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 March 31, 2020

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: 001-35480

Enphase Energy, Inc.

(Exact name of registrant as specified in its charter)

Delaware	20-4645388
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

47281 Bayside Parkway

Fremont, CA 94538

(Address of principal executive offices, including zip code)

(707) 774-7000

(Registrant’s telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock, $0.00001 par value per share	ENPH	Nasdaq Global Market

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes  ☒ 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 April 28, 2020, there were 125,211,569 shares of the registrant’s common stock outstanding, $0.00001 par value per share.

ENPHASE ENERGY, INC.

FORM 10-Q FOR THE QUARTERLY PERIOD ENDED MARCH 31, 2020

TABLE OF CONTENTS

		Page
	PART I. FINANCIAL INFORMATION
Item 1.	Financial Statements (Unaudited)	1
	Condensed Consolidated Balance Sheets	1
	Condensed Consolidated Statements of Operations	2
	Condensed Consolidated Statements of Comprehensive Income	3
	Condensed Consolidated Statements of Stockholders’ Equity	4
	Condensed Consolidated Statements of Cash Flows	5
	Notes to Condensed Consolidated Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	29
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	38
Item 4.	Controls and Procedures	39
	PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	40
Item 1A.	Risk Factors	40
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	45
Item 3.	Defaults Upon Senior Securities	45
Item 4.	Mine Safety Disclosures	45
Item 5.	Other Information	45
Item 6.	Exhibits	46
	Signature	49

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited)

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except par value)
(Unaudited)

	As of
	March 31, 2020			December 31, 2019
ASSETS
Current assets:
Cash and cash equivalents	$	549,144		$	251,409
Restricted cash	44,700			44,700
Accounts receivable, net of allowances of $374 and $564 at March 31, 2020 and December 31, 2019, respectively	95,484			145,413
Inventory	34,617			32,056
Prepaid expenses and other assets	27,752			26,079
Total current assets	751,697			499,657
Property and equipment, net	30,500			28,936
Operating lease, right of use asset	11,986			10,117
Intangible assets, net	29,332			30,579
Goodwill	24,783			24,783
Other assets	47,798			44,620
Deferred tax assets, net	86,806			74,531
Convertible notes hedge	47,885			—
Total assets	$	1,030,787		$	713,223
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	34,538		$	57,474
Accrued liabilities	49,817			47,092
Deferred revenues, current	39,022			81,783
Warranty obligations, current (includes $6,578 and $6,794 measured at fair value at March 31, 2020 and December 31, 2019, respectively)	9,678			10,078
Debt, current	100,567			2,884
Total current liabilities	233,622			199,311
Long-term liabilities:
Deferred revenues, noncurrent	106,205			100,204
Warranty obligations, noncurrent (includes $13,847 and $13,012 measured at fair value at March 31, 2020 and December 31, 2019, respectively)	27,823			27,020
Other liabilities	13,077			11,817
Debt, noncurrent (1)	295,216			102,659
Warrants liability	38,637			—
Total liabilities	714,580			441,011
Commitments and contingent liabilities (Note 9)
Stockholders’ equity:
Common stock, $0.00001 par value, 150,000 shares and 150,000 shares authorized; and 125,072 shares and 123,109 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively	1			1
Additional paid-in capital	433,542			458,315
Accumulated deficit	(116,245		)	(185,181		)
Accumulated other comprehensive loss	(1,091		)	(923		)
Total stockholders’ equity	316,207			272,212
Total liabilities and stockholders’ equity	$	1,030,787		$	713,223

(1) Debt, noncurrent balance as of March 31, 2020, includes Convertible Notes due 2025 embedded derivative balance of $45.1 million. See Note 8, “Debt,” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q for further details.

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 1

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

(In thousands, except per share data)
(Unaudited)

	Three Months Ended March 31,
	2020			2019
Net revenues	$	205,545		$	100,150
Cost of revenues	124,870			66,811
Gross profit	80,675			33,339
Operating expenses:
Research and development	11,876			8,524
Sales and marketing	11,772			7,433
General and administrative	12,315			9,880
Restructuring charges	—			368
Total operating expenses	35,963			26,205
Income from operations	44,712			7,134
Other income (expense), net
Interest income	1,091			211
Interest expense	(3,155		)	(3,751		)
Other expense, net	(924		)	(481		)
Change in fair value of derivatives	15,344			—
Total other income (expense), net	12,356			(4,021		)
Income before income taxes	57,068			3,113
Income tax benefit (provision)	11,868			(348		)
Net income	$	68,936		$	2,765
Net income per share:
Basic	$	0.56		$	0.03
Diluted	$	0.50		$	0.02
Shares used in per share calculation:
Basic	123,531			108,195
Diluted	138,104			115,863

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 2

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2020			2019
Net income	$	68,936		$	2,765
Other comprehensive loss:
Foreign currency translation adjustments	(168		)	(79		)
Comprehensive income	$	68,768		$	2,686

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 3

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER’S EQUITY

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2020			2019
Common stock and paid-in capital
Balance, beginning of period	$	458,316		$	353,336
Cumulative-effect adjustment to additional paid in capital(1)	—			26
Issuance of common stock from exercise of equity awards	1,979			1,664
Payment of withholding taxes related to net share settlement of equity awards	(34,267		)	(1,355		)
Stock-based compensation expense and other	7,515			3,353
Balance, end of period	$	433,543		$	357,024
Accumulated deficit
Balance, beginning of period	$	(185,181	)	$	(346,302	)
Cumulative-effect adjustment to accumulated deficit(1) and other	—			(26		)
Net income	68,936			2,765
Balance, end of period	$	(116,245	)	$	(343,563	)
Accumulated other comprehensive income (loss)
Balance, beginning of period	$	(923	)	$	742
Foreign currency translation adjustments	(168		)	(79		)
Balance, end of period	$	(1,091	)	$	663
Total stockholders' equity, ending balance	$	316,207		$	14,124

(1) Includes the adoption of Accounting Standards Update (“ASU”) 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting” on January 1, 2019.

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 4

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2020			2019
Cash flows from operating activities:
Net income	$	68,936		$	2,765
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,844			3,572
Provision for doubtful accounts	104			—
Non-cash interest expense	2,722			1,490
Financing fees on extinguishment of debt	—			2,152
Stock-based compensation	7,515			3,290
Change in fair value of derivatives	(15,344		)	—
Deferred income taxes	(12,500		)	—
Changes in operating assets and liabilities:
Accounts receivable	49,637			(3,266		)
Inventory	(2,560		)	3,296
Prepaid expenses and other assets	(5,009		)	(2,413		)
Accounts payable, accrued and other liabilities	(22,066		)	4,851
Warranty obligations	403			(252		)
Deferred revenues	(36,460		)	1,578
Net cash provided by operating activities	39,222			17,063
Cash flows from investing activities:
Purchases of property and equipment	(3,353		)	(658		)
Net cash used in investing activities	(3,353		)	(658		)
Cash flows from financing activities:
Issuance of convertible notes, net of issuance costs	313,011			—
Purchase of convertible note hedges	(89,056		)	—
Sale of warrants	71,552			—
Principal payments and financing fees on debt	(1,148		)	(44,731		)
Proceeds from exercise of equity awards and employee stock purchase plan	1,979			1,664
Payment of withholding taxes related to net share settlement of equity awards	(34,267		)	(1,355		)
Net cash provided by (used in) financing activities	262,071			(44,422		)
Effect of exchange rate changes on cash and cash equivalents	(205		)	(133		)
Net increase (decrease) in cash, cash equivalents, and restricted cash	297,735			(28,150		)
Cash, cash equivalents and restricted cash—Beginning of period	296,109			106,237
Cash, cash equivalents and restricted cash—End of period	$	593,844		$	78,087
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	549,144			78,087
Restricted cash	44,700			—
Total cash, cash equivalents, and restricted cash	$	593,844		$	78,087
Supplemental disclosures of non-cash investing and financing activities:
Purchases of fixed assets included in accounts payable	$	585		$	458
Convertible senior note issuance costs included in accounts payable and accrued expense	$	591		$	—

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 5

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS
(Unaudited)

1. DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Description of Business

Enphase Energy, Inc. (the “Company”) is a global energy technology company. The Company delivers smart, easy-to-use solutions that manage solar generation, storage and communication on one intelligent platform. The Company revolutionized the solar industry with its microinverter technology and produces a fully integrated solar-plus-storage solution.

Basis of Presentation and Consolidation

The accompanying condensed consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“U.S.”), or GAAP. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Unaudited Interim Financial Information

These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for interim financial reporting. In the opinion of management, these unaudited condensed consolidated financial statements reflect all adjustments, consisting of normal recurring items, considered necessary to present fairly the Company’s financial condition, results of operations, comprehensive income, stockholders’ equity and cash flows for the interim periods indicated. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the operating results for the full year.

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, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Significant estimates and assumptions reflected in the financial statements include revenue recognition, allowance for doubtful accounts, stock-based compensation, inventory valuation, accrued warranty obligations, fair value of debt derivatives, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, incremental borrowing rate for right-of-use assets and lease liability, legal contingencies, and tax valuation allowance. These estimates are based on information available as of the date of the financial statements; therefore, actual results could differ materially from management’s estimates using different assumptions or under different conditions.

The worldwide spread of the COVID-19 pandemic is expected to result in a global slowdown of economic activity which is likely to decrease demand for a broad variety of goods and services, including from the Company’s customers, while also disrupting sales channels and marketing activities for an unknown period of time until the disease is contained. The Company expects this to have a negative impact on its sales and its results of operations. In preparing the Company’s condensed consolidated financial statements in accordance with GAAP, the Company is required to make estimates, assumptions and judgments that affect the amounts reported in its financial statements and the accompanying disclosures. Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the Company to update its estimates, judgments or revise the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s financial statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 6

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Summary of Significant Accounting Policies

There have been no significant changes to the Company’s significant accounting policies in Note 2. “Summary of Significant Accounting Policies,” of the notes to consolidated financial statements included in Item 8 of the Company’s 2019 Annual Report on Form 10-K.

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” to reduce diversity in practice in accounting for the costs of implementing cloud computing arrangements that are service contracts. ASU 2018-15 allows entities to apply the guidance in the ASC 350-40, “Intangibles–Goodwill and Other–Internal-Use Software,” to determine which implementation costs are eligible to be capitalized as assets in a cloud computing arrangement that is considered a service contract. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. Entities have the option to apply the guidance prospectively to all implementation costs incurred after the date of adoption or retrospectively and are required to make certain disclosures in the interim and annual period of adoption. The Company adopted the new standard effective January 1, 2020 on a prospective basis and the adoption of this guidance did not have a material impact on its consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with a current expected credit loss (CECL) model which will result in earlier recognition of credit losses. On January 1, 2020, the Company adopted Topic 326, the measurement of expected credit losses under the CECL model is applicable to financial assets measured at amortized cost, including accounts receivable. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

2. REVENUE RECOGNITION

Disaggregated Revenue

The Company has one business activity, which is the design, manufacture and sale of solutions for the solar photovoltaic (“PV”) industry. Disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Primary geographical markets:
United States	$	179,600	$	77,686
International	25,945		22,464
Total	$	205,545	$	100,150
Timing of revenue recognition:
Products delivered at a point in time	$	194,679	$	90,400
Products and services delivered over time	10,866		9,750
Total	$	205,545	$	100,150

Enphase Energy, Inc. | 2020 Form 10-Q | 7

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Contract Balances

Receivables, and contract assets and contract liabilities from contracts with customers are as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Receivables	$	95,484	$	145,413
Short-term contract assets (Prepaid expenses and other assets)	15,928		15,055
Long-term contract assets (Other assets)	45,361		42,087
Short-term contract liabilities (Deferred revenues)	39,022		81,783
Long-term contract liabilities (Deferred revenues)	106,205		100,204

The Company receives payments from customers based upon contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include deferred product costs and commissions associated with the deferred revenue and will be amortized along with the associated revenue. The Company had no asset impairment charges related to contract assets in the three months ended March 31, 2020.

Significant changes in the balances of contract assets (prepaid expenses and other assets) during the period are as follows (in thousands):

Contract Assets
Balance on December 31, 2019	$	57,142
Amount recognized	(4,140		)
Increase	8,287
Balance as of March 31, 2020	$	61,289

Contract liabilities are recorded as deferred revenue on the accompanying condensed consolidated balance sheets and include payments received in advance of performance obligations under the contract and are realized when the associated revenue is recognized under the contract.

Significant changes in the balances of contract liabilities (deferred revenues) during the period are as follows (in thousands):

Contract Liabilities
Balance on December 31, 2019	$	181,987
Revenue recognized	(55,373		)
Increase due to billings	18,613
Balance as of March 31, 2020	$	145,227

Enphase Energy, Inc. | 2020 Form 10-Q | 8

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Remaining Performance Obligations

Estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period are as follows:

	March 31, 2020
	(In thousands)
Fiscal year:
2020 (remaining nine months)	$	30,514
2021	33,553
2022	28,527
2023	22,743
2024	17,566
Thereafter	12,324
Total	$	145,227

3. OTHER FINANCIAL INFORMATION

Accounts Receivable, Net

The Company receives payments from customers based upon contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional.

Accounts receivable, net consist of the following:

	March 31, 2020			December 31, 2019
	(In thousands)
Accounts receivable	$	95,858		$	145,977
Allowance for doubtful accounts	(374		)	(564		)
Accounts receivable, net	$	95,484		$	145,413

Allowance for Doubtful Accounts

The Company maintains allowances for doubtful accounts for uncollectible accounts receivable. Management estimates anticipated losses from doubtful accounts based on financial health of customers, days past due, collection history and existing economic conditions. The following table sets forth activities in the allowance for doubtful accounts for the periods indicated.

	March 31, 2020			December 31, 2019
	(In thousands)
Balance, at beginning of the period	$	564		$	2,138
Net charges to expenses	104			217
Write-offs, net of recoveries	(294		)	(1,791		)
Balance, at end of the period	$	374		$	564

Enphase Energy, Inc. | 2020 Form 10-Q | 9

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Inventory

Inventory consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Raw materials	$	5,018	$	4,197
Finished goods	29,599		27,859
Total inventory	$	34,617	$	32,056

Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	9,200	$	5,524
Customer rebates and sales incentives	21,601		24,198
Freight	3,734		4,908
Operating lease liabilities, current	3,511		3,170
Other	11,771		9,292
Total accrued liabilities	$	49,817	$	47,092

4. GOODWILL AND INTANGIBLE ASSETS

The Company’s goodwill and purchased intangible assets as of March 31, 2020 and December 31, 2019 are as follows:

	March 31, 2020							December 31, 2019
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	24,783	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—		$	286
Intangible assets with finite lives:
Developed technology	13,100		(3,639		)	9,461		13,100		(3,093		)	10,007
Customer relationships	23,100		(3,515		)	19,585		23,100		(2,814		)	20,286
Total purchased intangible assets	$	36,486	$	(7,154	)	$	29,332	$	36,486	$	(5,907	)	$	30,579

Enphase Energy, Inc. | 2020 Form 10-Q | 10

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Amortization expense related to finite-lived intangible assets are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	546
Customer relationships	701		636
Total amortization expense	$	1,247	$	1,182

Amortization of developed technology, patents and licensed technology is recorded to sales and marketing expense. The developed technology acquired from the Company’s acquisition of SunPower Corporation’s (“SunPower”) microinverter business in August 2018 was embedded in the microinverters that SunPower sold to its customers. The Company does not actively use the developed technology acquired from SunPower and holds the developed technology to prevent others from using it. Accordingly, the Company accounts for the developed technology as a defensive intangible asset and amortizes the associated value over a period of six years from the date of acquisition.

The master supply agreement (“MSA”) entered into with SunPower in August 2018 provides the Company with the exclusive right to supply SunPower with module level power electronics for a period of five years, with options for renewals. The exclusivity arrangement extends throughout the term of the MSA, which comprises all of the expected cash flows from the customer relationship intangible asset, and was a condition to, and was an essential part of the acquisition of SunPower’s microinverter business by the Company. As the fair value ascribed to the customer relationship intangible asset represents payments to a customer, the Company amortizes the value of the customer relationship intangible asset as a reduction to revenue using a pattern of economic benefit method over a useful life of nine years.

5. WARRANTY OBLIGATIONS

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Warranty obligations, beginning of period	$	37,098		$	31,294
Accruals for warranties issued during period	1,524			858
Changes in estimates	1,677			804
Settlements	(3,270		)	(2,296		)
Increase due to accretion expense	774			551
Other	(302		)	(169		)
Warranty obligations, end of period	37,501			31,042
Less: current portion	(9,678		)	(7,925		)
Noncurrent	$	27,823		$	23,117

6. FAIR VALUE MEASUREMENTS

The accounting guidance defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance.

Enphase Energy, Inc. | 2020 Form 10-Q | 11

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company is able to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of such assets or liabilities do not entail a significant degree of judgment.

• Level 2—Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

• Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy.

	March 31, 2020				December 31, 2019
	(In thousands)
	Level 2		Level 3		Level 2		Level 3
Assets:
Convertible notes hedge	$	47,885	$	—	$	—	$	—
Liabilities:
Debt, non-current
Convertible notes embedded derivative	45,100		—		—		—
Warrants liability	38,637		—		—		—
Warranty obligations
Current	—		6,578		—		6,794
Non-current	—		13,847		—		13,012
Total warranty obligations measured at fair value	—		20,425		—		19,806
Total liabilities measured at fair value	$	83,737	$	20,425	$	—	$	19,806

Enphase Energy, Inc. | 2020 Form 10-Q | 12

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Level 1. The Company's cash and cash equivalents primarily include highly liquid money market fund instruments and are within Level 1 of the fair value hierarchy because they are valued using quoted market prices for identical instruments in active markets. As of March 31, 2020, cash and cash equivalents balance includes money market funds of $542.2 million.

Level 2.

Convertible Notes due 2025 Derivatives

On March 9, 2020, the Company issued $320 million aggregate principal amount of 0.25% convertible senior notes due 2025 (the “Notes due 2025”) as further described in Note. 8 “Debt”. Concurrently with the issuance of the Notes due 2025, the Company entered into privately-negotiated convertible note hedge and warrant transactions which in combination are intended to reduce the potential dilution from the conversion of the Notes due 2025 and to effectively increase the overall conversion price from $81.54 to $106.94 per share. Initially, conversion of the Notes due 2025 will be settled solely in cash; however, following satisfaction of certain share reservation conditions (as defined in the relevant Indenture), conversion of the Notes due 2025 may be settled in cash, shares of the Company’s common stock or a combination of cash and shares of its common stock, at the Company’s election. The conversion option associated with the Notes due 2025 currently meets the criteria for an embedded derivative liability which required bifurcation and separate accounting. In addition, the privately-negotiated convertible note hedge and warrant transactions are also currently classified as a derivative asset and liability, respectively, on the Company’s condensed consolidated balance sheet. On the date the Company increases its authorized shares of common stock and satisfies the share reservation condition, the derivative asset and liabilities will be reclassified to additional paid-in capital as the equity classification criteria is met. Changes in the fair value of these derivatives prior to being classified in equity are reflected in other income (expense), net, in the Company’s condensed consolidated statement of operations.

The fair value of the Convertible notes embedded derivative is estimated using Binomial Lattice model and the fair value of Convertible notes hedge and Warrants liability is estimated using Black-Scholes-Merton model. Based on the fair value hierarchy, the Company classified the Convertible notes embedded derivative, Convertible notes hedge and Warrants liability derivatives (collectively the “derivatives”) to be Level 2 as significant inputs are observable, either directly or indirectly. The significant inputs and assumptions used in the models to calculate the fair value of the derivatives include the Company’s common stock price, exercise price of the derivatives, risk-free interest rate, volatility, annual coupon rate and remaining contractual term.

Notes due 2025 and Notes due 2024. The Company carries the Notes due 2025 and Notes due 2024 (as defined below) at face value less unamortized discount and issuance costs on its condensed consolidated balance sheets. The fair value of the Notes due 2025 and Notes due 2024 of $262.3 million and $252.9 million, respectively, was determined based on the closing trading prices per $100 principal amount as of the last day of trading for the period. The Company considers the fair value of the Notes due 2025 and Notes due 2024 to be a Level 2 measurement as they are not actively traded.

Level 3.

Warranty Obligations.

Fair Value Option for Warranty Obligations Related to Microinverters Sold Since January 1, 2014

The Company estimates the fair value of warranty obligations by calculating the warranty obligations in the same manner as for sales prior to January 1, 2014 and applying an expected present value technique to that result. The expected present value technique, an income approach, converts future amounts into a single current discounted amount. In addition to the key estimates of failure rates, claim rates and replacement costs, the Company used certain Level 3 inputs which are unobservable and significant to the overall fair value measurement. Such additional assumptions included a discount rate based on the Company’s credit-adjusted risk-free rate and compensation comprised of a profit element and risk premium required of a market participant to assume the obligation.

Enphase Energy, Inc. | 2020 Form 10-Q | 13

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The following table provides information regarding changes in nonfinancial liabilities related to the Company’s warranty obligations measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated.

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Balance at beginning of period	$	19,806		$	11,757
Accruals for warranties issued during period	1,524			858
Changes in estimates	615			341
Settlements	(1,993		)	(1,272		)
Increase due to accretion expense	774			551
Other	(301		)	(170		)
Balance at end of period	$	20,425		$	12,065

Quantitative and Qualitative Information about Level 3 Fair Value Measurements

As of March 31, 2020 and December 31, 2019, the significant unobservable inputs used in the fair value measurement of the Company’s liabilities designated as Level 3 are as follows:

			Percent Used (Weighted Average)
Item Measured at Fair Value	Valuation Technique	Description of Significant Unobservable Input	March 31, 2020	December 31, 2019
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	15%	14%
		Credit-adjusted risk-free rate	16%	16%

Sensitivity of Level 3 Inputs - Warranty Obligations

Each of the significant unobservable inputs is independent of the other. The profit element and risk premium are estimated based on requirements of a third-party participant willing to assume the Company’s warranty obligations. The credit‑adjusted risk‑free rate (“discount rate”) is determined by reference to the Company’s own credit standing at the fair value measurement date. Increasing the profit element and risk premium input by 100 basis points would result in a $0.2 million increase to the liability. Decreasing the profit element and risk premium by 100 basis points would result in a $0.2 million reduction of the liability. Increasing the discount rate by 100 basis points would result in a $0.9 million reduction of the liability. Decreasing the discount rate by 100 basis points would result in a $1.0 million increase to the liability.

7. RESTRUCTURING

Restructuring expense consist of the following:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Redundancy and employee severance and benefit arrangements	$	—	$	468
Lease loss reserves	—		(100		)
Total restructuring charges	$	—	$	368

Enphase Energy, Inc. | 2020 Form 10-Q | 14

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

2018 Plan

In the third quarter of 2018, the Company began implementing restructuring actions (the “2018 Plan”) to lower its operating expenses. The restructuring actions include reorganization of the Company’s global workforce, elimination of certain non-core projects and consolidation of facilities. The Company completed its restructuring activities under the 2018 Plan in 2019.

8. DEBT

The following table provides information regarding the Company’s long-term debt.

	March 31, 2020			December 31, 2019
	(In thousands)
Convertible notes
Notes due 2025	$	320,000		$	—
Less: unamortized discount and issuance costs	(75,450		)	—
Carrying amount of Notes due 2025	244,550			—
Notes due 2025 embedded derivative	45,100			—
Notes due 2024	132,000			132,000
Less: unamortized discount and issuance costs	(34,087		)	(35,815		)
Carrying amount of Notes due 2024	97,913			96,185
Notes due 2023	5,000			5,000
Less: unamortized issuance costs	(132		)	(143		)
Carrying amount of Notes due 2023	4,868			4,857
Sale of long-term financing receivable recorded as debt	3,352			4,501
Total carrying amount of debt	395,783			105,543
Less: current portion of convertible notes and long-term financing receivable recorded as debt	(100,567		)	(2,884		)
Long-term debt	$	295,216		$	102,659

Convertible Senior Notes due 2025

On March 9, 2020, the Company issued $320.0 million aggregate principal amount of the Notes due 2025. The Notes due 2025 are general unsecured obligations and bear interest at an annual rate of 0.25% per year, payable semi-annually on March 1 and September 1 of each year, beginning September 1, 2020. The Notes due 2025 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The Notes due 2025 will mature on March 1, 2025, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the notes prior to the maturity date, and no sinking fund is provided for the notes. The Notes due 2025 may be converted, under certain circumstances as described below, based on an initial conversion rate of 12.2637 shares of common stock per $1,000 principal amount (which represents an initial conversion price of $81.54 per share). The conversion rate for the Notes due 2025 will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the relevant indenture), the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its notes in connection with such make-whole fundamental change. The Company received approximately $313.0 million in net proceeds, after deducting the initial purchasers’ discount, from the issuance of the Notes due 2025.

Enphase Energy, Inc. | 2020 Form 10-Q | 15

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The Notes due 2025 may be converted prior to the close of business on the business day immediately preceding September 1, 2024, in multiples of $1,000 principal amount, at the option of the holder only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On and after September 1, 2024 until the close of business on the second scheduled trading day immediately preceding the maturity date of March 1, 2025, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon the occurrence of a fundamental change (as defined in the relevant indenture), holders may require the Company to repurchase all or a portion of their Notes due 2025 for cash at a price equal to 100% of the principal amount of the notes to be repurchased plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

As of March 31, 2020, the number of authorized and unissued shares of the Company’s common stock that are not reserved for other purposes is less than the maximum number of underlying shares that will be required to settle the Notes due 2025 into equity. Accordingly, unless and until the Company has a number of authorized shares that have not been issued or reserved for any other purpose that equals or exceeds the maximum number of underlying shares (“share reservation condition”), the Company will pay to the converting holder in respect of each $1,000 principal amount of notes being converted solely cash in an amount equal to the sum of the daily conversion values for each of the 20 consecutive trading days during the related observation period. However, following satisfaction of the share reservation condition, the Company may settle conversions of notes through payment or delivery, as the case may be, of cash, shares of the Company’s common stock or a combination of cash and shares of its common stock, at the Company’s election.

In accounting for the issuance of the Notes due 2025, on March 9, 2020, the conversion option of the Notes due 2025 was deemed an embedded derivative requiring bifurcation from the Notes due 2025 (“host contract”) and separate accounting as an embedded derivative liability, as a result of the Company not having the necessary number of authorized but unissued shares of its common stock available to settle the conversion option of the Notes due 2025 in shares. The proceeds from the Notes due 2025 are first allocated to the embedded derivative liability and the remaining proceeds are then allocated to the host contract. On March 9, 2020, the carrying amount of the embedded derivative liability of $68.7 million representing the conversion option was determined using the Binomial Lattice model and the remaining $251.3 million was allocated to the host contract. The difference between the principal amount of the Notes due 2025 and the fair value of the host contract (the “debt discount”) is amortized to interest expense using the effective interest method over the term of the Notes due 2025.

As of March 31, 2020, the embedded derivative liability is included in Debt, non-current in the condensed consolidated balance sheet and the change in fair value of derivative is included in other income (expense), net in the condensed consolidated statement of operations.

The following table presents the fair value and the change in fair value for convertible note embedded derivative (in thousands):

Convertible note embedded derivative
Fair value as of March 09, 2020	$	68,700
Change in the fair value	(23,600		)
Fair value as of March 31, 2020	$	45,100

Enphase Energy, Inc. | 2020 Form 10-Q | 16

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Debt issuance costs for the issuance of the Notes due 2025 were approximately $7.6 million, consisting of initial purchasers' discount and other issuance costs. In accounting for the transaction costs, the Company allocated the total amount incurred to the Notes due 2025 host contract. Transaction costs were recorded as debt issuance cost (presented as contra debt in the condensed consolidated balance sheet) and are being amortized to interest expense over the term of the Notes due 2025.

The following table presents the total amount of interest cost recognized relating to the Notes due 2025:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	49
Amortization of debt discount	743
Amortization of debt issuance costs	87
Total interest cost recognized	$	879

The derived effective interest rate on the Notes due 2025 host contract was determined to be 5.18%, which remain unchanged from the date of issuance. The remaining unamortized debt discount was $68.0 million as of March 31, 2020, will be amortized over approximately 4.9 years.

Notes due 2025 Hedge and Warrant Transactions

In connection with the offering of the Notes due 2025, the Company entered into privately-negotiated convertible note hedge transactions pursuant to which the Company has the option to purchase a total of approximately 3.9 million shares of its common stock (subject to anti-dilution adjustments), which is the same number of shares initially issuable upon conversion of the notes, at a price of $81.54 per share, which is the initial conversion price of the Notes due 2025. The total cost of the convertible note hedge transactions was approximately $89.1 million. The convertible note hedge transactions are expected generally to reduce potential dilution to the Company’s common stock upon any conversion of the Notes due 2025 and/or offset any cash payments the Company is required to make in excess of the principal amount of converted notes, as the case may be. As of March 31, 2020, the Company had not purchased any shares under the convertible note hedge transactions.

Additionally, the Company separately entered into privately-negotiated warrant transactions (the “Warrants”) whereby the Company sold warrants to acquire approximately 3.9 million shares of the Company’s common stock (subject to anti-dilution adjustments) at an initial strike price of $106.94 per share. The Company received aggregate proceeds of approximately $71.6 million from the sale of the Warrants. If the market value per share of the Company’s common stock, as measured under the Warrants, exceeds the strike price of the Warrants, the Warrants will have a dilutive effect on the Company’s earnings per share, unless the Company elects, subject to certain conditions, to settle the Warrants in cash. Taken together, the purchase of the convertible note hedges and the sale of the Warrants are intended to reduce potential dilution from the conversion of the Notes due 2025 and to effectively increase the overall conversion price from $81.54 to $106.94 per share. The Warrants are only exercisable on the applicable expiration dates in accordance with the agreements relating to each of the Warrants. Subject to the other terms of the Warrants, the first expiration date applicable to the Warrants is June 1, 2025, and the final expiration date applicable to the Warrants is September 23, 2025. As of March 31, 2020, the Warrants had not been exercised and remained outstanding.

For the period from March 9, 2020, the issuance date of the convertible notes hedge and warrant transactions, through March 31, 2020, the number of authorized and unissued shares of the Company’s common stock that are not reserved for other purposes is less than the maximum number of underlying shares that will be required to settle the Notes due 2025 through the delivery of shares of the Company’s common stock. Accordingly, the convertibles note hedge transactions and the warrants may only be settled on net cash settlement basis. As a result the convertible note hedge transactions and the warrants have been classified as a Convertible notes hedge asset and Warrants liability, respectively, in the condensed consolidated balance sheet and the change in fair value of derivative is included in other income (expense), net in the condensed consolidated statement of operations.

Enphase Energy, Inc. | 2020 Form 10-Q | 17

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The following table presents the fair value and the change in fair value for Convertible notes hedge and Warrants liability (in thousands):

	Convertible notes hedge			Warrants liability
	(In thousands)
Fair value as of March 09, 2020	$	89,056		$	71,552
Change in the fair value	(41,171		)	(32,915		)
Fair value as of March 31, 2020	$	47,885		$	38,637

Convertible Senior Notes due 2024

On June 5, 2019, the Company issued $132.0 million aggregate principal amount of 1.0% convertible senior notes due 2024 (the “Notes due 2024”). The Notes due 2024 are general unsecured obligations and bear interest at an annual rate of 1.0% per year, payable semi-annually on June 1 and December 1 of each year, beginning December 1, 2019. The Notes due 2024 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The Notes due 2024 will mature on June 1, 2024, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the notes prior to the maturity date, and no sinking fund is provided for the notes. The Notes due 2024 may be converted, under certain circumstances as described below, based on an initial conversion rate of 48.7781 shares of common stock per $1,000 principal amount (which represents an initial conversion price of $20.5010 per share). The conversion rate for the Notes due 2024 will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the relevant indenture), the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its notes in connection with such make-whole fundamental change. The Company received approximately $128.0 million in net proceeds, after deducting the initial purchasers’ discount, from the issuance of the Notes due 2024.

The Notes due 2024 may be converted on any day prior to the close of business on the business day immediately preceding December 1, 2023, in multiples of $1,000 principal amount, at the option of the holder only under any of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to $26.6513 (130% of the conversion price) on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On and after December 1, 2023 until the close of business on the second scheduled trading day immediately preceding the maturity date of June 1, 2024, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon the occurrence of a fundamental change (as defined in the relevant indenture), holders may require the Company to repurchase all or a portion of their Notes due 2024 for cash at a price equal to 100% of the principal amount of the notes to be repurchased plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

As of March 31, 2020, the sale price of the Company’s common stock was greater than or equal to $26.6513 (130% of the notes conversion price) for at least 20 trading days (whether consecutive or not) during a period of 30 consecutive trading days preceding the quarter-ended March 31, 2020. As a result, as of March 31, 2020, the Notes due 2024 became convertible at the holders’ option beginning on April 1, 2020 and ending June 30, 2020. Accordingly, the Company classified the net carrying amount of the Notes due 2024 of $97.9 million as Debt, current on the condensed consolidated balance sheet as of March 31, 2020.

Enphase Energy, Inc. | 2020 Form 10-Q | 18

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

In accounting for the issuance of the Notes due 2024, on June 5, 2019, the Company separated the Notes due 2024 into liability and equity components. The carrying amount of the liability component of approximately $95.6 million was calculated by using a discount rate of 7.75%, which was the Company’s borrowing rate on the date of the issuance of the notes for a similar debt instrument without the conversion feature. The carrying amount of the equity component of approximately $36.4 million, representing the conversion option, was determined by deducting the fair value of the liability component from the par value of the Notes due 2024. The equity component of the Notes due 2024 is included in additional paid-in capital in the condensed consolidated balance sheet and is not remeasured as long as it continues to meet the conditions for equity classification. The difference between the principal amount of the Notes due 2024 and the liability component (the “debt discount”) is amortized to interest expense using the effective interest method over the term of the Notes due 2024.

The Company separated the Notes due 2024 into liability and equity components, this resulted in a tax basis difference associated with the liability component that represents a temporary difference. The Company recognized the deferred taxes of $0.3 million for the tax effect of that temporary difference as an adjustment to the equity component included in additional paid-in capital in the condensed consolidated balance sheet.

Debt issuance costs for the issuance of the Notes due 2024 were approximately $4.6 million, consisting of initial purchasers' discount and other issuance costs. In accounting for the transaction costs, the Company allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes due 2024. Transaction costs attributable to the liability component were approximately $3.3 million, were recorded as debt issuance cost (presented as contra debt in the condensed consolidated balance sheet) and are being amortized to interest expense over the term of the Notes due 2024. The transaction costs attributable to the equity component were approximately $1.3 million and were netted with the equity component in stockholders’ equity. As of March 31, 2020 and December 31, 2019, the unamortized deferred issuance cost for the Notes due 2024 was $2.8 million and $2.9 million, respectively, on the condensed consolidated balance sheets.

The following table presents the total amount of interest cost recognized relating to the Notes due 2024:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	330
Amortization of debt discount	1,562
Amortization of debt issuance costs	166
Total interest cost recognized	$	2,058

The effective interest rate on the liability component Notes due 2024 was 7.75% for the three months ended March 31, 2020, which remains unchanged from the date of issuance. The remaining unamortized debt discount was $31.3 million and $32.9 million as of March 31, 2020 and December 31, 2019, respectively, will be amortized over approximately 4.2 years from March 31, 2020.

Notes due 2024 Hedge and Warrant Transactions

In connection with the offering of the Notes due 2024, the Company entered into privately-negotiated convertible note hedge transactions pursuant to which the Company has the option to purchase a total of approximately 6.4 million shares of its common stock (subject to anti-dilution adjustments), which is the same number of shares initially issuable upon conversion of the notes, at a price of $20.5010 per share, which is the initial conversion price of the Notes due 2024. The total cost of the convertible note hedge transactions was approximately $36.3 million. The convertible note hedge transactions are expected generally to reduce potential dilution to the Company’s common stock upon any conversion of the Notes due 2024 and/or offset any cash payments the Company is required to make in excess of the principal amount of converted notes, as the case may be. As of March 31, 2020, and through the date of this quarterly report, the Company had not purchased any shares under the convertible note hedge transactions.

Enphase Energy, Inc. | 2020 Form 10-Q | 19

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Additionally, the Company separately entered into privately-negotiated warrant transactions (the “Warrants”) whereby the Company sold warrants to acquire approximately 6.4 million shares of the Company’s common stock (subject to anti-dilution adjustments) at an initial strike price of $25.2320 per share. The Company received aggregate proceeds of approximately $29.8 million from the sale of the Warrants. If the market value per share of the Company’s common stock, as measured under the Warrants, exceeds the strike price of the Warrants, the Warrants will have a dilutive effect on the Company’s earnings per share, unless the Company elects, subject to certain conditions, to settle the Warrants in cash. Taken together, the purchase of the convertible note hedges and the sale of the Warrants are intended to reduce potential dilution from the conversion of the Notes due 2024 and to effectively increase the overall conversion price from $20.5010 to $25.2320 per share. The Warrants are only exercisable on the applicable expiration dates in accordance with the Warrants. Subject to the other terms of the Warrants, the first expiration date applicable to the Warrants is September 1, 2024, and the final expiration date applicable to the Warrants is April 22, 2025. As of March 31, 2020, and through the report date, the Warrants had not been exercised and remained outstanding.

Given that the transactions meet certain accounting criteria, the Notes due 2024 hedge and the warrants transactions are recorded in stockholders’ equity, and they are not accounted for as derivatives and are not remeasured each reporting period.

Convertible Senior Notes due 2023

In August 2018, the Company sold $65.0 million aggregate principal amount of 4.0% convertible senior notes due 2023 (the “Notes due 2023”) in a private placement. On May 30, 2019, the Company entered into separately and privately negotiated transactions with certain holders of the Notes due 2023 resulting in the repurchase and exchange, as of June 5, 2019, of $60.0 million aggregate principal amount of the notes in consideration for the issuance of 10,801,080 shares of common stock and separate cash payments totaling $6.0 million. As of both March 31, 2020 and December 31, 2019, $5.0 million aggregate principal amount of the Notes due 2023 remain outstanding.

The remaining outstanding Notes due 2023 are general unsecured obligations and bear interest at a rate of 4.0% per year, payable semi-annually on February 1 and August 1 of each year. The Notes due 2023 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The remaining outstanding Notes due 2023 will mature on August 1, 2023, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the remaining Notes due 2023 prior to the maturity date, and no sinking fund is provided for such notes. The remaining Notes due 2023 are convertible, at a holder’s election, in multiples of $1,000 principal amount, into shares of the Company’s common stock based on the applicable conversion rate. The initial conversion rate for such notes is 180.0180 shares of common stock per $1,000 principal amount of notes (which is equivalent to an initial conversion price of approximately $5.56 per share). The conversion rate and the corresponding conversion price are subject to adjustment upon the occurrence of certain events but will not be adjusted for any accrued and unpaid interest. Holders of the remaining Notes due 2023 who convert their notes in connection with a make-whole fundamental change (as defined in the applicable indenture) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a fundamental change, holders of the remaining Notes due 2023 may require the Company to repurchase all or a portion of their notes at a price equal to 100% of the principal amount of notes, plus any accrued and unpaid interest, including any additional interest to, but excluding, the repurchase date. Holders may convert all or any portion of their Notes due 2023 at their option at any time prior to the close of business on the business day immediately preceding the maturity date, in multiples of $1,000 principal amount.

The following table presents the amount of interest cost recognized relating to the contractual interest coupon and the amortization of debt issuance costs of the Notes due 2023.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Contractual interest expense	$	50	$	650
Amortization of debt issuance costs	10		129
Total interest costs recognized	$	60	$	779

Enphase Energy, Inc. | 2020 Form 10-Q | 20

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Sale of Long-Term Financing Receivables

The Company entered into an agreement with a third party in the fourth quarter of 2017 to sell certain current and future receivables at a discount. In December 2017, the third party made an initial purchase of receivables that resulted in net proceeds to the Company of $2.8 million. This transaction was recorded as debt on the accompanying consolidated balance sheets, and the debt balance was relieved in January 2019 as the underlying receivables were settled. During the year ended December 31, 2018, the third party made three additional purchases of receivables that resulted in total net proceeds to the Company of $5.6 million. These transactions were recorded as debt on the accompanying condensed consolidated balance sheets, and the total associated debt balance will be relieved by September 2021 as the underlying receivables are settled.

9. COMMITMENTS AND CONTINGENT LIABILITIES

Operating Leases

The Company leases office facilities under noncancelable operating leases that expire on various dates through 2028, some of which may include options to extend the leases for up to 12 years.

The components of lease expense are presented as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Operating lease costs	$	1,222	$	499

The components of lease liabilities are presented as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Operating lease liabilities, current (Accrued liabilities)	$	3,511	$	3,170
Operating lease liabilities, noncurrent (Other liabilities)	10,972		9,542
Total operating lease liabilities	$	14,483	$	12,712
Supplemental lease information:
Weighted average remaining lease term	5.6 years		5.5 years
Weighted average discount rate	8.3%		8.6%

Supplemental cash flow and other information related to operating leases, are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,014	$	737
Non-cash investing activities:
Lease liabilities arising from obtaining right-of-use assets	$	2,941	$	—

Enphase Energy, Inc. | 2020 Form 10-Q | 21

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Undiscounted cash flows of operating lease liabilities as of March 31, 2020 are as follows:

	Lease Amounts
	(In thousands)
Year:
2020 (remaining nine months)	$	3,432
2021	4,651
2022	3,337
2023	2,619
2024	1,415
2025 and thereafter	1,902
Total lease payments	17,356
Less: imputed lease interest	(2,873		)
Total lease liabilities	$	14,483

Purchase Obligations

The Company has contractual obligations related to component inventory that its primary contract manufacturer procures on its behalf in accordance with its production forecast as well as other inventory related purchase commitments. As of March 31, 2020, these purchase obligations totaled approximately $95.6 million.

Letter of Credits

As of both March 31, 2020 and December 31, 2019, the Company had a standby letter of credit in the aggregate amount of $44.7 million, primarily in connection with one of its customer contracts. The letter of credit served as a performance security for product delivered to the customer during the three months ended March 31, 2020 and expired on April 30, 2020. The Company had collateralized under the letter of credit a certificate of deposit of $44.7 million. No amounts have been drawn against this letter of credit.

Litigation

From time-to-time, the Company may be involved in litigation relating to claims arising out of its operations. The Company is not currently involved in any material legal proceedings; however, the Company may be involved in material legal proceedings in the future. Such matters are subject to uncertainty and there can be no assurance that such legal proceedings will not have a material effect on its business, results of operations, financial position or cash flows.

10. STOCK-BASED COMPENSATION

Enphase Energy, Inc. | 2020 Form 10-Q | 22

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Stock-based Compensation Expense

Stock-based compensation expense for all stock-based awards expected to vest is measured at fair value on the date of grant and recognized ratably over the requisite service period. The following table summarizes the components of total stock-based compensation expense included in the condensed consolidated statements of operations for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cost of revenues	$	606	$	231
Research and development	1,919		716
Sales and marketing	1,942		999
General and administrative	3,048		1,288
Restructuring	—		55
Total	$	7,515	$	3,289

The following table summarizes the various types of stock-based compensation expense for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Stock options, RSUs, and PSUs	$	7,077	$	3,222
Employee stock purchase plan	438		67
Total	$	7,515	$	3,289

As of March 31, 2020, there was approximately $40.6 million of total unrecognized stock-based compensation expense related to unvested equity awards, which are expected to be recognized over a weighted-average period of 2.8 years.

Valuation of Equity Awards

Stock Options

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model. No options were granted during the three months ended March 31, 2020 and 2019.

Restricted Stock Units

The fair value of the Company’s restricted stock units (“RSU”) awards granted is based upon the closing price of the Company’s stock price on the date of grant.

Performance Stock Units

The fair value of the Company’s non-market performance stock units (“PSU”) awards granted was based upon the closing price of the Company’s stock price on the date of grant. The fair value of awards of the Company’s PSU awards containing market conditions was determined using a Monte Carlo simulation model based upon the terms of the conditions, the expected volatility of the underlying security, and other relevant factors.

Enphase Energy, Inc. | 2020 Form 10-Q | 23

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Equity Awards Activity

Stock Options

The following is a summary of stock option activity.

	Number of Shares Outstanding		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,097		$	2.18
Granted	—		—
Exercised	(541	)	2.58			$	28,263
Canceled	(73	)	7.44
Outstanding at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Vested and expected to vest at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Exercisable at March 31, 2020	2,518		$	2.22	4.1	$	75,706

(1) The intrinsic value of options exercised is based upon the value of the Company’s stock at exercise. The intrinsic value of options outstanding, vested and expected to vest, and exercisable as of March 31, 2020 is based on the closing price of the Company’s stock fair value on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

The following table summarizes information about stock options outstanding at March 31, 2020.

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number of Shares	Weighted- Average Remaining Life	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
	(In thousands)	(Years)			(In thousands)
$0.70 —– $1.11	751	4.8	$	0.82	565	$	0.80
$1.29 —– $1.29	1,000	4.5	1.29		625	1.29
$1.31 —– $1.31	1,037	4.0	1.31		765	1.31
$1.37 —– $12.57	653	3.3	4.78		527	5.34
$14.58 —– $14.58	42	6.1	14.58		36	14.58
Total	3,483	4.2	$	2.01	2,518	$	2.22

Enphase Energy, Inc. | 2020 Form 10-Q | 24

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Restricted Stock Units

The following is a summary of RSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,263		$	7.19
Granted	552		31.34
Vested	(951	)	6.13			$	34,095
Canceled	(34	)	16.92
Outstanding at March 31, 2020	3,830		$	10.85	1.3	$	123,672
Expected to vest at March 31, 2020	3,830		$	10.63	1.3	$	114,306

(1) The intrinsic value of RSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of RSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

Performance Stock Units

The following is a summary of PSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	955		$	9.83
Granted	482		11.52
Vested	(1,410	)	10.41			$	50,938
Canceled	—		—
Outstanding at March 31, 2020	27		$	4.40	0	$	872

(1) The intrinsic value of PSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of PSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

11. INCOME TAXES

For the three months ended March 31, 2020, the Company’s income tax benefit of $11.9 million on income before income taxes of $57.1 million, calculated using the annualized effective tax rate method, was primarily due to tax deduction from employee stock compensation as a discrete event in the three months ended March 31, 2020, partially offset by projected tax expense in the United States (U.S.) and foreign jurisdictions that are profitable. For the three months ended March 31, 2019, the Company’s income tax provision of $0.3 million on income before income taxes of $3.1 million, calculated using the discrete tax approach, was primarily related to income taxes attributable to its foreign operations.

For the three months ended March 31, 2020, in accordance with FASB guidance for interim reporting of income tax, the Company has computed its provision for income taxes based on a projected annual effective tax rate while excluding loss jurisdictions which cannot be benefited.

Enphase Energy, Inc. | 2020 Form 10-Q | 25

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The Company used the discrete tax approach in calculating the tax expense for the three months ended March 31, 2019 due to the fact that a relatively small change in the Company’s projected pre-tax net income (loss) could result in a volatile effective tax rate. Under the discrete method, the Company determines its tax (expense) benefit based upon actual results as if the interim period was an annual period. The tax provision recorded was primarily related to income taxes attributable to its foreign operations.

12. NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share is computed in a similar manner, but it also includes the effect of potential common shares outstanding during the period, when dilutive. Potential common shares include Stock Options, RSUs, PSUs, shares to be purchased under the Company’s ESPP, the Notes due 2023, the Notes due 2024 and warrants issued in conjunction with the Notes due 2024. Until the Company’s authorized shares of common stock increases to satisfy the share reservation condition, the Notes due 2025 and warrants issued in conjunction with the Notes due 2025 must be settled in cash, and therefore excluded from shares used in diluted per share amounts.

The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method for stock options, RSUs, PSUs, Notes due 2024, warrants issued in conjunction with the Notes due 2024 and shares to be purchased under the ESPP, and by application of the if-converted method for the Notes due 2023. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income per share.

Enphase Energy, Inc. | 2020 Form 10-Q | 26

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

The following table presents the computation of basic and diluted net income per share for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands, except per share data)
Numerator:
Net income	$	68,936	$	2,765
Notes due 2023 interest and financing costs, net	44		—
Adjusted net income	$	68,980	$	2,765
Denominator:
Shares used in basic per share amounts:
Weighted average common shares outstanding	123,531		108,195
Shares used in diluted per share amounts:
Weighted average common shares outstanding	123,531		108,195
Effect of dilutive securities:
Employee stock-based awards	8,609		7,668
Warrants (issued in conjunction with Notes due 2024)	2,128		—
Notes due 2024	2,936		—
Notes due 2023	900		—
Weighted average common shares outstanding for diluted calculation	138,104		115,863
Basic and diluted net income per share
Net income per share, basic	$	0.56	$	0.03
Net income per share, diluted	$	0.50	$	0.02

The following outstanding shares of common stock equivalents were excluded from the calculation of the diluted net income per share attributable to common stockholders because their effect would have been antidilutive.

	Three Months Ended March 31,
	2020	2019
	(In thousands)
Employee stock options	—	112
RSUs and PSUs	—	91
Notes due 2023	—	11,701
Total	—	11,904

Diluted earnings per share for the three months ended March 31, 2020 and 2019 includes the dilutive effect of stock options, RSUs, PSUs, and shares to be purchased under the ESPP, the Notes due 2023, the Notes due 2024 and warrants issued in conjunction with the Notes due 2024. For the three months ended March 31, 2020, no shares were antidilutive and excluded from diluted earnings per share. For the three months ended March 31, 2019, certain common stock issuable under stock options, RSUs, PSUs and Notes due 2023 have been omitted from the diluted net income per share calculation because including such shares would have been antidilutive.

Enphase Energy, Inc. | 2020 Form 10-Q | 27

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Since the Company has the intent and ability to settle the aggregate principal amount of the Notes due 2024 in cash and any excess in shares of the Company’s common stock, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. In order to compute the dilutive effect, the number of shares included in the denominator of diluted net income per share is determined by dividing the conversion spread value of the “in-the-money” Notes due 2024 by the Company’s average share price during the period and including the resulting share amount in the diluted net income per share denominator. The conversion spread will have a dilutive impact on net income per share of common stock when the average market price of the Company’s common stock for a given period exceeds the conversion price of $20.5010 per share for the Notes due 2024. The Company’s weighted average common stock price since the issuance of the Notes due 2024 was above the conversion price, resulting in an impact on the diluted net income per share.

13. RELATED PARTY

In 2018, a member of the Company’s board of directors and one of its principal stockholders, Thurman John Rodgers, purchased $5.0 million aggregate principal amount of the Notes due 2023 in a concurrent private placement. As of both March 31, 2020 and December 31, 2019, $5.0 million aggregate principal amount of the Notes due 2023 were outstanding. See Note 8. “Debt” for additional information related to this purchase.

Enphase Energy, Inc. | 2020 Form 10-Q | 28

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

Forward-Looking Statements

The following discussion and analysis of our financial condition and results of operations should be read together with our consolidated financial statements and related notes appearing elsewhere in this Quarterly Report on Form 10-Q. This discussion contains forward-looking statements reflecting our current expectations and involves risks and uncertainties. In some cases, you can identify forward-looking statements by terminology such as “may,” “will,” “should,” “expect,” “plan,” “anticipate,” “believe,” “estimate,” “predict,” “intend,” “potential” or “continue” or the negative of these terms or other comparable terminology. Such statements, include but are not limited to statements regarding our expectations as to the impact of the COVID-19 pandemic, future financial performance, expense levels, liquidity sources, the capabilities and performance of our technology and products and planned changes, timing of new product releases, our business strategies, including anticipated trends, growth and developments in markets in which we target, the anticipated market adoption of our current and future products, performance in operations, including component supply management, product quality and customer service, and the anticipated benefits and risks relating to the transaction with SunPower Corporation. Our actual results and the timing of events may differ materially from those discussed in our forward-looking statements as a result of various factors, including those discussed below and those discussed in the section entitled “Risk Factors” included in this Quarterly Report on Form 10-Q and our Annual Report on Form 10-K for the fiscal year ended December 31, 2019.

Overview

We are a global energy technology company. We deliver smart, easy-to-use solutions that manage solar generation, storage and communication on one intelligent platform. We revolutionized the solar industry with our microinverter technology and we produce a fully integrated solar-plus-storage solution. We have shipped more than 27 million microinverters, and over 1.1 million Enphase residential and commercial systems have been deployed in more than 130 countries.

We sell our solutions primarily to distributors who resell them to solar installers. We also sell directly to large installers, OEMs, strategic partners and homeowners. Our revenue for the three months ended March 31, 2020 was positively impacted by the scheduled phase-down of the investment tax credit for solar projects under Section 48(a) (the “ITC”) of the Internal Revenue Code of 1986, as amended (the “Code”). The historical ITC percentage has decreased to 26% of the basis of a solar energy system that began construction during 2020, 22% for 2021, and zero for residential and 10% for commercial if construction begins after 2021 or if the solar energy system is placed into service after 2023. As a result, several of our customers explored opportunities to purchase products in 2019 to take advantage of safe harbor guidance from the IRS published in June 2018, allowing them to preserve the historical 30% investment tax credit for solar equipment purchased in 2019 for solar projects that are completed after December 31, 2019. Safe harbor prepayments from customers in the fourth quarter of 2019 resulted in $44.5 million of revenue recognized in the three months ended March 31, 2020 when we delivered the product.

On March 9, 2020, we issued $320.0 million aggregate principal amount of our Convertible Senior Notes due 2025 (the “Notes due 2025”) in a private placement. The Notes due 2025 are general unsecured obligations and bear interest at a rate of 0.25% per year, payable semi-annually on March 1 and September 1 of each year, beginning on September 1, 2020. The Notes due 2025 will mature on March 1, 2025, unless earlier repurchased by us or converted at the option of the holders. Further information relating to the Notes due 2025 may be found in Note 8, “Debt,” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q and below under “Liquidity and Capital Resources.”

Impact of COVID-19

In March 2020, the outbreak of COVID-19 caused by a novel strain of the coronavirus was recognized as a pandemic by the World Health Organization, and the outbreak has become increasingly widespread globally, including in the core markets in which we operate. The COVID-19 outbreak has had a notable impact on general economic conditions, including but not limited to the temporary closures of many businesses, “shelter in place” and other governmental regulations, and reduced consumer spending. The most significant near-term impacts of COVID-19 on our financial performance are a decline in sales orders as future residential and commercial system owners are canceling sales meetings with system installation professionals or postponing system installations. As the purchase of new solar energy management solutions declines as part of COVID-19’s impacts on consumer spending, many businesses through which we distribute our products are working at limited operational capacity. The extent of the impact of

Enphase Energy, Inc. | 2020 Form 10-Q | 29

COVID-19 on our future operational and financial performance will depend on various future developments, including the duration and spread of the outbreak, impact on our employees, impact on our customers, effect on our sales cycles or costs, and effect on our supply chain and vendors, all of which are uncertain and cannot be predicted, but which could have a material adverse effect on our business, results of operations or financial condition. Further information relating to the risks and uncertainties related to the ongoing COVID-19 pandemic may be found in Part II, Item 1A “Risk Factors” of this Form 10-Q, as well as in the “Risk Factors” section in our 2019 Annual Report on Form 10-K that could be heightened due to duration and spread, among other impacts of the pandemic.

Products

We design, develop, manufacture and sell home energy solutions that manage energy generation, energy storage and control and communications on one intelligent platform. We have revolutionized the solar industry by bringing a systems approach to solar technology and by pioneering a semiconductor-based microinverter that converts energy at the individual solar module level and, combined with our proprietary networking and software technologies, provides advanced energy monitoring and control. This is vastly different than a central inverter system using string modules, with or without an optimizer, approach that only converts energy of the entire array of solar modules from a single high voltage electrical unit and lacks intelligence about the energy producing capacity of the solar array.

The Enphase Home Energy Solution with IQ™ platform enables self-consumption and delivers our core value proposition of yielding more energy, simplifying design and installation, and improving system uptime and reliability. The IQ™ family of microinverters, like all of our previous microinverters, is fully compliant with NEC 2014 and 2017 rapid shutdown requirements. Unlike string inverters, this capability is built-in, with no additional equipment necessary.

Our integrated approach to energy management helps to facilitate ease of installation and optimizing a home’s energy usage.  Enphase’s Always-On connected system also provides advanced monitoring and remote maintenance capabilities. The Enphase Home Energy Solution with IQ uses a single technology platform for seamless management of the whole solution, enabling rapid commissioning with the Installer Toolkit™; consumption monitoring with our Enphase Combiner 3C™ that includes the Envoy™ Communications Gateway, Enphase Enlighten™, a cloud-based energy management platform, Enphase IQ Combiner 3C™, designed to provide an uninterrupted connectivity to Enphase Enlighten, and our Enphase AC Battery™. System owners can use Enphase Enlighten to monitor their home’s solar generation, energy storage and consumption from any web-enabled device. Unlike some of our competitors, who utilize a traditional inverter, or offer separate components of solutions, we have built-in system redundancy in both PV generation and energy storage, eliminating the risk that comes with a single-point of failure. Further, the nature of our cloud-based, monitored system allows for remote firmware and software updates, enabling cost-effective remote maintenance and ongoing utility compliance.

The Enphase IQ 7™ microinverter and Enphase IQ 7+™ microinverter, part of our seventh-generation IQ™ product family, support high-powered 60-cell and 72-cell solar modules and integrate with alternating current (“AC”) modules. Our IQ 7X™ product addresses 96-cell photovoltaic (“PV”) modules up to 400W direct current (“DC”) and with its 97.5 percent California Energy Commission (“CEC”) efficiency rating, is ideal for integration into high power modules. Our IQ 7A™ microinverters are for solar modules up to 450 W, targeting high-power residential and commercial applications. Our customers should be able to pair the IQ 7A microinverter with monofacial or bifacial solar modules, up to 450 W, from solar module manufacturers who are expected to introduce high-power variants of their products in the next three years.

AC Module products are integrated systems which allow installers to be more competitive through improved logistics, reduced installation times, faster inspection and training. We continued to make steady progress during Q1’20 with our AC module partners, including SunPower, Panasonic Corporation of North America, LONGi Solar and Solaria Corporation.

Our next-generation IQ 8™ system is based upon our Always On Enphase Ensemble™ energy management technology. This system has five components: 1) energy generation, which is accomplished with the grid-agnostic microinverter IQ 8; 2) energy storage, which is achieved by the Encharge™ battery with capacities of 3.4 kWh and 10.1 kWh; 3) microgrid interconnect device (MID); 4) communication and control via the combiner box with the Envoy gateway; and 5) Enlighten, which is the internet of things, or IoT, cloud software.

Our next-generation battery in North America is Enphase Encharge 3™ or Encharge 10™ storage systems, with usable and scalable capacity of 3.4 kWh and 10.1 kWh, respectively. Enphase Encharge™ storage systems feature Enphase embedded grid-forming microinverters that enable the Always-On capability that keeps homes powered when the grid goes down, and the ability to save money when the grid is up. These systems are compatible with both new

Enphase Energy, Inc. | 2020 Form 10-Q | 30

and existing Enphase IQ solar systems with IQ 6™ or IQ 7™ microinverters and provide a simple upgrade path for the company’s existing solar customers

Results of Operations

Net Revenues 

	Three Months Ended March 31,				Change in
	2020		2019		$		%
	(In thousands, except percentages)
Net revenues	$	205,545	$	100,150	$	105,395	105	%

Three months ended March 31, 2020 and 2019

Net revenues increased by 105% or $105.4 million for the three months ended March 31, 2020, as compared to the same period in 2019, primarily due to the 106% increase in microinverter unit volume shipped. We sold approximately 2,012 thousand microinverter units in the three months ended March 31, 2020, as compared to approximately 976 thousand units in the same period in 2019.

Cost of Revenues and Gross Profit

	Three Months Ended March 31,						Change in
	2020			2019			$		%
	(In thousands, except percentages)
Cost of revenues	$	124,870		$	66,811		$	58,059	87	%
Gross profit	80,675			33,339			47,336		142	%
Gross margin	39.2		%	33.3		%

Three months ended March 31, 2020 and 2019

Cost of revenues increased by 87% or $58.1 million for the three months ended March 31, 2020, as compared to the same period in 2019, primarily due to higher volume of microinverter units sold, partially offset by a decrease in the cost of our products as a result of our cost reduction efforts. Gross margin increased by 5.9 percentage points for the three months ended March 31, 2020, as compared to the same period in 2019. The increase in gross margin was primarily attributable to higher product margins as a result our IQ 7 family of microinverters, which has a lower cost than previous models of microinverters, as well as our overall pricing and cost management efforts. IQ 7 sales represented almost 100% of our total microinverter sales for the three months ended March 31, 2020, as compared to 94% of our total microinverter sales in in the same period in 2019.

Research and Development

	Three Months Ended March 31,						Change in
	2020			2019			$		%
	(In thousands, except percentages)
Research and development	$	11,876		$	8,524		$	3,352	39	%
Percentage of net revenues	6		%	9		%

Three months ended March 31, 2020 and 2019

Research and development expense increased by 39% or $3.4 million for the three months ended March 31, 2020, as compared to the same period in 2019. The increase is due to $2.8 million higher personnel-related expenses and $0.6 million of outside consulting and engineering services associated with the development, introduction and qualification of new products. The increase in personnel-related expenses was primarily due to hiring employees in New Zealand, India and US, increasing total compensation costs. The amount of research and development expenses may fluctuate from period to period due to the differing levels and stages of development activity.

Enphase Energy, Inc. | 2020 Form 10-Q | 31

Sales and Marketing

	Three Months Ended March 31,						Change in
	2020			2019			$		%
	(In thousands, except percentages)
Sales and marketing	$	11,772		$	7,433		$	4,339	58	%
Percentage of net revenues	6		%	7		%

Three months ended March 31, 2020 and 2019

Sales and marketing expense increased by 58% or $4.3 million for the three months ended March 31, 2020 as compared to the same period in 2019. The increase was primarily due to $3.0 million of higher personnel-related expenses as result of our efforts to improve customer experience by hiring additional employees to reduce the average wait time, as well as support our business growth in the U.S. and international expansion in Europe, and $1.2 million for a combination of higher professional services, training seminars, advertising and marketing expenditures to enable business growth.

General and Administrative

	Three Months Ended March 31,						Change in
	2020			2019			$		%
	(In thousands, except percentages)
General and administrative	$	12,315		$	9,880		$	2,435	25	%
Percentage of net revenues	6		%	10		%

Three months ended March 31, 2020 and 2019

General and administrative expense increased 25% or $2.4 million for the three months ended March 31, 2020, as compared to the same period in 2019. The increase was primarily due to $2.9 million of higher personnel-related expenses to support our business growth.

Restructuring Charges

	Three Months Ended March 31,				Change in
	2020		2019		$			%
	(In thousands, except percentages)
Restructuring charges	$	—	$	368	$	(368	)	(100)%

Three months ended March 31, 2020 and 2019

We completed our 2018 restructuring plan in 2019, hence we incurred no restructuring expenses during the three months ended March 31, 2020. Restructuring charges for three months ended March 31, 2019 primarily included $0.5 million of one-time termination benefits and other employee-related expenses, partially offset by $0.1 million reduction in lease loss reserves.

Enphase Energy, Inc. | 2020 Form 10-Q | 32

Other Income (Expense), Net

	Three Months Ended March 31,						Change in
	2020			2019			$			%
	(In thousands, except percentages)
Interest income	$	1,091		$	211		$	880		417	%
Interest expense	(3,155		)	(3,751		)	596			(16	)%
Other expense, net	(924		)	(481		)	(443		)	92	%
Change in fair value of derivatives	15,344			—			15,344			100	%
Total other income (expense), net	$	12,356		$	(4,021	)	$	16,377		407	%

Three months ended March 31, 2020 and 2019

Interest income of $1.1 million for the three months ended March 31, 2020 increased, as compared to $0.2 million in the same period in 2019, primarily due to interest earned on a higher average cash balance.

Interest expense of $3.2 million for the three months ended March 31, 2020 primarily includes $2.9 million related to the accretion of the debt discount, amortization of debt issuance cost and coupon interest incurred associated with our Notes due 2024 and Notes due 2025, $0.2 million of interest expense related to long-term financing receivable recorded as debt and interest expense of $0.1 million related to coupon interest incurred and amortization of debt issuance costs associated with our Notes due 2023. Interest expense of $3.8 million for the three months ended March 31, 2019 primarily includes interest expense of $2.8 million related to our Term Loans which were repaid in full on January 28, 2019 and $0.8 million related to coupon interest incurred and amortization of debt issuance costs associated with our Notes due 2023.

Other expense, net of $0.9 million for the three months ended March 31, 2020, relates to a net loss related to foreign currency exchange and remeasurement. Other expense, net of $0.5 million for the three months ended March 31, 2019, relates to a net loss related to foreign currency exchange and remeasurement.

The conversion option associated with the Notes due 2025 currently meets the criteria for an embedded derivative liability which required bifurcation and separate accounting. In addition, the privately-negotiated convertible note hedge and warrant transactions are also currently classified as a derivative asset and liability, respectively, on our condensed consolidated balance sheet as of March 31, 2020. On the date we increase our authorized shares of common stock and satisfy the share reservation condition, the derivative asset and liabilities will be reclassified to additional paid-in capital as the equity classification criteria is met. It is anticipated the share reservation condition will be satisfied promptly following our 2020 annual meeting of stockholders. Changes in the fair value of these derivatives prior to being classified in equity are reflected in other income (expense), net, in our condensed consolidated statement of operations. Change in fair value of derivatives of $15.3 million in the three months ended March 31, 2020 primarily includes the gain recognized for the change in fair value of our convertible notes embedded derivative and warrants of $23.6 million and $32.9 million, respectively. This gain is partially offset by a loss recognized for the change in fair value of our convertible notes hedge of $41.2 million.

Income Tax Benefit (Provision)

	Three Months Ended March 31,					Change in
	2020		2019			$		%
	(In thousands, except percentages)
Income tax benefit (provision)	$	11,868	$	(348	)	$	12,216	(3,510	)%

Three months ended March 31, 2020 and 2019

The income tax benefit of $11.9 million for the three months ended March 31, 2020, calculated using the annualized effective tax rate method, increased compared to the income tax provision of $0.3 million in 2019, calculated using the discrete tax approach, which is due to tax deduction from employee stock compensation as a discrete event in the three months ended March 31, 2020, partially offset by higher projected tax expense in the U.S. and foreign jurisdictions that are profitable in 2020 compared to 2019.

Enphase Energy, Inc. | 2020 Form 10-Q | 33

Liquidity and Capital Resources

Sources of Liquidity

As of March 31, 2020, we had $549.1 million in cash and cash equivalents, $44.7 million in restricted cash and $518.1 million in working capital. Cash, cash equivalents and restricted cash held in the U.S. were $588.5 million and consisted primarily of U.S. government money market mutual funds and both interest-bearing and non-interest-bearing deposits, with the remainder held in various foreign subsidiaries. Restricted cash represents cash held by us in the form of a certificate of deposit collateralized under a letter of credit we issued to a customer that expired on April 30, 2020. We consider amounts held outside the U.S. to be accessible and have provided for the estimated U.S. income tax liability associated with our foreign earnings. However, our liquidity may be negatively impacted if sales decline significantly for an extended period due to the impact of the COVID-19 pandemic. Further, the extent to which the COVID-19 pandemic and our precautionary measures in response thereto impact our business and liquidity will depend on future developments, which are highly uncertain and cannot be precisely predicted at this time.

Convertible Notes

Notes due 2023. As of March 31, 2020, we had $5.0 million aggregate principal amount of our Notes due 2023 outstanding. The Notes due 2023 are general unsecured obligations and bear interest at a rate of 4.00% per year, payable semi-annually on February 1 and August 1 of each year. The Notes due 2023 will mature on August 1, 2023, unless earlier repurchased by us or converted at the option of the holders.

Notes due 2024. As of March 31, 2020, we had $132.0 million aggregate principal amount of our Notes due 2024 outstanding. The Notes due 2024 are general unsecured obligations and bear interest at a rate of 1.0% per year, payable semi-annually on June 1 and December 1 of each year. The Notes due 2024 will mature on June 1, 2024, unless earlier repurchased by us or converted at the option of the holders at a conversion price of $20.50 per share.

The Notes due 2024 may be converted on any day prior to the close of business on the business day immediately preceding December 1, 2023, in multiples of $1,000 principal amount, at the option of the holder only under any of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of the our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to $26.6513 (130% of the conversion price) on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the our common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. Upon conversion of any of the notes, we will pay or deliver, as the case may be, cash, shares of common stock or a combination of cash and common stock, at our election.

As of April 1, 2020 through June 30, 2020, the Notes due 2024 may be converted because the last reported sale price of our common stock for at least 20 trading days during a period of 30 consecutive trading days ending on March 31, 2020 was greater than or equal to $26.6513 on each applicable trading day. Upon conversion of any of the notes, we will pay or deliver, as the case may be, cash, shares of common stock or a combination of cash and common stock, at our election.

In connection with the offering of the Notes due 2024, we entered into privately-negotiated convertible note hedge transactions in order to reduce the potential dilution to our common stock upon any conversion of the Notes due 2024. Also, concurrently with the offering of the Notes due 2024, we entered into privately-negotiated warrant transactions whereby we issued warrants to effectively increase the overall conversion price of Notes due 2024 from $20.5010 to $25.2320.

As of May 5, 2020, the Notes due 2024 were not converted into equity, therefore, we had not purchased any shares under the convertible note hedge and the warrants had not been exercised and remain outstanding. If holders of the Notes due 2024 exercise their right to convert the debt to equity we have asserted our intent and ability to settle the $132.0 million aggregate principal amount of the Notes due 2024 in cash.

Enphase Energy, Inc. | 2020 Form 10-Q | 34

Notes due 2025. As of March 31, 2020, we had $320.0 million aggregate principal amount of our Notes due 2025 outstanding. The Notes due 2025 are general unsecured obligations and bear interest at a rate of 0.25% per year, payable semi-annually on March 1 and September 1 of each year, beginning on September 1, 2020. The Notes due 2025 will mature on March 1, 2025, unless earlier repurchased by us or converted at the option of the holders at a conversion price of $81.54 per share.

The Notes due 2025 may be converted on any day prior to the close of business on the business day immediately preceding September 1, 2024, in multiples of $1,000 principal amount, at the option of the holder only under any of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price of the our common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to $81.5400 (130% of the conversion price) on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the our common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. Until, we satisfy share reservation condition, initially upon conversion of any of the notes, we will pay to the converting holder in respect of each $1,000 principal amount of notes being converted solely cash in an amount equal to the sum of the daily conversion values for each of the 20 consecutive trading days during the related observation period. However, following satisfaction of the share reservation condition, we will settle conversions of notes through payment or delivery, as the case may be, of cash, shares of our common stock or a combination of cash and shares of our common stock, at our election.

In connection with the offering of the Notes due 2025, we entered into privately-negotiated convertible note hedge transactions in order to reduce the potential dilution to our common stock upon any conversion of the Notes due 2025. The total cost of the convertible note hedge transactions was approximately $89.1 million. Also, concurrently with the offering of the Notes due 2025, we entered into privately-negotiated warrant transactions whereby we issued warrants to acquire shares of our common stock at a strike price of $106.9400 rather than the Notes due 2025 conversion price of $81.5400. We received approximately $71.6 million from the sale of the warrants.

As of May 5, 2020, the Notes due 2025 are not convertible into cash, therefore, we had not purchased any shares under the convertible note hedge and the warrants had not been exercised and remain outstanding. If holders of the Notes due 2025 are able to convert the debt to cash, and exercise that right, we have the ability to settle the $320.0 million aggregate principal amount of the Notes due 2025 in cash. See Note 8, “Debt,” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q for more information relating to the convertible note hedge transactions and warrants.

We believe that our existing cash, cash equivalents and restricted cash and cash flows from our operating activities will be sufficient to meet our anticipated cash needs for at least the next 12 months.

Cash Flows. The following table summarizes our cash flows for the periods presented:

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Net cash provided by operating activities	$	39,222		$	17,063
Net cash used in investing activities	(3,353		)	(658		)
Net cash provided by (used in) financing activities	262,071			(44,422		)
Effect of exchange rate changes on cash	(205		)	(133		)
Net increase in cash, cash equivalents and restricted cash	$	297,735		$	(28,150	)

Enphase Energy, Inc. | 2020 Form 10-Q | 35

Cash Flows from Operating Activities

For the three months ended March 31, 2020, net cash provided by operating activities was $39.2 million compared to net cash provided by operating activities of $17.1 million in the same period 2019, an increase of $22.1 million quarter-over-quarter. The $22.1 million increase in net cash provided by operating activities in three months ended March 31, 2020 compared to the same period in 2019, was primarily due to higher profitability in the first quarter of 2020 of $66.2 million higher net income, partially offset by higher net non-cash benefit of $24.2 million and $19.8 million changes in working capital. The higher net non-cash benefit of $24.2 million in the first quarter of 2020, compared to the same period in 2019, primarily comprises of $15.3 million of gain due to change in the fair value of derivatives, $12.5 million higher deferred income tax benefit due to benefit from vesting of RSUs at higher stock price compared to grant date stock price and $2.2 million financing fees on extinguishment of debt in the three months ended March 31, 2019 not incurred in the same period in 2020, partially offset by higher non-cash charges for $4.2 million higher stock-based compensation, $1.2 million higher non-cash interest expense primarily due to debt discount on Notes due 2024 and Notes due 2025 and $0.3 million higher depreciation and amortization.

The $19.8 million net cash used due to changes in the working capital in the first quarter of 2020, compared to the same period in 2019, was primarily due to $38.0 million decrease in deferred revenue as we delivered safe harbor orders that were prepaid in the fourth quarter of 2019, $26.9 million decrease in accounts payable due to pay off of liabilities, $5.9 million increase in inventory and $2.6 million increase in prepaid expenses and other assets, partially offset by collections of $52.9 million of accounts receivable mainly driven by our safe harbor order deliveries in the first quarter of 2020 that was prepaid in the fourth quarter of 2019.

Cash Flows from Investing Activities

For the three months ended March 31, 2020, net cash used in investing activities was $3.4 million, primarily from purchases of test and assembly equipment to expand our supply capacity and related facility improvements, and capitalized costs related to internal-use software.

For the three months ended March 31, 2019, net cash used in investing activities of $0.7 million primarily resulted from purchases of test and assembly equipment and capitalized costs related to internal-use software.

Cash Flows from Financing Activities

For the three months ended March 31, 2020, net cash provided by financing activities of $262.1 million was primarily from $313.0 million net proceeds from the issuance of our Notes due 2025, $71.6 million from sale of warrants related to our Notes due 2025, $2.0 million net proceeds from employee stock option exercises and issuance of common stock under our employee stock incentive program, partially offset by $89.1 million purchase of convertible note bond hedge related to our Notes due 2025, $34.3 million payment of employee withholding taxes related to net share settlement of equity awards and $1.1 million of repayment on sale of long-term financing receivables.

For the three months ended March 31, 2019, net cash used by financing activities of $44.4 million was primarily from $44.7 million of principal payments on debts and financing fees associated with repayment of our term loan, which was partially offset by $0.3 million in net proceeds from sales of common stock under our employee stock incentive program.

Enphase Energy, Inc. | 2020 Form 10-Q | 36

Contractual Obligations

The following table summarizes our outstanding contractual obligations as of March 31, 2020.

	Payments Due by Period
	Total		2020 (remaining nine months)		2021-2022		2023-2024		Beyond 2024
	(In thousands)
Operating leases	$	17,356	$	3,432	$	7,988	$	4,034	$	1,902
Notes due 2023 principal and interest	5,800		200		400		5,200		—
Notes due 2024 principal and interest	137,958		1,320		2,640		133,998		—
Notes due 2025 principal and interest	323,984		382		1,600		1,600		320,402
Purchase obligations (1)	95,630		95,630		—		—		—
Total	$	580,728	$	100,964	$	12,628	$	144,832	$	322,304

(1) Purchase obligations include amounts related to component inventory that our primary contract manufacturer procures on our behalf in accordance with our production forecast as well as other inventory related purchase commitments. The timing of purchases in future periods could differ materially from estimates presented above due to fluctuations in demand requirements related to varying sales levels as well as changes in economic conditions.

Off-Balance Sheet Arrangements

As of March 31, 2020, we did not have any off-balance sheet arrangements, as defined in Item 303(a)(4)(ii) of SEC Regulation S-K.

Critical Accounting Policies

Our condensed consolidated financial statements are prepared in accordance with accounting principles generally accepted in the U.S., or GAAP. In connection with the preparation of our condensed consolidated financial statements, we are required to make assumptions and estimates about future events and apply judgments that affect the reported amounts of assets, liabilities, revenue, expenses and related disclosures. We base our assumptions, estimates and judgments on historical experience, current trends and other factors that management believes to be relevant at the time our condensed consolidated financial statements are prepared. On a regular basis, we review the accounting policies, assumptions, estimates and judgments to ensure that our condensed consolidated financial statements are presented fairly and in accordance with GAAP. However, because future events and their effects cannot be determined with certainty, actual results could differ from our assumptions and estimates. To the extent that there are material differences between these estimates and actual results, our future financial statement presentation, financial condition, results of operations and cash flows will be affected.

The worldwide spread of the COVID-19 virus is expected to result in a global slowdown of economic activity which is likely to decrease demand for a broad variety of goods and services, including from our customers, while also disrupting sales channels and marketing activities for an unknown period of time until the disease is contained. We expect this to have a negative impact on our sales and our results of operations. In preparing our condensed consolidated financial statements in accordance with GAAP, we are required to make estimates, assumptions and judgments that affect the amounts reported in our financial statements and the accompanying disclosures. Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, we are not aware of any specific event or circumstance that would require us to update our estimates, judgments or revise the carrying value of our assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to our financial statements.

We consider an accounting policy to be critical if it requires an accounting estimate to be made based on assumptions about matters that are highly uncertain at the time the estimate is made, and if different estimates that reasonably could have been used, or changes in the accounting estimates that are reasonably likely to occur periodically, could materially impact the condensed consolidated financial statements.

Enphase Energy, Inc. | 2020 Form 10-Q | 37

Adoption of New and Recently Issued Accounting Pronouncements

Refer to Note 1. “Summary of Significant Accounting Policies” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q for a discussion of adoption of new and recently issued accounting pronouncements.

Item 3. Quantitative and Qualitative Disclosures About Market Risk

For quantitative and qualitative disclosures about market risk, see Item 7A, “Quantitative and Qualitative Disclosures About Market Risk” of our Annual Report on Form 10‑K for the fiscal year ended December 31, 2019. Our exposures to market risk have not changed materially since December 31, 2019, except as described below.

Market Risk

On March 9, 2020, we issued $320 million aggregate principal amount of our Notes due 2025, and entered into privately-negotiated convertible note hedge and warrant transactions, which in combination are intended to reduce the potential dilution from the conversion of the Notes due 2025 and to effectively increase the overall conversion price from $81.54 to $106.94 per share. Unless and until we have number of authorized shares that have not been issued or reserved for any other purpose that equals or exceeds the maximum number of underlying shares required to settle our Notes due 2025 into equity, the embedded conversion option associated with the Notes due 2025, convertible notes hedge and warrants liability meet the criteria for derivative accounting, and as a result, derivative financial instruments are mark-to-market at each reporting period. The volatile market conditions arising from the COVID-19 pandemic may result in significant changes in the price of the our common stock and can cause variability in the fair value of these derivative financial instruments, thus materially affect our condensed consolidated statement of operations. Change in fair value of derivatives of $15.3 million in the three months ended March 31, 2020 primarily includes the gain recognized for the change in fair value of our convertible notes embedded derivative and warrants of $23.6 million and $32.9 million, respectively, partially offset by a loss recognized for the change in fair value of our convertible notes hedge of $41.2 million.

Credit Risk

Financial instruments that subject us to concentrations of credit risk consist primarily of cash and cash equivalents, accounts receivable, and derivative financial instruments. We maintain a substantial portion of our cash balances in non-interest-bearing and interest-bearing deposits and money market accounts. The derivative financial instruments expose us to credit risk to the extent that the counterparties may be unable to meet the terms of the arrangement. We mitigate this credit risk by transacting with major financial institutions with high credit ratings. We are not required to pledge, and are not entitled to receive, cash collateral related to these derivative instruments. We do not enter into derivative contracts for trading or speculative purposes. Our net revenues are primarily concentrated among a limited number of customers. We monitor the financial condition of our customers and perform credit evaluations whenever considered necessary and maintain an allowance for doubtful accounts for estimated potential credit losses.

Enphase Energy, Inc. | 2020 Form 10-Q | 38

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, evaluated the effectiveness of our disclosure controls and procedures as of March 31, 2020. The term “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, includes, 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 the company’s management, including its principal executive and principal financial officers, as appropriate to allow timely decisions regarding required disclosure. Based on the evaluation of our disclosure controls and procedures as of March 31, 2020, our chief executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective at the reasonable assurance level.

Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

Changes in Internal Control

There were no changes in our internal control over financial reporting identified in management’s evaluation pursuant to Rules 13a-15(d) or 15d-15(d) of the Exchange Act during the period covered by this Quarterly Report that materially affected, or are reasonably likely to materially affect, our internal control over financial reporting. We have not experienced any material impact to our internal controls over financial reporting despite the fact that most of our employees are working remotely due to the COVID-19 pandemic. We are continually monitoring and assessing the impact of COVID-19 pandemic on our internal controls to minimize the impact on their design and operating effectiveness.

Enphase Energy, Inc. | 2020 Form 10-Q | 39

PART II. OTHER INFORMATION

Item 1. Legal Proceedings

From time to time, we may be involved in litigation relating to claims arising out of our operations. We are not currently involved in any material legal proceedings, and our management believes there are currently no claims or actions pending against us, the ultimate disposition of which could have a material adverse effect on our operations, financial condition, or cash flows. We may, however, be involved in material legal proceedings in the future. Such matters are subject to uncertainty and there can be no assurance that such legal proceedings will not have a material adverse effect on our business, results of operations, financial position or cash flows.

Item 1A. Risk Factors

Other than risk factors described below, there has been no material changes in our risk factors from those disclosed in Part I, Item 1A, in our Annual Report on Form 10‑K for the fiscal year ended December 31, 2019.

The current COVID-19 pandemic, as well as other actual or threatened epidemics, pandemics, outbreaks, or public health crises, may adversely affect our customers’ financial condition and our business.

The worldwide spread of the COVID-19 pandemic has resulted in a global slowdown of economic activity which is likely to decrease demand for a broad variety of goods and services, including from our customers, while also disrupting sales channels and marketing activities for an unknown period of time until the disease is contained. We expect this to have a negative impact on our sales and its results of operations, the size and duration of which we are currently unable to predict.

Among other impacts, the COVID-19 pandemic and associated governmental orders have slowed, and could continue to slow the rate of solar installations, reduce demand for our products and cause temporary or long-term disruptions in our supply chains and/or delays in the delivery of our inventory. Further, such risks could also adversely affect our customers' financial condition, resulting in reduced spending for the solar products we sell. Moreover, COVID-19 and associated governmental orders could require or cause employees to avoid our properties, which could adversely affect our ability to adequately staff and manage our businesses. “Shelter-in-place” or other such orders by governmental entities could also disrupt our operations, if employees who cannot perform their responsibilities from home, are not able to report to work.  Risks related to COVID-19 could also lead to the complete or partial closure of one or more of our facilities or operations of our customers, suppliers, vendors or other partners.

The ultimate extent of the impact of COVID-19 on our business, financial condition and results of operations will depend on future developments, including that are highly uncertain and cannot be predicted with confidence at this time, including ultimate duration of the pandemic, travel restrictions, quarantines, social distancing and business closure requirements in the U.S. and other countries, and the effectiveness of actions taken globally to contain and treat the disease. These and other potential impacts of COVID-19, could therefore materially and adversely affect our business, financial condition and results of operations.

To the extent the COVID-19 pandemic adversely affects our business and financial results, it may also have the effect of heightening many of the other risks described in this ‘‘Risk Factors’’ section as well as our risk factors from disclosed in our Annual Report on Form 10‑K for the fiscal year ended December 31, 2019, such reduced spending for solar energy systems, fluctuations in customer demand, and manufacturing and supply constraints.

The foregoing risks will also likely apply to any other future epidemic, pandemic, outbreak or other public health crisis.

Our business is affected by worldwide economic and market conditions; an unstable economy, a decline in consumer-spending levels and other adverse developments, including inflation, could lead to reduced revenues and gross margins and adversely affect our business, results of operations and liquidity.

Many economic and other factors are outside of our control, including general economic and market conditions, consumer and commercial credit availability, inflation, unemployment, consumer debt levels and other challenges affecting the global economy including the COVID-19 pandemic. Increases in the rates of unemployment, decreases in home values, decrease in new home construction, reduced access to credit and issues related to the domestic and international political situations may adversely affect consumer confidence and disposable income levels. Early societal responses to the COVID-19 pandemic have involved business closures and limited social interaction as well as work

Enphase Energy, Inc. | 2020 Form 10-Q | 40

reductions.  Low consumer confidence and disposable incomes could lead to reduced consumer spending and lower demand for our products, which are discretionary items, the purchase of which can be reduced before customers adjust their budgets for necessities. These factors could have a negative impact on our sales and cause us to increase inventory markdowns and promotional expenses, thereby reducing our gross margins and operating results.

If demand for solar energy solutions decreases as a result of the consequences of the COVID-19 pandemic, our business will suffer.

Our success depends on continued demand for solar energy solutions and the ability of solar equipment vendors to meet this demand. As a consequence of the COVID-19 pandemic, the demand for solar energy solutions may decrease, or at least not continue its growth from recent years, as a result of government orders associated with COVID-19, due to adverse worldwide economic and market conditions, or other factors. If demand for solar energy solutions decreases or does not grow, demand for our customers’ products as well as demand for our products will decrease, which would have an adverse impact on our ability to increase our revenue and grow our business.

Natural disasters, public health events, significant disruptions of information technology systems, data security breaches, or other catastrophic events could adversely affect our operations.

Our worldwide operations could be subject to natural disasters, public health events and other business disruptions, which could harm our future revenue and financial condition and increase our costs and expenses. For example, our corporate headquarters in Fremont, California is located near major earthquake fault lines and our Petaluma, California facility is near fault lines and the sites of recent catastrophic wild fires. We rely on third-party manufacturing facilities including for all product assembly and final testing of our products, which are performed at third-party manufacturing facilities, in China and Mexico. There may be conflict or uncertainty in the countries in which we operate, including public health issues (for example, the ongoing COVID-19 pandemic or an outbreak of other contagious diseases or health epidemics), safety issues, natural disasters, fire, disruptions of service from utilities, nuclear power plant accidents or general economic or political factors. Such risks could result in an increase in the cost of components, production delays, general business interruptions, delays from difficulties in obtaining export licenses for certain technology, tariffs and other barriers and restrictions, longer payment cycles, increased taxes, restrictions on the repatriation of funds and the burdens of complying with a variety of foreign laws, any of which could ultimately have a material adverse effect on our business.

Further, any terrorist attacks, material disruption to our information technology systems or any data security breaches, including due to cyber-attacks, especially any aimed at energy or communications infrastructure suppliers or our cloud-based monitoring service, could hinder or delay the development and sale or performance of our products or otherwise adverse affect us. Such significant disruptions of our, our third party vendors’ and/or business partners’ information technology systems or data security breaches, including in our remote work environment as a result of COVID-19, could adversely affect our business operations and/or result in the loss, misappropriation, and/or unauthorized access, use or disclosure of, or the prevention of access to, confidential information (including trade secrets or other intellectual property, proprietary business information and personal information), and could result in financial, legal, business and reputational harm to us. Any such event that leads to unauthorized access, use or disclosure of personal information, including personal information regarding our customers, could harm our reputation, compel us to comply with federal and/or state breach notification laws and foreign law equivalents, subject us to mandatory corrective action, require us to verify the correctness of database contents and otherwise subject us to liability under laws and regulations that protect the privacy and security of personal information, which could disrupt our business, result in increased costs or loss of revenue, and/or result in legal and financial exposure. In addition, security breaches and other inappropriate access can be difficult to detect, and any delay in identifying them may further harm us. Moreover, the prevalent use of mobile devices to access confidential information increases the risk of security breaches. While we have implemented security measures to protect our information technology systems and infrastructure, there can be no assurance that such measures will prevent service interruptions or security breaches that could adversely affect our business. In addition, failure to maintain effective internal accounting controls related to security breaches and cybersecurity in general could impact our ability to produce timely and accurate financial statements and subject us to regulatory scrutiny.

In the event that natural disasters, public health epidemics or technical catastrophes were to damage or destroy any part of our facilities or those of our contract manufacturer, destroy or disrupt vital infrastructure systems or interrupt our operations or services for any extended period of time, our business, financial condition and results of operations would be materially and adversely affected.

Enphase Energy, Inc. | 2020 Form 10-Q | 41

Conversion of our Convertible Notes may dilute the ownership interest of existing stockholders or may otherwise depress the price of our common stock.

In March 2020, we issued and sold a total of $320.0 million aggregate principal amount of our Notes due 2025.

In June 2019, we issued and sold a total of $132.0 million aggregate principal amount of our Notes due 2024.

As of March 31, 2020,

• $5.0 million aggregate principal amount of the Notes due 2023 were outstanding;

• $132.0 million aggregate principal amount of the Notes due 2024 were outstanding; and

• $320.0 million aggregate principal amount of the Notes due 2024 were outstanding (the foregoing, collectively, the “Convertible Notes”)

The conversion of some or all of the Convertible Notes may dilute the ownership interests of existing stockholders. Any sales in the public market of the common stock issuable upon such conversion could adversely affect prevailing market prices of our common stock. In addition, the existence of the Convertible Notes may encourage short selling by market participants because the conversion of the Convertible Notes could be used to satisfy short positions. In addition, the anticipated conversion of the Convertible Notes into shares of our common stock could depress the price of our common stock.

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

Our ability to make scheduled payments of the principal of, to pay interest on or to refinance our indebtedness, including the Convertible Notes, depends on our future performance, which is subject to economic, financial, competitive and other factors beyond our control. Our business may not continue to generate cash flow from operations in the future sufficient to service our debts, including the Convertible Notes, and make necessary capital expenditures. If we are unable to generate cash flow, we may be required to adopt one or more alternatives, such as selling assets, restructuring debt or obtaining additional equity capital on terms that may be onerous or highly dilutive. Our ability to refinance our indebtedness, including the Convertible Notes, will depend on the capital markets and our financial condition at such time. We may not be able to engage in any of those activities or engage in these activities on desirable terms, which could result in a default on our debt obligations, including our obligations under the Convertible Notes.

As of the reporting date, the number of authorized and unissued shares of our common stock that are not reserved for other purposes is less than the maximum number of underlying shares that will be required to settle the Notes due 2025 into equity. Accordingly, unless and until we have a number of authorized shares that have not been issued or reserved for any other purpose that equals or exceeds the maximum number of underlying shares, holder of the notes may convert the notes solely into cash based on the conversion rate and only under certain circumstances as described herein. Following satisfaction of the share reservation condition, until we elect to satisfy all or a portion of our conversion obligation through delivery of our common stock, holder of the notes are not entitled to any rights with respect to our common stock (including, without limitation, voting rights and rights to receive any dividends or other distributions on our common stock) as a result of the ownership, or upon conversion, of notes. However, the value of notes may be impacted by changes affecting our common stock.

We may not have the ability to raise the funds necessary to repurchase the Convertible Notes upon a fundamental change or to repay the Notes due 2025, Notes due 2024 and the Notes due 2023 at maturity.

Holders of our Convertible Notes will have the right to require us to repurchase all or a portion of their convertible notes upon the occurrence of a fundamental change at 100% of the principal amount of the Notes due 2025, Notes due 2024 and Notes due 2023, plus accrued and unpaid interest. Fundamental change is defined in each of the Convertible Notes Indenture entered into in connection with the financing and consists of events such as an acquisition of a majority of our outstanding common stock, an acquisition of our company or substantially all of our assets, the approval by our stockholders of a plan of liquidation or dissolution, or our common stock no longer being listed on the Nasdaq Global Select Market or the Nasdaq Global Market. We may not have enough available cash or be able to obtain financing at the time we are required to make such repurchase of the Convertible Notes.

Our ability to raise additional capital may also be adversely impacted by potential worsening global economic conditions and potential future disruptions to, and volatility in, the credit and financial markets in the U.S. and worldwide resulting from the ongoing COVID-19 pandemic. If we do not have enough available cash at the time we are required to make the required repurchases of the Convertible Notes, we may be required to undertake one or more actions,

Enphase Energy, Inc. | 2020 Form 10-Q | 42

such as selling assets, attempting to restructure the Convertible Notes or other debt, or obtaining additional capital on terms that may be onerous or highly dilutive. Any such actions could have a material adverse effect on our business, financial condition or results of operations.

The convertible note hedge and warrant transactions and/or their early termination may affect the value of our common stock.

In connection with the offering of the Notes due 2025 and Notes due 2024, we entered into privately negotiated convertible note hedge transactions pursuant to which we have the option to purchase approximately the same number of shares of our common stock initially issuable upon conversion of the Notes due 2025 and Notes due 2024, at a price approximately the same as the initial conversion price of the Notes due 2025 and Notes due 2024. These transactions are expected to reduce the potential dilution with respect to our common stock upon conversion of the Notes due 2025 and Notes due 2024. Separately, we also entered into privately negotiated warrant transactions to acquire the same number of shares of our common stock initially issuable upon conversion of the Notes due 2025 and Notes due 2024 (subject to customary anti-dilution adjustments) at an initial strike price of approximately $106.94 per share and $25.23 per share for Notes due 2025 and Notes due 2024, respectively. If the market value per share of our common stock, as measured under the warrants, exceeds the strike price of the warrants, the warrants will have a dilutive effect on the ownership interests of existing stockholders and on our earnings per share, unless we elect, subject to certain conditions, to settle the warrants in cash. However, we may not have enough available cash or be able to obtain financing at the time of settlement.

In addition, the existence of the convertible note hedge and warrant transactions may encourage purchasing and selling share of our common stock, or other of our securities and instruments, in open market and/or privately negotiated transactions in order to modify hedge positions. Any of these activities could adversely affect the value of our common stock and the value of the Notes due 2025 and Notes due 2024.

Changes in current accounting methods, standards, or regulations applicable to the Convertible Notes due 2024 and Notes due 2025 could have a material impact on our reported financial results, future financial results, future cash flows, and/or our stock price.

Under Accounting Standards Codification (“ASC”) 470-20, “Debt with Conversion and Other Options,” an entity must separately account for the host contract and conversion option associated with convertible debt instruments, such as the Notes due 2025 and Notes due 2024, that may be settled entirely or partially in cash upon conversion, in a manner that reflects the issuer’s economic interest cost. For Notes due 2024, conversion option meets the classification of an equity component, hence we have included the equity component in the additional paid-in capital section of stockholders’ equity on our condensed consolidated balance sheet at the issuance date. For Notes due 2025, conversion option meets the classification of an embedded derivative liability, and hence we have included embedded derivative liability in the Debt, non-current on our condensed consolidated balance sheet at the issuance date. We have treated the value of the equity component and embedded derivative liability as debt discount for the host contract. We are required to amortize the debt discount as non-cash interest expense over the term of the Notes due 2025 and Notes due 2024, which could adversely affect our reported or future financial results or the trading price of our common stock.

In addition, we use the treasury stock method for convertible debt instruments (such as the Notes due 2024) that may be settled entirely or partly in cash, and the effect of which is that any shares issuable upon conversion of the notes are not included in the calculation of diluted earnings per share except to the extent that the conversion value of such notes exceeds their principal amount. Under the treasury stock method, for diluted earnings per share purposes, the transaction is accounted for as if the number of shares of common stock that would be necessary to settle such excess conversion value, if we elected to settle such excess in shares, are issued. We cannot be sure that the accounting standards in the future will continue to permit use of the treasury stock method. If we are unable to use the treasury stock method in accounting for the shares issuable upon conversion of the Notes due 2024, then our diluted earnings per share will be adversely affected. Until we satisfy share reservation condition, Notes due 2025 initially upon conversion of any of the notes are solely convertible into cash.

Enphase Energy, Inc. | 2020 Form 10-Q | 43

Accounting Standards Update (“ASU”) 2016-15, “Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments,” clarifies how certain cash receipts and payments should be classified in the statement of cash flows, including the cash settlement for our Notes due 2024 and Notes due 2025. Upon cash settlement, repayment of the principal amount will be bifurcated between cash outflows for operating activities for the portion related to accreted interest attributable to debt discounts arising from the difference between the coupon interest rate and the effective interest rate, and financing activities for the remainder. This will require us to classify the $36.4 million for Notes due 2024 and $68.7 million for Notes due 2025 of accreted interest as cash used in operating activities in our consolidated statement of cash flows upon cash settlement, which could adversely affect our future cash flow from operations.

The accounting for the notes will result in our having to recognize interest expense significantly more than the stated interest rate of the notes and may result in volatility to our condensed consolidated statement of operations. Also, the accounting method for instruments that must be settled in cash, such as the note conversion option and the convertible note hedge transactions, will have a material effect on our reported financial results.

On May 20, 2020, at our Annual Meeting of shareholders, the stockholders will vote on a proposal to amend our certificate of incorporation to increase the number of authorized shares of our common stock from 150 million shares to 200 million shares. Unless we obtain such stockholder approval, we will settle any conversions of the Notes due 2025 entirely in cash. Until we obtain such stockholder approval, the ability of holders of the notes to convert the notes at their option in certain circumstances, which we refer to as the “conversion option,” will be accounted for as a derivative. In general, this require us to establish a separate initial valuation of the conversion option and to bifurcate this value from the value attributable to the balance of the notes, or the debt component. As a result, for accounting purposes, we are required to treat the notes as having been issued with a discount to their face principal amount, which is referred to as a debt discount. We are required to accrete the debt discount to interest expense over the term of the notes based on an effective interest rate for the notes in our condensed consolidated statement of operations that is in excess of the stated coupon rate of the notes. This will reduce our earnings and could adversely affect the price at which our common stock trades, but will have no effect on the amount of cash interest paid to holders or on our cash flows.

For each financial statement period over the term of the notes, a gain (or loss) will be reported in our consolidated statement of operations to the extent the valuation of the conversion option changes from the previous period. The convertible note hedge and warrants transactions will also be accounted for as derivatives. We expect gains and losses on the convertible note hedge to partially, but not entirely offset the gain (or loss) associated with changes to the valuation of the conversion option. Changes in the price of our common stock and changes in our credit risk, or the credit risk of the counterparties to the convertible note hedge and warrants transactions, can cause variability in the value of these instruments. Should there be significant changes in the price of our common stock, our credit risk, or the credit risk of such counterparties, such changes will result in valuation volatility that could materially affect our consolidated statement of operations.

Upon, receiving stockholder’s approval to increase the number of authorized shares of our common stock as described herein, then, assuming all of the other requirements for equity classification under ASC 815-40 are met, both the derivative liability and derivative asset related to the conversion option and the convertible note hedge transactions may be reclassified to equity and subsequently, provided all of the requirements for equity classification are met prospectively, no additional gain (or loss) from these derivatives will be reported in our consolidated statement of operations. However, the original issuance discount on the notes will continue to be accreted to interest expense over the remaining term of the notes.

Even if we obtain the stockholder approval described herein, we may not meet all of the other equity classification requirements at that point in time or thereafter. If we do not continue to satisfy all of the criteria required for equity classification, the conversion option and the convertible note hedge transactions will continue not to be classified as equity or may be reclassified out of equity and be subject to re-measurement. Similarly, while we expect to meet the equity classification guidance with regards to the warrants at the inception of the arrangement, if we do not continue to satisfy all of the criteria required for equity classification, the warrants too may be reclassified out of equity and become subject to re-measurement. Changes in fair value resulting from any such re-measurement will be reflected in our consolidated statement of operations.

Enphase Energy, Inc. | 2020 Form 10-Q | 44

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

Except as previously disclosed on Form 8-K, there were no unregistered sales of common stock or other equity securities during the three months ended March 31, 2020.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other

None.

Enphase Energy, Inc. | 2020 Form 10-Q | 45

Item 6. Exhibits

A list of exhibits filed with this report or incorporated herein by reference is found in the Exhibit Index below.

Enphase Energy, Inc. | 2020 Form 10-Q | 46

			Incorporation by Reference
Exhibit Number	Exhibit Description	Form	SEC File No.	Exhibit	Filing Date	Filed Herewith
3.1	Amended and Restated Certificate of Incorporation of Enphase Energy, Inc.	8-K	001-35480	3.1	4/6/2012
3.2	Certificate of Amendment of the Amended and Restated Certificate of Incorporation of Enphase Energy, Inc.	10-Q	001-35480	3.1	8/9/2017
3.3	Certificate of Amendment of the Amended and Restated Certificate of Incorporation of Enphase Energy, Inc.	10-Q	001-35480	2.1	8/6/2018
3.4	Amended and Restated Bylaws of Enphase Energy, Inc.	S-1/A	333-174925	3.5	3/12/2012
4.1	Specimen Common Stock Certificate of Enphase Energy, Inc.	S-1/A	333-174925	4.1	3/12/2012
4.2	Indenture, dated August 17, 2018, between Enphase Energy, Inc. and U.S. Bank National Association.	8-K	001-35480	4.1	8/17/2018
4.3	Form of 4.00% Convertible Senior Note due 2023 (included in Exhibit 4.2).	8-K	001-35480	4.1	8/17/2018
4.4	Indenture, dated June 5, 2019, between Enphase Energy, Inc. and U.S. Bank National Association.	8-K	001-35480	4.1	6/5/2019
4.5	Form of 1.00% Convertible Senior Note due 2024 (included in Exhibit 4.4).	8-K	001-35480	4.1	6/5/2019
4.6	Indenture, dated March 9, 2020, between Enphase Energy, Inc. and U.S. Bank National Association.	8-K	001-35480	4.1	3/9/2020
4.7	Form of 0.25% Convertible Senior Note due 2025 (included in Exhibit 4.1).	8-K	001-35480	4.2	3/9/2020
10.1	Purchase Agreement, dated March 4, 2020, by and among Enphase Energy, Inc. and Barclays Capital Inc. and Goldman Sachs & Co. LLC.	8-K	001-35480	10.1	3/9/2020
10.2	Form of Convertible Note Hedge Transaction Confirmation.	8-K	001-35480	10.2	3/9/2020
10.3	Form of Warrant Confirmation.	8-K	001-35480	10.3	3/9/2020
31.1	Certification of Chief Executive Officer pursuant to Rule 13a-14(a)/15d-14(a).					X
31.2	Certification of Chief Financial Officer pursuant to Rule 13a-14(a)/15d-14(a).					X
32.1*	Certification of Chief Executive Officer and Chief Financial Officer pursuant to 18 U.S.C. Section 1350 as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.					X
101.INS	XBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document.
101.SCH	XBRL Taxonomy Extension Schema Document.					X
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.					X
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document.					X
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.					X
101.PRE	XBRL Taxonomy Extension Presentation Document.					X
104	Cover Page Interactive Data File (formatted in Inline XBRL and contained in Exhibit 101).					X

Enphase Energy, Inc. | 2020 Form 10-Q | 47

* The certifications attached as Exhibit 32.1 accompany this quarterly report on Form 10-Q pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, and shall not be deemed “filed” by Enphase Energy, Inc. for purposes of Section 18 of the Securities Exchange Act of 1934, as amended.

Enphase Energy, Inc. | 2020 Form 10-Q | 48

SIGNATURE

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this Quarterly Report on Form 10-Q to be signed on its behalf by the undersigned, thereunto duly authorized.

Dated: May 5, 2020

ENPHASE ENERGY, INC.
By:	/s/ Eric Branderiz
	Eric Branderiz
	Executive Vice President and Chief Financial Officer
	(Duly Authorized Officer)

Enphase Energy, Inc. | 2020 Form 10-Q | 49

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Badrinarayanan Kothandaraman, certify that:

1. I have reviewed this Form 10-Q of Enphase Energy, 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 15(d)-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: May 5, 2020

/s/ BADRINARAYANAN KOTHANDARAMAN

Badrinarayanan Kothandaraman

President and Chief Executive Officer
(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Eric Branderiz, certify that:

1. I have reviewed this Form 10-Q of Enphase Energy, 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 15(d)-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: May 5, 2020

/s/ ERIC BRANDERIZ

Eric Branderiz

Executive Vice President and Chief Financial Officer
(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION

Pursuant to the requirement set forth in Rule 13a-14(b) of the Securities Exchange Act of 1934, as amended, (the “Exchange Act”) and Section 1350 of Chapter 63 of Title 18 of the United States Code (18 U.S.C. §1350), Badrinarayanan Kothandaraman, President and Chief Executive Officer of Enphase Energy, Inc. (the “Company”), and Eric Branderiz, Executive Vice President and Chief Financial Officer of the Company, each hereby certifies that, to the best of his or her knowledge:

1. The Company’s Quarterly Report on Form 10-Q for the period ended March 31, 2020, to which this Certification is attached as Exhibit 32.1 (the “Periodic Report”), fully complies with the requirements of Section 13(a) or Section 15(d) of the Exchange Act; and

2. The information contained in the Periodic Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

In Witness Whereof, the undersigned have set their hands hereto as of the 5th day of May, 2020.

/s/ BADRINARAYANAN KOTHANDARAMAN	/s/ ERIC BRANDERIZ
Badrinarayanan Kothandaraman	Eric Branderiz
President and Chief Executive Officer	Executive Vice President and Chief Financial Officer

This certification accompanies the Form 10-Q to which it relates, is not deemed filed with the Securities and Exchange Commission and is not to be incorporated by reference into any filing of Enphase Energy, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange Act of 1934, as amended (whether made before or after the date of the Form 10-Q), irrespective of any general incorporation language contained in such filing.

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RESTRUCTURING

3 Months Ended

Mar. 31, 2020

Restructuring and Related Activities [Abstract]

RESTRUCTURING

RESTRUCTURING

Restructuring expense consist of the following:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Redundancy and employee severance and benefit arrangements	$	—	$	468
Lease loss reserves	—		(100		)
Total restructuring charges	$	—	$	368

2018 Plan

In the third quarter of 2018, the Company began implementing restructuring actions (the “2018 Plan”) to lower its operating expenses. The restructuring actions include reorganization of the Company’s global workforce, elimination of certain non-core projects and consolidation of facilities. The Company completed its restructuring activities under the 2018 Plan in 2019.

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OTHER FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Other Financial Information

OTHER FINANCIAL INFORMATION

Accounts Receivable, Net

The Company receives payments from customers based upon contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional.

Accounts receivable, net consist of the following:

	March 31, 2020			December 31, 2019
	(In thousands)
Accounts receivable	$	95,858		$	145,977
Allowance for doubtful accounts	(374		)	(564		)
Accounts receivable, net	$	95,484		$	145,413

Allowance for Doubtful Accounts

The Company maintains allowances for doubtful accounts for uncollectible accounts receivable. Management estimates anticipated losses from doubtful accounts based on financial health of customers, days past due, collection history and existing economic conditions. The following table sets forth activities in the allowance for doubtful accounts for the periods indicated.

	March 31, 2020			December 31, 2019
	(In thousands)
Balance, at beginning of the period	$	564		$	2,138
Net charges to expenses	104			217
Write-offs, net of recoveries	(294		)	(1,791		)
Balance, at end of the period	$	374		$	564

Inventory

Inventory consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Raw materials	$	5,018	$	4,197
Finished goods	29,599		27,859
Total inventory	$	34,617	$	32,056

Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	9,200	$	5,524
Customer rebates and sales incentives	21,601		24,198
Freight	3,734		4,908
Operating lease liabilities, current	3,511		3,170
Other	11,771		9,292
Total accrued liabilities	$	49,817	$	47,092

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INCOME TAXES

3 Months Ended

Mar. 31, 2020

Income Tax Disclosure [Abstract]

INCOME TAXES

INCOME TAXES

For the three months ended March 31, 2020, the Company’s income tax benefit of $11.9 million on income before income taxes of $57.1 million, calculated using the annualized effective tax rate method, was primarily due to tax deduction from employee stock compensation as a discrete event in the three months ended March 31, 2020, partially offset by projected tax expense in the United States (U.S.) and foreign jurisdictions that are profitable. For the three months ended March 31, 2019, the Company’s income tax provision of $0.3 million on income before income taxes of $3.1 million, calculated using the discrete tax approach, was primarily related to income taxes attributable to its foreign operations.

For the three months ended March 31, 2020, in accordance with FASB guidance for interim reporting of income tax, the Company has computed its provision for income taxes based on a projected annual effective tax rate while excluding loss jurisdictions which cannot be benefited.

The Company used the discrete tax approach in calculating the tax expense for the three months ended March 31, 2019 due to the fact that a relatively small change in the Company’s projected pre-tax net income (loss) could result in a volatile effective tax rate. Under the discrete method, the Company determines its tax (expense) benefit based upon actual results as if the interim period was an annual period. The tax provision recorded was primarily related to income taxes attributable to its foreign operations.

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REVENUE RECOGNITION - Summary of Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Revenue from Contract with Customer [Abstract]
Receivables	$ 95,484	$ 145,413
Short-term contract assets (Prepaid expenses and other assets)	15,928	15,055
Long-term contract assets (Other assets)	45,361	42,087
Short-term contract liabilities (Deferred revenues)	39,022	81,783
Long-term contract liabilities (Deferred revenues)	$ 106,205	$ 100,204

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OTHER FINANCIAL INFORMATION - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 95,858	$ 145,977
Allowance for doubtful accounts	(374)	(564)
Accounts receivable, net	$ 95,484	$ 145,413

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DEBT - Convertible Senior Notes due 2023 (Details) - Convertible Senior Notes Due 2023		1 Months Ended
	Jun. 05, 2019 USD ($) shares	Aug. 31, 2018 USD ($) $ / shares	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Conversion shares (in shares) | shares	10,801,080
Fees paid for repurchase and exchange of convertible notes	$ 6,000,000.0
Convertible Notes
Debt Instrument [Line Items]
Debt instrument face amount		$ 65,000,000.0	$ 5,000,000.0	$ 5,000,000.0
Interest rate		4.00%
Debt converted	$ 60,000,000.0
Debt conversion price (in USD per share) | $ / shares		$ 5.56
Redemption price percentage		100.00%
Conversion ratio		0.180018

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DEBT - Schedule of Convertible Senior Notes due in 2025 (Details) - Convertible Notes - Convertible Senior Notes Due 2025 $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 49
Amortization of debt discount	743
Amortization of debt issuance costs	87
Total interest cost recognized	$ 879

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INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income taxes (benefit) provision	$ (11,868)	$ 348
Income before income taxes	$ 57,068	$ 3,113

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RELATED PARTY - Narrative (Details) - Convertible Notes - Convertible Senior Notes Due 2023 - USD ($)	Mar. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Aug. 31, 2018
Related Party Transaction [Line Items]
Debt instrument face amount	$ 5,000,000.0	$ 5,000,000.0		$ 65,000,000.0
Thurman John Rodgers
Related Party Transaction [Line Items]
Debt instrument face amount	$ 5,000,000.0	$ 5,000,000.0	$ 5,000,000.0

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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Changes in the Company's product warranty liability
Warranty obligations, beginning of period	$ 37,098	$ 31,294
Accruals for warranties issued during period	1,524	858
Changes in estimates	1,677	804
Settlements	(3,270)	(2,296)
Increase due to accretion expense	774	551
Other	(302)	(169)
Warranty obligations, end of period	37,501	31,042
Less: current portion	(9,678)	(7,925)	$ (10,078)
Noncurrent	$ 27,823	$ 23,117	$ 27,020

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FAIR VALUE MEASUREMENTS - Summary of Significant Unobservable Inputs used in the Fair Value Measurement of Liabilities Designated as Level 3 (Details) - Recurring - Level 3 - Warranty obligations for microinverters sold since January 1, 2014	Mar. 31, 2020	Dec. 31, 2019
Profit element and risk premium
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warranty obligations, measurement input	0.15	0.14
Credit-adjusted risk-free rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warranty obligations, measurement input	0.16	0.16

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STOCK-BASED COMPENSATION - Summary of Stock-based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 7,515	$ 3,289
Total unrecognized compensation cost	$ 40,600
Weighted-average recognition period for unrecognized compensation cost	2 years 9 months 18 days
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 606	231
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,919	716
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,942	999
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	3,048	1,288
Restructuring
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 0	$ 55

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COMMITMENTS AND CONTINGENT LIABILITIES - Lease Expense Components (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease costs	$ 1,222	$ 499

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STOCK-BASED COMPENSATION - Summary of Stock Options Outstanding (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2020 $ / shares shares
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, number of shares (shares) | shares	3,483
Options outstanding - weighted- average remaining life	4 years 2 months 12 days
Options outstanding - weighted- average exercise price (usd per share)	$ 2.01
Options exercisable - number of shares exercisable (shares) | shares	2,518
Options Exercisable - weighted-average exercise price (usd per share)	$ 2.22
$0.70 —– $1.11
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	0.70
Exercise price range, upper limit (usd per share)	$ 1.11
Options outstanding, number of shares (shares) | shares	751
Options outstanding - weighted- average remaining life	4 years 9 months 18 days
Options outstanding - weighted- average exercise price (usd per share)	$ 0.82
Options exercisable - number of shares exercisable (shares) | shares	565
Options Exercisable - weighted-average exercise price (usd per share)	$ 0.80
$1.29 —– $1.29
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.29
Exercise price range, upper limit (usd per share)	$ 1.29
Options outstanding, number of shares (shares) | shares	1,000
Options outstanding - weighted- average remaining life	4 years 6 months
Options outstanding - weighted- average exercise price (usd per share)	$ 1.29
Options exercisable - number of shares exercisable (shares) | shares	625
Options Exercisable - weighted-average exercise price (usd per share)	$ 1.29
$1.31 —– $1.31
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.31
Exercise price range, upper limit (usd per share)	$ 1.31
Options outstanding, number of shares (shares) | shares	1,037
Options outstanding - weighted- average remaining life	4 years
Options outstanding - weighted- average exercise price (usd per share)	$ 1.31
Options exercisable - number of shares exercisable (shares) | shares	765
Options Exercisable - weighted-average exercise price (usd per share)	$ 1.31
$1.37 —– $12.57
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	1.37
Exercise price range, upper limit (usd per share)	$ 12.57
Options outstanding, number of shares (shares) | shares	653
Options outstanding - weighted- average remaining life	3 years 3 months 18 days
Options outstanding - weighted- average exercise price (usd per share)	$ 4.78
Options exercisable - number of shares exercisable (shares) | shares	527
Options Exercisable - weighted-average exercise price (usd per share)	$ 5.34
$14.58 —– $14.58
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower limit (usd per share)	14.58
Exercise price range, upper limit (usd per share)	$ 14.58
Options outstanding, number of shares (shares) | shares	42
Options outstanding - weighted- average remaining life	6 years 1 month 6 days
Options outstanding - weighted- average exercise price (usd per share)	$ 14.58
Options exercisable - number of shares exercisable (shares) | shares	36
Options Exercisable - weighted-average exercise price (usd per share)	$ 14.58

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 68,936	$ 2,765
Other comprehensive loss:
Foreign currency translation adjustments	(168)	(79)
Comprehensive income	$ 68,768	$ 2,686

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COVER PAGE - shares	3 Months Ended
	Mar. 31, 2020	Apr. 28, 2020
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2020
Document Transition Report	false
Entity File Number	001-35480
Entity Registrant Name	Enphase Energy, Inc.
Entity Incorporation, State	DE
Entity Tax Identification Number	20-4645388
Entity Address, Address Line One	47281 Bayside Parkway
Entity Address, City or Town	Fremont
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	94538
City Area Code	707
Local Phone Number	774-7000
Title of 12(b) Security	Common Stock, $0.00001 par value per share
Trading Symbol	ENPH
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		125,211,569
Entity Central Index Key	0001463101
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q1
Current Fiscal Year End	--12-31

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REVENUE RECOGNITION

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

REVENUE RECOGNITION

REVENUE RECOGNITION

Disaggregated Revenue

The Company has one business activity, which is the design, manufacture and sale of solutions for the solar photovoltaic (“PV”) industry. Disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Primary geographical markets:
United States	$	179,600	$	77,686
International	25,945		22,464
Total	$	205,545	$	100,150
Timing of revenue recognition:
Products delivered at a point in time	$	194,679	$	90,400
Products and services delivered over time	10,866		9,750
Total	$	205,545	$	100,150

Contract Balances

Receivables, and contract assets and contract liabilities from contracts with customers are as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Receivables	$	95,484	$	145,413
Short-term contract assets (Prepaid expenses and other assets)	15,928		15,055
Long-term contract assets (Other assets)	45,361		42,087
Short-term contract liabilities (Deferred revenues)	39,022		81,783
Long-term contract liabilities (Deferred revenues)	106,205		100,204

The Company receives payments from customers based upon contractual billing schedules. Accounts receivable are recorded when the right to consideration becomes unconditional. Contract assets include deferred product costs and commissions associated with the deferred revenue and will be amortized along with the associated revenue. The Company had no asset impairment charges related to contract assets in the three months ended March 31, 2020.

Significant changes in the balances of contract assets (prepaid expenses and other assets) during the period are as follows (in thousands):

Contract Assets
Balance on December 31, 2019	$	57,142
Amount recognized	(4,140		)
Increase	8,287
Balance as of March 31, 2020	$	61,289

Contract liabilities are recorded as deferred revenue on the accompanying condensed consolidated balance sheets and include payments received in advance of performance obligations under the contract and are realized when the associated revenue is recognized under the contract.

Significant changes in the balances of contract liabilities (deferred revenues) during the period are as follows (in thousands):

Contract Liabilities
Balance on December 31, 2019	$	181,987
Revenue recognized	(55,373		)
Increase due to billings	18,613
Balance as of March 31, 2020	$	145,227

Remaining Performance Obligations

Estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period are as follows:

	March 31, 2020
	(In thousands)
Fiscal year:
2020 (remaining nine months)	$	30,514
2021	33,553
2022	28,527
2023	22,743
2024	17,566
Thereafter	12,324
Total	$	145,227

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy.

	March 31, 2020				December 31, 2019
	(In thousands)
	Level 2		Level 3		Level 2		Level 3
Assets:
Convertible notes hedge	$	47,885	$	—	$	—	$	—
Liabilities:
Debt, non-current
Convertible notes embedded derivative	45,100		—		—		—
Warrants liability	38,637		—		—		—
Warranty obligations
Current	—		6,578		—		6,794
Non-current	—		13,847		—		13,012
Total warranty obligations measured at fair value	—		20,425		—		19,806
Total liabilities measured at fair value	$	83,737	$	20,425	$	—	$	19,806

The following table presents the fair value and the change in fair value for Convertible notes hedge and Warrants liability (in thousands):

	Convertible notes hedge			Warrants liability
	(In thousands)
Fair value as of March 09, 2020	$	89,056		$	71,552
Change in the fair value	(41,171		)	(32,915		)
Fair value as of March 31, 2020	$	47,885		$	38,637

Schedule of Changes in Nonfinancial Liabilities Related to Warrant Obligations Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs

The following table provides information regarding changes in nonfinancial liabilities related to the Company’s warranty obligations measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated.

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Balance at beginning of period	$	19,806		$	11,757
Accruals for warranties issued during period	1,524			858
Changes in estimates	615			341
Settlements	(1,993		)	(1,272		)
Increase due to accretion expense	774			551
Other	(301		)	(170		)
Balance at end of period	$	20,425		$	12,065

Summary of Significant Unobservable Inputs used in the Fair Value Measurement of Liabilities Designated as Level 3

As of March 31, 2020 and December 31, 2019, the significant unobservable inputs used in the fair value measurement of the Company’s liabilities designated as Level 3 are as follows:

			Percent Used (Weighted Average)
Item Measured at Fair Value	Valuation Technique	Description of Significant Unobservable Input	March 31, 2020	December 31, 2019
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	15%	14%
		Credit-adjusted risk-free rate	16%	16%

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REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 31, 2020

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregation

Disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Primary geographical markets:
United States	$	179,600	$	77,686
International	25,945		22,464
Total	$	205,545	$	100,150
Timing of revenue recognition:
Products delivered at a point in time	$	194,679	$	90,400
Products and services delivered over time	10,866		9,750
Total	$	205,545	$	100,150

Summary of Contract Assets and Contract Liabilities, and Changes in Balances from Contracts with Customers

Receivables, and contract assets and contract liabilities from contracts with customers are as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Receivables	$	95,484	$	145,413
Short-term contract assets (Prepaid expenses and other assets)	15,928		15,055
Long-term contract assets (Other assets)	45,361		42,087
Short-term contract liabilities (Deferred revenues)	39,022		81,783
Long-term contract liabilities (Deferred revenues)	106,205		100,204

Significant changes in the balances of contract assets (prepaid expenses and other assets) during the period are as follows (in thousands):

Contract Assets
Balance on December 31, 2019	$	57,142
Amount recognized	(4,140		)
Increase	8,287
Balance as of March 31, 2020	$	61,289

Significant changes in the balances of contract liabilities (deferred revenues) during the period are as follows (in thousands):

Contract Liabilities
Balance on December 31, 2019	$	181,987
Revenue recognized	(55,373		)
Increase due to billings	18,613
Balance as of March 31, 2020	$	145,227

Summary of Estimated Revenue Expected to be Recognized in Future Periods

Estimated revenue expected to be recognized in future periods related to performance obligations that are unsatisfied or partially unsatisfied at the end of the reporting period are as follows:

	March 31, 2020
	(In thousands)
Fiscal year:
2020 (remaining nine months)	$	30,514
2021	33,553
2022	28,527
2023	22,743
2024	17,566
Thereafter	12,324
Total	$	145,227

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GOODWILL AND INTANGIBLE ASSETS - Amortization Expense (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 09, 2018	Mar. 31, 2020	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 1,247	$ 1,182
Developed technology, and patents and licensed technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		546	546
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 701	$ 636
SunPower’s
Finite-Lived Intangible Assets [Line Items]
Agreement for exclusive supplier rights, period	5 years
SunPower’s | Developed technology, and patents and licensed technology
Finite-Lived Intangible Assets [Line Items]
Amortization period for acquired intangible assets	6 years
SunPower’s | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Amortization period for acquired intangible assets	9 years

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FAIR VALUE MEASUREMENTS - Schedule of Changes in Nonfinancial Liabilities Related to Warrant Obligations Measured at Fair Value on a Recurring Basis Using Significant Unobservable Inputs (Details) - Level 3 - Recurring - Total warranty obligations measured at fair value - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 19,806	$ 11,757
Accruals for warranties issued during period	1,524	858
Changes in estimates	615	341
Settlements	(1,993)	(1,272)
Increase due to accretion expense	774	551
Other	(301)	(170)
Balance at end of period	$ 20,425	$ 12,065

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STOCK-BASED COMPENSATION - Summary of Restricted Stock Unit Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Aggregate Intrinsic Value
Share price (in usd per share)	$ 32.29
Restricted stock units
Number of Shares Outstanding
Outstanding, beginning balance (in shares) | shares	4,263
Granted (in shares) | shares	552
Vested (in shares) | shares	(951)
Canceled (in shares) | shares	(34)
Outstanding, ending balance (in shares) | shares	3,830
Number of shares outstanding, expected to vest (in shares) | shares	3,830
Weighted Average Fair Value per Share at Grant Date
Outstanding, beginning balance (in usd per share)	$ 7.19
Granted (in usd per share)	31.34
Vested (in usd per share)	6.13
Canceled (in usd per share)	16.92
Outstanding, ending balance (in usd per share)	10.85
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share)	$ 10.63
Weighted-Average Remaining Contractual Term
Weighted- Average Remaining Contractual Term	1 year 3 months 18 days
Expected to vest	1 year 3 months 18 days
Aggregate Intrinsic Value
Vested | $	$ 34,095
Outstanding | $	123,672
Aggregate intrinsic value, expected to vest | $	$ 114,306

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STOCK-BASED COMPENSATION - Summary of Stock-Based Compensation Expense Associated with Each Type of Award (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 7,515	$ 3,289
Stock options and RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	7,077	3,222
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 438	$ 67

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COMMITMENTS AND CONTINGENT LIABILITIES - Lease Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating lease liabilities, current (Accrued liabilities)	$ 3,511	$ 3,170
Operating lease liabilities, noncurrent (Other liabilities)	10,972	9,542
Total operating lease liabilities	$ 14,483	$ 12,712
Weighted average remaining lease term	5 years 7 months 6 days	5 years 6 months
Weighted average discount rate	8.30%	8.60%

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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

Description of Business

Enphase Energy, Inc. (the “Company”) is a global energy technology company. The Company delivers smart, easy-to-use solutions that manage solar generation, storage and communication on one intelligent platform. The Company revolutionized the solar industry with its microinverter technology and produces a fully integrated solar-plus-storage solution.

Basis of Presentation and Consolidation

The accompanying condensed consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“U.S.”), or GAAP. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

Unaudited Interim Financial Information

These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the SEC for interim financial reporting. In the opinion of management, these unaudited condensed consolidated financial statements reflect all adjustments, consisting of normal recurring items, considered necessary to present fairly the Company’s financial condition, results of operations, comprehensive income, stockholders’ equity and cash flows for the interim periods indicated. The results of operations for the three months ended March 31, 2020 are not necessarily indicative of the operating results for the full year.

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, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Significant estimates and assumptions reflected in the financial statements include revenue recognition, allowance for doubtful accounts, stock-based compensation, inventory valuation, accrued warranty obligations, fair value of debt derivatives, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, incremental borrowing rate for right-of-use assets and lease liability, legal contingencies, and tax valuation allowance. These estimates are based on information available as of the date of the financial statements; therefore, actual results could differ materially from management’s estimates using different assumptions or under different conditions.

The worldwide spread of the COVID-19 pandemic is expected to result in a global slowdown of economic activity which is likely to decrease demand for a broad variety of goods and services, including from the Company’s customers, while also disrupting sales channels and marketing activities for an unknown period of time until the disease is contained. The Company expects this to have a negative impact on its sales and its results of operations. In preparing the Company’s condensed consolidated financial statements in accordance with GAAP, the Company is required to make estimates, assumptions and judgments that affect the amounts reported in its financial statements and the accompanying disclosures. Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the Company to update its estimates, judgments or revise the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s financial statements.

Summary of Significant Accounting Policies

There have been no significant changes to the Company’s significant accounting policies in Note 2. “Summary of Significant Accounting Policies,” of the notes to consolidated financial statements included in Item 8 of the Company’s 2019 Annual Report on Form 10-K.

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” to reduce diversity in practice in accounting for the costs of implementing cloud computing arrangements that are service contracts. ASU 2018-15 allows entities to apply the guidance in the ASC 350-40, “Intangibles–Goodwill and Other–Internal-Use Software,” to determine which implementation costs are eligible to be capitalized as assets in a cloud computing arrangement that is considered a service contract. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. Entities have the option to apply the guidance prospectively to all implementation costs incurred after the date of adoption or retrospectively and are required to make certain disclosures in the interim and annual period of adoption. The Company adopted the new standard effective January 1, 2020 on a prospective basis and the adoption of this guidance did not have a material impact on its consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with a current expected credit loss (CECL) model which will result in earlier recognition of credit losses. On January 1, 2020, the Company adopted Topic 326, the measurement of expected credit losses under the CECL model is applicable to financial assets measured at amortized cost, including accounts receivable. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Income Statement [Abstract]
Net revenues	$ 205,545	$ 100,150
Cost of revenues	124,870	66,811
Gross profit	80,675	33,339
Operating expenses:
Research and development	11,876	8,524
Sales and marketing	11,772	7,433
General and administrative	12,315	9,880
Restructuring charges	0	368
Total operating expenses	35,963	26,205
Income from operations	44,712	7,134
Other income (expense), net
Interest income	1,091	211
Interest expense	(3,155)	(3,751)
Other expense, net	(924)	(481)
Change in fair value of derivatives	15,344	0
Total other income (expense), net	12,356	(4,021)
Income before income taxes	57,068	3,113
Income tax benefit (provision)	11,868	(348)
Net income	$ 68,936	$ 2,765
Net income per share:
Basic (in USD per share)	$ 0.56	$ 0.03
Diluted (in USD per share)	$ 0.50	$ 0.02
Shares used in per share calculation:
Basic (in shares)	123,531	108,195
Diluted (in shares)	138,104	115,863

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RESTRUCTURING (Tables)

3 Months Ended

Mar. 31, 2020

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

Restructuring expense consist of the following:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Redundancy and employee severance and benefit arrangements	$	—	$	468
Lease loss reserves	—		(100		)
Total restructuring charges	$	—	$	368

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OTHER FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts Receivable, Net

Accounts receivable, net consist of the following:

	March 31, 2020			December 31, 2019
	(In thousands)
Accounts receivable	$	95,858		$	145,977
Allowance for doubtful accounts	(374		)	(564		)
Accounts receivable, net	$	95,484		$	145,413

Schedule of Allowance for Doubtful Accounts

The following table sets forth activities in the allowance for doubtful accounts for the periods indicated.

	March 31, 2020			December 31, 2019
	(In thousands)
Balance, at beginning of the period	$	564		$	2,138
Net charges to expenses	104			217
Write-offs, net of recoveries	(294		)	(1,791		)
Balance, at end of the period	$	374		$	564

Schedule of Inventory

Inventory consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Raw materials	$	5,018	$	4,197
Finished goods	29,599		27,859
Total inventory	$	34,617	$	32,056

Schedule of Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2020		December 31, 2019
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	9,200	$	5,524
Customer rebates and sales incentives	21,601		24,198
Freight	3,734		4,908
Operating lease liabilities, current	3,511		3,170
Other	11,771		9,292
Total accrued liabilities	$	49,817	$	47,092

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NET INCOME PER SHARE

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

NET INCOME PER SHARE

NET INCOME PER SHARE

Basic net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share is computed in a similar manner, but it also includes the effect of potential common shares outstanding during the period, when dilutive. Potential common shares include Stock Options, RSUs, PSUs, shares to be purchased under the Company’s ESPP, the Notes due 2023, the Notes due 2024 and warrants issued in conjunction with the Notes due 2024. Until the Company’s authorized shares of common stock increases to satisfy the share reservation condition, the Notes due 2025 and warrants issued in conjunction with the Notes due 2025 must be settled in cash, and therefore excluded from shares used in diluted per share amounts.

The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method for stock options, RSUs, PSUs, Notes due 2024, warrants issued in conjunction with the Notes due 2024 and shares to be purchased under the ESPP, and by application of the if-converted method for the Notes due 2023. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income per share.

The following table presents the computation of basic and diluted net income per share for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands, except per share data)
Numerator:
Net income	$	68,936	$	2,765
Notes due 2023 interest and financing costs, net	44		—
Adjusted net income	$	68,980	$	2,765
Denominator:
Shares used in basic per share amounts:
Weighted average common shares outstanding	123,531		108,195
Shares used in diluted per share amounts:
Weighted average common shares outstanding	123,531		108,195
Effect of dilutive securities:
Employee stock-based awards	8,609		7,668
Warrants (issued in conjunction with Notes due 2024)	2,128		—
Notes due 2024	2,936		—
Notes due 2023	900		—
Weighted average common shares outstanding for diluted calculation	138,104		115,863
Basic and diluted net income per share
Net income per share, basic	$	0.56	$	0.03
Net income per share, diluted	$	0.50	$	0.02

The following outstanding shares of common stock equivalents were excluded from the calculation of the diluted net income per share attributable to common stockholders because their effect would have been antidilutive.

	Three Months Ended March 31,
	2020	2019
	(In thousands)
Employee stock options	—	112
RSUs and PSUs	—	91
Notes due 2023	—	11,701
Total	—	11,904

Diluted earnings per share for the three months ended March 31, 2020 and 2019 includes the dilutive effect of stock options, RSUs, PSUs, and shares to be purchased under the ESPP, the Notes due 2023, the Notes due 2024 and warrants issued in conjunction with the Notes due 2024. For the three months ended March 31, 2020, no shares were antidilutive and excluded from diluted earnings per share. For the three months ended March 31, 2019, certain common stock issuable under stock options, RSUs, PSUs and Notes due 2023 have been omitted from the diluted net income per share calculation because including such shares would have been antidilutive.

Since the Company has the intent and ability to settle the aggregate principal amount of the Notes due 2024 in cash and any excess in shares of the Company’s common stock, the Company uses the treasury stock method for calculating any potential dilutive effect of the conversion spread on diluted net income per share, if applicable. In order to compute the dilutive effect, the number of shares included in the denominator of diluted net income per share is determined by dividing the conversion spread value of the “in-the-money” Notes due 2024 by the Company’s average share price during the period and including the resulting share amount in the diluted net income per share denominator. The conversion spread will have a dilutive impact on net income per share of common stock when the average market price of the Company’s common stock for a given period exceeds the conversion price of $20.5010 per share for the Notes due 2024. The Company’s weighted average common stock price since the issuance of the Notes due 2024 was above the conversion price, resulting in an impact on the diluted net income per share.

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DEBT

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

DEBT

DEBT

The following table provides information regarding the Company’s long-term debt.

	March 31, 2020			December 31, 2019
	(In thousands)
Convertible notes
Notes due 2025	$	320,000		$	—
Less: unamortized discount and issuance costs	(75,450		)	—
Carrying amount of Notes due 2025	244,550			—
Notes due 2025 embedded derivative	45,100			—
Notes due 2024	132,000			132,000
Less: unamortized discount and issuance costs	(34,087		)	(35,815		)
Carrying amount of Notes due 2024	97,913			96,185
Notes due 2023	5,000			5,000
Less: unamortized issuance costs	(132		)	(143		)
Carrying amount of Notes due 2023	4,868			4,857
Sale of long-term financing receivable recorded as debt	3,352			4,501
Total carrying amount of debt	395,783			105,543
Less: current portion of convertible notes and long-term financing receivable recorded as debt	(100,567		)	(2,884		)
Long-term debt	$	295,216		$	102,659

Convertible Senior Notes due 2025

On March 9, 2020, the Company issued $320.0 million aggregate principal amount of the Notes due 2025. The Notes due 2025 are general unsecured obligations and bear interest at an annual rate of 0.25% per year, payable semi-annually on March 1 and September 1 of each year, beginning September 1, 2020. The Notes due 2025 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The Notes due 2025 will mature on March 1, 2025, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the notes prior to the maturity date, and no sinking fund is provided for the notes. The Notes due 2025 may be converted, under certain circumstances as described below, based on an initial conversion rate of 12.2637 shares of common stock per $1,000 principal amount (which represents an initial conversion price of $81.54 per share). The conversion rate for the Notes due 2025 will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the relevant indenture), the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its notes in connection with such make-whole fundamental change. The Company received approximately $313.0 million in net proceeds, after deducting the initial purchasers’ discount, from the issuance of the Notes due 2025.

The Notes due 2025 may be converted prior to the close of business on the business day immediately preceding September 1, 2024, in multiples of $1,000 principal amount, at the option of the holder only under the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on June 30, 2020 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On and after September 1, 2024 until the close of business on the second scheduled trading day immediately preceding the maturity date of March 1, 2025, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon the occurrence of a fundamental change (as defined in the relevant indenture), holders may require the Company to repurchase all or a portion of their Notes due 2025 for cash at a price equal to 100% of the principal amount of the notes to be repurchased plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

As of March 31, 2020, the number of authorized and unissued shares of the Company’s common stock that are not reserved for other purposes is less than the maximum number of underlying shares that will be required to settle the Notes due 2025 into equity. Accordingly, unless and until the Company has a number of authorized shares that have not been issued or reserved for any other purpose that equals or exceeds the maximum number of underlying shares (“share reservation condition”), the Company will pay to the converting holder in respect of each $1,000 principal amount of notes being converted solely cash in an amount equal to the sum of the daily conversion values for each of the 20 consecutive trading days during the related observation period. However, following satisfaction of the share reservation condition, the Company may settle conversions of notes through payment or delivery, as the case may be, of cash, shares of the Company’s common stock or a combination of cash and shares of its common stock, at the Company’s election.

In accounting for the issuance of the Notes due 2025, on March 9, 2020, the conversion option of the Notes due 2025 was deemed an embedded derivative requiring bifurcation from the Notes due 2025 (“host contract”) and separate accounting as an embedded derivative liability, as a result of the Company not having the necessary number of authorized but unissued shares of its common stock available to settle the conversion option of the Notes due 2025 in shares. The proceeds from the Notes due 2025 are first allocated to the embedded derivative liability and the remaining proceeds are then allocated to the host contract. On March 9, 2020, the carrying amount of the embedded derivative liability of $68.7 million representing the conversion option was determined using the Binomial Lattice model and the remaining $251.3 million was allocated to the host contract. The difference between the principal amount of the Notes due 2025 and the fair value of the host contract (the “debt discount”) is amortized to interest expense using the effective interest method over the term of the Notes due 2025.

As of March 31, 2020, the embedded derivative liability is included in Debt, non-current in the condensed consolidated balance sheet and the change in fair value of derivative is included in other income (expense), net in the condensed consolidated statement of operations.

The following table presents the fair value and the change in fair value for convertible note embedded derivative (in thousands):

Convertible note embedded derivative
Fair value as of March 09, 2020	$	68,700
Change in the fair value	(23,600		)
Fair value as of March 31, 2020	$	45,100

Debt issuance costs for the issuance of the Notes due 2025 were approximately $7.6 million, consisting of initial purchasers' discount and other issuance costs. In accounting for the transaction costs, the Company allocated the total amount incurred to the Notes due 2025 host contract. Transaction costs were recorded as debt issuance cost (presented as contra debt in the condensed consolidated balance sheet) and are being amortized to interest expense over the term of the Notes due 2025.

The following table presents the total amount of interest cost recognized relating to the Notes due 2025:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	49
Amortization of debt discount	743
Amortization of debt issuance costs	87
Total interest cost recognized	$	879

The derived effective interest rate on the Notes due 2025 host contract was determined to be 5.18%, which remain unchanged from the date of issuance. The remaining unamortized debt discount was $68.0 million as of March 31, 2020, will be amortized over approximately 4.9 years.

Notes due 2025 Hedge and Warrant Transactions

In connection with the offering of the Notes due 2025, the Company entered into privately-negotiated convertible note hedge transactions pursuant to which the Company has the option to purchase a total of approximately 3.9 million shares of its common stock (subject to anti-dilution adjustments), which is the same number of shares initially issuable upon conversion of the notes, at a price of $81.54 per share, which is the initial conversion price of the Notes due 2025. The total cost of the convertible note hedge transactions was approximately $89.1 million. The convertible note hedge transactions are expected generally to reduce potential dilution to the Company’s common stock upon any conversion of the Notes due 2025 and/or offset any cash payments the Company is required to make in excess of the principal amount of converted notes, as the case may be. As of March 31, 2020, the Company had not purchased any shares under the convertible note hedge transactions.

Additionally, the Company separately entered into privately-negotiated warrant transactions (the “Warrants”) whereby the Company sold warrants to acquire approximately 3.9 million shares of the Company’s common stock (subject to anti-dilution adjustments) at an initial strike price of $106.94 per share. The Company received aggregate proceeds of approximately $71.6 million from the sale of the Warrants. If the market value per share of the Company’s common stock, as measured under the Warrants, exceeds the strike price of the Warrants, the Warrants will have a dilutive effect on the Company’s earnings per share, unless the Company elects, subject to certain conditions, to settle the Warrants in cash. Taken together, the purchase of the convertible note hedges and the sale of the Warrants are intended to reduce potential dilution from the conversion of the Notes due 2025 and to effectively increase the overall conversion price from $81.54 to $106.94 per share. The Warrants are only exercisable on the applicable expiration dates in accordance with the agreements relating to each of the Warrants. Subject to the other terms of the Warrants, the first expiration date applicable to the Warrants is June 1, 2025, and the final expiration date applicable to the Warrants is September 23, 2025. As of March 31, 2020, the Warrants had not been exercised and remained outstanding.

For the period from March 9, 2020, the issuance date of the convertible notes hedge and warrant transactions, through March 31, 2020, the number of authorized and unissued shares of the Company’s common stock that are not reserved for other purposes is less than the maximum number of underlying shares that will be required to settle the Notes due 2025 through the delivery of shares of the Company’s common stock. Accordingly, the convertibles note hedge transactions and the warrants may only be settled on net cash settlement basis. As a result the convertible note hedge transactions and the warrants have been classified as a Convertible notes hedge asset and Warrants liability, respectively, in the condensed consolidated balance sheet and the change in fair value of derivative is included in other income (expense), net in the condensed consolidated statement of operations.

The following table presents the fair value and the change in fair value for Convertible notes hedge and Warrants liability (in thousands):

	Convertible notes hedge			Warrants liability
	(In thousands)
Fair value as of March 09, 2020	$	89,056		$	71,552
Change in the fair value	(41,171		)	(32,915		)
Fair value as of March 31, 2020	$	47,885		$	38,637

Convertible Senior Notes due 2024

On June 5, 2019, the Company issued $132.0 million aggregate principal amount of 1.0% convertible senior notes due 2024 (the “Notes due 2024”). The Notes due 2024 are general unsecured obligations and bear interest at an annual rate of 1.0% per year, payable semi-annually on June 1 and December 1 of each year, beginning December 1, 2019. The Notes due 2024 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The Notes due 2024 will mature on June 1, 2024, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the notes prior to the maturity date, and no sinking fund is provided for the notes. The Notes due 2024 may be converted, under certain circumstances as described below, based on an initial conversion rate of 48.7781 shares of common stock per $1,000 principal amount (which represents an initial conversion price of $20.5010 per share). The conversion rate for the Notes due 2024 will be subject to adjustment upon the occurrence of certain specified events but will not be adjusted for accrued and unpaid interest. In addition, upon the occurrence of a make-whole fundamental change (as defined in the relevant indenture), the Company will, in certain circumstances, increase the conversion rate by a number of additional shares for a holder that elects to convert its notes in connection with such make-whole fundamental change. The Company received approximately $128.0 million in net proceeds, after deducting the initial purchasers’ discount, from the issuance of the Notes due 2024.

The Notes due 2024 may be converted on any day prior to the close of business on the business day immediately preceding December 1, 2023, in multiples of $1,000 principal amount, at the option of the holder only under any of the following circumstances: (1) during any calendar quarter commencing after the calendar quarter ending on September 30, 2019 (and only during such calendar quarter), if the last reported sale price of the Company’s common stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter is greater than or equal to $26.6513 (130% of the conversion price) on each applicable trading day; (2) during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the relevant indenture) per $1,000 principal amount of notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s common stock and the conversion rate on each such trading day; or (3) upon the occurrence of specified corporate events. On and after December 1, 2023 until the close of business on the second scheduled trading day immediately preceding the maturity date of June 1, 2024, holders may convert their notes at any time, regardless of the foregoing circumstances. Upon the occurrence of a fundamental change (as defined in the relevant indenture), holders may require the Company to repurchase all or a portion of their Notes due 2024 for cash at a price equal to 100% of the principal amount of the notes to be repurchased plus any accrued and unpaid interest to, but excluding, the fundamental change repurchase date.

As of March 31, 2020, the sale price of the Company’s common stock was greater than or equal to $26.6513 (130% of the notes conversion price) for at least 20 trading days (whether consecutive or not) during a period of 30 consecutive trading days preceding the quarter-ended March 31, 2020. As a result, as of March 31, 2020, the Notes due 2024 became convertible at the holders’ option beginning on April 1, 2020 and ending June 30, 2020. Accordingly, the Company classified the net carrying amount of the Notes due 2024 of $97.9 million as Debt, current on the condensed consolidated balance sheet as of March 31, 2020.

In accounting for the issuance of the Notes due 2024, on June 5, 2019, the Company separated the Notes due 2024 into liability and equity components. The carrying amount of the liability component of approximately $95.6 million was calculated by using a discount rate of 7.75%, which was the Company’s borrowing rate on the date of the issuance of the notes for a similar debt instrument without the conversion feature. The carrying amount of the equity component of approximately $36.4 million, representing the conversion option, was determined by deducting the fair value of the liability component from the par value of the Notes due 2024. The equity component of the Notes due 2024 is included in additional paid-in capital in the condensed consolidated balance sheet and is not remeasured as long as it continues to meet the conditions for equity classification. The difference between the principal amount of the Notes due 2024 and the liability component (the “debt discount”) is amortized to interest expense using the effective interest method over the term of the Notes due 2024.

The Company separated the Notes due 2024 into liability and equity components, this resulted in a tax basis difference associated with the liability component that represents a temporary difference. The Company recognized the deferred taxes of $0.3 million for the tax effect of that temporary difference as an adjustment to the equity component included in additional paid-in capital in the condensed consolidated balance sheet.

Debt issuance costs for the issuance of the Notes due 2024 were approximately $4.6 million, consisting of initial purchasers' discount and other issuance costs. In accounting for the transaction costs, the Company allocated the total amount incurred to the liability and equity components using the same proportions as the proceeds from the Notes due 2024. Transaction costs attributable to the liability component were approximately $3.3 million, were recorded as debt issuance cost (presented as contra debt in the condensed consolidated balance sheet) and are being amortized to interest expense over the term of the Notes due 2024. The transaction costs attributable to the equity component were approximately $1.3 million and were netted with the equity component in stockholders’ equity. As of March 31, 2020 and December 31, 2019, the unamortized deferred issuance cost for the Notes due 2024 was $2.8 million and $2.9 million, respectively, on the condensed consolidated balance sheets.

The following table presents the total amount of interest cost recognized relating to the Notes due 2024:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	330
Amortization of debt discount	1,562
Amortization of debt issuance costs	166
Total interest cost recognized	$	2,058

The effective interest rate on the liability component Notes due 2024 was 7.75% for the three months ended March 31, 2020, which remains unchanged from the date of issuance. The remaining unamortized debt discount was $31.3 million and $32.9 million as of March 31, 2020 and December 31, 2019, respectively, will be amortized over approximately 4.2 years from March 31, 2020.

Notes due 2024 Hedge and Warrant Transactions

In connection with the offering of the Notes due 2024, the Company entered into privately-negotiated convertible note hedge transactions pursuant to which the Company has the option to purchase a total of approximately 6.4 million shares of its common stock (subject to anti-dilution adjustments), which is the same number of shares initially issuable upon conversion of the notes, at a price of $20.5010 per share, which is the initial conversion price of the Notes due 2024. The total cost of the convertible note hedge transactions was approximately $36.3 million. The convertible note hedge transactions are expected generally to reduce potential dilution to the Company’s common stock upon any conversion of the Notes due 2024 and/or offset any cash payments the Company is required to make in excess of the principal amount of converted notes, as the case may be. As of March 31, 2020, and through the date of this quarterly report, the Company had not purchased any shares under the convertible note hedge transactions.

Additionally, the Company separately entered into privately-negotiated warrant transactions (the “Warrants”) whereby the Company sold warrants to acquire approximately 6.4 million shares of the Company’s common stock (subject to anti-dilution adjustments) at an initial strike price of $25.2320 per share. The Company received aggregate proceeds of approximately $29.8 million from the sale of the Warrants. If the market value per share of the Company’s common stock, as measured under the Warrants, exceeds the strike price of the Warrants, the Warrants will have a dilutive effect on the Company’s earnings per share, unless the Company elects, subject to certain conditions, to settle the Warrants in cash. Taken together, the purchase of the convertible note hedges and the sale of the Warrants are intended to reduce potential dilution from the conversion of the Notes due 2024 and to effectively increase the overall conversion price from $20.5010 to $25.2320 per share. The Warrants are only exercisable on the applicable expiration dates in accordance with the Warrants. Subject to the other terms of the Warrants, the first expiration date applicable to the Warrants is September 1, 2024, and the final expiration date applicable to the Warrants is April 22, 2025. As of March 31, 2020, and through the report date, the Warrants had not been exercised and remained outstanding.

Given that the transactions meet certain accounting criteria, the Notes due 2024 hedge and the warrants transactions are recorded in stockholders’ equity, and they are not accounted for as derivatives and are not remeasured each reporting period.

Convertible Senior Notes due 2023

In August 2018, the Company sold $65.0 million aggregate principal amount of 4.0% convertible senior notes due 2023 (the “Notes due 2023”) in a private placement. On May 30, 2019, the Company entered into separately and privately negotiated transactions with certain holders of the Notes due 2023 resulting in the repurchase and exchange, as of June 5, 2019, of $60.0 million aggregate principal amount of the notes in consideration for the issuance of 10,801,080 shares of common stock and separate cash payments totaling $6.0 million. As of both March 31, 2020 and December 31, 2019, $5.0 million aggregate principal amount of the Notes due 2023 remain outstanding.

The remaining outstanding Notes due 2023 are general unsecured obligations and bear interest at a rate of 4.0% per year, payable semi-annually on February 1 and August 1 of each year. The Notes due 2023 are governed by an indenture between the Company and U.S. Bank National Association, as trustee. The remaining outstanding Notes due 2023 will mature on August 1, 2023, unless earlier repurchased by the Company or converted at the option of the holders. The Company may not redeem the remaining Notes due 2023 prior to the maturity date, and no sinking fund is provided for such notes. The remaining Notes due 2023 are convertible, at a holder’s election, in multiples of $1,000 principal amount, into shares of the Company’s common stock based on the applicable conversion rate. The initial conversion rate for such notes is 180.0180 shares of common stock per $1,000 principal amount of notes (which is equivalent to an initial conversion price of approximately $5.56 per share). The conversion rate and the corresponding conversion price are subject to adjustment upon the occurrence of certain events but will not be adjusted for any accrued and unpaid interest. Holders of the remaining Notes due 2023 who convert their notes in connection with a make-whole fundamental change (as defined in the applicable indenture) are, under certain circumstances, entitled to an increase in the conversion rate. Additionally, in the event of a fundamental change, holders of the remaining Notes due 2023 may require the Company to repurchase all or a portion of their notes at a price equal to 100% of the principal amount of notes, plus any accrued and unpaid interest, including any additional interest to, but excluding, the repurchase date. Holders may convert all or any portion of their Notes due 2023 at their option at any time prior to the close of business on the business day immediately preceding the maturity date, in multiples of $1,000 principal amount.

The following table presents the amount of interest cost recognized relating to the contractual interest coupon and the amortization of debt issuance costs of the Notes due 2023.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Contractual interest expense	$	50	$	650
Amortization of debt issuance costs	10		129
Total interest costs recognized	$	60	$	779

Sale of Long-Term Financing Receivables

The Company entered into an agreement with a third party in the fourth quarter of 2017 to sell certain current and future receivables at a discount. In December 2017, the third party made an initial purchase of receivables that resulted in net proceeds to the Company of $2.8 million. This transaction was recorded as debt on the accompanying consolidated balance sheets, and the debt balance was relieved in January 2019 as the underlying receivables were settled. During the year ended December 31, 2018, the third party made three additional purchases of receivables that resulted in total net proceeds to the Company of $5.6 million. These transactions were recorded as debt on the accompanying condensed consolidated balance sheets, and the total associated debt balance will be relieved by September 2021 as the underlying receivables are settled.

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GOODWILL AND INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

The Company’s goodwill and purchased intangible assets as of March 31, 2020 and December 31, 2019 are as follows:

	March 31, 2020							December 31, 2019
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	24,783	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—		$	286
Intangible assets with finite lives:
Developed technology	13,100		(3,639		)	9,461		13,100		(3,093		)	10,007
Customer relationships	23,100		(3,515		)	19,585		23,100		(2,814		)	20,286
Total purchased intangible assets	$	36,486	$	(7,154	)	$	29,332	$	36,486	$	(5,907	)	$	30,579

Amortization expense related to finite-lived intangible assets are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	546
Customer relationships	701		636
Total amortization expense	$	1,247	$	1,182

Amortization of developed technology, patents and licensed technology is recorded to sales and marketing expense. The developed technology acquired from the Company’s acquisition of SunPower Corporation’s (“SunPower”) microinverter business in August 2018 was embedded in the microinverters that SunPower sold to its customers. The Company does not actively use the developed technology acquired from SunPower and holds the developed technology to prevent others from using it. Accordingly, the Company accounts for the developed technology as a defensive intangible asset and amortizes the associated value over a period of six years from the date of acquisition.

The master supply agreement (“MSA”) entered into with SunPower in August 2018 provides the Company with the exclusive right to supply SunPower with module level power electronics for a period of five years, with options for renewals. The exclusivity arrangement extends throughout the term of the MSA, which comprises all of the expected cash flows from the customer relationship intangible asset, and was a condition to, and was an essential part of the acquisition of SunPower’s microinverter business by the Company. As the fair value ascribed to the customer relationship intangible asset represents payments to a customer, the Company amortizes the value of the customer relationship intangible asset as a reduction to revenue using a pattern of economic benefit method over a useful life of nine years.

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REVENUE RECOGNITION - Summary of Disaggregated Revenue by Primary Geographical Market and Timing of Revenue Recognition (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 205,545	$ 100,150
Products delivered at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	194,679	90,400
Products and services delivered over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	10,866	9,750
United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	179,600	77,686
International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 25,945	$ 22,464

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REVENUE RECOGNITION - Summary of Estimated Revenue Expected to be Recognized in Future Periods (Details) $ in Thousands	Mar. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 145,227
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2020-04-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 30,514
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing	9 months
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 33,553
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 28,527
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 22,743
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2024-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 17,566
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing	1 year
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2025-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 12,324
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Total estimated revenue expected to be recognized in future periods, expected timing

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DEBT - Schedule of Convertible Senior Notes due 2023 (Details) - Convertible Notes - Convertible Senior Notes Due 2023 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Contractual interest expense	$ 50	$ 650
Amortization of debt issuance costs	10	129
Total interest cost recognized	$ 60	$ 779

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DEBT - Convertible Notes Hedge and Warrant Liability (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2020	Mar. 31, 2019
Debt Instrument [Line Items]
Convertible notes hedge, beginning balance		$ 0
Convertible notes hedge, change in the fair value		15,344	$ 0
Convertible notes hedge, ending balance	$ 47,885	47,885
Warrants liability, beginning balance		0
Warrants liability, ending balance	38,637	38,637
Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Convertible notes hedge, beginning balance	89,056
Convertible notes hedge, change in the fair value	(41,171)
Convertible notes hedge, ending balance	47,885	47,885
Warrants liability, beginning balance	71,552
Warrants liability, change in fair value	(32,915)
Warrants liability, ending balance	$ 38,637	$ 38,637

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STOCK-BASED COMPENSATION - Summary of Performance Stock Unit Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) $ / shares shares
Aggregate Intrinsic Value
Share price (in usd per share)	$ 32.29
Performance shares
Number of Shares Outstanding
Outstanding, beginning balance (in shares) | shares	955
Granted (in shares) | shares	482
Vested (in shares) | shares	(1,410)
Canceled (in shares) | shares	0
Outstanding, ending balance (in shares) | shares	27
Weighted Average Fair Value per Share at Grant Date
Outstanding, beginning balance (in usd per share)	$ 9.83
Granted (in usd per share)	11.52
Vested (in usd per share)	10.41
Canceled (in usd per share)	0
Outstanding, ending balance (in usd per share)	$ 4.40
Weighted-Average Remaining Contractual Term
Weighted- Average Remaining Contractual Term	0 years
Aggregate Intrinsic Value
Vested | $	$ 50,938
Outstanding | $	$ 872

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NET INCOME PER SHARE - Narrative (Details)	Jun. 05, 2019 $ / shares
Convertible Senior Notes Due 2024 | Convertible Notes
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Debt conversion price (in USD per share)	$ 20.5010

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STOCK-BASED COMPENSATION - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Number of Shares Outstanding
Outstanding, beginning balance (in shares)	4,097,000
Granted (in shares)	0	0
Exercised (in shares)	(541,000)
Canceled (in shares)	(73,000)
Outstanding, ending balance (in shares)	3,483,000
Shares outstanding, vested and expected to vest (in shares)	3,483,000
Shares outstanding, exercisable (in shares)	2,518,000
Weighted- Average Exercise Price per Share
Outstanding, beginning balance (in usd per share)	$ 2.18
Granted (in usd per share)	0
Exercised (in usd per share)	2.58
Canceled (in usd per share)	7.44
Outstanding, ending balance (in usd per share)	2.01
Weighted-average exercise price, vested and expected (in usd per share)	2.01
Weighted-average exercise price, exercisable (in usd per share)	$ 2.22
Weighted-Average Remaining Contractual Term
Outstanding	4 years 2 months 12 days
Vested and expected to vest	4 years 2 months 12 days
Exercisable	4 years 1 month 6 days
Aggregate Intrinsic Value
Exercised	$ 28,263
Outstanding	105,469
Vested and expected to vest	105,469
Exercisable	$ 75,706
Share price (in usd per share)	$ 32.29

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COMMITMENTS AND CONTINGENT LIABILITIES - Schedule of Minimum Lease Payments Under Noncancelable Operating Leases (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2020 (remaining nine months)	$ 3,432
2021	4,651
2022	3,337
2023	2,619
2024	1,415
2025 and thereafter	1,902
Total lease payments	17,356
Less: imputed lease interest	(2,873)
Total lease liabilities	$ 14,483	$ 12,712

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RESTRUCTURING - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 0	$ 368
Redundancy and employee severance and benefit arrangements
Restructuring Cost and Reserve [Line Items]
Restructuring charges	0	468
Lease loss reserves
Restructuring Cost and Reserve [Line Items]
Restructuring reserve, accrual adjustment	$ 0	$ (100)

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OTHER FINANCIAL INFORMATION - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Salaries, commissions, incentive compensation and benefits	$ 9,200	$ 5,524
Customer rebates and sales incentives	21,601	24,198
Freight	3,734	4,908
Operating lease liabilities, current	3,511	3,170
Other	11,771	9,292
Total accrued liabilities	$ 49,817	$ 47,092

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FAIR VALUE MEASUREMENTS - Schedule of Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Dec. 31, 2018
Liabilities:
Convertible notes embedded derivative	$ 45,100
Warrants liability	38,637	$ 0
Warranty obligations, current	9,678	10,078	$ 7,925
Warranty obligations, non-current	27,823	27,020	23,117
Total warranty obligations measured at fair value	37,501	37,098	$ 31,042	$ 31,294
Recurring | Level 2
Assets:
Convertible notes hedge	47,885	0
Liabilities:
Warrants liability	38,637	0
Warranty obligations, current	0	0
Warranty obligations, non-current	0	0
Total warranty obligations measured at fair value	0	0
Total liabilities measured at fair value	83,737	0
Recurring | Level 2 | Convertible Notes
Liabilities:
Convertible notes embedded derivative	45,100	0
Recurring | Level 3
Assets:
Convertible notes hedge	0	0
Liabilities:
Warrants liability	0	0
Warranty obligations, current	6,578	6,794
Warranty obligations, non-current	13,847	13,012
Total warranty obligations measured at fair value	20,425	19,806
Total liabilities measured at fair value	20,425	19,806
Recurring | Level 3 | Convertible Notes
Liabilities:
Convertible notes embedded derivative	$ 0	$ 0

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WARRANTY OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2020

Product Warranties Disclosures [Abstract]

Summary of Warranty Activities

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Warranty obligations, beginning of period	$	37,098		$	31,294
Accruals for warranties issued during period	1,524			858
Changes in estimates	1,677			804
Settlements	(3,270		)	(2,296		)
Increase due to accretion expense	774			551
Other	(302		)	(169		)
Warranty obligations, end of period	37,501			31,042
Less: current portion	(9,678		)	(7,925		)
Noncurrent	$	27,823		$	23,117

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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION Policy (Policies)

3 Months Ended

Mar. 31, 2020

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Consolidation

Basis of Presentation and Consolidation

The accompanying condensed consolidated financial statements are presented in accordance with accounting principles generally accepted in the United States (“U.S.”), or GAAP. The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries. All intercompany balances and transactions have been eliminated in consolidation.

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, disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of income and expenses during the reporting period. Significant estimates and assumptions reflected in the financial statements include revenue recognition, allowance for doubtful accounts, stock-based compensation, inventory valuation, accrued warranty obligations, fair value of debt derivatives, fair value of acquired intangible assets and goodwill, useful lives of acquired intangible assets and property and equipment, incremental borrowing rate for right-of-use assets and lease liability, legal contingencies, and tax valuation allowance. These estimates are based on information available as of the date of the financial statements; therefore, actual results could differ materially from management’s estimates using different assumptions or under different conditions.

The worldwide spread of the COVID-19 pandemic is expected to result in a global slowdown of economic activity which is likely to decrease demand for a broad variety of goods and services, including from the Company’s customers, while also disrupting sales channels and marketing activities for an unknown period of time until the disease is contained. The Company expects this to have a negative impact on its sales and its results of operations. In preparing the Company’s condensed consolidated financial statements in accordance with GAAP, the Company is required to make estimates, assumptions and judgments that affect the amounts reported in its financial statements and the accompanying disclosures. Estimates and assumptions about future events and their effects cannot be determined with certainty and therefore require the exercise of judgment. As of the date of issuance of these financial statements, the Company is not aware of any specific event or circumstance that would require the Company to update its estimates, judgments or revise the carrying value of its assets or liabilities. These estimates may change, as new events occur and additional information is obtained, and are recognized in the condensed consolidated financial statements as soon as they become known. Actual results could differ from those estimates and any such differences may be material to the Company’s financial statements.

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In August 2018, the FASB issued ASU 2018-15, “Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract,” to reduce diversity in practice in accounting for the costs of implementing cloud computing arrangements that are service contracts. ASU 2018-15 allows entities to apply the guidance in the ASC 350-40, “Intangibles–Goodwill and Other–Internal-Use Software,” to determine which implementation costs are eligible to be capitalized as assets in a cloud computing arrangement that is considered a service contract. ASU 2018-15 is effective for fiscal years beginning after December 15, 2019, and interim periods within those fiscal years. Early adoption is permitted, including adoption in any interim period. Entities have the option to apply the guidance prospectively to all implementation costs incurred after the date of adoption or retrospectively and are required to make certain disclosures in the interim and annual period of adoption. The Company adopted the new standard effective January 1, 2020 on a prospective basis and the adoption of this guidance did not have a material impact on its consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, “Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments,” which requires the measurement and recognition of expected credit losses for financial assets held at amortized cost. ASU 2016-13 replaces the existing incurred loss impairment model with a current expected credit loss (CECL) model which will result in earlier recognition of credit losses. On January 1, 2020, the Company adopted Topic 326, the measurement of expected credit losses under the CECL model is applicable to financial assets measured at amortized cost, including accounts receivable. The adoption of this guidance did not have a material impact on the Company’s consolidated financial statements.

Fair Value Measurement

The accounting guidance defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance.

The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company is able to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of such assets or liabilities do not entail a significant degree of judgment.

• Level 2—Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

•

Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

Earnings Per Share

Basic net income per share is computed by dividing net income by the weighted average number of shares of common stock outstanding during the period. Diluted net income per share is computed in a similar manner, but it also includes the effect of potential common shares outstanding during the period, when dilutive. Potential common shares include Stock Options, RSUs, PSUs, shares to be purchased under the Company’s ESPP, the Notes due 2023, the Notes due 2024 and warrants issued in conjunction with the Notes due 2024. Until the Company’s authorized shares of common stock increases to satisfy the share reservation condition, the Notes due 2025 and warrants issued in conjunction with the Notes due 2025 must be settled in cash, and therefore excluded from shares used in diluted per share amounts.

The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method for stock options, RSUs, PSUs, Notes due 2024, warrants issued in conjunction with the Notes due 2024 and shares to be purchased under the ESPP, and by application of the if-converted method for the Notes due 2023. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income per share.

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COMMITMENTS AND CONTINGENT LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

Components of Lease

The components of lease expense are presented as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Operating lease costs	$	1,222	$	499

The components of lease liabilities are presented as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Operating lease liabilities, current (Accrued liabilities)	$	3,511	$	3,170
Operating lease liabilities, noncurrent (Other liabilities)	10,972		9,542
Total operating lease liabilities	$	14,483	$	12,712
Supplemental lease information:
Weighted average remaining lease term	5.6 years		5.5 years
Weighted average discount rate	8.3%		8.6%

Supplemental cash flow and other information related to operating leases, are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,014	$	737
Non-cash investing activities:
Lease liabilities arising from obtaining right-of-use assets	$	2,941	$	—

Schedule of Future Minimum Rental Payments for Operating Leases

Undiscounted cash flows of operating lease liabilities as of March 31, 2020 are as follows:

	Lease Amounts
	(In thousands)
Year:
2020 (remaining nine months)	$	3,432
2021	4,651
2022	3,337
2023	2,619
2024	1,415
2025 and thereafter	1,902
Total lease payments	17,356
Less: imputed lease interest	(2,873		)
Total lease liabilities	$	14,483

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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY - USD ($) $ in Thousands		Total	Common Stock and Additional Paid-In Capital	Accumulated deficit	Accumulated Other Comprehensive Income (Loss)
Balance, beginning of period at Dec. 31, 2018			$ 353,336	$ (346,302)	$ 742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to additional paid in capital and other	[1]		26	(26)
Issuance of common stock from exercise of equity awards			1,664
Payment of withholding taxes related to net share settlement of equity awards			(1,355)
Stock-based compensation expense and other			3,353
Net income		$ 2,765		2,765
Foreign currency translation adjustments		(79)			(79)
Balance, end of period at Mar. 31, 2019		14,124	357,024	(343,563)	663
Balance, beginning of period at Dec. 31, 2019		272,212	458,316	(185,181)	(923)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Cumulative-effect adjustment to additional paid in capital and other	[1]		0	0
Issuance of common stock from exercise of equity awards			1,979
Payment of withholding taxes related to net share settlement of equity awards			(34,267)
Stock-based compensation expense and other			7,515
Net income		68,936		68,936
Foreign currency translation adjustments		(168)			(168)
Balance, end of period at Mar. 31, 2020		$ 316,207	$ 433,543	$ (116,245)	$ (1,091)

[1] ncludes the adoption of Accounting Standards Update (“ASU”) 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting” on January 1, 2019

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands		Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents		$ 549,144	$ 251,409
Restricted cash		44,700	44,700
Accounts receivable, net of allowances of $374 and $564 at March 31, 2020 and December 31, 2019, respectively		95,484	145,413
Inventory		34,617	32,056
Prepaid expenses and other assets		27,752	26,079
Total current assets		751,697	499,657
Property and equipment, net		30,500	28,936
Operating lease, right of use asset		11,986	10,117
Intangible assets, net		29,332	30,579
Goodwill		24,783	24,783
Other assets		47,798	44,620
Deferred tax assets, net		86,806	74,531
Convertible notes hedge		47,885	0
Total assets		1,030,787	713,223
Current liabilities:
Accounts payable		34,538	57,474
Accrued liabilities		49,817	47,092
Deferred revenues, current		39,022	81,783
Warranty obligations, current (includes $6,578 and $6,794 measured at fair value at March 31, 2020 and December 31, 2019, respectively)		9,678	10,078
Debt, current		100,567	2,884
Total current liabilities		233,622	199,311
Long-term liabilities:
Deferred revenues, noncurrent		106,205	100,204
Warranty obligations, noncurrent (includes $13,847 and $13,012 measured at fair value at March 31, 2020 and December 31, 2019, respectively)		27,823	27,020
Other liabilities		13,077	11,817
Debt, noncurrent	[1]	295,216	102,659
Warrants liability		38,637	0
Total liabilities		714,580	441,011
Commitments and contingent liabilities (Note 9)
Stockholders’ equity:
Common stock, $0.00001 par value, 150,000 shares and 150,000 shares authorized; and 125,072 shares and 123,109 shares issued and outstanding at March 31, 2020 and December 31, 2019, respectively		1	1
Additional paid-in capital		433,542	458,315
Accumulated deficit		(116,245)	(185,181)
Accumulated other comprehensive loss		(1,091)	(923)
Total stockholders’ equity		316,207	272,212
Total liabilities and stockholders’ equity		1,030,787	$ 713,223
Convertible notes embedded derivative		$ 45,100

[1] Debt, noncurrent balance as of March 31, 2020, includes Convertible Notes due 2025 embedded derivative balance of $45.1 million. See Note 8, “Debt,” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q for further details.

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OTHER FINANCIAL INFORMATION - Accounts Receivable, Allowance for Doubtful Accounts (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Balance, at beginning of year	$ 564	$ 2,138	$ 2,138
Provision for doubtful accounts	104	$ 0	217
Write-offs, net of recoveries	(294)		(1,791)
Balance, at end of year	$ 374		$ 564

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

Summary of the Components of Total Stock-Based Compensation Expense

The following table summarizes the components of total stock-based compensation expense included in the condensed consolidated statements of operations for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cost of revenues	$	606	$	231
Research and development	1,919		716
Sales and marketing	1,942		999
General and administrative	3,048		1,288
Restructuring	—		55
Total	$	7,515	$	3,289

Summary of Stock-Based Compensation Associated with Each Type of Award

The following table summarizes the various types of stock-based compensation expense for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Stock options, RSUs, and PSUs	$	7,077	$	3,222
Employee stock purchase plan	438		67
Total	$	7,515	$	3,289

Summary of Stock Option Activity

The following is a summary of stock option activity.

	Number of Shares Outstanding		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,097		$	2.18
Granted	—		—
Exercised	(541	)	2.58			$	28,263
Canceled	(73	)	7.44
Outstanding at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Vested and expected to vest at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Exercisable at March 31, 2020	2,518		$	2.22	4.1	$	75,706

(1)

The intrinsic value of options exercised is based upon the value of the Company’s stock at exercise. The intrinsic value of options outstanding, vested and expected to vest, and exercisable as of March 31, 2020 is based on the closing price of the Company’s stock fair value on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

Summary of Stock Option Outstanding

The following table summarizes information about stock options outstanding at March 31, 2020.

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number of Shares	Weighted- Average Remaining Life	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
	(In thousands)	(Years)			(In thousands)
$0.70 —– $1.11	751	4.8	$	0.82	565	$	0.80
$1.29 —– $1.29	1,000	4.5	1.29		625	1.29
$1.31 —– $1.31	1,037	4.0	1.31		765	1.31
$1.37 —– $12.57	653	3.3	4.78		527	5.34
$14.58 —– $14.58	42	6.1	14.58		36	14.58
Total	3,483	4.2	$	2.01	2,518	$	2.22

Summary of Restricted Stock Unit Activity

The following is a summary of RSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,263		$	7.19
Granted	552		31.34
Vested	(951	)	6.13			$	34,095
Canceled	(34	)	16.92
Outstanding at March 31, 2020	3,830		$	10.85	1.3	$	123,672
Expected to vest at March 31, 2020	3,830		$	10.63	1.3	$	114,306

(1)

The intrinsic value of RSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of RSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

Share-based Compensation, Performance Shares Award Outstanding Activity

The following is a summary of PSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	955		$	9.83
Granted	482		11.52
Vested	(1,410	)	10.41			$	50,938
Canceled	—		—
Outstanding at March 31, 2020	27		$	4.40	0	$	872

(1)

The intrinsic value of PSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of PSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

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REVENUE RECOGNITION - Narrative (Details)	3 Months Ended
	Mar. 31, 2020 USD ($)
Revenue from Contract with Customer [Abstract]
Contract asset impairment charges	$ 0

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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2020

Share-based Payment Arrangement [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATION

Stock-based Compensation Expense

Stock-based compensation expense for all stock-based awards expected to vest is measured at fair value on the date of grant and recognized ratably over the requisite service period. The following table summarizes the components of total stock-based compensation expense included in the condensed consolidated statements of operations for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cost of revenues	$	606	$	231
Research and development	1,919		716
Sales and marketing	1,942		999
General and administrative	3,048		1,288
Restructuring	—		55
Total	$	7,515	$	3,289

The following table summarizes the various types of stock-based compensation expense for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Stock options, RSUs, and PSUs	$	7,077	$	3,222
Employee stock purchase plan	438		67
Total	$	7,515	$	3,289

As of March 31, 2020, there was approximately $40.6 million of total unrecognized stock-based compensation expense related to unvested equity awards, which are expected to be recognized over a weighted-average period of 2.8 years.

Valuation of Equity Awards

Stock Options

The fair value of each option granted was estimated on the date of grant using the Black-Scholes option-pricing model. No options were granted during the three months ended March 31, 2020 and 2019.

Restricted Stock Units

The fair value of the Company’s restricted stock units (“RSU”) awards granted is based upon the closing price of the Company’s stock price on the date of grant.

Performance Stock Units

The fair value of the Company’s non-market performance stock units (“PSU”) awards granted was based upon the closing price of the Company’s stock price on the date of grant. The fair value of awards of the Company’s PSU awards containing market conditions was determined using a Monte Carlo simulation model based upon the terms of the conditions, the expected volatility of the underlying security, and other relevant factors.

Equity Awards Activity

Stock Options

The following is a summary of stock option activity.

	Number of Shares Outstanding		Weighted- Average Exercise Price per Share		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,097		$	2.18
Granted	—		—
Exercised	(541	)	2.58			$	28,263
Canceled	(73	)	7.44
Outstanding at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Vested and expected to vest at March 31, 2020	3,483		$	2.01	4.2	$	105,469
Exercisable at March 31, 2020	2,518		$	2.22	4.1	$	75,706

(1)

The intrinsic value of options exercised is based upon the value of the Company’s stock at exercise. The intrinsic value of options outstanding, vested and expected to vest, and exercisable as of March 31, 2020 is based on the closing price of the Company’s stock fair value on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

The following table summarizes information about stock options outstanding at March 31, 2020.

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number of Shares	Weighted- Average Remaining Life	Weighted- Average Exercise Price		Number of Shares	Weighted- Average Exercise Price
	(In thousands)	(Years)			(In thousands)
$0.70 —– $1.11	751	4.8	$	0.82	565	$	0.80
$1.29 —– $1.29	1,000	4.5	1.29		625	1.29
$1.31 —– $1.31	1,037	4.0	1.31		765	1.31
$1.37 —– $12.57	653	3.3	4.78		527	5.34
$14.58 —– $14.58	42	6.1	14.58		36	14.58
Total	3,483	4.2	$	2.01	2,518	$	2.22

Restricted Stock Units

The following is a summary of RSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	4,263		$	7.19
Granted	552		31.34
Vested	(951	)	6.13			$	34,095
Canceled	(34	)	16.92
Outstanding at March 31, 2020	3,830		$	10.85	1.3	$	123,672
Expected to vest at March 31, 2020	3,830		$	10.63	1.3	$	114,306

(1)

The intrinsic value of RSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of RSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

Performance Stock Units

The following is a summary of PSU activity.

	Number of Shares Outstanding		Weighted- Average Fair Value per Share at Grant Date		Weighted- Average Remaining Contractual Term	Aggregate Intrinsic Value (1)
	(In thousands)				(Years)	(In thousands)
Outstanding at December 31, 2019	955		$	9.83
Granted	482		11.52
Vested	(1,410	)	10.41			$	50,938
Canceled	—		—
Outstanding at March 31, 2020	27		$	4.40	0	$	872

(1)

The intrinsic value of PSUs vested is based upon the value of the Company’s stock when vested. The intrinsic value of PSUs outstanding and expected to vest as of March 31, 2020 is based on the closing price of the Company’s stock on March 31, 2020 or the earlier of the last trading day prior to March 31, 2020, if March 31, 2020 is a non-trading day. The Company’s stock fair value used in this computation was $32.29 per share.

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2020

Fair Value Disclosures [Abstract]

Fair Value Measurements

FAIR VALUE MEASUREMENTS

The accounting guidance defines fair value as the price that would be received from selling an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. When determining the fair value measurements for assets and liabilities recorded at fair value, the Company considers the principal or most advantageous market in which it would transact and considers assumptions that market participants would use when pricing the asset or liability, such as inherent risk, transfer restrictions, and risk of nonperformance.

The fair value hierarchy requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value. An asset’s or liability’s categorization within the fair value hierarchy is based upon the lowest level of input that is significant to the fair value measurement. Three levels of inputs may be used to measure fair value:

• Level 1—Valuations based on quoted prices in active markets for identical assets or liabilities that the Company is able to access. Since valuations are based on quoted prices that are readily and regularly available in an active market, valuation of such assets or liabilities do not entail a significant degree of judgment.

• Level 2—Valuations based on one or more quoted prices in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

• Level 3—Valuations based on inputs that are unobservable and significant to the overall fair value measurement.

The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy.

	March 31, 2020				December 31, 2019
	(In thousands)
	Level 2		Level 3		Level 2		Level 3
Assets:
Convertible notes hedge	$	47,885	$	—	$	—	$	—
Liabilities:
Debt, non-current
Convertible notes embedded derivative	45,100		—		—		—
Warrants liability	38,637		—		—		—
Warranty obligations
Current	—		6,578		—		6,794
Non-current	—		13,847		—		13,012
Total warranty obligations measured at fair value	—		20,425		—		19,806
Total liabilities measured at fair value	$	83,737	$	20,425	$	—	$	19,806

Level 1. The Company's cash and cash equivalents primarily include highly liquid money market fund instruments and are within Level 1 of the fair value hierarchy because they are valued using quoted market prices for identical instruments in active markets. As of March 31, 2020, cash and cash equivalents balance includes money market funds of $542.2 million.

Level 2.

Convertible Notes due 2025 Derivatives

On March 9, 2020, the Company issued $320 million aggregate principal amount of 0.25% convertible senior notes due 2025 (the “Notes due 2025”) as further described in Note. 8 “Debt”. Concurrently with the issuance of the Notes due 2025, the Company entered into privately-negotiated convertible note hedge and warrant transactions which in combination are intended to reduce the potential dilution from the conversion of the Notes due 2025 and to effectively increase the overall conversion price from $81.54 to $106.94 per share. Initially, conversion of the Notes due 2025 will be settled solely in cash; however, following satisfaction of certain share reservation conditions (as defined in the relevant Indenture), conversion of the Notes due 2025 may be settled in cash, shares of the Company’s common stock or a combination of cash and shares of its common stock, at the Company’s election. The conversion option associated with the Notes due 2025 currently meets the criteria for an embedded derivative liability which required bifurcation and separate accounting. In addition, the privately-negotiated convertible note hedge and warrant transactions are also currently classified as a derivative asset and liability, respectively, on the Company’s condensed consolidated balance sheet. On the date the Company increases its authorized shares of common stock and satisfies the share reservation condition, the derivative asset and liabilities will be reclassified to additional paid-in capital as the equity classification criteria is met. Changes in the fair value of these derivatives prior to being classified in equity are reflected in other income (expense), net, in the Company’s condensed consolidated statement of operations.

The fair value of the Convertible notes embedded derivative is estimated using Binomial Lattice model and the fair value of Convertible notes hedge and Warrants liability is estimated using Black-Scholes-Merton model. Based on the fair value hierarchy, the Company classified the Convertible notes embedded derivative, Convertible notes hedge and Warrants liability derivatives (collectively the “derivatives”) to be Level 2 as significant inputs are observable, either directly or indirectly. The significant inputs and assumptions used in the models to calculate the fair value of the derivatives include the Company’s common stock price, exercise price of the derivatives, risk-free interest rate, volatility, annual coupon rate and remaining contractual term.

Notes due 2025 and Notes due 2024. The Company carries the Notes due 2025 and Notes due 2024 (as defined below) at face value less unamortized discount and issuance costs on its condensed consolidated balance sheets. The fair value of the Notes due 2025 and Notes due 2024 of $262.3 million and $252.9 million, respectively, was determined based on the closing trading prices per $100 principal amount as of the last day of trading for the period. The Company considers the fair value of the Notes due 2025 and Notes due 2024 to be a Level 2 measurement as they are not actively traded.

Level 3.

Warranty Obligations.

Fair Value Option for Warranty Obligations Related to Microinverters Sold Since January 1, 2014

The Company estimates the fair value of warranty obligations by calculating the warranty obligations in the same manner as for sales prior to January 1, 2014 and applying an expected present value technique to that result. The expected present value technique, an income approach, converts future amounts into a single current discounted amount. In addition to the key estimates of failure rates, claim rates and replacement costs, the Company used certain Level 3 inputs which are unobservable and significant to the overall fair value measurement. Such additional assumptions included a discount rate based on the Company’s credit-adjusted risk-free rate and compensation comprised of a profit element and risk premium required of a market participant to assume the obligation.

The following table provides information regarding changes in nonfinancial liabilities related to the Company’s warranty obligations measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods indicated.

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Balance at beginning of period	$	19,806		$	11,757
Accruals for warranties issued during period	1,524			858
Changes in estimates	615			341
Settlements	(1,993		)	(1,272		)
Increase due to accretion expense	774			551
Other	(301		)	(170		)
Balance at end of period	$	20,425		$	12,065

Quantitative and Qualitative Information about Level 3 Fair Value Measurements

As of March 31, 2020 and December 31, 2019, the significant unobservable inputs used in the fair value measurement of the Company’s liabilities designated as Level 3 are as follows:

			Percent Used (Weighted Average)
Item Measured at Fair Value	Valuation Technique	Description of Significant Unobservable Input	March 31, 2020	December 31, 2019
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	15%	14%
		Credit-adjusted risk-free rate	16%	16%

Sensitivity of Level 3 Inputs - Warranty Obligations

Each of the significant unobservable inputs is independent of the other. The profit element and risk premium are estimated based on requirements of a third-party participant willing to assume the Company’s warranty obligations. The credit‑adjusted risk‑free rate (“discount rate”) is determined by reference to the Company’s own credit standing at the fair value measurement date. Increasing the profit element and risk premium input by 100 basis points would result in a $0.2 million increase to the liability. Decreasing the profit element and risk premium by 100 basis points would result in a $0.2 million reduction of the liability. Increasing the discount rate by 100 basis points would result in a $0.9 million reduction of the liability. Decreasing the discount rate by 100 basis points would result in a $1.0 million increase to the liability.

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NET INCOME PER SHARE - Schedule of Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Numerator:
Net income	$ 68,936	$ 2,765
Notes due 2023 interest and financing costs, net	44	0
Adjusted net income	$ 68,980	$ 2,765
Denominator:
Weighted average common shares outstanding (in shares)	123,531	108,195
Employee stock-based awards (in shares)	8,609	7,668
Warrants (in shares)	2,128	0
Weighted average common shares outstanding for diluted calculation (in shares)	138,104	115,863
Net income per share, basic (in USD per share)	$ 0.56	$ 0.03
Net income per share, diluted (in USD per share)	$ 0.50	$ 0.02
Convertible Notes | Convertible Senior Notes Due 2024
Denominator:
Notes due (in shares)	2,936	0
Convertible Notes | Convertible Senior Notes Due 2023
Denominator:
Notes due (in shares)	900	0

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DEBT - Schedule of Convertible Senior Notes due 2024 (Details) - Convertible Notes - Convertible Senior Notes Due 2024 $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Contractual interest expense	$ 330
Amortization of debt discount	1,562
Amortization of debt issuance costs	166
Total interest cost recognized	$ 2,058

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DEBT - Convertible Note Embedded Derivative (Details) $ in Thousands	1 Months Ended
	Mar. 31, 2020 USD ($)
Debt Instrument [Line Items]
Embedded derivative, ending balance	$ 45,100
Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Embedded derivative, beginning balance	68,700
Embedded derivative, change in the fair value	(23,600)
Embedded derivative, ending balance	$ 45,100

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COMMITMENTS AND CONTINGENT LIABILITIES - Narrative (Details) - USD ($)	Mar. 31, 2020	Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Term of lease contract, maximum renewal term	12 years
Purchase obligation	$ 95,600,000
Line of Credit Facility [Line Items]
Letters of credit outstanding	0
Letter of credit
Line of Credit Facility [Line Items]
Line of credit	44,700,000	$ 44,700,000
Collateralized letter of credit	$ 44,700,000

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NET INCOME PER SHARE (Tables)

3 Months Ended

Mar. 31, 2020

Earnings Per Share [Abstract]

Schedule of Computation of Basic and Diluted Net Loss Per Share

The following table presents the computation of basic and diluted net income per share for the periods presented.

	Three Months Ended March 31,
	2020		2019
	(In thousands, except per share data)
Numerator:
Net income	$	68,936	$	2,765
Notes due 2023 interest and financing costs, net	44		—
Adjusted net income	$	68,980	$	2,765
Denominator:
Shares used in basic per share amounts:
Weighted average common shares outstanding	123,531		108,195
Shares used in diluted per share amounts:
Weighted average common shares outstanding	123,531		108,195
Effect of dilutive securities:
Employee stock-based awards	8,609		7,668
Warrants (issued in conjunction with Notes due 2024)	2,128		—
Notes due 2024	2,936		—
Notes due 2023	900		—
Weighted average common shares outstanding for diluted calculation	138,104		115,863
Basic and diluted net income per share
Net income per share, basic	$	0.56	$	0.03
Net income per share, diluted	$	0.50	$	0.02

Schedule of Potentially Dilutive Securities Excluded from the Computation of Diluted Net Loss Per Share

The following outstanding shares of common stock equivalents were excluded from the calculation of the diluted net income per share attributable to common stockholders because their effect would have been antidilutive.

	Three Months Ended March 31,
	2020	2019
	(In thousands)
Employee stock options	—	112
RSUs and PSUs	—	91
Notes due 2023	—	11,701
Total	—	11,904

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REVENUE RECOGNITION - Summary of Significant Changes in the Balances of Contract Liabilities and Assets (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($)
Contract Assets
Balance, beginning of period	$ 57,142
Revenue recognized	(4,140)
Increase	8,287
Balance, end of period	61,289
Contract Liabilities
Balance, beginning of period	181,987
Revenue recognized	(55,373)
Increase due to billings	18,613
Balance, end of period	$ 145,227

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OTHER FINANCIAL INFORMATION - Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 5,018	$ 4,197
Finished goods	29,599	27,859
Total inventory	$ 34,617	$ 32,056

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COMMITMENTS AND CONTINGENT LIABILITIES

3 Months Ended

Mar. 31, 2020

Commitments and Contingencies Disclosure [Abstract]

COMMITMENTS AND CONTINGENT LIABILITIES

COMMITMENTS AND CONTINGENT LIABILITIES

Operating Leases

The Company leases office facilities under noncancelable operating leases that expire on various dates through 2028, some of which may include options to extend the leases for up to 12 years.

The components of lease expense are presented as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Operating lease costs	$	1,222	$	499

The components of lease liabilities are presented as follows:

	March 31, 2020		December 31, 2019
	(In thousands)
Operating lease liabilities, current (Accrued liabilities)	$	3,511	$	3,170
Operating lease liabilities, noncurrent (Other liabilities)	10,972		9,542
Total operating lease liabilities	$	14,483	$	12,712
Supplemental lease information:
Weighted average remaining lease term	5.6 years		5.5 years
Weighted average discount rate	8.3%		8.6%

Supplemental cash flow and other information related to operating leases, are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$	1,014	$	737
Non-cash investing activities:
Lease liabilities arising from obtaining right-of-use assets	$	2,941	$	—

Undiscounted cash flows of operating lease liabilities as of March 31, 2020 are as follows:

	Lease Amounts
	(In thousands)
Year:
2020 (remaining nine months)	$	3,432
2021	4,651
2022	3,337
2023	2,619
2024	1,415
2025 and thereafter	1,902
Total lease payments	17,356
Less: imputed lease interest	(2,873		)
Total lease liabilities	$	14,483

Purchase Obligations

The Company has contractual obligations related to component inventory that its primary contract manufacturer procures on its behalf in accordance with its production forecast as well as other inventory related purchase commitments. As of March 31, 2020, these purchase obligations totaled approximately $95.6 million.

Letter of Credits

As of both March 31, 2020 and December 31, 2019, the Company had a standby letter of credit in the aggregate amount of $44.7 million, primarily in connection with one of its customer contracts. The letter of credit served as a performance security for product delivered to the customer during the three months ended March 31, 2020 and expired on April 30, 2020. The Company had collateralized under the letter of credit a certificate of deposit of $44.7 million. No amounts have been drawn against this letter of credit.

Litigation

From time-to-time, the Company may be involved in litigation relating to claims arising out of its operations. The Company is not currently involved in any material legal proceedings; however, the Company may be involved in material legal proceedings in the future. Such matters are subject to uncertainty and there can be no assurance that such legal proceedings will not have a material effect on its business, results of operations, financial position or cash flows.

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WARRANTY OBLIGATIONS

3 Months Ended

Mar. 31, 2020

Product Warranties Disclosures [Abstract]

WARRANTY OBLIGATIONS

WARRANTY OBLIGATIONS

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2020			2019
	(In thousands)
Warranty obligations, beginning of period	$	37,098		$	31,294
Accruals for warranties issued during period	1,524			858
Changes in estimates	1,677			804
Settlements	(3,270		)	(2,296		)
Increase due to accretion expense	774			551
Other	(302		)	(169		)
Warranty obligations, end of period	37,501			31,042
Less: current portion	(9,678		)	(7,925		)
Noncurrent	$	27,823		$	23,117

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NET INCOME PER SHARE - Schedule of Potentially Dilutive Securities Excluded from the Computation of Diluted Net Loss Per Share (Details) - shares shares in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	11,904
Employee stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	112
RSUs and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	91
Convertible Senior Notes Due 2023 | Convertible Notes Payable
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	0	11,701

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DEBT - Sale of Long - Term Financing Receivables (Details) - USD ($) $ in Millions	1 Months Ended	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2018
Financing Receivable | Financing Receivable Recorded As Debt
Debt Instrument [Line Items]
Proceeds from debt, net of issuance costs	$ 2.8	$ 5.6

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DEBT - Convertible Senior Notes due 2024 (Details) $ / shares in Units, shares in Millions		3 Months Ended
	Jun. 05, 2019 USD ($) trading_day $ / shares shares	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Debt, current		$ 395,783,000		$ 105,543,000
Deferred tax assets, net		86,806,000		74,531,000
Payment for bonds hedge		89,056,000	$ 0
Proceeds from sale of warrants	$ 29,800,000	71,552,000	$ 0
Convertible Notes | Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Debt instrument face amount	$ 132,000,000.0
Interest rate	1.00%
Debt conversion price (in USD per share) | $ / shares	$ 20.5010
Proceeds from convertible debt	$ 128,000,000.0
Debt, current		$ 97,913,000		96,185,000
Convertible note, liability component	$ 95,600,000
Effective percentage rate	7.75%	7.75%
Convertible note, equity component	$ 36,400,000
Deferred tax assets, net	300,000
Debt issuance costs	4,600,000
Unamortized debt issuance costs	3,300,000	$ 2,800,000		2,900,000
Debt issuance costs, allocated to capital	1,300,000
Unamortized discount		$ 31,300,000		$ 32,900,000
Remaining discount amortization period		4 years 2 months 12 days
Payment for bonds hedge	$ 36,300,000
Conversion shares (in shares) | shares	6.4
Warrants sold (in shares) | shares	6.4
Warrants issued, strike price (in USD per share) | $ / shares	$ 25.2320
Conversion ratio	0.0487781
Period One | Convertible Notes | Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Number of threshold trading days | trading_day	20
Number of consecutive trading days | trading_day	30
Stock trigger price (in USD per share) | $ / shares	$ 26.6513
Threshold percentage	130.00%
Measurement period percentage of stock price trigger	98.00%
Period Two | Convertible Notes | Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Threshold percentage	100.00%

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DEBT - Convertible Senior Notes due in 2025 (Details) $ / shares in Units, shares in Millions			3 Months Ended
	Mar. 09, 2020 USD ($) trading_day $ / shares shares	Jun. 05, 2019 USD ($)	Mar. 31, 2020 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2019 USD ($)
Debt Instrument [Line Items]
Convertible notes embedded derivative			$ 45,100,000
Payment for bonds hedge			89,056,000	$ 0
Proceeds from sale of warrants		$ 29,800,000	71,552,000	$ 0
Hedging liabilities			47,885,000		$ 0
Warrants liability			38,637,000		0
Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Debt instrument face amount	$ 320,000,000.0
Interest rate	0.25%
Conversion ratio	0.0122637
Debt conversion price (in USD per share) | $ / shares	$ 81.54
Proceeds from convertible debt	$ 313,000,000.0
Convertible notes embedded derivative	68,700,000		$ 45,100,000		$ 0
Embedded derivative, host contract	251,300,000
Effective percentage rate			5.18%
Debt issuance costs	7,600,000
Unamortized discount			$ 68,000,000.0
Remaining discount amortization period			4 years 10 months 24 days
Payment for bonds hedge	$ 89,100,000
Conversion shares (in shares) | shares	3.9
Warrants issued, strike price (in USD per share) | $ / shares	$ 106.94
Proceeds from sale of warrants	$ 71,600,000
Hedging liabilities	89,056,000		$ 47,885,000
Warrants liability	$ 71,552,000		$ 38,637,000
Period One | Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Number of threshold trading days | trading_day	20
Number of consecutive trading days | trading_day	30
Threshold percentage	130.00%
Period Two | Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Measurement period percentage of stock price trigger	98.00%
Threshold percentage	100.00%

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STOCK-BASED COMPENSATION - Valuation of Equity Awards - Narrative (Details) - shares	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Payment Arrangement [Abstract]
Grants in period (in shares)	0	0

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COMMITMENTS AND CONTINGENT LIABILITIES - Supplemental Cash Flow and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Operating cash flows from operating leases	$ 1,014	$ 737
Lease liabilities arising from obtaining right-of-use assets	$ 2,941	$ 0

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross	$ 24,783	$ 24,783
Goodwill, Net	24,783	24,783
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Other indefinite-lived intangibles, Gross	286	286
Intangible assets with finite lives:
Gross	36,486	36,486
Accumulated Amortization	(7,154)	(5,907)
Net	29,332	30,579
Developed technology
Intangible assets with finite lives:
Gross	13,100	13,100
Accumulated Amortization	(3,639)	(3,093)
Net	9,461	10,007
Customer relationship
Intangible assets with finite lives:
Gross	23,100	23,100
Accumulated Amortization	(3,515)	(2,814)
Net	$ 19,585	$ 20,286

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FAIR VALUE MEASUREMENTS - Narrative (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 09, 2020	Jun. 05, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase in liability as a result of increasing the profit element and risk premium input by 100 basis points	$ 200,000
Decrease in liability as a result of decreasing the profit element and risk premium input by 100 basis points	200,000
Decrease in liability as a result of increasing the discount rate by 100 basis points	900,000
Increase in liability as a result of decreasing the discount rate by 100 basis points	1,000,000.0
Convertible Notes | Convertible Senior Notes Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument face amount		$ 320,000,000.0
Interest rate		0.25%
Debt conversion price (in USD per share)		$ 81.54
Convertible Notes | Convertible Senior Notes Due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt instrument face amount			$ 132,000,000.0
Interest rate			1.00%
Debt conversion price (in USD per share)			$ 20.5010
Convertible Notes | Minimum | Convertible Senior Notes Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt conversion price (in USD per share)		81.54
Convertible Notes | Maximum | Convertible Senior Notes Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Debt conversion price (in USD per share)		$ 106.94
Level 1 | Money market funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash and cash equivalents	542,200,000
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2025
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	262,300,000
Level 2 | Recurring | Convertible Notes | Convertible Senior Notes Due 2024
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Notes payable fair value	$ 252,900,000

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DEBT - Long-term debt (Details) - USD ($) $ in Thousands		Mar. 31, 2020	Mar. 09, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total carrying amount of debt		$ 395,783		$ 105,543
Convertible notes embedded derivative		45,100
Less: current portion of convertible notes and long-term financing receivable recorded as debt		(100,567)		(2,884)
Long-term debt	[1]	295,216		102,659
Convertible Notes | Convertible Senior Notes Due 2025
Debt Instrument [Line Items]
Long-term debt, gross		320,000		0
Less unamortized discount and issuance costs		(75,450)		0
Total carrying amount of debt		244,550		0
Convertible notes embedded derivative		45,100	$ 68,700	0
Convertible Notes | Convertible Senior Notes Due 2024
Debt Instrument [Line Items]
Long-term debt, gross		132,000		132,000
Less unamortized discount and issuance costs		(34,087)		(35,815)
Total carrying amount of debt		97,913		96,185
Convertible Notes | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Long-term debt, gross		5,000		5,000
Less unamortized discount and issuance costs		(132)		(143)
Total carrying amount of debt		4,868		4,857
Financing Receivable | Financing Receivable Recorded as Debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 3,352		$ 4,501

[1] Debt, noncurrent balance as of March 31, 2020, includes Convertible Notes due 2025 embedded derivative balance of $45.1 million. See Note 8, “Debt,” of the notes to condensed consolidated financial statements included in Part I, Item 1 of this Form 10-Q for further details.

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DEBT (Tables)

3 Months Ended

Mar. 31, 2020

Debt Disclosure [Abstract]

Schedule of Debt

The following table provides information regarding the Company’s long-term debt.

	March 31, 2020			December 31, 2019
	(In thousands)
Convertible notes
Notes due 2025	$	320,000		$	—
Less: unamortized discount and issuance costs	(75,450		)	—
Carrying amount of Notes due 2025	244,550			—
Notes due 2025 embedded derivative	45,100			—
Notes due 2024	132,000			132,000
Less: unamortized discount and issuance costs	(34,087		)	(35,815		)
Carrying amount of Notes due 2024	97,913			96,185
Notes due 2023	5,000			5,000
Less: unamortized issuance costs	(132		)	(143		)
Carrying amount of Notes due 2023	4,868			4,857
Sale of long-term financing receivable recorded as debt	3,352			4,501
Total carrying amount of debt	395,783			105,543
Less: current portion of convertible notes and long-term financing receivable recorded as debt	(100,567		)	(2,884		)
Long-term debt	$	295,216		$	102,659

The following table presents the total amount of interest cost recognized relating to the Notes due 2025:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	49
Amortization of debt discount	743
Amortization of debt issuance costs	87
Total interest cost recognized	$	879

The following table presents the total amount of interest cost recognized relating to the Notes due 2024:

	Three Months Ended March 31, 2020
	(In thousands)
Contractual interest expense	$	330
Amortization of debt discount	1,562
Amortization of debt issuance costs	166
Total interest cost recognized	$	2,058

The following table presents the amount of interest cost recognized relating to the contractual interest coupon and the amortization of debt issuance costs of the Notes due 2023.

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Contractual interest expense	$	50	$	650
Amortization of debt issuance costs	10		129
Total interest costs recognized	$	60	$	779

Schedule of Fair Value and Change in Fair Value Of Convertible Note Embedded Derivative

The following table presents the fair value and the change in fair value for convertible note embedded derivative (in thousands):

Convertible note embedded derivative
Fair value as of March 09, 2020	$	68,700
Change in the fair value	(23,600		)
Fair value as of March 31, 2020	$	45,100

Schedule of Fair Value Of Convertible Notes Hedge and Warrants Liability

The following table presents the Company’s assets and liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy.

	March 31, 2020				December 31, 2019
	(In thousands)
	Level 2		Level 3		Level 2		Level 3
Assets:
Convertible notes hedge	$	47,885	$	—	$	—	$	—
Liabilities:
Debt, non-current
Convertible notes embedded derivative	45,100		—		—		—
Warrants liability	38,637		—		—		—
Warranty obligations
Current	—		6,578		—		6,794
Non-current	—		13,847		—		13,012
Total warranty obligations measured at fair value	—		20,425		—		19,806
Total liabilities measured at fair value	$	83,737	$	20,425	$	—	$	19,806

The following table presents the fair value and the change in fair value for Convertible notes hedge and Warrants liability (in thousands):

	Convertible notes hedge			Warrants liability
	(In thousands)
Fair value as of March 09, 2020	$	89,056		$	71,552
Change in the fair value	(41,171		)	(32,915		)
Fair value as of March 31, 2020	$	47,885		$	38,637

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GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2020

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

The Company’s goodwill and purchased intangible assets as of March 31, 2020 and December 31, 2019 are as follows:

	March 31, 2020							December 31, 2019
	Gross		Accumulated Amortization			Net		Gross		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	24,783	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—		$	286
Intangible assets with finite lives:
Developed technology	13,100		(3,639		)	9,461		13,100		(3,093		)	10,007
Customer relationships	23,100		(3,515		)	19,585		23,100		(2,814		)	20,286
Total purchased intangible assets	$	36,486	$	(7,154	)	$	29,332	$	36,486	$	(5,907	)	$	30,579

Schedule of Amortization Expense

Amortization expense related to finite-lived intangible assets are as follows:

	Three Months Ended March 31,
	2020		2019
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	546
Customer relationships	701		636
Total amortization expense	$	1,247	$	1,182

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RELATED PARTY

3 Months Ended

Mar. 31, 2020

Related Party Transactions [Abstract]

RELATED PARTY

RELATED PARTY

In 2018, a member of the Company’s board of directors and one of its principal stockholders, Thurman John Rodgers, purchased $5.0 million aggregate principal amount of the Notes due 2023 in a concurrent private placement. As of both March 31, 2020 and December 31, 2019, $5.0 million aggregate principal amount of the Notes due 2023 were outstanding. See Note 8. “Debt” for additional information related to this purchase.

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Cash flows from operating activities:
Net income	$ 68,936	$ 2,765
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	3,844	3,572
Provision for doubtful accounts	104	0	$ 217
Non-cash interest expense	2,722	1,490
Financing fees on extinguishment of debt	0	2,152
Stock-based compensation	7,515	3,290
Change in fair value of derivatives	(15,344)	0
Deferred income taxes	(12,500)	0
Changes in operating assets and liabilities:
Accounts receivable	49,637	(3,266)
Inventory	(2,560)	3,296
Prepaid expenses and other assets	(5,009)	(2,413)
Accounts payable, accrued and other liabilities	(22,066)	4,851
Warranty obligations	403	(252)
Deferred revenues	(36,460)	1,578
Net cash provided by operating activities	39,222	17,063
Cash flows from investing activities:
Purchases of property and equipment	(3,353)	(658)
Net cash used in investing activities	(3,353)	(658)
Cash flows from financing activities:
Issuance of convertible notes, net of issuance costs	313,011	0
Purchase of convertible note hedges	(89,056)	0
Sale of warrants	71,552	0
Principal payments and financing fees on debt	(1,148)	(44,731)
Proceeds from exercise of equity awards and employee stock purchase plan	1,979	1,664
Payment of withholding taxes related to net share settlement of equity awards	(34,267)	(1,355)
Net cash provided by (used in) financing activities	262,071	(44,422)
Effect of exchange rate changes on cash and cash equivalents	(205)	(133)
Net increase (decrease) in cash, cash equivalents, and restricted cash	297,735	(28,150)
Cash, cash equivalents and restricted cash—Beginning of period	296,109	106,237	106,237
Cash, cash equivalents and restricted cash—End of period	593,844	78,087	296,109
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents				$ 549,144	$ 251,409	$ 78,087
Restricted cash				44,700	44,700	0
Total cash, cash equivalents, and restricted cash	593,844	78,087	$ 106,237	$ 593,844	$ 296,109	$ 78,087
Supplemental disclosures of non-cash investing and financing activities:
Purchases of fixed assets included in accounts payable	585	458
Convertible senior note issuance costs included in accounts payable and accrued expense	$ 591	$ 0

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Statement of Financial Position [Abstract]
Allowances, accounts receivable	$ 374	$ 564
Warranty obligations, current at fair value	6,578	6,794
Warranty obligations, non-current at fair value	$ 13,847	$ 13,012
Common stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	125,072,000	123,109,000
Common stock, shares outstanding (in shares)	125,072,000	123,109,000