177	50,177
Intangible assets, net	32,661	35,844
Other assets	7,435	6,038
Total assets	470,241	492,966
Current liabilities:
Accounts payable	22,841	41,203
Accrued expenses and other current liabilities	33,368	39,793
Accrued income taxes	4,020	7,463
Deferred revenue	15,857	15,531
Current portion of long-term debt, net of unamortized debt issuance costs	8,421	15,171
Total current liabilities	84,507	119,161
Accrued income taxes, net of current portion	11,359	9,520
Deferred tax liabilities	6,504	7,282
Deferred revenue, net of current portion	5,072	3,520
Long-term debt, net of current portion and unamortized debt issuance costs	274,672	276,085
Other liabilities, net of current portion	1,582	1,024
Total liabilities	383,696	416,592
Commitments and contingencies (Note 17)
Stockholders’ equity:
Preferred stock, $0.001 par value; 5,000 shares authorized as of September 30, 2021 and December 31, 2020; no shares issued and outstanding as of September 30, 2021 and December 31, 2020
Common stock, $0.001 par value; 500,000 shares authorized; 87,678 and 85,329 shares issued as of September 30, 2021 and December 31, 2020, respectively; 85,956 and 83,607 shares outstanding as of September 30, 2021 and December 31, 2020, respectively	88	85
Treasury stock, at cost; 1,722 shares	(4,826)	(4,826)
Additional paid-in capital	191,399	183,041
Accumulated other comprehensive income	467	337
Accumulated deficit	(100,583)	(102,263)
Total stockholders’ equity	86,545	76,374
Total liabilities and stockholders’ equity	$ 470,241	$ 492,966

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CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Statement Of Financial Position [Abstract]
Provision for doubtful accounts	$ 121	$ 58
Preferred stock, par value	$ 0.001	$ 0.001
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares, outstanding	0	0
Common stock, par value	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	87,678,000	85,329,000
Common stock, shares outstanding	85,956,000	83,607,000
Treasury stock, shares	1,722,000	1,722,000

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE (LOSS) INCOME (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue:
Total revenue	$ 99,219	$ 105,747	$ 296,226	$ 272,720
Cost of revenue:
Total cost of revenue	58,595	53,153	154,047	134,343
Gross profit	40,624	52,594	142,179	138,377
Operating expenses:
Research and development	21,578	21,823	63,479	63,722
Selling, general and administrative	21,029	21,630	64,492	67,731
Total operating expenses	42,607	43,453	127,971	131,453
(Loss) income from operations	(1,983)	9,141	14,208	6,924
Other income (expense):
Interest income	80	170	297	847
Interest expense	(3,969)	(3,771)	(11,886)	(12,706)
(Loss) gain on foreign currency, net	(375)	(6)	(1,353)	674
Other income, net	83	338	634	435
Total other income (expense), net	(4,181)	(3,269)	(12,308)	(10,750)
(Loss) income before (benefit from) provision for income taxes	(6,164)	5,872	1,900	(3,826)
(Benefit from) provision for income taxes	(5,288)	2,399	220	(5,433)
Net (loss) income	(876)	3,473	1,680	1,607
Other comprehensive (loss) income—foreign currency translation adjustment, net of tax	(127)	1,334	130	916
Other comprehensive loss—gain on foreign currency hedge net of tax		(527)
Comprehensive (loss) income	$ (1,003)	$ 4,280	$ 1,810	$ 2,523
Net (loss) income per share attributable to common stockholders:
Basic	$ (0.01)	$ 0.04	$ 0.02	$ 0.02
Diluted	$ (0.01)	$ 0.04	$ 0.02	$ 0.02
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders:
Basic	85,660	83,302	84,985	83,437
Diluted	85,660	85,466	88,948	85,370
Product
Revenue:
Total revenue	$ 87,752	$ 93,741	$ 262,019	$ 239,627
Cost of revenue:
Total cost of revenue	57,372	51,947	150,515	130,602
Service
Revenue:
Total revenue	11,467	12,006	34,207	33,093
Cost of revenue:
Total cost of revenue	$ 1,223	$ 1,206	$ 3,532	$ 3,741

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Accumulated Deficit
Balances at Dec. 31, 2019	$ 38,564	$ 84		$ 169,561	$ (2,222)	$ (127,064)
Balances, shares at Dec. 31, 2019		84,333
Balance Treasury, shares at Dec. 31, 2019			495
Balance Treasury at Dec. 31, 2019			$ (1,795)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	317	$ 1		316
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		912
Foreign currency translation adjustment, net of tax	916				916
Repurchases of treasury shares	(3,031)		$ (3,031)
Repurchases of treasury shares, shares			1,227
Stock-based compensation	9,505			9,505
Net income (loss)	1,607					1,607
Balances at Sep. 30, 2020	47,878	$ 85		179,382	(1,306)	(125,457)
Balances, shares at Sep. 30, 2020		85,245
Balance Treasury, shares at Sep. 30, 2020			1,722
Balance Treasury at Sep. 30, 2020			$ (4,826)
Balances at Jun. 30, 2020	39,712	$ 85		175,496	(2,113)	(128,930)
Balances, shares at Jun. 30, 2020		84,856
Balance Treasury, shares at Jun. 30, 2020			1,722
Balance Treasury at Jun. 30, 2020			$ (4,826)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	390			390
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		389
Cash flow hedges	(527)				(527)
Foreign currency translation adjustment, net of tax	1,334				1,334
Stock-based compensation	3,496			3,496
Net income (loss)	3,473					3,473
Balances at Sep. 30, 2020	47,878	$ 85		179,382	(1,306)	(125,457)
Balances, shares at Sep. 30, 2020		85,245
Balance Treasury, shares at Sep. 30, 2020			1,722
Balance Treasury at Sep. 30, 2020			$ (4,826)
Balances at Dec. 31, 2020	$ 76,374	$ 85		183,041	337	(102,263)
Balances, shares at Dec. 31, 2020		85,329
Balance Treasury, shares at Dec. 31, 2020	1,722		1,722
Balance Treasury at Dec. 31, 2020	$ 4,826		$ (4,826)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	(2,784)	$ 3		(2,787)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		2,349
Foreign currency translation adjustment, net of tax	130				130
Stock-based compensation	11,145			11,145
Net income (loss)	1,680					1,680
Balances at Sep. 30, 2021	$ 86,545	$ 88		191,399	467	(100,583)
Balances, shares at Sep. 30, 2021		87,678
Balance Treasury, shares at Sep. 30, 2021	1,722		1,722
Balance Treasury at Sep. 30, 2021	$ 4,826		$ (4,826)
Balances at Jun. 30, 2021	81,957	$ 87		185,809	594	(99,707)
Balances, shares at Jun. 30, 2021		87,116
Balance Treasury, shares at Jun. 30, 2021			1,722
Balance Treasury at Jun. 30, 2021			$ (4,826)
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes	1,705	$ 1		1,704
Exercise of stock options and common stock issued upon vesting of equity awards, net of shares withheld for employee taxes, shares		562
Foreign currency translation adjustment, net of tax	(127)				(127)
Stock-based compensation	3,886			3,886
Net income (loss)	(876)					(876)
Balances at Sep. 30, 2021	$ 86,545	$ 88		$ 191,399	$ 467	$ (100,583)
Balances, shares at Sep. 30, 2021		87,678
Balance Treasury, shares at Sep. 30, 2021	1,722		1,722
Balance Treasury at Sep. 30, 2021	$ 4,826		$ (4,826)

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020
Cash flows provided by operating activities:
Net income (loss)		$ 1,680	$ 1,607
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		11,986	13,660
Stock-based compensation		11,245	9,498
Deferred income taxes		(1,322)	(1,834)
Increase in provision for doubtful accounts		63	18
Change in provision for excess and obsolete inventory		(98)	1,290
Gain on disposal of assets		29	11
Changes in operating assets and liabilities:
Accounts receivable		13,194	27,537
Inventory		9,302	(6,617)
Prepaid expenses and other assets		(1,648)	3,004
Prepaid income taxes		(5,873)	(9,763)
Accounts payable		(17,553)	13,764
Accrued expenses and other current liabilities		(6,074)	973
Accrued income taxes		(1,601)	2,467
Deferred revenue		1,867	(3,971)
Net cash provided by operating activities		15,197	51,644
Cash flows used in investing activities:
Purchases of property and equipment		(2,979)	(4,102)
Purchases of software licenses		(1,425)
Net cash used in investing activities		(4,404)	(4,102)
Cash flows used in financing activities:
Principal repayments of debt		(9,025)	(8,893)
Borrowings on revolving credit facility			6,500
Proceeds from exercise of stock options		3,532	957
Employee taxes paid related to net share settlement of equity awards		(6,315)	(639)
Payments of dividends and equitable adjustments		(97)	(661)
Repurchases of treasury stock			(3,031)
Net cash used in financing activities		(11,905)	(5,767)
Effect of exchange rate changes on cash and cash equivalents		111	763
Net (decrease) increase in cash, cash equivalents and restricted cash		(1,001)	42,538
Cash, cash equivalents and restricted cash at beginning of period		158,461	114,657
Cash, cash equivalents and restricted cash at end of period	[1]	157,460	157,195
Supplemental disclosures of cash flow information:
Cash paid for interest		12,167	9,226
Cash paid for income taxes		8,288	2,306
Supplemental disclosures of non-cash operating, investing and financing activities:
Purchases of property and equipment included in accounts payable		179	673
Unpaid equitable adjustments included in accrued expenses and other current liabilities		$ 1	$ 85

[1] See Note 2 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash shown in these unaudited condensed consolidated statements of cash flows.

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Nature of Business and Basis of Presentation

9 Months Ended

Sep. 30, 2021

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of Business and Basis of Presentation

1. Nature of Business and Basis of Presentation

Casa Systems, Inc. (the “Company”) was incorporated under the laws of the State of Delaware on February 28, 2003. The Company is a global communications technology company headquartered in Andover, Massachusetts and has wholly owned subsidiaries in China, France, Canada, Ireland, Spain, Colombia, the Netherlands, Hong Kong, Australia, Germany, the United Kingdom and New Zealand.

The Company offers physical, virtual and cloud-native 5G broadband and customer premise networking equipment for public and private high-speed data and multi-service communications networks. The Company’s core and edge broadband technology enables communications service providers and enterprises to cost-effectively and dynamically increase data network speed, add bandwidth capacity and new services, reduce network complexity, and reduce operating and capital expenditures.  

The Company is subject to a number of risks similar to other companies of comparable size and other companies selling and providing services to the communications service provider (“CSP”) industry. These risks include, but are not limited to, the level of capital spending by the CSPs, a lengthy sales cycle, dependence on the development of new products and services, unfavorable economic and market conditions, competition from larger and more established companies, limited management resources, dependence on a limited number of contract manufacturers and suppliers, the rapidly changing nature of the technology used by the CSPs and reliance on resellers and sales agents. Failure by the Company to anticipate or to respond adequately to technological developments in its industry, changes in customer or supplier requirements, changes in regulatory requirements or industry standards, or any significant delays in the development or introduction of products could have a material adverse effect on the Company’s operating results, financial condition and cash flows.

The Company is an “emerging growth company,” as defined in the Jumpstart Our Business Startups Act of 2012 (the “JOBS Act”), and may remain an emerging growth company until the last day of the fiscal year following the fifth anniversary of the Company’s initial public offering, subject to specified conditions.  The JOBS Act provides that an emerging growth company can take advantage of the extended transition period afforded by the JOBS Act for the implementation of new or revised accounting standards. The Company has elected not to “opt out” of such extended transition period, which means that when a standard is issued or revised, and it has different application dates for public or private companies, the Company is required to adopt the new or revised standard at or prior to the time private companies are required to adopt the new or revised standard, provided that the Company continues to be an emerging growth company. The JOBS Act provides that the decision to take advantage of the extended transition period for complying with new or revised accounting standards is irrevocable.

The accompanying condensed consolidated balance sheet as of September 30, 2021, the condensed consolidated statements of operations and comprehensive (loss) income for the three and nine months ended September 30, 2021 and 2020, the condensed consolidated statements of cash flows for the nine months ended September 30, 2021 and 2020 and the condensed consolidated statements of stockholders’ equity for the three and nine months ended September 30, 2021 and 2020 are unaudited. The financial data and other information disclosed in these notes related to the three and nine months ended September 30, 2021 and 2020 are also unaudited. The accompanying condensed consolidated balance sheet as of December 31, 2020 was derived from the Company’s audited consolidated financial statements for the year ended December 31, 2020 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (“SEC”) on February 25, 2021 (the “Annual Report on Form 10-K”). The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) regarding interim financial reporting. Certain information and note disclosures normally included in the consolidated financial statements prepared in accordance with GAAP have been condensed or omitted. Therefore, these condensed consolidated financial statements should be read in conjunction with the consolidated financial statements and notes included in the Annual Report on Form 10-K. There have been no changes to the Company’s accounting policies from those disclosed in the Annual Report on Form 10-K that would have a material impact on the Company’s condensed consolidated financial statements.

The unaudited interim condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the audited annual consolidated financial statements and, in the opinion of management, include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of the financial position, results of operations and cash flows for the interim periods, but are not necessarily indicative of the results of operations and cash flows to be anticipated for the full year ending December 31, 2021 or any future period.

The accompanying condensed consolidated financial statements include the accounts and results of operations of the Company and its wholly-owned subsidiaries. All intercompany transactions and balances have been eliminated in consolidation.

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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

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods.

Significant estimates and judgments relied upon by management in preparing these condensed consolidated financial statements include revenue recognition, provision for doubtful accounts, reserves for excess and obsolete inventory, valuation of inventory and deferred inventory costs, the expensing and capitalization of software-related research and development costs, amortization and depreciation periods, the recoverability of net deferred tax assets, valuations of uncertain tax positions, warranty allowances, the valuation of equity instruments and stock-based compensation expense.

Although the Company regularly reassesses the assumptions underlying these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances existing at the time such estimates are made.

The COVID-19 pandemic presents various risks to the Company, not all of which the Company is able to fully evaluate or even to foresee at the current time, and which could have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While the Company remains fully operational, during the three and nine months ended September 30, 2021, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on the Company’s financial results. In particular, certain of the Company’s products utilize components, for which there has been increased global demand.  As a result, throughout 2021, and increasingly during the three months ended September 30, 2021, the Company began to see shortages of supply that resulted in the Company’s inability to fulfill certain customer orders within normal lead times.  This adversely impacted the Company’s revenue and operating results for the three and nine months ended September 30, 2021. While the Company continues to work with its supply chain, contract manufacturers, and customers to minimize the extent of such impacts, the Company expects the effects of global supply chain issues to continue and cannot predict when such effects will subside.  This may prevent the Company from being able to fulfill its customers’ orders in a timely manner or at all, which could lead to one or more of its customers cancelling their orders.  At this time the Company is neither able to estimate the extent of these impacts nor predict whether its efforts to minimize or contain them will be successful. The Company intends to continue to monitor its business very closely for any effects of COVID-19 for as long as necessary.

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents include all highly liquid investments maturing within three months from the date of purchase. As of September 30, 2021 and December 31, 2020, the Company’s cash and cash equivalents consisted of investments in certificates of deposit and money market mutual funds.

Restricted cash as of September 30, 2021 and December 31, 2020 consisted of a certificate of deposit of $1,000 and $1,006, respectively, pledged as collateral for a stand-by letter of credit required to support a contractual obligation.

The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows:

	September 30, 2021		September 30, 2020
Cash and cash equivalents	$	156,460	$	156,191
Restricted cash included in other assets		1,000		1,004
	$	157,460	$	157,195

Accounts Receivable

Accounts receivable are presented net of a provision for doubtful accounts, which is an estimate of amounts that may not be collectible. Accounts receivable for customer contracts with customary payment terms, which are one year or less, are recorded at invoiced amounts and do not bear interest. The Company may, in limited circumstances, grant payment terms longer than one year.  Payments due beyond 12 months from the balance sheet date are recorded as non-current assets. The Company generally does not require collateral, but the Company may, in certain instances based on its credit assessment, require full or partial prepayment prior to shipment.    

Accounts receivable as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Current portion of accounts receivable, net:
Accounts receivable, net	$	80,719	$	93,480
Accounts receivable, extended payment terms		144		644
		80,863		94,124
Accounts receivable, net of current portion:
Accounts receivable, extended payment terms		—		143
	$	80,863	$	94,267

The Company performs ongoing credit evaluations of its customers and, if necessary, provides a provision for doubtful accounts and expected losses. When assessing and recording its provision for doubtful accounts, the Company evaluates the age of its accounts receivable, current economic trends, creditworthiness of the customer, customer payment history, and other specific customer and transaction information. The Company writes off accounts receivable against the provision when it determines a balance is uncollectible and no longer actively pursues collection of the receivable. Adjustments to the provision for doubtful accounts are recorded as selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income.

As of September 30, 2021 and December 31, 2020, the Company concluded that all amounts due under extended payment terms were collectible and no reserve for credit losses was recorded. During the nine months ended September 30, 2021 and 2020, the Company did not provide a reserve for credit losses and did not write off any uncollectible receivables due under extended payment terms.

Concentration of Risks

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents consist of demand deposits, savings accounts, money market mutual funds, and certificates of deposit with financial institutions, which may exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses related to its cash and cash equivalents and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables:

	Revenue						Revenue
	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Customer A		24	%		13	%		20	%	*
Customer B	*				27	%	*				23	%
Customer C	*			*				11	%	*

	Accounts Receivable, Net
	September 30, 2021			December 31, 2020
Customer A		21	%	*
Customer D	*				17	%

* Less than 10% of total

Certain of the components and subassemblies included in the Company’s products are obtained from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those single or limited source suppliers, the partial or complete loss of certain of these sources could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships.

Stock-Based Compensation

The Company measures stock options and other stock-based awards granted to employees and directors based on the fair value on the date of grant and recognizes compensation expense of those awards, net of estimated forfeitures, over the requisite service period, which is generally the vesting period of the respective award. Generally, the Company issues stock options with only service-based vesting conditions and records the expense for these awards using the straight-line method.

The Company classifies stock-based compensation expense in its consolidated statements of operations and comprehensive (loss) income in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Company recognizes compensation expense for only the portion of awards that are expected to vest. In developing a forfeiture rate estimate, the Company has considered its historical experience to estimate pre-vesting forfeitures for service-based awards. The impact of a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual forfeiture rate is materially different from the Company’s estimate, the Company may be required to record adjustments to stock-based compensation expense in future periods.

The Company estimates the fair value of each stock option grant on the date of grant using the Black-Scholes option pricing model. The Company was a private company until December 14, 2017 and lacks sufficient company-specific historical and implied volatility information for its stock. Therefore, for all options granted in 2020 or before, the Company estimated its expected stock volatility based on the historical volatility of publicly traded peer companies. Beginning with options granted in 2021, the Company estimates its expected stock volatility using a weighted-average calculation based on the historical volatility of the Company and publicly traded peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded stock price. The expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-employees is equal to the contractual term of the option award. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company does not have a history of declaring or paying cash dividends, except for the special cash dividends declared in November 2014, June 2016, December 2016, May 2017 and November 2017, and in those circumstances the board of directors approved cash dividends to be paid to holders of the Company’s stock options, stock appreciation rights (“SARs”) and restricted stock units (“RSUs”) upon vesting as an equitable adjustment to the holders of such instruments.

The Company has also granted SARs to certain employees, which require the Company to pay in cash upon exercise an amount equal to the product of the excess of the per share fair market value of the Company’s common stock on the date of exercise over the exercise price, multiplied by the number of shares of common stock with respect to which the SAR is exercised. Because these awards may require the Company to settle the awards in cash, the Company accounts for them as a liability in the Company’s consolidated balance sheets. The Company recognizes the liability related to these awards, as well as related compensation expense over the period during which services are rendered until completed. As all SARs are now fully vested, the Company continues to remeasure the fair market value of the liability until the award is either exercised or canceled, with changes in the fair value of the liability recorded in the consolidated statements of operations and comprehensive (loss) income.

Impact of Recently Adopted Accounting Standards

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):  Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.  This guidance simplifies the guidance on certain financial instruments with characteristics of liability and equity, including convertible debt instruments.  As a result, entities will not separately present in equity an embedded conversion feature in such debt and will account for a convertible debt instrument wholly as debt, unless certain other conditions are met.  The elimination of these models will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that is within the scope of ASU 2020-06.  The ASU also simplifies the diluted earnings per share calculation in certain areas. The guidance will become effective for fiscal years beginning after December 15, 2021, with early adoption permitted no earlier than fiscal years beginning after December 15, 2020.  The Company has elected to early adopt this ASU and the adoption did not have a material impact on the Company’s condensed consolidated financial statements and the accompanying notes thereto.

Impact of Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842): Amendments to FASB Accounting Standards Codification (“ASU 2016-02”), which replaces the existing guidance for leases.  ASU 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees.  In general, for lease arrangements exceeding a twelve-month term, the arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee.  Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases.  The balance sheet amount recorded for existing leases at the date of adoption of ASU 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption.  This guidance will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for annual reporting periods beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. The Company has begun planning for adoption by implementing a new lease accounting software and by working to establish additional changes to internal processes to comply with all requirements upon adoption.  The standard allows for, and the Company plans on using, a modified retrospective approach with comparatives under ASC 840, where entities would recognize a cumulative effect to retained earnings at the date of adoption without restating prior period balances or disclosure.  Management is continuing to assess the impact of ASU 2016-02 on the Company’s condensed consolidated financial statements and the accompanying notes thereto.  

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). This guidance is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The main provisions include presenting financial assets measured at amortized cost at the amount expected to be collected, which is net of an allowance for expected credit losses, and recording credit losses related to available-for-sale securities through an allowance for credit losses. The effective dates for the amendments in ASU 2016-13 were updated in ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and as such ASU 2016-13 will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for fiscal years beginning after December 15, 2022, including interim periods within those fiscal periods, and must be applied using a modified retrospective approach. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements.

Other

Other than the disclosures above, there have been no changes to the significant accounting policies disclosed in Note 2 “Summary of Significant Accounting Policies” to the Company’s consolidated financial statements included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

3. Goodwill and Intangible Assets

Intangible assets, net consisted of the following at September 30, 2021 and December 31, 2020, respectively:

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(8,037	)	$	16,963
Customer Relationships		18,000		(4,050	)		13,950
Trade Name		1,000		(747	)		253
Purchased software		1,817		(322	)		1,495
Totals as of September 30, 2021	$	45,817	$	(13,156	)	$	32,661

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(5,358	)	$	19,642
Customer Relationships		18,000		(2,700	)		15,300
Trade Name		1,000		(498	)		502
Purchased software		432		(32	)		400
Totals as of December 31, 2020	$	44,432	$	(8,588	)	$	35,844

As of September 30, 2021, amortization expense on existing intangible assets for the next five years and beyond is as follows:

Year Ending December 31,
Remainder of 2021	$	1,532
2022		5,958
2023		5,760
2024		5,656
2025		5,651
Thereafter		8,104
	$	32,661

A summary of amortization expense recorded during the three and nine months ended September 30, 2021 and 2020 is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product cost of revenue	$	893	$	893	$	2,679	$	2,679
Research and development		105		—		290		—
Selling, general and administrative		533		533		1,599		1,600
Totals	$	1,531	$	1,426	$	4,568	$	4,279

The Company’s goodwill is the result of its acquisition of NetComm on July 1, 2019 and represents the excess of purchase price over the estimated fair value of net assets acquired. There has been no change to the $50,177 carrying amount of goodwill since December 31, 2020.

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Inventory

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Inventory

4. Inventory

Inventory as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Raw materials	$	49,297	$	50,904
Work in process		—		19
Finished goods:
Manufactured finished goods		41,730		49,764
Deferred inventory costs		826		517
	$	91,853	$	101,204

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Property and Equipment

9 Months Ended

Sep. 30, 2021

Property Plant And Equipment [Abstract]

Property and Equipment

5. Property and Equipment

Property and equipment as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021			December 31, 2020
Computers and purchased software	$	25,284		$	24,865
Leasehold improvements		4,185			4,148
Furniture and fixtures		2,670			2,644
Machinery and equipment		37,427			36,701
Land		3,091			3,091
Building		4,765			4,765
Building improvements		7,282			7,244
Trial systems at customers’ sites		4,232			5,300
		88,936			88,758
Less: Accumulated depreciation and amortization		(64,289	)		(59,878	)
	$	24,647		$	28,880

During the nine months ended September 30, 2021 and 2020, the Company transferred trial systems into inventory from property and equipment with values of $1,145 and $690, respectively, net of transfers of trial systems to cost of revenue. In addition, the Company transferred $325 and $766 of equipment into inventory from property and equipment during the nine months ended September 30, 2021 and 2020, respectively.

Depreciation and amortization expense on property and equipment totaled $2,258 and $2,968 for the three months ended September 30, 2021 and 2020, respectively, and $7,418 and $9,370 for the nine months ended September 30, 2021 and 2020, respectively.

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Accrued Expenses and Other Current Liabilities

9 Months Ended

Sep. 30, 2021

Payables And Accruals [Abstract]

Accrued Expenses and Other Current Liabilities

6. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Accrued compensation and related taxes	$	16,919	$	22,785
Inventory-related accruals		4,619		855
Accrued warranty		2,483		2,354
Other accrued expenses		9,347		13,799
	$	33,368	$	39,793

Accrued Warranty

Substantially all of the Company’s products are covered by warranties for software and hardware for periods ranging from 90 days to one year. In addition, in conjunction with customers’ renewals of maintenance and support contracts, the Company offers an extended warranty for periods typically of one to three years for agreed-upon fees. In the event of a failure of a hardware product or software covered by these warranties, the Company must repair or replace the software or hardware or, if those remedies are insufficient, and at the discretion of the Company, provide a refund. The Company’s warranty reserve, which is included in accrued expenses and other current liabilities in the condensed consolidated balance sheets, reflects estimated material, labor and other costs related to potential or actual software and hardware warranty claims for which the Company expects to incur an obligation. The Company’s estimates of anticipated rates of warranty claims and the costs associated therewith are primarily based on historical information and future forecasts. The Company periodically assesses the adequacy of the warranty reserve and adjusts the amount as necessary. If the historical data used to calculate the adequacy of the warranty reserve are not indicative of future requirements, additional or reduced warranty reserves may be required.

A summary of changes in the amount reserved for warranty costs for the nine months ended September 30, 2021 and 2020 is as follows:

	Nine Months Ended September 30,
	2021			2020
Warranty reserve at beginning of period	$	2,354		$	2,448
Provisions		2,015			2,054
Charges		(1,886	)		(2,103	)
Warranty reserve at end of period	$	2,483		$	2,399

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Fair Value Measurements

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurements

7. Fair Value Measurements

The following tables present information about the fair value of the Company’s financial assets and liabilities as of September 30, 2021 and December 31, 2020 and indicate the level of the fair value hierarchy utilized to determine such fair values:

	Fair Value Measurements as of September 30, 2021 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,000	$	—	$	1,000
Money market mutual funds		127,221		—		—		127,221
Foreign currency forward contracts		—		24		—		24
	$	127,221	$	1,024	$	—	$	128,245
Liabilities:
SARs	$	—	$	—	$	458	$	458
	$	—	$	—	$	458	$	458

	Fair Value Measurements as of December 31, 2020 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,006	$	—	$	1,006
Money market mutual funds		114,404		—		—		114,404
	$	114,404	$	1,006	$	—	$	115,410
Liabilities:
SARs	$	—	$	—	$	493	$	493
	$	—	$	—	$	493	$	493

During the nine months ended September 30, 2021 and 2020, there were no transfers between Level 1, Level 2 and Level 3.

There were no changes to the valuation techniques used to measure asset and liability fair values on a recurring basis during the nine months ended September 30, 2021 from those included in the Company’s consolidated financial statements for the year ended December 31, 2020. The following table provides a summary of changes in the fair values of the Company’s SARs liability, for which fair value is determined by Level 3 inputs:

	Nine Months Ended September 30,
	2021			2020
Fair value at beginning of period	$	493		$	264
Change in fair value		100			(7	)
Exercises		(135	)		—
Fair value at end of period	$	458		$	257

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Derivative Instruments

9 Months Ended

Sep. 30, 2021

Derivative Instruments And Hedging Activities Disclosure [Abstract]

Derivative Instruments

8. Derivative Instruments

The Company has certain international customers that are billed in foreign currencies. To mitigate the volatility related to fluctuations in the foreign exchange rates for accounts receivable denominated in foreign currencies, the Company enters into foreign currency forward contracts. As of September 30, 2021, the Company had foreign currency forward contracts outstanding with notional amounts totaling 1,379 Euros maturing in the fourth quarter of 2021 and the first quarter of 2022.  As of December 31, 2020, no foreign currency forward contracts were outstanding.

The Company’s foreign currency forward contracts described above economically hedged certain risks but were not designated as hedges for financial reporting purposes, and accordingly, all changes in the fair value of the derivative instruments were recorded as unrealized foreign currency transaction gains or losses and were included in the condensed consolidated statements of operations and comprehensive (loss) income as a component of other income (expense). The Company records derivative instruments in the condensed consolidated balance sheet at their fair values. As of September 30, 2021, the Company recorded an asset of $24 relating to outstanding foreign currency forward contracts. As of December 31, 2020 the Company recorded no asset relating to outstanding foreign currency forward contracts.  As of September 30, 2021 and December 31, 2020, the Company recorded no liability relating to outstanding foreign currency forward contracts.

The Company also faces exposure to foreign currency exchange rate fluctuations, as a certain portion of its expenses are denominated in currencies other than U.S. dollars. In certain instances, the Company utilizes forward contracts to hedge against foreign currency fluctuations. These contracts are used to minimize foreign gains or losses, as the gains or losses on the derivative are intended to offset the losses or gains on the underlying exposure. The Company does not engage in foreign currency speculation.

The Company designed its foreign currency risk management strategy principally to mitigate the potential financial impact of changes in the value of transactions and balances denominated in foreign currencies resulting from changes in foreign currency exchange rates. The Company may enter into cash flow hedges that utilize foreign currency forward contracts to hedge specific forecasted transactions of its foreign subsidiaries with the goal of protecting its budgeted expenses against foreign currency exchange rate changes compared to its budgeted rates.

During the three months ended September 30, 2020, the Company settled one cash flow hedge with a notional amount of 5,000 AUD to hedge certain Australian dollar cash flows incurred during the period. The amount of gain reclassified from other comprehensive (loss) income for the three months ended September 30, 2020 was $527. The full amount of the fair value of the derivatives on the settlement date of $725 was recognized as $57 cost of goods sold, $353 research and development expense and $315 selling, general and administrative expense in the condensed consolidated statement of comprehensive (loss) income for the three months ended September 30, 2020.

During the nine months ended September 30, 2020, the Company settled two cash flow hedges with notional amounts of 8,500 AUD and 5,000 AUD to hedge certain Australian dollar cash flows incurred during the period. The amount of gain reclassified from other comprehensive (loss) income for the nine months ended September 30, 2020 was $752. The full amount of the fair value of the derivatives on the settlement date of $1,613 was recognized as $124 cost of goods sold, $890 research and development expense and $599 selling, general and administrative expense in the condensed consolidated statement of comprehensive (loss) income for the nine months ended September 30, 2020.

The Company did not have any cash flow hedges outstanding as of September 30, 2021 and December 31, 2020.

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Income Taxes

9 Months Ended

Sep. 30, 2021

Income Tax Disclosure [Abstract]

Income Taxes

9. Income Taxes

The Company’s effective income tax rate was 85.8% and 40.9% for the three months ended September 30, 2021 and 2020, respectively. The (benefit from) provision for income taxes was $(5,288) and $2,399 for the three months ended September 30, 2021 and 2020, respectively. The change in the (benefit from) provision for income taxes was primarily due to a discrete benefit of ($7,097) recorded in the three months ended September 30, 2021 related to a change in estimate of the Company’s prior year net operating loss that is able to be carried back as part of the Coronavirus Aid, Relief and Economic Security Act (“CARES Act”). The change in the (benefit from) provision for income taxes was also impacted by changes in the jurisdictional mix of earnings period over period.

The Company’s effective income tax rate was 11.6% and 142.0% for the nine months ended September 30, 2021 and 2020, respectively. The provision for (benefit from) income taxes was $220 and $(5,433) for the nine months ended September 30, 2021 and 2020, respectively. The change in the provision for (benefit from) income taxes was primarily due to a discrete tax benefit of $ (9,310) recorded during the nine months ended September 30, 2020 associated with the enactment of the CARES Act, partially offset by a discrete benefit of ($7,097) recorded during the nine months ended September 30, 2021 associated with a change in estimate of the Company’s prior year net operating loss that is able to be carried back as part of the CARES Act. The change in the provision for (benefit from) income taxes was also impacted by changes in the jurisdictional mix of earnings period over period. 

The (benefit from) provision for income taxes for the three and nine months ended September 30, 2021 and 2020 differed from the federal statutory rate primarily due to the geographical mix of earnings and related foreign tax rate differential, permanent differences, research and development tax credits, foreign tax credits, the valuation allowance maintained against certain deferred tax assets and withholding taxes.

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Debt

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Debt

10. Debt

The aggregate principal amount of debt outstanding as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,		December 31,
	2021		2020
Term loan	$	278,975	$	288,000
Revolving credit facility		6,500		6,500
Total principal amount of debt outstanding	$	285,475	$	294,500

Current and non-current debt obligations reflected in the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,			December 31,
	2021			2020
Current liabilities:
Term loan	$	3,000		$	9,775
Revolving credit facility		6,500			6,500
Current portion of principal payment obligations		9,500			16,275
Unamortized debt issuance costs, current portion		(1,079	)		(1,104	)
Current portion of long-term debt, net of    unamortized debt issuance costs	$	8,421		$	15,171
Non-current liabilities:
Term loan	$	275,975		$	278,225
Unamortized debt issuance costs, non-current portion		(1,303	)		(2,140	)
Long-term debt, net of current portion and    unamortized debt issuance costs	$	274,672		$	276,085

As of September 30, 2021, aggregate minimum future principal payments of the Company’s debt are summarized as follows:

Year Ending December 31,
Remainder of 2021	$	7,250
2022		3,000
2023		275,225
Thereafter		—
	$	285,475

Term Loan and Revolving Credit Facilities

On December 20, 2016, the Company entered into a credit agreement with JPMorgan Chase Bank, N.A., as administrative agent, various lenders and JPMorgan Chase Bank, N.A. and Barclays Bank PLC providing for (i) a term loan facility of $300,000 and (ii) a revolving credit facility of up to $25,000 in revolving credit loans and letters of credit.

As of September 30, 2021 and December 31, 2020, $278,975 and $288,000 in principal amount, respectively, were outstanding under the term loan facility (the “Term Loan”).  As of September 30, 2021 and December 31, 2020, the Company had outstanding borrowings under the revolving credit facility of $6,500, which were repaid in full on October 25, 2021 using cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2021. See Note 18, Subsequent Events below for further discussion. As of September 30, 2021 and December 31, 2020, the Company had also used $1,450 and $1,454 of available credit under the revolving credit facility for two stand-by letters of credit, one which serves as collateral to one of the Company’s customers pursuant to a contractual performance guarantee and one which serves as collateral for operating leases in Australia. In addition, the Company may, subject to certain conditions, including the consent of the administrative agent and the institutions providing such increases, increase the facilities by an unlimited amount so long as the Company is in compliance with specified leverage ratios, or otherwise by up to $70,000.

Borrowings under the facilities bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at the Company’s option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the term loan facility is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans and 0.75% per annum for base rate loans, subject to reduction based on the Company’s maintaining specified net leverage ratios. The interest rates payable under the facilities are subject to an increase of 2.00% per annum during the continuance of any payment default.

For Eurodollar rate loans, the Company may select interest periods of one, three or six months or, with the consent of all relevant affected lenders, twelve months. Interest will be payable at the end of the selected interest period, but no less frequently than every three months within the selected interest period. Interest on any base rate loan is not set for any specified period and is payable quarterly. The Company has the right to convert Eurodollar rate loans into base rate loans and the right to convert base rate loans into Eurodollar rate loans at its option, subject, in the case of Eurodollar rate loans, to breakage costs if the conversion is effected prior to the end of the applicable interest period. As of September 30, 2021 and December 31, 2020, the interest rate on the Term Loans was 5.00% per annum, which was based on a one-month and six-month Eurodollar rate, respectively, at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans. As of September 30, 2021, the interest rate on the revolving credit facility was 1.83% per annum, which was based on a one-month Eurodollar rate of 0.08% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans. As of December 31, 2020, the interest rate on the revolving credit facility was 2.12% per annum, which was based on the six-month Eurodollar rate of 0.37% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans.

Upon entering into the term loan facility, the Company incurred debt issuance costs of $7,811, which were initially recorded as a reduction of the debt liability and are amortized to interest expense using the effective interest method from the issuance date of the Term Loan until the maturity date. The Company made principal payments of $750 during each of the three months ended September 30, 2021 and 2020, and $9,025 and $2,250 during the nine months ended September 30, 2021 and 2020, respectively, under the term loan facility. No principal payments were made under the revolving credit facility during the three and nine months ended September 30, 2021 and 2020. Interest expense for the Term Loan and revolving credit facility, including the amortization of debt issuance costs, totaled $3,870 and $3,892 for the three months ended September 30, 2021 and 2020, respectively, and totaled $11,672 and $12,366 for the nine months ended September 30, 2021 and 2020, respectively.

The revolving credit facility also requires payment of quarterly commitment fees at a rate of 0.25% per annum on the difference between committed amounts and amounts actually borrowed under the facility and customary letter of credit fees. For each of the three months ended September 30, 2021 and 2020, interest expense related to the fee for the unused amount of the revolving credit facility totaled $11 and for the nine months ended September 30, 2021 and 2020, interest expense related to the fee for the unused amount of the revolving credit facility totaled $33 and $41, respectively.

The Term Loan matures on December 20, 2023, and the revolving credit facility matures on December 20, 2021. The Term Loans are subject to amortization in equal quarterly installments, which commenced on March 31, 2017, of principal in an annual aggregate amount equal to 1.0% of the original principal amount of the Term Loans of $300,000, with the remaining outstanding balance payable at the date of maturity.

Voluntary prepayments of principal amounts outstanding under the term loan facility are permitted at any time; however, if a prepayment of principal is made with respect to a Eurodollar loan on a date other than the last day of the applicable interest period, the Company is required to compensate the lenders for any funding losses and expenses incurred as a result of the prepayment. Prior to the revolving credit facility maturity date, funds borrowed under the revolving credit facility may be borrowed, repaid and reborrowed, without premium or penalty.

In addition, the Company is required to make mandatory prepayments under the facilities with respect to (i) 100% of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by the Company or certain of its subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100% of the net cash proceeds from the issuance or incurrence of any additional debt by the Company or certain of its subsidiaries, subject to certain exceptions, and (iii) 50% of the Company’s excess cash flow, as defined in the credit agreement, subject to reduction upon its achievement of specified performance targets. In accordance with these provisions, a mandatory early prepayment of $6,775 was paid by the Company on April 2, 2021.  This amount was included in the current portion of long-term debt, net of unamortized debt issuance costs on the condensed consolidated balance sheet as of December 31, 2020.

The facilities are secured by, among other things, a first priority security interest, subject to permitted liens, in substantially all of the Company’s assets and all of the assets of certain of its subsidiaries and a pledge of certain of the stock of certain of its subsidiaries, in each case subject to specified exceptions. The facilities contain customary affirmative and negative covenants, including certain restrictions on the Company’s ability to pay dividends, and with respect to the revolving credit facility, a financial covenant requiring the Company to maintain a specified total net leverage ratio in the event that on the last day of any fiscal quarter the Company has utilized more than 30% of its borrowing capacity under the facility. The Company was in compliance with all covenants as of September 30, 2021 and December 31, 2020.

Commercial Mortgage Loan

On July 1, 2015, the Company entered into a commercial mortgage loan agreement in the amount of $7,950 (the “Mortgage Loan”). Borrowings under the Mortgage Loan bore interest at a rate of 3.5% per annum and were repayable in 60 monthly installments of $46, consisting of principal and interest based on a 20-year amortization schedule. The remaining amount of unpaid principal under the Mortgage Loan was paid on the maturity date of July 1, 2020 utilizing the Company’s revolving credit facility. Upon entering into the Mortgage Loan, the Company incurred debt issuance cost of $45, which was initially recorded as a direct deduction from the debt liability and was amortized to interest expense using the effective interest method from the issuance date of the loan until the maturity date.

The Mortgage Loan was paid on the maturity date of July 1, 2020, utilizing the Company’s revolving credit facility.  The Company made principal payments under the Mortgage Loan of $6,483 and $6,643 during the three and nine months ended September 30, 2020, respectively. No interest expense was incurred during the three months ended September 30, 2020.  Interest expense, including the amortization of debt issuance costs, totaled $120 during the nine months ended September 30, 2020.

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Stockholders' Equity

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Stockholders' Equity

11. Stockholders’ Equity 

In connection with special dividends previously declared, the board of directors also approved cash payments to be made to holders of the Company’s stock options, SARs and RSUs as equitable adjustments to the holders of such instruments in accordance with the provisions of the Company’s equity incentive plans. These equitable adjustment payments are equal to

an amount per share multiplied by the net number of shares subject to outstanding equity awards after applying the treasury stock method. The below table provides details of these equitable adjustment payments:

				Equitable Adjustment Payments
				Nine Months Ended				Equitable Adjustment Liability(1)
Dividend Declaration Dates	Equitable Adjustment per share		Year of Final Vesting	September 30, 2021		September 30, 2020		As of September 30, 2021		As of December 31, 2020
November 30, 2017	$	0.5802	2021	$	42	$	136	$	1	$	30
May 10, 2017		1.1774	2021		53		176		—		31
December 27, 2016		2.3306	2020		2		295		—		2
June 17, 2016		0.5891	2020		—		54		—		—
Total				$	97	$	661	$	1	$	63

(1) Net of estimated forfeitures. Actual payouts may vary based on actual forfeitures. Amounts are included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets.

Stock Repurchase Program

On February 21, 2019, the Company announced a stock repurchase program authorizing it to repurchase up to $75,000 of the Company’s common stock. There were no repurchases made during the three and nine months ended September 30, 2021.  There were no repurchases during the three months ended September 30, 2020.  During the nine months ended September 30, 2020, the Company repurchased 1,227 shares, at a cost of $3,031, including commissions. As of September 30, 2021, $70,208 remained authorized for repurchases of the Company’s common stock under the stock repurchase program. The stock repurchase program has no expiration date and does not require the Company to purchase a minimum number of shares, and the Company may suspend, modify or discontinue the stock repurchase program at any time without prior notice.

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Stock-based Compensation

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Stock-based Compensation

12. Stock-based Compensation

2017 Stock Incentive Plan

The Company’s 2017 Stock Incentive Plan (the “2017 Plan”) provides for the Company to sell or issue common stock or restricted common stock, or to grant qualified incentive stock options, nonqualified stock options, SARs, performance-based restricted stock units (“PSUs”), RSUs or other stock-based awards to the Company’s employees, officers, directors, advisors and outside consultants. The total number of shares authorized for issuance under the 2017 Plan was 20,617 shares as of September 30, 2021, of which 9,755 shares remained available for future grant.

Stock Options

The following table summarizes the outstanding stock option activity and a summary of information related to stock options as of and for the nine months ended September 30, 2021:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)
Outstanding at January 1, 2021		7,120		$	8.01		4.88	$	9,367
Granted		116			8.23
Exercised		(904	)		2.26
Forfeited		(292	)		10.70
Outstanding at September 30, 2021		6,040		$	8.74		4.53	$	7,200
Options exercisable at September 30, 2021		5,665		$	8.69		4.28	$	6,924
Vested or expected to vest at September 30, 2021		6,032		$	8.74		4.52	$	7,182

The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
Risk-free interest rate	1.0%	0.4%	1.0%	0.4%-0.7%
Expected term (in years)	6.1	6.1	6.1	6.1
Expected volatility	38.6%	31.8%	38.2%-38.6%	29.3%-31.8%
Expected dividend yield	0.0%	0.0%	0.0%	0.0%

The weighted-average grant-date fair value of options granted during the nine months ended September 30, 2021 and 2020 was $3.15 and $0.98 per share, respectively. Cash proceeds received upon the exercise of options were $3,532 and $955 during the nine months ended September 30, 2021 and 2020, respectively. The intrinsic value of stock options exercised during the nine months ended September 30, 2021 and 2020 was $5,182 and $1,480, respectively. The aggregate intrinsic value is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the Company’s common stock.

Restricted Stock Units

A summary of RSU activity under the Company’s 2011 Stock Incentive Plan (the “2011 Plan”) and the 2017 Plan for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		4,231		$	5.43
Granted		1,660			8.26
Vested		(1,241	)		6.15	$	10,149
Forfeited		(270	)		4.68
Unvested balance at September 30, 2021		4,380		$	6.34

The Company withheld 779 and 150 shares of common stock in settlement of employee tax withholding obligations due upon the vesting of RSUs and PSUs during the nine months ended September 30, 2021 and 2020, respectively.

Performance-Based Stock Units

During the nine months ended September 30, 2021 and 2020, the Company granted PSUs to certain employees that vest over a three-year period based on the achievement of performance goals and continued performance of services.  The performance goals consist solely of market-based vesting conditions, determined by the Company’s level of achievement of pre-established parameters relating to the performance of the Company’s stock price as set by the Board of Directors. Vesting may occur at any time during the three-year period.

Compensation expense is based on the estimated value of the awards on the grant date, and is recognized over the period from the grant date through the expected vest dates of each vesting condition, both of which were estimated based on a Monte Carlo simulation model applying the following key assumptions:

	Nine Months Ended September 30,
	2021	2020
Risk-free interest rate	0.2%	1.2%
Volatility	78.6%	70.0%
Dividend yield	0.0%	0.0%
Cost of equity	12.0%	11.0%

A summary of PSU activity for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		737		$	3.22
Granted		442			7.89
Vested		(737	)		3.22	$	6,449
Forfeited		—			—
Unvested balance at September 30, 2021		442		$	7.89

Stock Appreciation Rights

Over time, the Company has granted SARs that allow the holder the right, upon exercise, to receive in cash the amount of the difference between the fair value of the Company’s common stock at the date of exercise and the price of the underlying common stock at the date of grant of each SAR. The SARs vested over a four-year period from the date of grant and expire ten years from the date of grant. During the nine months ended September 30, 2021, 20 SARs were exercised with a fair value of $6.75 per share. As of September 30, 2021, 200 outstanding and fully vested SARs were exercisable with a weighted-average fair value of $2.29 per SAR. The fair value of the SAR liability as of September 30, 2021 and December 31, 2020 was $458 and $493, respectively (see Note 7), and was included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets.

Stock-Based Compensation Expense

Stock-based compensation expense related to stock options, RSUs, SARs and PSUs for the three and nine months ended September 30, 2021 and 2020 was classified in the condensed consolidated statements of operations and comprehensive (loss) income as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenue	$	29	$	45	$	95	$	115
Research and development expenses		557		592		1,971		1,679
Selling, general and administrative expenses		3,112		2,845		9,179		7,704
Total stock-based compensation	$	3,698	$	3,482	$	11,245	$	9,498

The Company recognized stock-based compensation expense for the three and nine months ended September 30, 2021 and 2020 in the condensed consolidated balance sheet as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021		2020
Change in fair value of SAR Liability	$	(188	)	$	(14	)	$	100	$	(7	)
Recognized as additional paid-in capital		3,886			3,496			11,145		9,505
Total stock-based compensation	$	3,698		$	3,482		$	11,245	$	9,498

As of September 30, 2021, there was $25,442 of unrecognized compensation cost related to outstanding stock options, RSUs, SARs and PSUs, which is expected to be recognized over a weighted-average period of 2.67 years.

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Net (Loss) Income per Share

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Net (Loss) Income per Share

13. Net (Loss) Income per Share

Basic and diluted net (loss) income per share attributable to common stockholders was calculated as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021			2020		2021		2020
Numerator:
Net (loss) income attributable to common    stockholders, basic and diluted	$	(876	)	$	3,473	$	1,680	$	1,607
Denominator:
Weighted-average shares used to compute net   (loss) income per share attributable to common    stockholders, basic		85,660			83,302		84,985		83,437
Dilutive effect of stock options		—			1,125		1,765		1,207
Dilutive effect of restricted stock units		—			1,039		2,198		726
Weighted-average shares used to compute net    (loss) income per share attributable to common    stockholders, diluted		85,660			85,466		88,948		85,370
Net (loss) income per share attributable to common    stockholders:
Basic	$	(0.01	)	$	0.04	$	0.02	$	0.02
Diluted	$	(0.01	)	$	0.04	$	0.02	$	0.02

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the computation of diluted net (loss) income per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Options to purchase common stock		6,040		4,156		3,459		4,156
Unvested restricted stock units		4,380		1,001		723		1,001
Unvested performance-based stock units		442		983		—		983

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Revenue from Contracts with Customers

9 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

Revenue from Contracts with Customers

14. Revenue from Contracts with Customers

Disaggregation of revenue

The Company disaggregates its revenue by product and service in the condensed consolidated statements of operations and comprehensive (loss) income. Performance obligations related to product revenue are recognized at a point in time, while performance obligations related to service revenue are recognized over time. The Company also disaggregates its revenue based on geographic locations of its customers, as determined by the customer’s shipping address, summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
North America:
United States	$	40,671	$	32,036	$	101,534	$	90,825
Canada		11,087		6,428		61,875		15,170
Total North America		51,758		38,464		163,409		105,995
Europe, Middle East and Africa:		6,547		6,047		19,478		27,493
Asia-Pacific:
Australia		24,329		38,889		68,527		86,848
Other		8,832		10,014		24,526		31,884
Total Asia-Pacific		33,161		48,903		93,053		118,732
Latin America		7,753		12,333		20,286		20,500
Total revenue(1)	$	99,219	$	105,747	$	296,226	$	272,720

(1) Other than the United States, Canada and Australia, no individual countries represented 10% or more of the Company’s total revenue for any of the periods presented.

The Company also disaggregates its revenue based on product line summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product revenue:
Wireless	$	43,070	$	26,825	$	116,081	$	62,992
Fixed telco		20,187		34,005		51,209		75,756
Cable		24,495		32,911		94,729		100,879
Total product revenue		87,752		93,741		262,019		239,627
Service revenue:
Wireless		1,141		2,396		3,416		5,244
Fixed telco		825		441		3,474		992
Cable		9,501		9,169		27,317		26,857
Total service revenue		11,467		12,006		34,207		33,093
Total revenue	$	99,219	$	105,747	$	296,226	$	272,720

Costs to Obtain or Fulfill a Contract

As of September 30, 2021 and December 31, 2020, the Company had short-term capitalized contract costs of $96 and $95, respectively, which are included in prepaid expenses and other current assets and had long-term capitalized contract costs of $67 and $70, respectively, which are included in other assets in the accompanying condensed consolidated balance sheets. During the three months ended September 30, 2021 and 2020, amortization expense associated with capitalized contract costs was $23 and $76, respectively, and during the nine months ended September 30, 2021 and 2020 was $75 and $524, respectively, all of which was recorded to selling, general and administrative expenses in the accompanying condensed consolidated statements of operations and comprehensive (loss) income.

Contract Balances

Contract liabilities consist of deferred revenue and include payments received in advance of performance under the contract. Such amounts are recognized as revenue when the Company satisfies its performance obligations, consistent with the above methodology. For the three and nine months ended September 30, 2021, the Company recognized $1,726 and $13,706, respectively, of revenue that was included in deferred revenue as of December 31, 2020.  For the three and nine months ended September 30, 2020, the Company recognized $9,857 and $20,194, respectively, of revenue that was included in deferred revenue as of December 31, 2019.

The Company receives payments from customers based upon contractual billing terms. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include amounts related to the Company’s contractual right to consideration for both completed and partially completed performance obligations that may not have been invoiced. As of September 30, 2021 and December 31, 2020, the Company included contract assets of $781 and $771, respectively, which is netted with deferred revenue in the accompanying condensed consolidated balance sheets.

Transaction price allocated to the remaining performance obligations

As of September 30, 2021, the aggregate remaining amount of revenue expected to be recognized related to unsatisfied or partially unsatisfied performance obligations was $20,929, which consists of deferred revenue. The Company expects approximately 76% of this amount to be recognized in the next twelve months with the remaining amount to be recognized over the next two to five years.

Other Revenue Recognition Policies

The Company’s customary payment terms are generally 90 days or less. If the Company provides extended payment terms that represent a significant financing component, the Company adjusts the amount of promised consideration for the time value of money using an appropriate discount rate and recognizes interest income separate from the revenue recognized on contracts with customers. During the three months ended September 30, 2021 and 2020, the Company recorded interest income of $6 and $10, respectively, and during the nine months ended September 30, 2021 and 2020, the Company recorded interest income of $14 and $57, respectively, all of which were recorded in the condensed consolidated statements of operations and comprehensive (loss) income.  

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Segment Information

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Segment Information

15. Segment Information

The Company operates as one operating segment. Operating segments are defined as components of an enterprise for which separate financial information is regularly evaluated by the Company’s chief operating decision maker, or decision-making group, in deciding how to allocate resources and assess performance. The Company has determined that its chief operating decision maker is its President and Chief Executive Officer. The Company’s chief operating decision maker reviews the Company’s financial information on a consolidated basis for purposes of allocating resources and assessing financial performance. Since the Company operates as one operating segment, all required financial segment information can be found in these condensed consolidated financial statements.

The Company’s property and equipment, net by location was as follows:

	September 30, 2021		December 31, 2020
United States	$	17,431	$	20,988
China		3,144		2,986
Australia		2,236		2,849
Other		1,836		2,057
Total property and equipment, net	$	24,647	$	28,880

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Related Parties

9 Months Ended

Sep. 30, 2021

Related Party Transactions [Abstract]

Related Parties

16. Related Parties

Employment of Rongke Xie

Rongke Xie, who serves as Deputy General Manager of Guangzhou Casa Communication Technology LTD (“Casa China”), a subsidiary of the Company, is the sister of Lucy Xie, the Company’s Senior Vice President of Operations and a member of the Company’s board of directors. Casa China paid Rongke Xie $187 and $153 in total compensation during the nine months ended September 30, 2021 and 2020, respectively, for her services as an employee.

To date, the Company has granted to Rongke Xie 116 RSUs which vest over four annual periods. The grant-date fair value of the awards totaled $500, which is recorded as stock-based compensation expense over the vesting period of the awards. During the three months ended September 30, 2021 and 2020, the Company recognized selling, general and administrative expenses of $28 and $25 related to these awards, and during the nine months ended September 30, 2021 and 2020, the Company recognized selling, general and administrative expenses of $78 and $62 related to these awards.   

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2021

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

17. Commitments and Contingencies

Indemnification

The Company has, in the ordinary course of business, agreed to defend and indemnify certain customers against third-party claims asserting (i) infringement of certain intellectual property rights, which may include patents, copyrights, trademarks or trade secrets, and (ii) certain other harms caused by the acts or omissions of the Company.

As permitted under Delaware law, the Company indemnifies its officers, directors and employees for certain events or occurrences that happen by reason of their relationship with or position held at the Company.

As of September 30, 2021 and December 31, 2020, the Company had not experienced any material losses related to these indemnification obligations and no material claims were outstanding where a contingent loss was considered to be probable or reasonably estimable. The Company does not expect significant claims related to these indemnification obligations and, consequently, concluded that the fair value of these obligations is negligible, and no related liabilities were recorded in its condensed consolidated financial statements.

Litigation

The complete response to this section regarding legal proceedings is incorporated by reference herein to Part II Item I in this 10-Q.

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Subsequent Events

9 Months Ended

Sep. 30, 2021

Subsequent Events [Abstract]

Subsequent Events

18. Subsequent Events

Revolving Credit Facility

On October 25, 2021, the Company repaid all outstanding borrowings under the revolving credit facility utilizing funds held in cash and cash equivalents in the condensed consolidated balance sheets as of September 30, 2021. Repayment of the revolving credit facility included $6,500 of outstanding principal and $7 of outstanding interest on the payoff date. As noted in Note 10, Debt, the full $6,500 outstanding balance was included in current portion of long-term debt, net of unamortized debt issuance costs on the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020.

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Summary of Significant Accounting Policies (Policies)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Use of Estimates

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosures of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting periods.

Significant estimates and judgments relied upon by management in preparing these condensed consolidated financial statements include revenue recognition, provision for doubtful accounts, reserves for excess and obsolete inventory, valuation of inventory and deferred inventory costs, the expensing and capitalization of software-related research and development costs, amortization and depreciation periods, the recoverability of net deferred tax assets, valuations of uncertain tax positions, warranty allowances, the valuation of equity instruments and stock-based compensation expense.

Although the Company regularly reassesses the assumptions underlying these estimates, actual results could differ materially from these estimates. Changes in estimates are recorded in the period in which they become known. The Company bases its estimates on historical experience and various other assumptions that it believes to be reasonable under the circumstances existing at the time such estimates are made.

The COVID-19 pandemic presents various risks to the Company, not all of which the Company is able to fully evaluate or even to foresee at the current time, and which could have a material effect upon the estimates and judgments relied upon by management in preparing these condensed consolidated financial statements. While the Company remains fully operational, during the three and nine months ended September 30, 2021, the effects of the COVID-19 pandemic on the global supply chain had a significant adverse effect on the Company’s financial results. In particular, certain of the Company’s products utilize components, for which there has been increased global demand.  As a result, throughout 2021, and increasingly during the three months ended September 30, 2021, the Company began to see shortages of supply that resulted in the Company’s inability to fulfill certain customer orders within normal lead times.  This adversely impacted the Company’s revenue and operating results for the three and nine months ended September 30, 2021. While the Company continues to work with its supply chain, contract manufacturers, and customers to minimize the extent of such impacts, the Company expects the effects of global supply chain issues to continue and cannot predict when such effects will subside.  This may prevent the Company from being able to fulfill its customers’ orders in a timely manner or at all, which could lead to one or more of its customers cancelling their orders.  At this time the Company is neither able to estimate the extent of these impacts nor predict whether its efforts to minimize or contain them will be successful. The Company intends to continue to monitor its business very closely for any effects of COVID-19 for as long as necessary.

Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

Cash and cash equivalents include all highly liquid investments maturing within three months from the date of purchase. As of September 30, 2021 and December 31, 2020, the Company’s cash and cash equivalents consisted of investments in certificates of deposit and money market mutual funds.

Restricted cash as of September 30, 2021 and December 31, 2020 consisted of a certificate of deposit of $1,000 and $1,006, respectively, pledged as collateral for a stand-by letter of credit required to support a contractual obligation.

The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows:

	September 30, 2021		September 30, 2020
Cash and cash equivalents	$	156,460	$	156,191
Restricted cash included in other assets		1,000		1,004
	$	157,460	$	157,195

Accounts Receivable

Accounts Receivable

Accounts receivable are presented net of a provision for doubtful accounts, which is an estimate of amounts that may not be collectible. Accounts receivable for customer contracts with customary payment terms, which are one year or less, are recorded at invoiced amounts and do not bear interest. The Company may, in limited circumstances, grant payment terms longer than one year.  Payments due beyond 12 months from the balance sheet date are recorded as non-current assets. The Company generally does not require collateral, but the Company may, in certain instances based on its credit assessment, require full or partial prepayment prior to shipment.    

Accounts receivable as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Current portion of accounts receivable, net:
Accounts receivable, net	$	80,719	$	93,480
Accounts receivable, extended payment terms		144		644
		80,863		94,124
Accounts receivable, net of current portion:
Accounts receivable, extended payment terms		—		143
	$	80,863	$	94,267

The Company performs ongoing credit evaluations of its customers and, if necessary, provides a provision for doubtful accounts and expected losses. When assessing and recording its provision for doubtful accounts, the Company evaluates the age of its accounts receivable, current economic trends, creditworthiness of the customer, customer payment history, and other specific customer and transaction information. The Company writes off accounts receivable against the provision when it determines a balance is uncollectible and no longer actively pursues collection of the receivable. Adjustments to the provision for doubtful accounts are recorded as selling, general and administrative expenses in the condensed consolidated statements of operations and comprehensive (loss) income.

As of September 30, 2021 and December 31, 2020, the Company concluded that all amounts due under extended payment terms were collectible and no reserve for credit losses was recorded. During the nine months ended September 30, 2021 and 2020, the Company did not provide a reserve for credit losses and did not write off any uncollectible receivables due under extended payment terms.

Concentration of Risks

Concentration of Risks

Financial instruments that potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents and accounts receivable. Cash and cash equivalents consist of demand deposits, savings accounts, money market mutual funds, and certificates of deposit with financial institutions, which may exceed Federal Deposit Insurance Corporation limits. The Company has not experienced any losses related to its cash and cash equivalents and does not believe that it is subject to unusual credit risk beyond the normal credit risk associated with commercial banking relationships.

Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables:

	Revenue						Revenue
	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Customer A		24	%		13	%		20	%	*
Customer B	*				27	%	*				23	%
Customer C	*			*				11	%	*

	Accounts Receivable, Net
	September 30, 2021			December 31, 2020
Customer A		21	%	*
Customer D	*				17	%

* Less than 10% of total

Certain of the components and subassemblies included in the Company’s products are obtained from a single source or a limited group of suppliers. Although the Company seeks to reduce dependence on those single or limited source suppliers, the partial or complete loss of certain of these sources could have a material adverse effect on the Company’s operating results, financial condition and cash flows and damage its customer relationships.

Stock-Based Compensation

Stock-Based Compensation

The Company measures stock options and other stock-based awards granted to employees and directors based on the fair value on the date of grant and recognizes compensation expense of those awards, net of estimated forfeitures, over the requisite service period, which is generally the vesting period of the respective award. Generally, the Company issues stock options with only service-based vesting conditions and records the expense for these awards using the straight-line method.

The Company classifies stock-based compensation expense in its consolidated statements of operations and comprehensive (loss) income in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified.

The Company recognizes compensation expense for only the portion of awards that are expected to vest. In developing a forfeiture rate estimate, the Company has considered its historical experience to estimate pre-vesting forfeitures for service-based awards. The impact of a forfeiture rate adjustment will be recognized in full in the period of adjustment, and if the actual forfeiture rate is materially different from the Company’s estimate, the Company may be required to record adjustments to stock-based compensation expense in future periods.

The Company estimates the fair value of each stock option grant on the date of grant using the Black-Scholes option pricing model. The Company was a private company until December 14, 2017 and lacks sufficient company-specific historical and implied volatility information for its stock. Therefore, for all options granted in 2020 or before, the Company estimated its expected stock volatility based on the historical volatility of publicly traded peer companies. Beginning with options granted in 2021, the Company estimates its expected stock volatility using a weighted-average calculation based on the historical volatility of the Company and publicly traded peer companies and expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded stock price. The expected term of the Company’s stock options has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. The expected term of stock options granted to non-employees is equal to the contractual term of the option award. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. Expected dividend yield is based on the fact that the Company does not have a history of declaring or paying cash dividends, except for the special cash dividends declared in November 2014, June 2016, December 2016, May 2017 and November 2017, and in those circumstances the board of directors approved cash dividends to be paid to holders of the Company’s stock options, stock appreciation rights (“SARs”) and restricted stock units (“RSUs”) upon vesting as an equitable adjustment to the holders of such instruments.

The Company has also granted SARs to certain employees, which require the Company to pay in cash upon exercise an amount equal to the product of the excess of the per share fair market value of the Company’s common stock on the date of exercise over the exercise price, multiplied by the number of shares of common stock with respect to which the SAR is exercised. Because these awards may require the Company to settle the awards in cash, the Company accounts for them as a liability in the Company’s consolidated balance sheets. The Company recognizes the liability related to these awards, as well as related compensation expense over the period during which services are rendered until completed. As all SARs are now fully vested, the Company continues to remeasure the fair market value of the liability until the award is either exercised or canceled, with changes in the fair value of the liability recorded in the consolidated statements of operations and comprehensive (loss) income.

Impact of Recently Adopted and Issued Accounting Standards

Impact of Recently Adopted Accounting Standards

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):  Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity.  This guidance simplifies the guidance on certain financial instruments with characteristics of liability and equity, including convertible debt instruments.  As a result, entities will not separately present in equity an embedded conversion feature in such debt and will account for a convertible debt instrument wholly as debt, unless certain other conditions are met.  The elimination of these models will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that is within the scope of ASU 2020-06.  The ASU also simplifies the diluted earnings per share calculation in certain areas. The guidance will become effective for fiscal years beginning after December 15, 2021, with early adoption permitted no earlier than fiscal years beginning after December 15, 2020.  The Company has elected to early adopt this ASU and the adoption did not have a material impact on the Company’s condensed consolidated financial statements and the accompanying notes thereto.

Impact of Recently Issued Accounting Standards

In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842): Amendments to FASB Accounting Standards Codification (“ASU 2016-02”), which replaces the existing guidance for leases.  ASU 2016-02 requires the identification of arrangements that should be accounted for as leases by lessees.  In general, for lease arrangements exceeding a twelve-month term, the arrangements must now be recognized as assets and liabilities on the balance sheet of the lessee.  Under ASU 2016-02, a right-of-use asset and lease obligation will be recorded for all leases, whether operating or financing, while the income statement will reflect lease expense for operating leases and amortization/interest expense for financing leases.  The balance sheet amount recorded for existing leases at the date of adoption of ASU 2016-02 must be calculated using the applicable incremental borrowing rate at the date of adoption.  This guidance will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for annual reporting periods beginning after December 15, 2021, and interim periods within fiscal years beginning after December 15, 2022. The Company has begun planning for adoption by implementing a new lease accounting software and by working to establish additional changes to internal processes to comply with all requirements upon adoption.  The standard allows for, and the Company plans on using, a modified retrospective approach with comparatives under ASC 840, where entities would recognize a cumulative effect to retained earnings at the date of adoption without restating prior period balances or disclosure.  Management is continuing to assess the impact of ASU 2016-02 on the Company’s condensed consolidated financial statements and the accompanying notes thereto.  

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). This guidance is intended to provide more decision-useful information about expected credit losses on financial instruments and other commitments to extend credit held by a reporting entity at each reporting date. The main provisions include presenting financial assets measured at amortized cost at the amount expected to be collected, which is net of an allowance for expected credit losses, and recording credit losses related to available-for-sale securities through an allowance for credit losses. The effective dates for the amendments in ASU 2016-13 were updated in ASU 2019-10, Financial Instruments – Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842), and as such ASU 2016-13 will become effective for private companies, and emerging growth companies that choose to take advantage of the extended transition periods, for fiscal years beginning after December 15, 2022, including interim periods within those fiscal periods, and must be applied using a modified retrospective approach. The Company is currently evaluating the impact ASU 2016-13 will have on its consolidated financial statements.

Other

Other

Other than the disclosures above, there have been no changes to the significant accounting policies disclosed in Note 2 “Summary of Significant Accounting Policies” to the Company’s consolidated financial statements included in the Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

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Summary of Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2021

Accounting Policies [Abstract]

Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash in Accompanying Condensed Consolidated Balance Sheets

The following table is a reconciliation of cash, cash equivalents and restricted cash included in the accompanying condensed consolidated balance sheets that sum to the total cash, cash equivalents and restricted cash included in the accompanying condensed consolidated statements of cash flows:

	September 30, 2021		September 30, 2020
Cash and cash equivalents	$	156,460	$	156,191
Restricted cash included in other assets		1,000		1,004
	$	157,460	$	157,195

Schedule of Accounts Receivable

Accounts receivable as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Current portion of accounts receivable, net:
Accounts receivable, net	$	80,719	$	93,480
Accounts receivable, extended payment terms		144		644
		80,863		94,124
Accounts receivable, net of current portion:
Accounts receivable, extended payment terms		—		143
	$	80,863	$	94,267

Schedule of Significant Customers Represent 10% or More of Revenue or Accounts Receivable

Significant customers are those that represent 10% or more of revenue or accounts receivable and are set forth in the following tables:

	Revenue						Revenue
	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021			2020
Customer A		24	%		13	%		20	%	*
Customer B	*				27	%	*				23	%
Customer C	*			*				11	%	*

	Accounts Receivable, Net
	September 30, 2021			December 31, 2020
Customer A		21	%	*
Customer D	*				17	%

* Less than 10% of total

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Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2021

Goodwill And Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets Net

Intangible assets, net consisted of the following at September 30, 2021 and December 31, 2020, respectively:

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(8,037	)	$	16,963
Customer Relationships		18,000		(4,050	)		13,950
Trade Name		1,000		(747	)		253
Purchased software		1,817		(322	)		1,495
Totals as of September 30, 2021	$	45,817	$	(13,156	)	$	32,661

	Cost		Accumulated Amortization			Net Balance
Developed Technology	$	25,000	$	(5,358	)	$	19,642
Customer Relationships		18,000		(2,700	)		15,300
Trade Name		1,000		(498	)		502
Purchased software		432		(32	)		400
Totals as of December 31, 2020	$	44,432	$	(8,588	)	$	35,844

Schedule of Amortization Expense on Existing Intangible Assets

As of September 30, 2021, amortization expense on existing intangible assets for the next five years and beyond is as follows:

Year Ending December 31,
Remainder of 2021	$	1,532
2022		5,958
2023		5,760
2024		5,656
2025		5,651
Thereafter		8,104
	$	32,661

Summary of Amortization Expense

A summary of amortization expense recorded during the three and nine months ended September 30, 2021 and 2020 is as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product cost of revenue	$	893	$	893	$	2,679	$	2,679
Research and development		105		—		290		—
Selling, general and administrative		533		533		1,599		1,600
Totals	$	1,531	$	1,426	$	4,568	$	4,279

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Inventory (Tables)

9 Months Ended

Sep. 30, 2021

Inventory Disclosure [Abstract]

Schedule of Inventory

Inventory as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Raw materials	$	49,297	$	50,904
Work in process		—		19
Finished goods:
Manufactured finished goods		41,730		49,764
Deferred inventory costs		826		517
	$	91,853	$	101,204

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Property and Equipment (Tables)

9 Months Ended

Sep. 30, 2021

Property Plant And Equipment [Abstract]

Summary of Components of Property and Equipment

Property and equipment as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021			December 31, 2020
Computers and purchased software	$	25,284		$	24,865
Leasehold improvements		4,185			4,148
Furniture and fixtures		2,670			2,644
Machinery and equipment		37,427			36,701
Land		3,091			3,091
Building		4,765			4,765
Building improvements		7,282			7,244
Trial systems at customers’ sites		4,232			5,300
		88,936			88,758
Less: Accumulated depreciation and amortization		(64,289	)		(59,878	)
	$	24,647		$	28,880

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Accrued Expenses and Other Current Liabilities (Tables)

9 Months Ended

Sep. 30, 2021

Payables And Accruals [Abstract]

Schedule of Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30, 2021		December 31, 2020
Accrued compensation and related taxes	$	16,919	$	22,785
Inventory-related accruals		4,619		855
Accrued warranty		2,483		2,354
Other accrued expenses		9,347		13,799
	$	33,368	$	39,793

Summary of Changes in Amount Reserved for Warranty Costs

A summary of changes in the amount reserved for warranty costs for the nine months ended September 30, 2021 and 2020 is as follows:

	Nine Months Ended September 30,
	2021			2020
Warranty reserve at beginning of period	$	2,354		$	2,448
Provisions		2,015			2,054
Charges		(1,886	)		(2,103	)
Warranty reserve at end of period	$	2,483		$	2,399

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Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2021

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

The following tables present information about the fair value of the Company’s financial assets and liabilities as of September 30, 2021 and December 31, 2020 and indicate the level of the fair value hierarchy utilized to determine such fair values:

	Fair Value Measurements as of September 30, 2021 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,000	$	—	$	1,000
Money market mutual funds		127,221		—		—		127,221
Foreign currency forward contracts		—		24		—		24
	$	127,221	$	1,024	$	—	$	128,245
Liabilities:
SARs	$	—	$	—	$	458	$	458
	$	—	$	—	$	458	$	458

	Fair Value Measurements as of December 31, 2020 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Certificates of deposit—restricted cash	$	—	$	1,006	$	—	$	1,006
Money market mutual funds		114,404		—		—		114,404
	$	114,404	$	1,006	$	—	$	115,410
Liabilities:
SARs	$	—	$	—	$	493	$	493
	$	—	$	—	$	493	$	493

Summary of Changes in Fair Values of Stock Appreciation Rights (SARs) Liability

The following table provides a summary of changes in the fair values of the Company’s SARs liability, for which fair value is determined by Level 3 inputs:

	Nine Months Ended September 30,
	2021			2020
Fair value at beginning of period	$	493		$	264
Change in fair value		100			(7	)
Exercises		(135	)		—
Fair value at end of period	$	458		$	257

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Debt (Tables)

9 Months Ended

Sep. 30, 2021

Debt Disclosure [Abstract]

Schedule of Aggregate Principal Amount of Debt Outstanding

The aggregate principal amount of debt outstanding as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,		December 31,
	2021		2020
Term loan	$	278,975	$	288,000
Revolving credit facility		6,500		6,500
Total principal amount of debt outstanding	$	285,475	$	294,500

Schedule of Current and Non-Current Debt Obligations

Current and non-current debt obligations reflected in the condensed consolidated balance sheets as of September 30, 2021 and December 31, 2020 consisted of the following:

	September 30,			December 31,
	2021			2020
Current liabilities:
Term loan	$	3,000		$	9,775
Revolving credit facility		6,500			6,500
Current portion of principal payment obligations		9,500			16,275
Unamortized debt issuance costs, current portion		(1,079	)		(1,104	)
Current portion of long-term debt, net of    unamortized debt issuance costs	$	8,421		$	15,171
Non-current liabilities:
Term loan	$	275,975		$	278,225
Unamortized debt issuance costs, non-current portion		(1,303	)		(2,140	)
Long-term debt, net of current portion and    unamortized debt issuance costs	$	274,672		$	276,085

Schedule of Aggregate Minimum Future Principal Payments of Debt

As of September 30, 2021, aggregate minimum future principal payments of the Company’s debt are summarized as follows:

Year Ending December 31,
Remainder of 2021	$	7,250
2022		3,000
2023		275,225
Thereafter		—
	$	285,475

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Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2021

Equity [Abstract]

Schedule of Equitable Adjustment Payments

The below table provides details of these equitable adjustment payments:

				Equitable Adjustment Payments
				Nine Months Ended				Equitable Adjustment Liability(1)
Dividend Declaration Dates	Equitable Adjustment per share		Year of Final Vesting	September 30, 2021		September 30, 2020		As of September 30, 2021		As of December 31, 2020
November 30, 2017	$	0.5802	2021	$	42	$	136	$	1	$	30
May 10, 2017		1.1774	2021		53		176		—		31
December 27, 2016		2.3306	2020		2		295		—		2
June 17, 2016		0.5891	2020		—		54		—		—
Total				$	97	$	661	$	1	$	63

(1) Net of estimated forfeitures. Actual payouts may vary based on actual forfeitures. Amounts are included in accrued expenses and other current liabilities in the accompanying condensed consolidated balance sheets.

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Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2021

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Summary of Outstanding Stock Option and Information Related to Stock Options Activity

The following table summarizes the outstanding stock option activity and a summary of information related to stock options as of and for the nine months ended September 30, 2021:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term		Aggregate Intrinsic Value
						(in years)
Outstanding at January 1, 2021		7,120		$	8.01		4.88	$	9,367
Granted		116			8.23
Exercised		(904	)		2.26
Forfeited		(292	)		10.70
Outstanding at September 30, 2021		6,040		$	8.74		4.53	$	7,200
Options exercisable at September 30, 2021		5,665		$	8.69		4.28	$	6,924
Vested or expected to vest at September 30, 2021		6,032		$	8.74		4.52	$	7,182

Assumptions of Estimated Fair Value of Option on the Date of Grant Using Black-Scholes Option Pricing Model

The fair value of each option is estimated on the date of grant using the Black-Scholes option-pricing model using the following assumptions:

	Three Months Ended September 30,		Nine Months Ended September 30,
	2021	2020	2021	2020
Risk-free interest rate	1.0%	0.4%	1.0%	0.4%-0.7%
Expected term (in years)	6.1	6.1	6.1	6.1
Expected volatility	38.6%	31.8%	38.2%-38.6%	29.3%-31.8%
Expected dividend yield	0.0%	0.0%	0.0%	0.0%

Summary of RSU Activity

A summary of RSU activity under the Company’s 2011 Stock Incentive Plan (the “2011 Plan”) and the 2017 Plan for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		4,231		$	5.43
Granted		1,660			8.26
Vested		(1,241	)		6.15	$	10,149
Forfeited		(270	)		4.68
Unvested balance at September 30, 2021		4,380		$	6.34

Assumptions of Estimated Based on Monte Carlo Simulation Model

Compensation expense is based on the estimated value of the awards on the grant date, and is recognized over the period from the grant date through the expected vest dates of each vesting condition, both of which were estimated based on a Monte Carlo simulation model applying the following key assumptions:

	Nine Months Ended September 30,
	2021	2020
Risk-free interest rate	0.2%	1.2%
Volatility	78.6%	70.0%
Dividend yield	0.0%	0.0%
Cost of equity	12.0%	11.0%

Summary of PSU Activity

A summary of PSU activity for the nine months ended September 30, 2021 is as follows:

	Number of Shares			Weighted- Average Grant Date Fair Value		Aggregate Fair Value
Unvested balance at January 1, 2021		737		$	3.22
Granted		442			7.89
Vested		(737	)		3.22	$	6,449
Forfeited		—			—
Unvested balance at September 30, 2021		442		$	7.89

Schedule of Stock-based Compensation Expense

Stock-based compensation expense related to stock options, RSUs, SARs and PSUs for the three and nine months ended September 30, 2021 and 2020 was classified in the condensed consolidated statements of operations and comprehensive (loss) income as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Cost of revenue	$	29	$	45	$	95	$	115
Research and development expenses		557		592		1,971		1,679
Selling, general and administrative expenses		3,112		2,845		9,179		7,704
Total stock-based compensation	$	3,698	$	3,482	$	11,245	$	9,498

The Company recognized stock-based compensation expense for the three and nine months ended September 30, 2021 and 2020 in the condensed consolidated balance sheet as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2021			2020			2021		2020
Change in fair value of SAR Liability	$	(188	)	$	(14	)	$	100	$	(7	)
Recognized as additional paid-in capital		3,886			3,496			11,145		9,505
Total stock-based compensation	$	3,698		$	3,482		$	11,245	$	9,498

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Net (Loss) Income per Share (Tables)

9 Months Ended

Sep. 30, 2021

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net (Loss) Income Per Share Attributable to Common Stockholders

Basic and diluted net (loss) income per share attributable to common stockholders was calculated as follows:

	Three Months Ended September 30,					Nine Months Ended September 30,
	2021			2020		2021		2020
Numerator:
Net (loss) income attributable to common    stockholders, basic and diluted	$	(876	)	$	3,473	$	1,680	$	1,607
Denominator:
Weighted-average shares used to compute net   (loss) income per share attributable to common    stockholders, basic		85,660			83,302		84,985		83,437
Dilutive effect of stock options		—			1,125		1,765		1,207
Dilutive effect of restricted stock units		—			1,039		2,198		726
Weighted-average shares used to compute net    (loss) income per share attributable to common    stockholders, diluted		85,660			85,466		88,948		85,370
Net (loss) income per share attributable to common    stockholders:
Basic	$	(0.01	)	$	0.04	$	0.02	$	0.02
Diluted	$	(0.01	)	$	0.04	$	0.02	$	0.02

Schedule of Potential Common Shares Excluded from the Computation of Diluted Net (Loss) Income Per Share Attributable to Common Stockholders

The following potential common shares, presented based on amounts outstanding at each period end, were excluded from the computation of diluted net (loss) income per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Options to purchase common stock		6,040		4,156		3,459		4,156
Unvested restricted stock units		4,380		1,001		723		1,001
Unvested performance-based stock units		442		983		—		983

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Revenue from Contracts with Customers (Tables)

9 Months Ended

Sep. 30, 2021

Revenue From Contract With Customer [Abstract]

Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address

The Company also disaggregates its revenue based on geographic locations of its customers, as determined by the customer’s shipping address, summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
North America:
United States	$	40,671	$	32,036	$	101,534	$	90,825
Canada		11,087		6,428		61,875		15,170
Total North America		51,758		38,464		163,409		105,995
Europe, Middle East and Africa:		6,547		6,047		19,478		27,493
Asia-Pacific:
Australia		24,329		38,889		68,527		86,848
Other		8,832		10,014		24,526		31,884
Total Asia-Pacific		33,161		48,903		93,053		118,732
Latin America		7,753		12,333		20,286		20,500
Total revenue(1)	$	99,219	$	105,747	$	296,226	$	272,720

(1) Other than the United States, Canada and Australia, no individual countries represented 10% or more of the Company’s total revenue for any of the periods presented.

Summary of Disaggregates of Revenue Based on Product Line

The Company also disaggregates its revenue based on product line summarized as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2021		2020		2021		2020
Product revenue:
Wireless	$	43,070	$	26,825	$	116,081	$	62,992
Fixed telco		20,187		34,005		51,209		75,756
Cable		24,495		32,911		94,729		100,879
Total product revenue		87,752		93,741		262,019		239,627
Service revenue:
Wireless		1,141		2,396		3,416		5,244
Fixed telco		825		441		3,474		992
Cable		9,501		9,169		27,317		26,857
Total service revenue		11,467		12,006		34,207		33,093
Total revenue	$	99,219	$	105,747	$	296,226	$	272,720

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Segment Information (Tables)

9 Months Ended

Sep. 30, 2021

Segment Reporting [Abstract]

Schedule of Property and Equipment, Net by Location

The Company’s property and equipment, net by location was as follows:

	September 30, 2021		December 31, 2020
United States	$	17,431	$	20,988
China		3,144		2,986
Australia		2,236		2,849
Other		1,836		2,057
Total property and equipment, net	$	24,647	$	28,880

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Summary of Significant Accounting Policies - Additional Information (Details) - USD ($)	1 Months Ended	9 Months Ended
	Aug. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Significant Accounting Policies [Line Items]
Change in accounting principle accounting standards update adopted	true
Change in accounting principle, accounting standards update, early adoption [true false]	true
Change in accounting principle accounting standards update immaterial effect	true
Accounting standards update description	ASU 2020-06
Accounts Receivable, Extended Payment Terms
Significant Accounting Policies [Line Items]
Reserve for credit losses		$ 0		$ 0
Write off of uncollectible receivables		0	$ 0
Certificates of Deposit
Significant Accounting Policies [Line Items]
Restricted cash		$ 1,000,000		$ 1,006,000

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Summary of Significant Accounting Policies - Summary of Reconciliation of Cash, Cash Equivalents and Restricted Cash in Accompanying Condensed Consolidated Balance Sheets (Details) - USD ($) $ in Thousands	Sep. 30, 2021		Dec. 31, 2020	Sep. 30, 2020		Dec. 31, 2019
Accounting Policies [Abstract]
Cash and cash equivalents	$ 156,460		$ 157,455	$ 156,191
Restricted cash included in other assets	$ 1,000			$ 1,004
Restricted Cash and Cash Equivalents, Noncurrent, Asset, Statement of Financial Position [Extensible List]	Other assets			Other assets
Cash and cash equivalents, restricted cash	$ 157,460	[1]	$ 158,461	$ 157,195	[1]	$ 114,657

[1] See Note 2 of the accompanying notes for a reconciliation of the ending balance of cash, cash equivalents and restricted cash shown in these unaudited condensed consolidated statements of cash flows.

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Summary of Significant Accounting Policies - Schedule of Accounts Receivable (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	$ 80,863	$ 94,124
Accounts receivable, net of current portion:
Accounts receivable, net of current portion		143
Accounts receivable	80,863	94,267
Accounts Receivable, Net
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	80,719	93,480
Accounts Receivable, Extended Payment Terms
Current portion of accounts receivable, net:
Current portion of accounts receivable, net	$ 144	$ 644

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Summary of Significant Accounting Policies - Schedule of Significant Customers Represent 10% or More of Revenue or Accounts Receivable (Details) - Customer Concentration Risk	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Customer A | Revenue
Concentration Risk [Line Items]
Concentration risk percentage	24.00%	13.00%	20.00%
Customer A | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage			21.00%
Customer B | Revenue
Concentration Risk [Line Items]
Concentration risk percentage		27.00%		23.00%
Customer C | Revenue
Concentration Risk [Line Items]
Concentration risk percentage			11.00%
Customer D | Accounts Receivable
Concentration Risk [Line Items]
Concentration risk percentage					17.00%

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Goodwill and Intangible Assets - Schedule of Intangible Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Finite Lived Intangible Assets [Line Items]
Cost	$ 45,817	$ 44,432
Accumulated Amortization	(13,156)	(8,588)
Net Balance	32,661	35,844
Developed Technology
Finite Lived Intangible Assets [Line Items]
Cost	25,000	25,000
Accumulated Amortization	(8,037)	(5,358)
Net Balance	16,963	19,642
Customer Relationships
Finite Lived Intangible Assets [Line Items]
Cost	18,000	18,000
Accumulated Amortization	(4,050)	(2,700)
Net Balance	13,950	15,300
Trade Name
Finite Lived Intangible Assets [Line Items]
Cost	1,000	1,000
Accumulated Amortization	(747)	(498)
Net Balance	253	502
Purchased Software
Finite Lived Intangible Assets [Line Items]
Cost	1,817	432
Accumulated Amortization	(322)	(32)
Net Balance	$ 1,495	$ 400

XML

Goodwill and Intangible Assets - Schedule of Amortization Expense on Existing Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Remainder of 2021	$ 1,532
2022	5,958
2023	5,760
2024	5,656
2025	5,651
Thereafter	8,104
Net Balance	$ 32,661	$ 35,844

XML

Goodwill and Intangible Assets - Summary of Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 1,531	$ 1,426	$ 4,568	$ 4,279
Product Cost of Revenue
Finite Lived Intangible Assets [Line Items]
Amortization expense	893	893	2,679	2,679
Research and Development
Finite Lived Intangible Assets [Line Items]
Amortization expense	105		290
Selling, General and Administrative Expenses
Finite Lived Intangible Assets [Line Items]
Amortization expense	$ 533	$ 533	$ 1,599	$ 1,600

XML

Goodwill and Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 50,177	$ 50,177

XML

Inventory - Schedule of Inventory (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Inventory Disclosure [Abstract]
Raw materials	$ 49,297	$ 50,904
Work in process		19
Finished goods:
Manufactured finished goods	41,730	49,764
Deferred inventory costs	826	517
Total inventory	$ 91,853	$ 101,204

XML

Property and Equipment - Summary of Components of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 88,936	$ 88,758
Less: Accumulated depreciation and amortization	(64,289)	(59,878)
Property and equipment, net	24,647	28,880
Computers and Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	25,284	24,865
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,185	4,148
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,670	2,644
Machinery and Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	37,427	36,701
Land
Property Plant And Equipment [Line Items]
Property and equipment, gross	3,091	3,091
Building
Property Plant And Equipment [Line Items]
Property and equipment, gross	4,765	4,765
Building Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	7,282	7,244
Trial Systems at Customers' Sites
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 4,232	$ 5,300

XML

Property 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
Property Plant And Equipment [Line Items]
Depreciation and amortization expense on property and equipment	$ 2,258	$ 2,968	$ 7,418	$ 9,370
Trial Systems
Property Plant And Equipment [Line Items]
Transfers to inventory from property and equipment			1,145	690
Equipment
Property Plant And Equipment [Line Items]
Transfers to inventory from property and equipment			$ 325	$ 766

XML

Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Payables And Accruals [Abstract]
Accrued compensation and related taxes	$ 16,919	$ 22,785
Inventory-related accruals	4,619	855
Accrued warranty	2,483	2,354
Other accrued expenses	9,347	13,799
Total accrued expenses and other current liabilities	$ 33,368	$ 39,793

XML

Accrued Expenses and Other Current Liabilities - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021
Accrued Expenses And Other Current Liabilities [Line Items]
Standard product warranty description	the Company’s products are covered by warranties for software and hardware for periods ranging from 90 days to one year.
Extended product warranty description	the Company offers an extended warranty for periods typically of one to three years for agreed-upon fees.
Minimum
Accrued Expenses And Other Current Liabilities [Line Items]
Product warranties period for software and hardware	90 days
Extended product warranty period for renewals of maintenance and support contracts	1 year
Maximum
Accrued Expenses And Other Current Liabilities [Line Items]
Product warranties period for software and hardware	1 year
Extended product warranty period for renewals of maintenance and support contracts	3 years

XML

Accrued Expenses and Other Current Liabilities - Summary of Changes in Amount Reserved for Warranty Costs (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Product Warranties Disclosures [Abstract]
Warranty reserve at beginning of period	$ 2,354	$ 2,448
Provisions	2,015	2,054
Charges	(1,886)	(2,103)
Warranty reserve at end of period	$ 2,483	$ 2,399

XML

Fair Value Measurements - Fair Value of Financial Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Assets:
Assets fair value	$ 128,245	$ 115,410
Liabilities:
Liabilities fair value	458	493
Certificates of Deposit - Restricted Cash
Assets:
Assets fair value	1,000	1,006
Money Market Mutual Funds
Assets:
Assets fair value	127,221	114,404
Foreign Currency Forward Contracts
Assets:
Assets fair value	24
Level 1
Assets:
Assets fair value	127,221	114,404
Level 1 | Money Market Mutual Funds
Assets:
Assets fair value	127,221	114,404
Level 2
Assets:
Assets fair value	1,024	1,006
Level 2 | Certificates of Deposit - Restricted Cash
Assets:
Assets fair value	1,000	1,006
Level 2 | Foreign Currency Forward Contracts
Assets:
Assets fair value	24
Level 3
Liabilities:
Liabilities fair value	458	493
SARs | Share Based Compensation Liability
Liabilities:
Liabilities fair value	458	493
SARs | Level 3 | Share Based Compensation Liability
Liabilities:
Liabilities fair value	$ 458	$ 493

XML

Fair Value Measurements - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value Disclosures [Abstract]
Fair value, assets, transfers from Level 1 to Level 2	$ 0	$ 0
Fair value, assets, transfers from Level 2 to Level 1	0	0
Fair value, liabilities, transfers from Level 1 to Level 2	0	0
Fair value, liabilities, transfers from Level 2 to Level 1	0	0
Fair value, assets, transfers into Level 3	0	0
Fair value, assets, transfers out of Level 3	0	0
Fair value, liabilities, transfers into Level 3	0	0
Fair value, liabilities, transfers out of Level 3	$ 0	$ 0

XML

Fair Value Measurements - Summary of Changes in Fair Values of Stock Appreciation Rights (SARs) Liability (Details) - Level 3 - SARs - Share Based Compensation Liability - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value at beginning of period	$ 493	$ 264
Change in fair value	100	(7)
Exercises	(135)
Fair value at end of period	$ 458	$ 257

XML

Derivative Instruments - Additional Information (Details) $ in Thousands, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2020 AUD ($)	Sep. 30, 2020 AUD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2021 EUR (€)	Sep. 30, 2021 AUD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2020 AUD ($)
Cash Flow Hedges
Derivatives Fair Value [Line Items]
Derivative notional amount outstanding					$ 0			$ 0
Australian Subsidiary
Derivatives Fair Value [Line Items]
Fair value of derivative amount recognized	$ 725	$ 1,613
Australian Subsidiary | Product Cost of Revenue
Derivatives Fair Value [Line Items]
Fair value of derivative amount recognized	57	124
Australian Subsidiary | Research and Development
Derivatives Fair Value [Line Items]
Fair value of derivative amount recognized	353	890
Australian Subsidiary | Selling, General and Administrative Expense
Derivatives Fair Value [Line Items]
Fair value of derivative amount recognized	315	599
Australian Subsidiary | Cash Flow Hedges
Derivatives Fair Value [Line Items]
Amount of gain reclassified from other comprehensive (loss) income	527	752
Foreign Currency Forward Contracts | Prepaid Expenses and Other Current Assets
Derivatives Fair Value [Line Items]
Derivatives asset fair value			$ 24			$ 0
Foreign Currency Forward Contracts | Accrued Expenses And Other Current Liabilities
Derivatives Fair Value [Line Items]
Liability derivatives			$ 0			$ 0
Foreign Currency Forward Contracts | Australian Subsidiary
Derivatives Fair Value [Line Items]
Outstanding notional amounts | €				€ 1,379,000			€ 0
Foreign Currency Forward Contracts One | Australian Subsidiary | Cash Flow Hedges
Derivatives Fair Value [Line Items]
Derivative notional amounts settled	$ 5,000	8,500
Foreign Currency Forward Contracts Two | Australian Subsidiary | Cash Flow Hedges
Derivatives Fair Value [Line Items]
Derivative notional amounts settled		$ 5,000

XML

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate	85.80%	40.90%	11.60%	142.00%
(Benefit from) provision for income taxes	$ (5,288)	$ 2,399	$ 220	$ (5,433)
Discrete tax benefit	$ (7,097)		$ (7,097)	$ (9,310)

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Debt - Schedule of Aggregate Principal Amount of Debt Outstanding (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Total principal amount of debt outstanding	$ 285,475	$ 294,500
Revolving Credit Facility
Debt Instrument [Line Items]
Total principal amount of debt outstanding	6,500	6,500
Term Loan
Debt Instrument [Line Items]
Total principal amount of debt outstanding	$ 278,975	$ 288,000

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Debt - Schedule of Current and Non-Current Debt Obligations (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Current liabilities:
Current portion of principal payment obligations	$ 9,500	$ 16,275
Revolving credit facility	6,500	6,500
Unamortized debt issuance costs, current portion	(1,079)	(1,104)
Current portion of long-term debt, net of unamortized debt issuance costs	8,421	15,171
Non-current liabilities:
Unamortized debt issuance costs, non-current portion	(1,303)	(2,140)
Long-term debt, net of current portion and unamortized debt issuance costs	274,672	276,085
Term Loan
Current liabilities:
Current portion of principal payment obligations	3,000	9,775
Non-current liabilities:
Non-current portion of principal payment obligations	$ 275,975	$ 278,225

XML

Debt - Schedule of Aggregate Minimum Future Principal Payments of Debt (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Disclosure [Abstract]
Remainder of 2021	$ 7,250
2022	3,000
2023	275,225
Aggregate minimum future principal payments of debt	$ 285,475

XML

Debt - Additional Information (Details)			3 Months Ended		9 Months Ended		12 Months Ended
	Dec. 20, 2016 USD ($)	Jul. 01, 2015 USD ($) Installment	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)
Debt Instrument [Line Items]
Outstanding borrowings			$ 285,475,000		$ 285,475,000
JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders | Maximum
Debt Instrument [Line Items]
Maximum amount of increase in facilities	$ 70,000,000
JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate description					Borrowings under the facilities bear interest at a floating rate, which can be either a Eurodollar rate plus an applicable margin or, at the Company’s option, a base rate (defined as the highest of (x) the JPMorgan Chase, N.A. prime rate, (y) the federal funds effective rate, plus one-half percent (0.50%) per annum and (z) a one-month Eurodollar rate plus 1.00% per annum) plus an applicable margin. The applicable margin for borrowings under the term loan facility is 4.00% per annum for Eurodollar rate loans (subject to a 1.00% per annum interest rate floor) and 3.00% per annum for base rate loans. The applicable margin for borrowings under the revolving credit facility is 1.75% per annum for Eurodollar rate loans and 0.75% per annum for base rate loans, subject to reduction based on the Company’s maintaining specified net leverage ratios. The interest rates payable under the facilities are subject to an increase of 2.00% per annum during the continuance of any payment default.
Debt instrument prepayment description					In addition, the Company is required to make mandatory prepayments under the facilities with respect to (i) 100% of the net cash proceeds from certain asset dispositions (including casualty and condemnation events) by the Company or certain of its subsidiaries, subject to certain exceptions and reinvestment provisions, (ii) 100% of the net cash proceeds from the issuance or incurrence of any additional debt by the Company or certain of its subsidiaries, subject to certain exceptions, and (iii) 50% of the Company’s excess cash flow, as defined in the credit agreement, subject to reduction upon its achievement of specified performance targets.
Percentage of net proceeds from asset dispositions to be used for mandatory prepayment	100.00%
Percentage of net cash proceeds from issuances or incurrence of additional Debt to be used for mandatory prepayment	100.00%
Percentage on excess cash flow for mandatory prepayments of debt	50.00%
Debt instrument, mandatory prepayment of debt payable							$ 6,775
JPMorgan Chase Bank, N. A. | Minimum
Debt Instrument [Line Items]
Line of credit facility borrowing capacity utilized percentage			30.00%		30.00%		30.00%
Term Loan Facility | JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders
Debt Instrument [Line Items]
Maximum borrowing amount under facility	$ 300,000,000
Outstanding borrowings			$ 278,975,000		$ 278,975,000		$ 288,000,000
Term Loan Facility | JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	4.00%
Debt instrument, interest rate description					As of September 30, 2021 and December 31, 2020, the interest rate on the Term Loans was 5.00% per annum, which was based on a one-month and six-month Eurodollar rate, respectively, at the applicable floor of 1.00% per annum plus the applicable margin of 4.00% per annum for Eurodollar rate loans.
Debt instrument, effective interest rate percentage			5.00%		5.00%		5.00%
Debt issuance costs	$ 7,811,000
Debt instrument, principal payment			$ 750,000	$ 750,000	$ 9,025,000	$ 2,250,000
Interest expense, including amortization of debt issuance costs			$ 3,870,000	3,892,000	$ 11,672,000	12,366,000
Debt instrument, maturity date	Dec. 20, 2023
Original principal amount of term loan amortization percentage	1.00%
Principal amount of loan	$ 300,000,000
Term Loan Facility | JPMorgan Chase Bank, N. A. | Eurodollar Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage					4.00%		4.00%
Debt instrument, effective interest rate percentage			1.00%		1.00%		1.00%
Term Loan Facility | JPMorgan Chase Bank, N. A. | Floor Rate
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	1.00%
Term Loan Facility | JPMorgan Chase Bank, N. A. | Base Rate
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	3.00%
Commercial Mortgage Loan
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage		3.50%
Debt instrument, principal payment				6,483,000		6,643,000
Interest expense, including amortization of debt issuance costs				0		120,000
Debt instrument, maturity date		Jul. 01, 2020
Principal amount of loan		$ 7,950,000
Debt instrument, number of periodic payment installments | Installment		60
Debt instrument, principal and interest payment		$ 46,000
Debt instrument payment, amortization period		20 years
Debt issuance cost		$ 45,000
Revolving Credit Facility | JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders
Debt Instrument [Line Items]
Maximum borrowing amount under facility	$ 25,000,000
Outstanding borrowings			$ 6,500,000		$ 6,500,000		$ 6,500,000
Revolving Credit Facility | JPMorgan Chase Bank, N. A.
Debt Instrument [Line Items]
Debt instrument, interest rate increase	2.00%
Line of credit facility, interest rate			1.83%		1.83%		2.12%
Line of credit facility, interest rate description					As of September 30, 2021, the interest rate on the revolving credit facility was 1.83% per annum, which was based on a one-month Eurodollar rate of 0.08% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans. As of December 31, 2020, the interest rate on the revolving credit facility was 2.12% per annum, which was based on the six-month Eurodollar rate of 0.37% per annum plus the applicable margin of 1.75% per annum for Eurodollar rate loans
Payment of quarterly commitment fees percentage			0.25%
Interest expense related to the fee for the unused amount			$ 11,000	$ 11,000	$ 33,000	$ 41,000
Debt instrument, maturity date	Dec. 20, 2021
Revolving Credit Facility | JPMorgan Chase Bank, N. A. | Federal Funds Effective Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage	0.50%
Revolving Credit Facility | JPMorgan Chase Bank, N. A. | Eurodollar Rate
Debt Instrument [Line Items]
Debt instrument, variable interest rate percentage	1.00%				1.75%		1.75%
Debt instrument, interest rate stated percentage	1.75%
Line of credit facility, interest rate			0.08%		0.08%		0.37%
Revolving Credit Facility | JPMorgan Chase Bank, N. A. | Base Rate
Debt Instrument [Line Items]
Debt instrument, interest rate stated percentage	0.75%
Stand-by Letter of Credit | JPMorgan Chase Bank, N.A. and Barclays Bank PLC and Various Lenders
Debt Instrument [Line Items]
Line of credit facility, used as collateral amount			$ 1,450,000		$ 1,450,000		$ 1,454,000

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Stockholders' Equity - Schedule of Equitable Adjustment Payments (Details) - Vested Equity Awards - USD ($) $ / shares in Units, $ in Thousands					9 Months Ended
	Nov. 30, 2017	May 10, 2017	Dec. 27, 2016	Jun. 17, 2016	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Class Of Stock [Line Items]
Equitable Adjustment Payments					$ 97	$ 661
Accrued Expenses And Other Current Liabilities
Class Of Stock [Line Items]
Equitable Adjustment Liability					1		$ 63
November 30, 2017 Special Dividend
Class Of Stock [Line Items]
Dividend Declaration Dates	Nov. 30, 2017
Equitable Adjustment per share	$ 0.5802
Year of Final Vesting	2021
Equitable Adjustment Payments					42	136
November 30, 2017 Special Dividend | Accrued Expenses And Other Current Liabilities
Class Of Stock [Line Items]
Equitable Adjustment Liability					1		30
May 10, 2017 Special Dividend
Class Of Stock [Line Items]
Dividend Declaration Dates		May 10, 2017
Equitable Adjustment per share		$ 1.1774
Year of Final Vesting		2021
Equitable Adjustment Payments					53	176
May 10, 2017 Special Dividend | Accrued Expenses And Other Current Liabilities
Class Of Stock [Line Items]
Equitable Adjustment Liability							31
December 27, 2016 Special Dividend
Class Of Stock [Line Items]
Dividend Declaration Dates			Dec. 27, 2016
Equitable Adjustment per share			$ 2.3306
Year of Final Vesting			2020
Equitable Adjustment Payments					$ 2	295
December 27, 2016 Special Dividend | Accrued Expenses And Other Current Liabilities
Class Of Stock [Line Items]
Equitable Adjustment Liability							$ 2
June 17, 2016 Special Dividend
Class Of Stock [Line Items]
Dividend Declaration Dates				Jun. 17, 2016
Equitable Adjustment per share				$ 0.5891
Year of Final Vesting				2020
Equitable Adjustment Payments						$ 54

XML

Stockholders' Equity - Additional Information (Details) - Common Stock - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Feb. 21, 2019
Class Of Stock [Line Items]
Stock repurchase program, common stock remaining authorized to be repurchased	$ 70,208,000		$ 70,208,000
Stock repurchase program, stock repurchased, shares	0	0	0	1,227,000
Stock repurchase program, stock repurchased, value				$ 3,031,000
Maximum
Class Of Stock [Line Items]
Stock repurchase program, common stock authorized to be repurchased					$ 75,000,000

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Stock-based Compensation - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Cash proceeds received upon the exercise of options	$ 3,532	$ 957
Fair value of liability	458		$ 493
Unrecognized compensation cost	$ 25,442
Weighted-average period of unrecognized compensation cost expected to be recognized	2 years 8 months 1 day
Stock Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Weighted average grant date fair value per share of options	$ 3.15	$ 0.98
Cash proceeds received upon the exercise of options	$ 3,532	$ 955
Intrinsic value of stock options exercised	$ 5,182	$ 1,480
Performance-Based Stock Units
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	3 years	3 years
Number of award outstanding	442,000		737,000
Stock Appreciation Rights
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Award vesting period	4 years
Award expiration period	10 years
Number of award outstanding	200,000
Exercised fair value of SAR	$ 6.75
Number of SAR exercised	20,000
Fair value of SAR	$ 2.29
Stock Appreciation Rights | Accrued Expenses And Other Current Liabilities
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value of liability	$ 458		$ 493
2017 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized for grant	20,617,000
Number of remaining shares available for grant	9,755,000
2011 and 2017 Stock Incentive Plan | RSUs and PSUs | Common Stock
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares of common stock in settlement of employee tax withholding obligations	779,000	150,000

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Stock-based Compensation - Summary of Outstanding Stock Option and Information Related to Stock Options Activity (Details) - 2017 Stock Incentive Plan - Stock Options $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Outstanding, Beginning Balance | shares	7,120
Number of Shares, Granted | shares	116
Number of Shares, Exercised | shares	(904)
Number of Shares, Forfeited | shares	(292)
Number of Shares, Outstanding, Ending Balance | shares	6,040	7,120
Number of Shares, Options exercisable at June 30, 2021 | shares	5,665
Number of Shares, Vested or expected to vest at June 30, 2021 | shares	6,032
Weighted-Average Exercise Price, Outstanding, Beginning Balance | $ / shares	$ 8.01
Weighted-Average Exercise Price, Granted | $ / shares	8.23
Weighted-Average Exercise Price, Exercised | $ / shares	2.26
Weighted-Average Exercise Price, Forfeited | $ / shares	10.70
Weighted-Average Exercise Price, Outstanding, Ending Balance | $ / shares	8.74	$ 8.01
Weighted-Average Exercise Price, Options exercisable at June 30, 2021 | $ / shares	8.69
Weighted-Average Exercise Price, Vested or expected to vest at June 30, 2021 | $ / shares	$ 8.74
Weighted-Average Remaining Contractual Term, Outstanding	4 years 6 months 10 days	4 years 10 months 17 days
Weighted-Average Remaining Contractual Term, Options exercisable at June 30, 2021	4 years 3 months 10 days
Weighted-Average Remaining Contractual Term, Vested or expected to vest at June 30, 2021	4 years 6 months 7 days
Aggregate Intrinsic Value, Outstanding | $	$ 7,200	$ 9,367
Aggregate Intrinsic Value, Options exercisable at June 30, 2021 | $	6,924
Aggregate Intrinsic Value, Vested or expected to vest at June 30, 2021 | $	$ 7,182

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Stock-based Compensation - Assumptions of Estimated Fair Value of Option on the Date of Grant Using Black-Scholes Option Pricing Model (Details) - Stock Options	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 [Line Items]
Risk-free interest rate	1.00%	0.40%	1.00%
Expected term (in years)	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days	6 years 1 month 6 days
Expected volatility	38.60%	31.80%
Expected volatility, Minimum			38.20%	29.30%
Expected volatility, Maximum			38.60%	31.80%
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate				0.40%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate				0.70%

XML

Stock-based Compensation - Summary of RSU Activity (Details) - 2011 and 2017 Stock Incentive Plan - Restricted Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested, Beginning Balance | shares	4,231
Number of Shares, Granted | shares	1,660
Number of Shares, Vested | shares	(1,241)
Number of Shares, Forfeited | shares	(270)
Number of Shares, Unvested, Ending Balance | shares	4,380
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares	$ 5.43
Weighted-Average Grant Date Fair Value, Granted | $ / shares	8.26
Weighted-Average Grant Date Fair Value, Vested | $ / shares	6.15
Weighted-Average Grant Date Fair Value, Forfeited | $ / shares	4.68
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares	$ 6.34
Aggregate Fair Value, Vested | $	$ 10,149

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Stock-based Compensation - Assumptions of Estimated Based on Monte Carlo Simulation Model (Details) - Performance-Based Stock Units	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate	0.20%	1.20%
Expected volatility	78.60%	70.00%
Expected dividend yield	0.00%	0.00%
Cost of equity	12.00%	11.00%

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Stock-based Compensation - Summary of PSU Activity (Details) - Performance-Based Stock Units $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2021 USD ($) $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Unvested, Beginning Balance | shares	737
Number of Shares, Granted | shares	442
Number of Shares, Vested | shares	(737)
Number of Shares, Unvested, Ending Balance | shares	442
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance | $ / shares	$ 3.22
Weighted-Average Grant Date Fair Value, Granted | $ / shares	7.89
Weighted-Average Grant Date Fair Value, Vested | $ / shares	3.22
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance | $ / shares	$ 7.89
Aggregate Fair Value, Vested | $	$ 6,449

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Stock-based Compensation - Schedule of 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 [Line Items]
Total stock-based compensation	$ 3,698	$ 3,482	$ 11,245	$ 9,498
Product Cost of Revenue
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	29	45	95	115
Research and Development Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	557	592	1,971	1,679
Selling, General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Total stock-based compensation	$ 3,112	$ 2,845	$ 9,179	$ 7,704

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Stock-based Compensation - Summary of Stock-based Compensation Expense Recognized in the Consolidated Balance Sheet (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Change in fair value of SAR Liability	$ (188)	$ (14)	$ 100	$ (7)
Recognized as additional paid-in capital	3,886	3,496	11,145	9,505
Total stock-based compensation	$ 3,698	$ 3,482	$ 11,245	$ 9,498

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Net (Loss) Income per Share - Schedule of Basic and Diluted Net (Loss) Income Per Share Attributable to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Numerator:
Net (loss) income attributable to common stockholders, basic and diluted	$ (876)	$ 3,473	$ 1,680	$ 1,607
Denominator:
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders, basic	85,660	83,302	84,985	83,437
Dilutive effect of stock options		1,125	1,765	1,207
Dilutive effect of restricted stock units		1,039	2,198	726
Weighted-average shares used to compute net (loss) income per share attributable to common stockholders, diluted	85,660	85,466	88,948	85,370
Net (loss) income per share attributable to common stockholders:
Basic	$ (0.01)	$ 0.04	$ 0.02	$ 0.02
Diluted	$ (0.01)	$ 0.04	$ 0.02	$ 0.02

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Net (Loss) Income per Share - Schedule of Potential Common Shares Excluded from the Computation of Diluted Net (Loss) Income Per Share Attributable to Common Stockholders (Details) (Details) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	6,040	4,156	3,459	4,156
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	4,380	1,001	723	1,001
Unvested Performance-Based Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Potential common shares excluded from computation of diluted net income per share	442	983		983

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Revenue from Contracts with Customers - Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 99,219	$ 105,747	$ 296,226	$ 272,720
North America - United States
Disaggregation Of Revenue [Line Items]
Total revenue	40,671	32,036	101,534	90,825
North America - Canada
Disaggregation Of Revenue [Line Items]
Total revenue	11,087	6,428	61,875	15,170
North America
Disaggregation Of Revenue [Line Items]
Total revenue	51,758	38,464	163,409	105,995
Europe, Middle East and Africa
Disaggregation Of Revenue [Line Items]
Total revenue	6,547	6,047	19,478	27,493
Asia-Pacific - Australia
Disaggregation Of Revenue [Line Items]
Total revenue	24,329	38,889	68,527	86,848
Asia-Pacific - Other
Disaggregation Of Revenue [Line Items]
Total revenue	8,832	10,014	24,526	31,884
Asia-Pacific
Disaggregation Of Revenue [Line Items]
Total revenue	33,161	48,903	93,053	118,732
Latin America
Disaggregation Of Revenue [Line Items]
Total revenue	$ 7,753	$ 12,333	$ 20,286	$ 20,500

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Revenue from Contracts with Customers - Summary of Disaggregation of Revenue Based on Geographic Locations Determined by Customer's Shipping Address (Parenthetical) (Details) - Other than United States and Australia	9 Months Ended
	Sep. 30, 2021 Country
Disaggregation Of Revenue [Line Items]
Number of countries represents 10% or more of total revenue	0
Revenue | Geographic Concentration Risk
Disaggregation Of Revenue [Line Items]
Concentration risk percentage	10.00%

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Revenue from Contracts with Customers - Summary of Disaggregates of Revenue Based on Product Line (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Disaggregation Of Revenue [Line Items]
Total revenue	$ 99,219	$ 105,747	$ 296,226	$ 272,720
Product - Wireless
Disaggregation Of Revenue [Line Items]
Total revenue	43,070	26,825	116,081	62,992
Product - Fixed Telco
Disaggregation Of Revenue [Line Items]
Total revenue	20,187	34,005	51,209	75,756
Product - Cable
Disaggregation Of Revenue [Line Items]
Total revenue	24,495	32,911	94,729	100,879
Product
Disaggregation Of Revenue [Line Items]
Total revenue	87,752	93,741	262,019	239,627
Service - Wireless
Disaggregation Of Revenue [Line Items]
Total revenue	1,141	2,396	3,416	5,244
Service - Fixed Telco
Disaggregation Of Revenue [Line Items]
Total revenue	825	441	3,474	992
Service - Cable
Disaggregation Of Revenue [Line Items]
Total revenue	9,501	9,169	27,317	26,857
Service
Disaggregation Of Revenue [Line Items]
Total revenue	$ 11,467	$ 12,006	$ 34,207	$ 33,093

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Revenue from Contracts with Customers - 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
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation amount	$ 20,929		$ 20,929
Prepaid Expenses and Other Current Assets
Disaggregation Of Revenue [Line Items]
Short-term capitalized contract costs	96		96		$ 95
Contract assets	781		781		771
Other Assets
Disaggregation Of Revenue [Line Items]
Long-term capitalized contract costs	67		67		$ 70
Deferred Revenue
Disaggregation Of Revenue [Line Items]
Revenue	1,726	$ 9,857	13,706	$ 20,194
Selling, General and Administrative Expense
Disaggregation Of Revenue [Line Items]
Amortization of capitalized contract costs	23	76	75	524
Interest Income
Disaggregation Of Revenue [Line Items]
Other revenue	$ 6	$ 10	$ 14	$ 57

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Revenue from Contracts with Customers - Additional Information (Details1)	Sep. 30, 2021
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2021-10-01
Disaggregation Of Revenue [Line Items]
Revenue remaining performance obligation, percentage	76.00%
Revenue, remaining performance obligation, expected timing of satisfaction period	12 months
Minimum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	2 years
Maximum | Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01
Disaggregation Of Revenue [Line Items]
Revenue, remaining performance obligation, expected timing of satisfaction period	5 years

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Segment Information - Additional Information (Details)	9 Months Ended
	Sep. 30, 2021 Segment
Segment Reporting [Abstract]
Number of operating segments	1

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Segment Information - Schedule of Property and Equipment, Net by Location (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Property and equipment, net	$ 24,647	$ 28,880
United States
Segment Reporting Information [Line Items]
Property and equipment, net	17,431	20,988
China
Segment Reporting Information [Line Items]
Property and equipment, net	3,144	2,986
Australia
Segment Reporting Information [Line Items]
Property and equipment, net	2,236	2,849
Other
Segment Reporting Information [Line Items]
Property and equipment, net	$ 1,836	$ 2,057

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Related Parties - Additional Information (Details) - Rongke Xie - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Related Party Transaction [Line Items]
Compensation paid			$ 187	$ 153
Restricted Stock Units
Related Party Transaction [Line Items]
Number of shares granted				116
Vesting period			4 years
Aggregate fair value vested			$ 500
Selling, general and administrative expenses recognized	$ 28	$ 25	$ 78	$ 62

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Commitments and Contingencies - Additional Information (Details) - USD ($)	Sep. 30, 2021	Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]
Indemnification obligations material claims, outstanding	$ 0	$ 0

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Subsequent Events - Additional Information (Details) - USD ($) $ in Thousands	Oct. 25, 2021	Sep. 30, 2021	Dec. 31, 2020
Subsequent Event [Line Items]
Outstanding principal		$ 6,500	$ 6,500
Net of unamortized debt issuance costs		$ 1,079	$ 1,104
Subsequent Event | Revolving Credit Facility
Subsequent Event [Line Items]
Outstanding principal	$ 6,500
Interest expense, including amortization of debt issuance costs	7
Net of unamortized debt issuance costs	$ 6,500