10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 10-Q

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

For the quarterly period ended March 31, 2019

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)	(Zip Code)

(707) 774-7000

(Registrant’s telephone number, including area code)

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

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

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

Large accelerated filer	¨	Accelerated filer	x
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  x

As of April 23, 2019, there were 110,226,728 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, 2019

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 (Loss)	3
	Condensed Consolidated Statements of Stockholders’ Equity (Deficit)	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	22
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	27
Item 4.	Controls and Procedures	27
	PART II. OTHER INFORMATION
Item 1.	Legal Proceedings	28
Item 1A.	Risk Factors	28
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	28
Item 3.	Defaults Upon Senior Securities	28
Item 4.	Mine Safety Disclosures	28
Item 5.	Other Information	28
Item 6.	Exhibits	29
	Signature	30

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements (Unaudited)

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except par value)
(Unaudited)

	March 31, 2019			December 31, 2018
ASSETS
Current assets:
Cash and cash equivalents	$	78,087		$	106,237
Accounts receivable, net	81,715			78,938
Inventory	12,971			16,267
Prepaid expenses and other assets	22,669			20,860
Total current assets	195,442			222,302
Property and equipment, net	20,178			20,998
Operating lease, right of use asset	7,963			—
Intangible assets, net	34,124			35,306
Goodwill	24,783			24,783
Other assets	36,762			36,548
Total assets	$	319,252		$	339,937
LIABILITIES AND STOCKHOLDERS’ EQUITY
Current liabilities:
Accounts payable	$	52,489		$	48,794
Accrued liabilities	32,431			29,010
Deferred revenues, current	32,916			33,119
Warranty obligations	7,925			8,083
Debt, current	2,985			28,155
Total current liabilities	128,746			147,161
Long-term liabilities:
Deferred revenues, noncurrent	78,393			76,911
Warranty obligations, noncurrent	23,117			23,211
Other liabilities	9,466			3,250
Debt, noncurrent	65,406			81,628
Total liabilities	305,128			332,161
Commitments and contingent liabilities (Note 9)
Stockholders’ equity:
Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding	—			—
Common stock, $0.00001 par value, 150,000 shares and 150,000 shares authorized; and 110,211 shares and 107,035 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	1			1
Additional paid-in capital	357,023			353,335
Accumulated deficit	(343,563		)	(346,302		)
Accumulated other comprehensive income	663			742
Total stockholders’ equity	14,124			7,776
Total liabilities and stockholders’ equity	$	319,252		$	339,937

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 1

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

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

	Three Months Ended March 31,
	2019			2018
Net revenues	$	100,150		$	69,972
Cost of revenues	66,811			51,657
Gross profit	33,339			18,315
Operating expenses:
Research and development	8,524			7,620
Sales and marketing	7,433			6,227
General and administrative	9,880			6,943
Restructuring charges	368			—
Total operating expenses	26,205			20,790
Income (loss) from operations	7,134			(2,475		)
Other expense, net
Interest expense	(3,540		)	(2,292		)
Other expense	(481		)	(126		)
Total other expense, net	(4,021		)	(2,418		)
Income (loss) before income taxes	3,113			(4,893		)
Provision for income taxes	(348		)	(235		)
Net income (loss)	$	2,765		$	(5,128	)
Net income (loss) per share:
Basic	$	0.03		$	(0.06	)
Diluted	$	0.02		$	(0.06	)
Shares used in per share calculation:
Basic	108,195			91,422
Diluted	115,863			91,422

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 2

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS)

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2019			2018
Net income (loss)	$	2,765		$	(5,128	)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(79		)	288
Comprehensive income (loss)	$	2,686		$	(4,840	)

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 3

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER’S EQUITY (DEFICIT)

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2019			2018
Common stock and paid-in capital
Balance, beginning of period	$	353,336		$	287,257
Cumulative-effect adjustment to additional paid in capital (1)	26			—
Common stock issued under equity incentive and stock purchase plans, net	309			269
Issuance of common stock, net	—			19,923
Stock-based compensation expense and other	3,353			1,571
Balance, end of period	$	357,024		$	309,020
Retained earnings
Balance, beginning of period	$	(346,302	)	$	(295,727	)
Cumulative-effect adjustment to accumulated deficit (1)	(26		)	(38,948		)
Net income (loss)	2,765			(5,128		)
Balance, end of period	$	(343,563	)	$	(339,803	)
Accumulated other comprehensive income (loss)
Balance, beginning of period	$	742		$	(656	)
Foreign currency translation adjustments	(79		)	288
Balance, end of period	$	663		$	(368	)
Total stockholders’ equity, ending balance	$	14,124		$	(31,151	)

(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 and the adoption of Accounting Standards Codification (“ASC”) No. 606, “Revenue Recognition” on January 1, 2018.

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 4

ENPHASE ENERGY, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)
(Unaudited)

	Three Months Ended March 31,
	2019			2018
Cash flows from operating activities:
Net income (loss)	$	2,765		$	(5,128	)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,572			2,276
Provision for doubtful accounts	—			600
Amortization of debt issuance costs	1,490			537
Financing fees on extinguishment of debt	2,152			—
Stock-based compensation	3,290			1,571
Changes in operating assets and liabilities:
Accounts receivable	(3,266		)	9,125
Inventory	3,296			7,457
Prepaid expenses and other assets	(2,413		)	(1,039		)
Accounts payable, accrued and other liabilities	4,851			(11,667		)
Warranty obligations	(252		)	809
Deferred revenues	1,578			(1,180		)
Net cash provided by operating activities	17,063			3,361
Cash flows from investing activities:
Purchases of property and equipment	(658		)	(1,043		)
Net cash used in investing activities	(658		)	(1,043		)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	—			19,923
Proceeds from debt, net of issuance costs	—			2,309
Principal payments and financing fees on debt	(44,731		)	(771		)
Proceeds from issuance of common stock under employee stock plans, net	309			269
Net cash provided by (used in) financing activities	(44,422		)	21,730
Effect of exchange rate changes on cash	(133		)	63
Net increase (decrease) in cash and cash equivalents	(28,150		)	24,111
Cash and cash equivalents—Beginning of period	106,237			29,144
Cash and cash equivalents—End of period	$	78,087		$	53,255
Supplemental disclosures of non-cash investing and financing activities:
Purchases of fixed assets included in accounts payable	$	458		$	117
Operating lease, right of use asset	$	8,392		$	—

See Notes to Condensed Consolidated Financial Statements.

Enphase Energy, Inc. | Q1 2019 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 connect solar generation, storage and management on one intelligent platform. The Company revolutionized solar 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. The year-end condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the U.S. The Company filed audited consolidated financial statements, which included all information and notes necessary for such a complete presentation in conjunction with its 2018 Annual Report on Form 10-K.

Unaudited Interim Financial Information

These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (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 (loss) and cash flows for the interim periods indicated. The results of operations for the three months ended March 31, 2019 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, inventory valuation and accrued warranty obligations. 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.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 6

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Recently Adopted Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842).” ASU 2016-02 requires an entity to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. The guidance requires lessees to recognize all leases, with certain exceptions, on their balance sheets, whether operating or financing, while continuing to recognize the expenses on their income statements in a manner similar to current practice. The guidance states that a lessee must recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. On January 1, 2019, the Company adopted ASU 2016-02 using the modified retrospective transition option of applying the new standard at the adoption date for all leases with terms greater than 12 months. The Company elected certain practical expedients upon adoption and as such did not reassess the following: 1) whether any expired or existing contracts are or contain leases; 2) lease classification for any expired or existing leases; 3) initial direct costs for any expired or existing leases; 4) whether existing or expired land easements are or contain leases; and 5) regarding the lease term, from a hindsight perspective, whether or not the Company is reasonably certain to exercise the lease options. However, the Company will evaluate new or modified land easements under the new guidance after the commencement date. The Company also elected the practical expedient to not separate lease and non-lease components. The adoption of ASU 2016-02 on January 1, 2019 resulted in an increase in operating leases, right of use asset of $8.4 million, an increase in other liabilities of $6.8 million, an increase in accrued liabilities and other of $1.5 million and a decrease in other assets of $0.1 million on the Company’s consolidated balance sheets with no impact on the Company’s consolidated statements of operations.

In June 2018, the FASB issued ASU 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting.” ASU 2018-07 was issued to provide to provide guidance on share-based payments granted to non-employees in exchange for goods or services used or consumed in an entity’s own operations and supersedes the guidance in ASC 505-50, “Equity-Based Payments to Non-Employees.” ASU 2018-07 aligns much of the guidance on measuring and classifying non-employee awards with that of awards to employees. The Company adopted ASU 2018-07 on January 1, 2019 a modified retrospective basis. The adopted standard did not have a material impact on the consolidated financial statements.

Recently Issued Accounting Pronouncements Not Yet Effective

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 is currently evaluating the impact this update will have on its consolidated financial statements.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 7

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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. The following table provides information about disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line:

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Primary geographical markets:
United States	$	77,686	$	43,130
International	22,464		26,842
Total	$	100,150	$	69,972
Timing of revenue recognition:
Products delivered at a point in time	$	90,400	$	59,371
Products and services delivered over time	9,750		10,601
Total	$	100,150	$	69,972

Contract Balances

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

	March 31, 2019		December 31, 2018
	(In thousands)
Receivables	$	81,715	$	78,938
Short-term contract assets (Prepaid expenses and other assets)	13,595		13,516
Long-term contract assets (Other assets)	34,683		34,148
Short-term contract liabilities (Deferred revenues)	32,916		33,119
Long-term contract liabilities (Deferred revenues)	78,393		76,911

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, 2019. 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 assets (prepaid expenses and other assets) and contract liabilities (deferred revenues) during the period are as follows (in thousands):

Contract Assets
Balance on December 31, 2018	$	47,664
Amount recognized	(3,594		)
Increase	4,208
Balance as of March 31, 2019	$	48,278

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 8

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

Contract Liabilities
Balance on December 31, 2018	$	110,030
Revenue recognized	(9,750		)
Increase due to billings	11,029
Balance as of March 31, 2019	$	111,309

Remaining Performance Obligations

The following table includes 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.

	March 31, 2019
	(In thousands)
Fiscal year:
2019 (remaining nine months)	$	26,092
2020	27,797
2021	21,626
2022	16,594
2023	10,801
Thereafter	8,399
Total	$	111,309

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 9

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

3. OTHER FINANCIAL INFORMATION

Accounts Receivable, Net

Accounts receivable, net consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Accounts receivable	$	83,855		$	81,076
Allowance for doubtful accounts	(2,140		)	(2,138		)
Accounts receivable, net	$	81,715		$	78,938

Inventory

Inventory consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Raw materials	$	950	$	970
Finished goods	12,021		15,297
Total inventory	$	12,971	$	16,267

Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	6,442	$	4,107
Customer rebates and sales incentives	8,769		8,527
Freight	7,599		7,286
Other	9,621		9,090
Total accrued liabilities	$	32,431	$	29,010

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 10

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

4. GOODWILL AND INTANGIBLE ASSETS

The following table presents the details of the Company’s goodwill and purchased intangible assets:

	March 31, 2019							December 31, 2018
	Gross		Accumulated Amortization			Net		Gross		Additions		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	3,664	$	21,119	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—	$	—		$	286
Intangible assets with finite lives:
Patents and licensed technology	1,665		(1,665		)	—		1,665		—		(1,665		)	—
Developed technology	13,100		(1,455		)	11,645		—		13,100		(909		)	12,191
Customer relationships	23,100		(907		)	22,193		—		23,100		(271		)	22,829
Total purchased intangible assets	$	38,151	$	(4,027	)	$	34,124	$	1,951	$	36,200	$	(2,845	)	$	35,306

In August 2018, the Company acquired certain finite-lived intangible assets in its acquisition of SunPower Corporation’s (“SunPower”) microinverter business pursuant to an Asset Purchase Agreement (“APA”), primarily developed technology and customer relationships. See Note 20. “Acquisition,” of the notes to consolidated financial statements included in Item 8 of the Company’s 2018 Form 10‑K filed with the SEC on March 15, 2019 for additional information related to this acquisition.

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

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	76
Customer relationships	636		—
Total amortization expense	$	1,182	$	76

Amortization of developed technology, patents and licensed technology is primarily recorded to sales and marketing expense. The developed technology acquired from the Company’s acquisition of SunPower’s microinverter business is embedded in the microinverters that SunPower sells 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 service agreement (“MSA”) negotiated 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 the 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.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 11

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

5. WARRANTY OBLIGATIONS

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2019			2018
	(In thousands)
Warranty obligations, beginning of period	$	31,294		$	29,816
Accruals for warranties issued during period	858			758
Changes in estimates	804			1,450
Settlements	(2,296		)	(1,676		)
Increase due to accretion expense	551			419
Other	(169		)	(142		)
Warranty obligations, end of period	31,042			30,625
Less current portion	(7,925		)	(7,699		)
Noncurrent	$	23,117		$	22,926

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.

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 liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy:

	Fair Value Hierarchy	March 31, 2019		December 31, 2018
		(In thousands)
Warranty obligations
Current		$	4,237	$	4,288
Non-current		7,828		7,469
Total warranty obligations	Level 3	$	12,065	$	11,757

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 12

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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,
	2019			2018
	(In thousands)
Balance at beginning of period	$	11,757		$	9,791
Accruals for warranties issued during period	858			758
Changes in estimates	341			1,785
Settlements	(1,272		)	(891		)
Increase due to accretion expense	551			419
Other	(170		)	(142		)
Balance at end of period	$	12,065		$	11,720

Quantitative and Qualitative Information about Level 3 Fair Value Measurements

As of March 31, 2019 and December 31, 2018, 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, 2019	December 31, 2018
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	14%	16%
		Credit-adjusted risk-free rate	18%	19%

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 $0.1 million increase to the liability. Decreasing the profit element and risk premium by 100 basis points would result in a $0.1 million reduction of the liability. Increasing the discount rate by 100 basis points would result in a $0.5 million reduction of the liability. Decreasing the discount rate by 100 basis points would result in a $0.5 million increase to the liability.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 13

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

7. RESTRUCTURING

Restructuring expense consist of the following:

	Three Months Ended March 31,
	2019			2018
	(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 expects to complete this restructuring in 2019.

The following table provides information regarding changes in the Company’s 2018 Plan accrued restructuring balance for the periods indicated:

	Redundancy and Employee Severance and Benefits			Lease Loss Reserves and Contractual Obligations			Total
	(In thousands)
Balance as of December 31, 2018	$	904		$	288		$	1,192
Charges	468			—			468
Cash payments	(752		)	—			(752		)
Non-cash settlement and other	(55		)	(288		)	(343		)
Balance as of March 31, 2019	$	565		$	—		$	565

2016 Plan

In the third quarter of 2016, the Company began implementing restructuring actions (the “2016 Plan”) to lower its operating expenses. The restructuring actions have included reductions in the Company’s global workforce, the elimination of certain non-core projects, consolidation of office space at the Company’s corporate headquarters and the engagement of management consultants to assist the Company in making organizational and structural changes to improve operational efficiencies and reduce expenses. The Company substantially completed its restructuring activities under the 2016 Plan in 2017.

The following table provides information regarding changes in the Company’s 2016 Plan accrued restructuring balance for the periods indicated:

	Lease Loss Reserves and Contractual Obligations
	(In thousands)
Balance as of December 31, 2018	$	1,591
Other (1)	(1,591		)
Balance as of March 31, 2019	$	—

(1) Adoption of ASU 2016-02.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 14

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

8. DEBT

Long-term debt was comprised of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Convertible notes due 2023	$	65,000		$	65,000
Less unamortized issuance costs	(2,232		)	(2,361		)
Carrying amount of convertible notes due 2023	62,768			62,639
Term loan	—			41,524
Less unamortized discount and issuance costs	—			(1,059		)
Carrying amount of term loan	—			40,465
Sale of long-term financing receivable recorded as debt	5,623			6,679
Less value of future purchase option	—			—
Carrying amount of sale of long-term financing receivable recorded as debt	5,623			6,679
Total carrying amount of debt	68,391			109,783
Less current portion term loan	—			(25,417		)
Less current portion of long-term financing receivable recorded as debt	(2,985		)	(2,738		)
Long-term debt	$	65,406		$	81,628

Term Loan

In July 2016, the Company entered into a Loan and Security Agreement (the “Original Term Loan Agreement”) with lenders that are affiliates of Tennenbaum Capital Partners, LLC. In February 2017, the Company entered into an Amended and Restated Loan and Security Agreement (the “Loan Agreement”) that amended and restated the Original Term Loan Agreement. The Loan Agreement provided for a $25.0 million secured term loan to the Company (the “New Term Loan”), which is in addition to the $25.0 million secured term loan borrowed by the Company under the Original Term Loan Agreement (together with the “New Term Loan” the “Term Loans”).

On January 28, 2019, the Company repaid in full the remaining principal amount of the Term Loans of approximately $39.5 million plus accrued interest and fees.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 15

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 terms of the lease agreements generally provide for rental payments on a graduated basis, and certain leases require the Company to pay its portion of executory costs such as taxes, insurance, and operating expenses. The Company recognizes rent expense on a straight-line basis over the lease term.

The components of lease expense are presented as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Operating lease cost	$	499

The components of lease liabilities are presented as follows:

	March 31, 2019
	(In thousands)
Lease liabilities, current (Accrued liabilities)	$	2,181
Lease liabilities, non-current (Other liabilities)	7,837
Total lease liabilities	$	10,018

Supplemental lease information
Weighted average remaining lease term	4.4 years
Weighted average discount rate	9.2%

Other information related to operating leases, are as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities	$	737

Maturities of lease liabilities as of March 31, 2019 are as follows:

	Lease Amounts
	(In thousands)
Year:
2019 (remaining nine months)	$	2,248
2020	3,071
2021	3,155
2022	1,717
2023	893
Thereafter	1,227
Total	12,311
Less imputed lease interest	(2,293		)
Total lease liabilities	$	10,018

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 16

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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

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,
	2019		2018
	(In thousands)
Cost of revenues	$	231	$	198
Research and development	716		618
Sales and marketing	999		361
General and administrative	1,288		394
Restructuring	55		—
Total	$	3,289	$	1,571

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

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Stock options, RSUs, and PSUs	$	3,222	$	1,317
Employee stock purchase plan	67		254
Total	$	3,289	$	1,571

As of March 31, 2019, there was approximately $30.3 million of total unrecognized stock-based compensation expense related to unvested equity awards expected to be recognized over a weighted-average period of 2.1 years.

No income tax benefit has been recognized relating to stock-based compensation expense and no tax benefits have been realized from exercised stock options for the three months ended March 31, 2019.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 17

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 with the following assumptions:

• Expected term—The expected term of the option awards represents the period of time between the grant date of the option awards and the date the option awards are either exercised, converted or canceled, including an estimate for those option awards still outstanding. The Company used the simplified method, as permitted by the SEC for companies with a limited history of stock option exercise activity, to determine the expected term for its option grants.

• Expected volatility—The expected volatility was calculated based on the Company’s historical stock prices, supplemented as necessary with historical volatility of the common stock of several peer companies with characteristics similar to those of the Company.

• Risk-free interest rate—The risk-free interest rate was based on the U.S. Treasury yield curve in effect at the time of grant and with a maturity that approximated the Company’s expected term.

• Dividend yield—The dividend yield was based on the Company’s dividend history and the anticipated dividend payout over its expected term.

The following table presents the weighted-average grant date fair value of options granted for the periods presented and the assumptions used to estimate those values using a Black-Scholes option pricing model:

	Three Months Ended March 31,
	2019	2018
Weighted average grant date fair value	**	$	1.83
Expected term (in years)	**	4.2
Expected volatility	**	86.4		%
Annual risk-free rate of return	**	2.4		%
Dividend yield	**	—		%

** No stock options were granted during the period.

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. | Q1 2019 Form 10-Q | 18

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, 2018	6,772		$	1.76
Granted	—		—
Exercised	(1,573	)	1.06			$	10,715
Canceled	(55	)	5.55
Outstanding at March 31, 2019	5,144		1.94		4.8	$	37,671
Vested and expected to vest at March 31, 2019	5,144		1.94		4.8	$	37,671
Exercisable at March 31, 2019	3,318		2.20		4.6	$	23,471

(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, 2019 is based on the closing price of the Company’s stock fair value on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.

The following table summarizes information about stock options outstanding at March 31, 2019:

	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)
$0.27 —– $1.14	1,061	5.6	$	0.83	703	$	0.79
$1.29 —– $1.29	1,000	5.5	1.29		375	1.29
$1.31 —– $1.31	1,752	5.0	1.31		1,230	1.31
$1.37 —– $6.98	1,034	3.9	2.90		713	3.03
$7.01 —– $12.57	297	2.2	8.40		297	8.40
Total	5,144	4.8	1.94		3,318	2.20

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 19

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, 2018	4,352		$	3.52
Granted	1,114		8.12
Vested	(716	)	3.70			$	6,255
Canceled	(216	)	2.02
Outstanding at March 31, 2019	4,534		4.70		1.5	$	41,845
Expected to vest at March 31, 2019	4,532		4.70		1.5	$	41,835

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 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, 2018	1,330		$	4.66
Granted	1,046		9.40
Vested	(1,026	)	4.63			$	9,925
Canceled	(337	)	4.78
Outstanding at March 31, 2019	1,013		8.64		1.0	$	9,349
Expected to vest at March 31, 2019	1,013		8.64		1.0	$	9,349

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.

11. INCOME TAXES

The Company used the discrete tax approach in calculating the tax expense for the three months ended March 31, 2019 and 2018 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.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 20

ENPHASE ENERGY, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

12. NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) 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 employee stock purchase program (“ESPP”), and the convertible notes. The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income (loss) per share.

The following table presents the computation of basic and diluted net income (loss) per share for the periods presented:

	Three Months Ended March 31,
	2019		2018
	(In thousands, except per share data)
Numerator:
Net income (loss)	$	2,765	$	(5,128	)
Denominator:
Weighted average common shares outstanding	108,195		91,422
Effect of dilutive securities
Employee stock-based awards	7,668		—
Weighted average common shares outstanding for diluted calculation	115,863		91,422
Net income (loss) per share, basic	$	0.03	$	(0.06	)
Net income (loss) per share, diluted	$	0.02	$	(0.06	)

As the Company incurred a net loss for the three months ended March 31, 2018, potential dilutive securities from employee stock options, RSUs, PSUs, and shares to be purchased under the Company’s ESPP have been excluded from the diluted net loss per share computation because the effect of including such shares would have been antidilutive.

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

	Three Months Ended March 31,
	2019	2018
	(In thousands)
Employee stock options	112	8,418
RSUs and PSUs	91	3,659
Convertible notes	11,701	—
Total	11,904	12,077

13. RELATED PARTY

The Company sells products to SunPower, which as of March 31, 2019 held 7.5 million shares of the Company’s common stock, under the August 2018 MSA. Revenue recognized under the MSA for the three months ended March 31, 2019 was $4.5 million, net of amortization of the customer relationship intangible asset (see Note 4. “Goodwill and Intangible Assets”). At March 31, 2019 and December 31, 2018, the Company had accounts receivable of $5.2 million and $10.3 million, respectively, from SunPower.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 21

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 condensed 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 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 year ended December 31, 2018.

Overview and Q1 2019 Highlights

We are a global energy technology company. We deliver smart, easy-to-use solutions that connect solar generation, storage and management on one intelligent platform. We revolutionized solar with our microinverter technology and produces a fully-integrated solar plus storage solution. We have shipped more than 20 million microinverters, and more than 895,000 Enphase residential and commercial systems have been deployed in over 125 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.

On January 28, 2019, we repaid in full the remaining principal amount of the Term Loans of approximately $39.5 million plus accrued interest and fees owed to lenders affiliated with Tennenbaum Capital Partners, LLC.

Products

Enphase IQ Microinverter System

The Enphase IQ™ microinverter is a key component of the Enphase Home Energy Solution™, which can also include our Envoy™ Communications Gateway with IQ Combiner+, Enphase Enlighten™, a cloud-based energy management platform, 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.

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. In the first quarter of 2019, we shipped limited quantities of our new product IQ 7A™ which addresses up to 450W DC modules. In addition, we recently started shipping our IQ 7AS™ microinverters to SunPower Corporation (“SunPower”), which is expected to integrate our IQ 7AS into its 66-cell Next Generation Technology (“NGT”) DC modules.

Our IQ 8™ system is based upon our grid-agnostic “always on” technology called Ensemble. This system has four components: 1) energy generation, which is accomplished with the grid-agnostic microinverter IQ8; 2) energy storage, which is achieved by the Encharge™ battery with capacities of 3.3 kWh, 10 kWh and 13.2 kWh; 3) communication and control, which consists of the automatic transfer switch called Enpower™, and the combiner box with the Envoy gateway; and 4) Enlighten, which is the internet of things, or IoT, cloud software. We anticipate introducing Ensemble in a phased manner starting in the fourth quarter of 2019.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 22

Results of Operations

Net Revenues 

	Three Months Ended March 31,				Change in
	2019		2018		$		%
	(In thousands)
Net revenues	$	100,150	$	69,972	$	30,178	43	%

Three months ended March 31, 2019 and 2018

Net revenues increased by 43% for the three months ended March 31, 2019, as compared to the same period in 2018, primarily due to higher unit volume. We sold approximately 976,000 microinverter units in the three months ended March 31, 2019, as compared to approximately 611,000 units in the same period in 2018.

Cost of Revenues and Gross Profit 

	Three Months Ended March 31,						Change in
	2019			2018			$		%
	(In thousands)
Cost of revenues	$	66,811		$	51,657		$	15,154	29	%
Gross profit	33,339			18,315			15,024		82	%
Gross margin	33.3		%	26.2		%

Three months ended March 31, 2019 and 2018

Cost of revenues increased by 29% for the three months ended March 31, 2019, as compared to the same period in 2018, primarily due to higher volume of microinverter units sold and expedited freight costs, partially offset by a decrease in the cost of our products as a result of our cost reduction efforts. Gross margin increased by 7.1 percentage points for the three months ended March 31, 2019, as compared to the same period in 2018. 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 microinverters, as well as our overall pricing management efforts. In the first quarter of 2019, IQ 7 sales represent 94% of our total microinverter sales, as compared to 8% of our total microinverter sales in the first quarter of 2018.

Research and Development

	Three Months Ended March 31,				Change in
	2019		2018		$		%
	(In thousands)
Research and development	$	8,524	$	7,620	$	904	12	%

Three months ended March 31, 2019 and 2018

Research and development expense increased by 12% for the three months ended March 31, 2019, as compared to the same period in 2018. The increase is due to higher expenses associated with the development of our products, personnel-related costs, equipment costs, and facility costs. The increase in personnel-related expenses included higher bonus and stock-based compensation expense, partially offset by lower compensation and benefit costs associated with moving certain functions to lower cost locations as part of restructuring actions taken in 2018.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 23

Sales and Marketing

	Three Months Ended March 31,				Change in
	2019		2018		$		%
	(In thousands)
Sales and marketing	$	7,433	$	6,227	$	1,206	19	%

Three months ended March 31, 2019 and 2018

Sales and marketing expense increased by 19% for the three months ended March 31, 2019, as compared to the same period in 2018. The increase was due to an increase in personnel-related expenses and equipment costs, partially offset by lower bad debt expense and facilities costs. The increase in personnel-related expenses included higher stock-based compensation expense, sales bonus and commissions, and employee compensation.

General and Administrative

	Three Months Ended March 31,				Change in
	2019		2018		$		%
	(In thousands)
General and administrative	$	9,880	$	6,943	$	2,937	42	%

Three months ended March 31, 2019 and 2018

General and administrative expense increased 42% for the three months ended March 31, 2019, as compared to the same period in 2018. The increase is primarily due to an increase in personnel-related expenses and additional consulting and advisory fees due to our first year of being subject to SOX auditor attestation requirements, partially offset by lower facilities costs and $1.8 million paid to resolve a dispute with a supplier in 2018 that did not repeat in 2019. The increase in personnel-related expenses included higher stock-based compensation expense, employee compensation expense and benefit costs.

Restructuring Charges

	Three Months Ended March 31,				Change in
	2019		2018		$		%
	(In thousands)
Restructuring charges	$	368	$	—	$	368	**

** Not meaningful

Three months ended March 31, 2019 and 2018

Restructuring expense for the three months ended March 31, 2019 primarily include a $0.5 million of one-time termination benefits and other employee-related expenses, partially offset by $0.1 million reduction in lease loss reserves.

In the first quarter of 2018, we incurred no restructuring expense.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 24

Other Expense, Net

	Three Months Ended March 31,						Change in
	2019			2018			$			%
	(In thousands)
Other expense, net	$	(4,021	)	$	(2,418	)	$	(1,603	)	66%

Three months ended March 31, 2019 and 2018

Other expense, net for the three months ended March 31, 2019 includes $2.8 million of interest expense and financing fees related to our term loans which we repaid, $0.8 million of interest expense related to our convertible notes, and a $0.5 million charge related to foreign currency exchange and remeasurement. Other expense, net for the three months ended March 31, 2018 includes $2.3 million of interest expense related to our term loans and $0.4 million loss related to foreign currency exchange and remeasurement.

Liquidity and Capital Resources

Sources of Liquidity

As of March 31, 2019, we had $78.1 million in cash and cash equivalents and working capital of $66.7 million. Cash and cash equivalents held in the U.S. were $67.1 million and consisted primarily of U.S. Government money market mutual funds and non-interest-bearing checking deposits, with the remainder held in various foreign subsidiaries. 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.

Term Loans. On January 28, 2019, we repaid in full the remaining principal amount of the Term Loans of approximately $39.5 million plus accrued interest and fees owed to lenders affiliated with Tennenbaum Capital Partners, LLC.

Convertible Notes. In August 2018, we sold $65.0 million aggregate principal amount of convertible senior notes due 2023 (the “Notes”) in a private placement. The Notes are senior, unsecured and bear interest at a rate of 4.0% per year, payable semi-annually on February 1 and August 1 of each year, beginning on February 1, 2019. The Notes will mature on August 1, 2023, unless earlier repurchased by the Company or converted at the option of the holders.

We believe that our existing cash and cash equivalents 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,
	2019			2018
	(In thousands)
Net cash provided by operating activities	$	17,063		$	3,361
Net cash used in investing activities	(658		)	(1,043		)
Net cash provided by (used in) financing activities	(44,422		)	21,730

Cash Flows from Operating Activities

For the three months ended March 31, 2019, net cash provided by operating activities of $17.1 million was primarily attributable to net income of $2.8 million, non-cash charges of $8.4 million, cash from operating assets and liabilities of $3.8 million, and a one-time charge of $2.2 million related to settlement of our term loan. The primary driver of cash inflows from changes in operating assets and liabilities was a $4.9 million increase in accounts payable due to both successful re-negotiations of our vendor payment terms as well as the timing of vendor payments, a $3.3 million decrease in inventory due to higher demand and continued improvement in the management of our supply chain, and a $1.6 million increase in deferred revenues, which were partially offset by $3.3 million increase in accounts receivable due to higher sales.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 25

For the three months ended March 31, 2018, net cash provided by operating activities of $3.4 million was primarily attributable to a net loss of $5.1 million offset by non-cash charges of $5.0 million and net cash inflows from changes in operating assets and liabilities of $3.5 million. Non-cash charges included $1.6 million of stock-based compensation, $2.3 million of depreciation and amortization, and $0.6 million provision for doubtful accounts. The primary driver of cash outflows from changes in operating assets and liabilities was a $9.1 million decrease in accounts receivable due to seasonally lower revenues and a $7.5 million decrease in inventory due to supply chain management efforts, which were partially offset by an $12.0 million decrease in accounts payable as a result of lower inventory levels and the timing of vendor payments.

Cash Flows from Investing Activities

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.

For the three months ended March 31, 2018, net cash used in investing activities of $1.0 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, 2019, net cash used in financing activities of $44.4 million consisted of $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.

For the three months ended March 31, 2018, net cash provided by financing activities of $21.7 million consisted of $20.2 million in net proceeds from sales of common stock and $2.3 million in net proceeds from the sale of certain long-term financing receivables. These proceeds were partially offset by a $0.8 million principal payment on our term debt.

Contractual Obligations

Other than as described below, there were no material changes during the three months ended March 31, 2019 to our contractual commitments as presented in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” of our 2018 Form 10‑K filed with the SEC on March 15, 2019. See Note 9. “Commitments and Contingent Liabilities,” of the condensed consolidated financial statements.

On January 28, 2019, we repaid in full the remaining principal amount of the Term Loans of approximately $39.5 million plus accrued interest and fees owed to lenders affiliated with Tennenbaum Capital Partners, LLC.

Off-Balance Sheet Arrangements

As of March 31, 2019, 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 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.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 26

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.

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 2018 Form 10‑K filed with the SEC on March 15, 2019. Our exposures to market risk have not changed materially since December 31, 2018.

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, 2019. 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, 2019, 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.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 27

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

There has been no material changes in our risk factors from those disclosed in Part I, Item 1A, in our 2018 Form 10‑K filed with the SEC on March 15, 2019.

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

None.

Item 3. Defaults Upon Senior Securities

None.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other

None.

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 28

Item 6. Exhibits

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

			Incorporation by Reference
Exhibit Number	Exhibit Description	Form	SEC File No.	Exhibit	Filing Date	Filed Herewith
10.1	Bonus Program Summary.	8-K	001-35480	10.1	2/6/2019
10.2	Amendment No. 2 dated February 7, 2019 to Securities Purchase Agreement, by and among Enphase Energy, Inc. and the purchasers identified on Exhibit A thereto, dated January 9, 2017.					X
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

* 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. | Q1 2019 Form 10-Q | 29

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: April 30, 2019

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

Enphase Energy, Inc. | Q1 2019 Form 10-Q | 30

EX-10.2

DocuSign Envelope ID: 025ECDCA-DD38-46E2-A8F7-337BB4A493EA23A8CFD8-1ED4-494B-8571-6B0BAD99D1C6559B9FB4-34B5-42DF-8C7E-70FBCE342C19 AMENDMENT NO. 2 TO SECURITIES PURCHASE AGREEMENT This Amendment No. 2 dated February 7, 2019 (this “Amendment No. 2”) amends the Securities Purchase Agreement (the “Agreement”) dated January 9, 2017, as amended, between Enphase Energy, Inc., a Delaware corporation (the “Company”), and each purchaser identified on Exhibit A thereto (each a “Purchaser” and collectively, the “Purchasers”). IN CONSIDERATION of the mutual covenants and agreements contained in this Amendment No. 2, the sufficiency of which is hereby acknowledged, the parties agree as follows: 1. Defined Terms. Capitalized terms used but not defined in this Amendment No. 2 have the meanings ascribed to them in the Agreement. 2. Amendment to the Agreement. Section 6.5 of the Agreement is amended by deleting the second sentence and inserting the following sentence in its place: “In addition, the Board of Directors and Mr. Rodgers will agree on a solar industry expert to be added to the Board of Directors (the “New Director”), and the Board of Directors shall take all action necessary to appoint the New Director to the Board of Directors as a Class I director, within three years of the date of the Closing.” 3. No Other Amendments. Except as expressly set forth above, the Agreement remains in full force and effect. 4. Counterparts. This Amendment No. 2 may be executed in any number of separate counterparts, each of which shall be an original and all of which taken together shall constitute one instrument. ENPHASE ENERGY, INC. FORIS VENTURES, LLC By:_____________________________ By:____________________________ Badri Kothandaraman Barbara Hager Name: :_________________________ Name: :_________________________ President and CEO Title: :_________________________ Title: :_________________________Manager RODGERS MASSEY REVOCABLE LIVING TRUST dtd 4/4/11 By: ____________________________ Thurman John Rodgers (as Trustee)

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: April 30, 2019

/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: April 30, 2019

/s/ ERIC BRANDERIZ

Eric Branderiz

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, 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, 2019, 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 30th day of April, 2019.

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

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 23, 2019
Document and Entity Information [Abstract]
Entity Registrant Name	Enphase Energy, Inc.
Entity Central Index Key	0001463101
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Amendment Flag	false
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Current Fiscal Year End	--12-31
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		110,226,728

XML

CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 78,087	$ 106,237
Accounts receivable, net	81,715	78,938
Inventory	12,971	16,267
Prepaid expenses and other assets	22,669	20,860
Total current assets	195,442	222,302
Property and equipment, net	20,178	20,998
Operating lease, right of use asset	7,963
Intangible assets, net	34,124	35,306
Goodwill	24,783	24,783
Other assets	36,762	36,548
Total assets	319,252	339,937
Current liabilities:
Accounts payable	52,489	48,794
Accrued liabilities	32,431	29,010
Deferred revenues, current	32,916	33,119
Warranty obligations	7,925	8,083
Debt, current	2,985	28,155
Total current liabilities	128,746	147,161
Long-term liabilities:
Deferred revenues, noncurrent	78,393	76,911
Warranty obligations, noncurrent	23,117	23,211
Other liabilities	9,466	3,250
Debt, noncurrent	65,406	81,628
Total liabilities	305,128	332,161
Commitments and contingent liabilities (Note 9)
Stockholders’ equity:
Preferred stock, $0.00001 par value, 10,000 shares authorized; none issued and outstanding	0	0
Common stock, $0.00001 par value, 150,000 shares and 150,000 shares authorized; and 110,211 shares and 107,035 shares issued and outstanding at March 31, 2019 and December 31, 2018, respectively	1	1
Additional paid-in capital	357,023	353,335
Accumulated deficit	(343,563)	(346,302)
Accumulated other comprehensive income	663	742
Total stockholders’ equity	14,124	7,776
Total liabilities and stockholders’ equity	$ 319,252	$ 339,937

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Preferred stock, par value (in usd per share)	$ 0.00001	$ 0.00001
Preferred stock, shares authorized (in shares)	10,000,000	10,000,000
Preferred stock, shares issued (in shares)	0	0
Preferred stock, shares outstanding (in shares)	0	0
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)	110,211,000	107,035,000
Common stock, shares outstanding (in shares)	110,211,000	107,035,000

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Net revenues	$ 100,150	$ 69,972
Cost of revenues	66,811	51,657
Gross profit	33,339	18,315
Operating expenses:
Research and development	8,524	7,620
Sales and marketing	7,433	6,227
General and administrative	9,880	6,943
Restructuring charges	368	0
Total operating expenses	26,205	20,790
Income (loss) from operations	7,134	(2,475)
Other expense, net
Interest expense	(3,540)	(2,292)
Other expense	(481)	(126)
Total other expense, net	(4,021)	(2,418)
Income (loss) before income taxes	3,113	(4,893)
Provision for income taxes	(348)	(235)
Net income (loss)	$ 2,765	$ (5,128)
Net income (loss) per share:
Basic (in USD per share)	$ 0.03	$ (0.06)
Diluted (in USD per share)	$ 0.02	$ (0.06)
Shares used in per share calculation:
Basic (in shares)	108,195	91,422
Diluted (in shares)	115,863	91,422

XML

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 2,765	$ (5,128)
Other comprehensive (loss) income:
Foreign currency translation adjustments	(79)	288
Comprehensive income (loss)	$ 2,686	$ (4,840)

XML

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDER'S EQUITY (DEFICIT) - 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, 2017		$ 287,257	$ (295,727)	$ (656)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity incentive and stock purchase plans, net		269
Issuance of common stock, net		19,923
Stock-based compensation expense and other		1,571
Net income (loss)	$ (5,128)		(5,128)
Foreign currency translation adjustments	288			288
Balance, end of period at Mar. 31, 2018	(31,151)	309,020	(339,803)	(368)
Balance, beginning of period at Dec. 31, 2018	7,776	353,336	(346,302)	742
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued under equity incentive and stock purchase plans, net		309
Issuance of common stock, net		0
Stock-based compensation expense and other		3,353
Net income (loss)	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

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 2,765	$ (5,128)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	3,572	2,276
Provision for doubtful accounts	0	600
Amortization of debt issuance costs	1,490	537
Financing fees on extinguishment of debt	2,152	0
Stock-based compensation	3,290	1,571
Changes in operating assets and liabilities:
Accounts receivable	(3,266)	9,125
Inventory	3,296	7,457
Prepaid expenses and other assets	(2,413)	(1,039)
Accounts payable, accrued and other liabilities	4,851	(11,667)
Warranty obligations	(252)	809
Deferred revenues	1,578	(1,180)
Net cash provided by operating activities	17,063	3,361
Cash flows from investing activities:
Purchases of property and equipment	(658)	(1,043)
Net cash used in investing activities	(658)	(1,043)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs	0	19,923
Proceeds from debt, net of issuance costs	0	2,309
Principal payments and financing fees on debt	(44,731)	(771)
Proceeds from issuance of common stock under employee stock plans, net	309	269
Net cash provided by (used in) financing activities	(44,422)	21,730
Effect of exchange rate changes on cash	(133)	63
Cash and cash equivalents—Beginning of period	(28,150)	24,111
Cash and cash equivalents—Beginning of period	106,237	29,144
Cash and cash equivalents—End of period	78,087	53,255
Supplemental disclosures of non-cash investing and financing activities:
Purchases of fixed assets included in accounts payable	458	$ 117
Operating lease, right of use asset	$ 8,392

XML

DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION

3 Months Ended

Mar. 31, 2019

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 connect solar generation, storage and management on one intelligent platform. The Company revolutionized solar 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. The year-end condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the U.S. The Company filed audited consolidated financial statements, which included all information and notes necessary for such a complete presentation in conjunction with its 2018 Annual Report on Form 10-K.

Unaudited Interim Financial Information

These accompanying unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the Securities and Exchange Commission (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 (loss) and cash flows for the interim periods indicated. The results of operations for the three months ended March 31, 2019 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, inventory valuation and accrued warranty obligations. 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.Recently Adopted Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842).” ASU 2016-02 requires an entity to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. The guidance requires lessees to recognize all leases, with certain exceptions, on their balance sheets, whether operating or financing, while continuing to recognize the expenses on their income statements in a manner similar to current practice. The guidance states that a lessee must recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. On January 1, 2019, the Company adopted ASU 2016-02 using the modified retrospective transition option of applying the new standard at the adoption date for all leases with terms greater than 12 months. The Company elected certain practical expedients upon adoption and as such did not reassess the following: 1) whether any expired or existing contracts are or contain leases; 2) lease classification for any expired or existing leases; 3) initial direct costs for any expired or existing leases; 4) whether existing or expired land easements are or contain leases; and 5) regarding the lease term, from a hindsight perspective, whether or not the Company is reasonably certain to exercise the lease options. However, the Company will evaluate new or modified land easements under the new guidance after the commencement date. The Company also elected the practical expedient to not separate lease and non-lease components. The adoption of ASU 2016-02 on January 1, 2019 resulted in an increase in operating leases, right of use asset of $8.4 million, an increase in other liabilities of $6.8 million, an increase in accrued liabilities and other of $1.5 million and a decrease in other assets of $0.1 million on the Company’s consolidated balance sheets with no impact on the Company’s consolidated statements of operations.

In June 2018, the FASB issued ASU 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting.” ASU 2018-07 was issued to provide to provide guidance on share-based payments granted to non-employees in exchange for goods or services used or consumed in an entity’s own operations and supersedes the guidance in ASC 505-50, “Equity-Based Payments to Non-Employees.” ASU 2018-07 aligns much of the guidance on measuring and classifying non-employee awards with that of awards to employees. The Company adopted ASU 2018-07 on January 1, 2019 a modified retrospective basis. The adopted standard did not have a material impact on the consolidated financial statements.Recently Issued Accounting Pronouncements Not Yet Effective 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 is currently evaluating the impact this update will have on its consolidated financial statements.

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REVENUE RECOGNITION

3 Months Ended

Mar. 31, 2019

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. The following table provides information about disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line:

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Primary geographical markets:
United States	$	77,686	$	43,130
International	22,464		26,842
Total	$	100,150	$	69,972
Timing of revenue recognition:
Products delivered at a point in time	$	90,400	$	59,371
Products and services delivered over time	9,750		10,601
Total	$	100,150	$	69,972

Contract Balances

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

	March 31, 2019		December 31, 2018
	(In thousands)
Receivables	$	81,715	$	78,938
Short-term contract assets (Prepaid expenses and other assets)	13,595		13,516
Long-term contract assets (Other assets)	34,683		34,148
Short-term contract liabilities (Deferred revenues)	32,916		33,119
Long-term contract liabilities (Deferred revenues)	78,393		76,911

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, 2019. 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 assets (prepaid expenses and other assets) and contract liabilities (deferred revenues) during the period are as follows (in thousands):

Contract Assets
Balance on December 31, 2018	$	47,664
Amount recognized	(3,594		)
Increase	4,208
Balance as of March 31, 2019	$	48,278

Contract Liabilities
Balance on December 31, 2018	$	110,030
Revenue recognized	(9,750		)
Increase due to billings	11,029
Balance as of March 31, 2019	$	111,309

Remaining Performance Obligations

The following table includes 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.

	March 31, 2019
	(In thousands)
Fiscal year:
2019 (remaining nine months)	$	26,092
2020	27,797
2021	21,626
2022	16,594
2023	10,801
Thereafter	8,399
Total	$	111,309

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OTHER FINANCIAL INFORMATION

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Other Financial Information

OTHER FINANCIAL INFORMATIONAccounts Receivable, Net

Accounts receivable, net consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Accounts receivable	$	83,855		$	81,076
Allowance for doubtful accounts	(2,140		)	(2,138		)
Accounts receivable, net	$	81,715		$	78,938

Inventory

Inventory consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Raw materials	$	950	$	970
Finished goods	12,021		15,297
Total inventory	$	12,971	$	16,267

Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	6,442	$	4,107
Customer rebates and sales incentives	8,769		8,527
Freight	7,599		7,286
Other	9,621		9,090
Total accrued liabilities	$	32,431	$	29,010

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GOODWILL AND INTANGIBLE ASSETS

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

GOODWILL AND INTANGIBLE ASSETS

GOODWILL AND INTANGIBLE ASSETS

The following table presents the details of the Company’s goodwill and purchased intangible assets:

	March 31, 2019							December 31, 2018
	Gross		Accumulated Amortization			Net		Gross		Additions		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	3,664	$	21,119	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—	$	—		$	286
Intangible assets with finite lives:
Patents and licensed technology	1,665		(1,665		)	—		1,665		—		(1,665		)	—
Developed technology	13,100		(1,455		)	11,645		—		13,100		(909		)	12,191
Customer relationships	23,100		(907		)	22,193		—		23,100		(271		)	22,829
Total purchased intangible assets	$	38,151	$	(4,027	)	$	34,124	$	1,951	$	36,200	$	(2,845	)	$	35,306

In August 2018, the Company acquired certain finite-lived intangible assets in its acquisition of SunPower Corporation’s (“SunPower”) microinverter business pursuant to an Asset Purchase Agreement (“APA”), primarily developed technology and customer relationships. See Note 20. “Acquisition,” of the notes to consolidated financial statements included in Item 8 of the Company’s 2018 Form 10‑K filed with the SEC on March 15, 2019 for additional information related to this acquisition.

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

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	76
Customer relationships	636		—
Total amortization expense	$	1,182	$	76

Amortization of developed technology, patents and licensed technology is primarily recorded to sales and marketing expense. The developed technology acquired from the Company’s acquisition of SunPower’s microinverter business is embedded in the microinverters that SunPower sells 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 service agreement (“MSA”) negotiated 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 the 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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WARRANTY OBLIGATIONS

3 Months Ended

Mar. 31, 2019

Product Warranties Disclosures [Abstract]

WARRANTY OBLIGATIONS

WARRANTY OBLIGATIONS

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2019			2018
	(In thousands)
Warranty obligations, beginning of period	$	31,294		$	29,816
Accruals for warranties issued during period	858			758
Changes in estimates	804			1,450
Settlements	(2,296		)	(1,676		)
Increase due to accretion expense	551			419
Other	(169		)	(142		)
Warranty obligations, end of period	31,042			30,625
Less current portion	(7,925		)	(7,699		)
Noncurrent	$	23,117		$	22,926

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FAIR VALUE MEASUREMENTS

3 Months Ended

Mar. 31, 2019

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 liabilities that were measured at fair value on a recurring basis and its categorization within the fair value hierarchy:

	Fair Value Hierarchy	March 31, 2019		December 31, 2018
		(In thousands)
Warranty obligations
Current		$	4,237	$	4,288
Non-current		7,828		7,469
Total warranty obligations	Level 3	$	12,065	$	11,757

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,
	2019			2018
	(In thousands)
Balance at beginning of period	$	11,757		$	9,791
Accruals for warranties issued during period	858			758
Changes in estimates	341			1,785
Settlements	(1,272		)	(891		)
Increase due to accretion expense	551			419
Other	(170		)	(142		)
Balance at end of period	$	12,065		$	11,720

Quantitative and Qualitative Information about Level 3 Fair Value Measurements

As of March 31, 2019 and December 31, 2018, 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, 2019	December 31, 2018
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	14%	16%
		Credit-adjusted risk-free rate	18%	19%

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 $0.1 million increase to the liability. Decreasing the profit element and risk premium by 100 basis points would result in a $0.1 million reduction of the liability. Increasing the discount rate by 100 basis points would result in a $0.5 million reduction of the liability. Decreasing the discount rate by 100 basis points would result in a $0.5 million increase to the liability.

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RESTRUCTURING

3 Months Ended

Mar. 31, 2019

Restructuring and Related Activities [Abstract]

RESTRUCTURING

RESTRUCTURINGRestructuring expense consist of the following:

	Three Months Ended March 31,
	2019			2018
	(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 expects to complete this restructuring in 2019.

The following table provides information regarding changes in the Company’s 2018 Plan accrued restructuring balance for the periods indicated:

	Redundancy and Employee Severance and Benefits			Lease Loss Reserves and Contractual Obligations			Total
	(In thousands)
Balance as of December 31, 2018	$	904		$	288		$	1,192
Charges	468			—			468
Cash payments	(752		)	—			(752		)
Non-cash settlement and other	(55		)	(288		)	(343		)
Balance as of March 31, 2019	$	565		$	—		$	565

2016 Plan

In the third quarter of 2016, the Company began implementing restructuring actions (the “2016 Plan”) to lower its operating expenses. The restructuring actions have included reductions in the Company’s global workforce, the elimination of certain non-core projects, consolidation of office space at the Company’s corporate headquarters and the engagement of management consultants to assist the Company in making organizational and structural changes to improve operational efficiencies and reduce expenses. The Company substantially completed its restructuring activities under the 2016 Plan in 2017.

The following table provides information regarding changes in the Company’s 2016 Plan accrued restructuring balance for the periods indicated:

	Lease Loss Reserves and Contractual Obligations
	(In thousands)
Balance as of December 31, 2018	$	1,591
Other (1)	(1,591		)
Balance as of March 31, 2019	$	—

(1)

Adoption of ASU 2016-02.

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DEBT

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

DEBT

DEBT

Long-term debt was comprised of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Convertible notes due 2023	$	65,000		$	65,000
Less unamortized issuance costs	(2,232		)	(2,361		)
Carrying amount of convertible notes due 2023	62,768			62,639
Term loan	—			41,524
Less unamortized discount and issuance costs	—			(1,059		)
Carrying amount of term loan	—			40,465
Sale of long-term financing receivable recorded as debt	5,623			6,679
Less value of future purchase option	—			—
Carrying amount of sale of long-term financing receivable recorded as debt	5,623			6,679
Total carrying amount of debt	68,391			109,783
Less current portion term loan	—			(25,417		)
Less current portion of long-term financing receivable recorded as debt	(2,985		)	(2,738		)
Long-term debt	$	65,406		$	81,628

Term Loan

In July 2016, the Company entered into a Loan and Security Agreement (the “Original Term Loan Agreement”) with lenders that are affiliates of Tennenbaum Capital Partners, LLC. In February 2017, the Company entered into an Amended and Restated Loan and Security Agreement (the “Loan Agreement”) that amended and restated the Original Term Loan Agreement. The Loan Agreement provided for a $25.0 million secured term loan to the Company (the “New Term Loan”), which is in addition to the $25.0 million secured term loan borrowed by the Company under the Original Term Loan Agreement (together with the “New Term Loan” the “Term Loans”).

On January 28, 2019, the Company repaid in full the remaining principal amount of the Term Loans of approximately $39.5 million plus accrued interest and fees.

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COMMITMENTS AND CONTINGENCt LIABILITIES

3 Months Ended

Mar. 31, 2019

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 terms of the lease agreements generally provide for rental payments on a graduated basis, and certain leases require the Company to pay its portion of executory costs such as taxes, insurance, and operating expenses. The Company recognizes rent expense on a straight-line basis over the lease term.

The components of lease expense are presented as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Operating lease cost	$	499

The components of lease liabilities are presented as follows:

	March 31, 2019
	(In thousands)
Lease liabilities, current (Accrued liabilities)	$	2,181
Lease liabilities, non-current (Other liabilities)	7,837
Total lease liabilities	$	10,018

Supplemental lease information
Weighted average remaining lease term	4.4 years
Weighted average discount rate	9.2%

Other information related to operating leases, are as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities	$	737

Maturities of lease liabilities as of March 31, 2019 are as follows:

	Lease Amounts
	(In thousands)
Year:
2019 (remaining nine months)	$	2,248
2020	3,071
2021	3,155
2022	1,717
2023	893
Thereafter	1,227
Total	12,311
Less imputed lease interest	(2,293		)
Total lease liabilities	$	10,018

LitigationFrom 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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STOCK-BASED COMPENSATION

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

STOCK-BASED COMPENSATION

STOCK-BASED COMPENSATIONStock-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,
	2019		2018
	(In thousands)
Cost of revenues	$	231	$	198
Research and development	716		618
Sales and marketing	999		361
General and administrative	1,288		394
Restructuring	55		—
Total	$	3,289	$	1,571

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

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Stock options, RSUs, and PSUs	$	3,222	$	1,317
Employee stock purchase plan	67		254
Total	$	3,289	$	1,571

As of March 31, 2019, there was approximately $30.3 million of total unrecognized stock-based compensation expense related to unvested equity awards expected to be recognized over a weighted-average period of 2.1 years.

No income tax benefit has been recognized relating to stock-based compensation expense and no tax benefits have been realized from exercised stock options for the three months ended March 31, 2019.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 with the following assumptions:

• Expected term—The expected term of the option awards represents the period of time between the grant date of the option awards and the date the option awards are either exercised, converted or canceled, including an estimate for those option awards still outstanding. The Company used the simplified method, as permitted by the SEC for companies with a limited history of stock option exercise activity, to determine the expected term for its option grants.

• Expected volatility—The expected volatility was calculated based on the Company’s historical stock prices, supplemented as necessary with historical volatility of the common stock of several peer companies with characteristics similar to those of the Company.

• Risk-free interest rate—The risk-free interest rate was based on the U.S. Treasury yield curve in effect at the time of grant and with a maturity that approximated the Company’s expected term.

• Dividend yield—The dividend yield was based on the Company’s dividend history and the anticipated dividend payout over its expected term.

The following table presents the weighted-average grant date fair value of options granted for the periods presented and the assumptions used to estimate those values using a Black-Scholes option pricing model:

	Three Months Ended March 31,
	2019	2018
Weighted average grant date fair value	**	$	1.83
Expected term (in years)	**	4.2
Expected volatility	**	86.4		%
Annual risk-free rate of return	**	2.4		%
Dividend yield	**	—		%

** No stock options were granted during the period.

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, 2018	6,772		$	1.76
Granted	—		—
Exercised	(1,573	)	1.06			$	10,715
Canceled	(55	)	5.55
Outstanding at March 31, 2019	5,144		1.94		4.8	$	37,671
Vested and expected to vest at March 31, 2019	5,144		1.94		4.8	$	37,671
Exercisable at March 31, 2019	3,318		2.20		4.6	$	23,471

(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, 2019 is based on the closing price of the Company’s stock fair value on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.The following table summarizes information about stock options outstanding at March 31, 2019:

	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)
$0.27 —– $1.14	1,061	5.6	$	0.83	703	$	0.79
$1.29 —– $1.29	1,000	5.5	1.29		375	1.29
$1.31 —– $1.31	1,752	5.0	1.31		1,230	1.31
$1.37 —– $6.98	1,034	3.9	2.90		713	3.03
$7.01 —– $12.57	297	2.2	8.40		297	8.40
Total	5,144	4.8	1.94		3,318	2.20

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, 2018	4,352		$	3.52
Granted	1,114		8.12
Vested	(716	)	3.70			$	6,255
Canceled	(216	)	2.02
Outstanding at March 31, 2019	4,534		4.70		1.5	$	41,845
Expected to vest at March 31, 2019	4,532		4.70		1.5	$	41,835

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 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, 2018	1,330		$	4.66
Granted	1,046		9.40
Vested	(1,026	)	4.63			$	9,925
Canceled	(337	)	4.78
Outstanding at March 31, 2019	1,013		8.64		1.0	$	9,349
Expected to vest at March 31, 2019	1,013		8.64		1.0	$	9,349

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.

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INCOME TAXES	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
INCOME TAXES	INCOME TAXES The Company used the discrete tax approach in calculating the tax expense for the three months ended March 31, 2019 and 2018 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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NET INCOME (LOSS) PER SHARE

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

NET INCOME (LOSS) PER SHARE

NET INCOME (LOSS) PER SHARE

Basic net income (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) 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 employee stock purchase program (“ESPP”), and the convertible notes. The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income (loss) per share.

The following table presents the computation of basic and diluted net income (loss) per share for the periods presented:

	Three Months Ended March 31,
	2019		2018
	(In thousands, except per share data)
Numerator:
Net income (loss)	$	2,765	$	(5,128	)
Denominator:
Weighted average common shares outstanding	108,195		91,422
Effect of dilutive securities
Employee stock-based awards	7,668		—
Weighted average common shares outstanding for diluted calculation	115,863		91,422
Net income (loss) per share, basic	$	0.03	$	(0.06	)
Net income (loss) per share, diluted	$	0.02	$	(0.06	)

As the Company incurred a net loss for the three months ended March 31, 2018, potential dilutive securities from employee stock options, RSUs, PSUs, and shares to be purchased under the Company’s ESPP have been excluded from the diluted net loss per share computation because the effect of including such shares would have been antidilutive.

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

	Three Months Ended March 31,
	2019	2018
	(In thousands)
Employee stock options	112	8,418
RSUs and PSUs	91	3,659
Convertible notes	11,701	—
Total	11,904	12,077

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RELATED PARTY	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party	RELATED PARTYThe Company sells products to SunPower, which as of March 31, 2019 held 7.5 million shares of the Company’s common stock, under the August 2018 MSA. Revenue recognized under the MSA for the three months ended March 31, 2019 was $4.5 million, net of amortization of the customer relationship intangible asset (see Note 4. “Goodwill and Intangible Assets”). At March 31, 2019 and December 31, 2018, the Company had accounts receivable of $5.2 million and $10.3 million, respectively, from SunPower.

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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION (Policies)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Consolidation

Basis of Presentation and ConsolidationThe 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. The year-end condensed consolidated balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the U.S. The Company filed audited consolidated financial statements, which included all information and notes necessary for such a complete presentation in conjunction with its 2018 Annual Report on Form 10-K.

Use of Estimates

Use of EstimatesThe 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, inventory valuation and accrued warranty obligations. 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.

New Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-02, “Leases (Topic 842).” ASU 2016-02 requires an entity to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. The guidance requires lessees to recognize all leases, with certain exceptions, on their balance sheets, whether operating or financing, while continuing to recognize the expenses on their income statements in a manner similar to current practice. The guidance states that a lessee must recognize a lease liability for the obligation to make lease payments and a right-to-use asset for the right to use the underlying asset for the lease term. On January 1, 2019, the Company adopted ASU 2016-02 using the modified retrospective transition option of applying the new standard at the adoption date for all leases with terms greater than 12 months. The Company elected certain practical expedients upon adoption and as such did not reassess the following: 1) whether any expired or existing contracts are or contain leases; 2) lease classification for any expired or existing leases; 3) initial direct costs for any expired or existing leases; 4) whether existing or expired land easements are or contain leases; and 5) regarding the lease term, from a hindsight perspective, whether or not the Company is reasonably certain to exercise the lease options. However, the Company will evaluate new or modified land easements under the new guidance after the commencement date. The Company also elected the practical expedient to not separate lease and non-lease components. The adoption of ASU 2016-02 on January 1, 2019 resulted in an increase in operating leases, right of use asset of $8.4 million, an increase in other liabilities of $6.8 million, an increase in accrued liabilities and other of $1.5 million and a decrease in other assets of $0.1 million on the Company’s consolidated balance sheets with no impact on the Company’s consolidated statements of operations.

In June 2018, the FASB issued ASU 2018-07, “Compensation - Stock Compensation: Improvements to Non-employee Share-Based Payment Accounting.” ASU 2018-07 was issued to provide to provide guidance on share-based payments granted to non-employees in exchange for goods or services used or consumed in an entity’s own operations and supersedes the guidance in ASC 505-50, “Equity-Based Payments to Non-Employees.” ASU 2018-07 aligns much of the guidance on measuring and classifying non-employee awards with that of awards to employees. The Company adopted ASU 2018-07 on January 1, 2019 a modified retrospective basis. The adopted standard did not have a material impact on the consolidated financial statements.Recently Issued Accounting Pronouncements Not Yet Effective 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 is currently evaluating the impact this update will have on its 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 (loss) per share is computed by dividing net income (loss) by the weighted average number of shares of common stock outstanding during the period. Diluted net income (loss) 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 employee stock purchase program (“ESPP”), and the convertible notes. The dilutive effect of potentially dilutive common shares is reflected in diluted earnings per share by application of the treasury stock method. To the extent these potential common shares are antidilutive, they are excluded from the calculation of diluted net income (loss) per share.

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REVENUE RECOGNITION (Tables)

3 Months Ended

Mar. 31, 2019

Revenue from Contract with Customer [Abstract]

Summary of Revenue Disaggregation

The following table provides information about disaggregated revenue by primary geographical market and timing of revenue recognition for the Company’s single product line:

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Primary geographical markets:
United States	$	77,686	$	43,130
International	22,464		26,842
Total	$	100,150	$	69,972
Timing of revenue recognition:
Products delivered at a point in time	$	90,400	$	59,371
Products and services delivered over time	9,750		10,601
Total	$	100,150	$	69,972

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

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

Contract Assets
Balance on December 31, 2018	$	47,664
Amount recognized	(3,594		)
Increase	4,208
Balance as of March 31, 2019	$	48,278

Contract Liabilities
Balance on December 31, 2018	$	110,030
Revenue recognized	(9,750		)
Increase due to billings	11,029
Balance as of March 31, 2019	$	111,309

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

	March 31, 2019		December 31, 2018
	(In thousands)
Receivables	$	81,715	$	78,938
Short-term contract assets (Prepaid expenses and other assets)	13,595		13,516
Long-term contract assets (Other assets)	34,683		34,148
Short-term contract liabilities (Deferred revenues)	32,916		33,119
Long-term contract liabilities (Deferred revenues)	78,393		76,911

Summary of Estimated Revenue Expected to be Recognized in Future Periods

The following table includes 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.

	March 31, 2019
	(In thousands)
Fiscal year:
2019 (remaining nine months)	$	26,092
2020	27,797
2021	21,626
2022	16,594
2023	10,801
Thereafter	8,399
Total	$	111,309

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OTHER FINANCIAL INFORMATION (Tables)

3 Months Ended

Mar. 31, 2019

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Schedule of Accounts Receivable

Accounts receivable, net consist of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Accounts receivable	$	83,855		$	81,076
Allowance for doubtful accounts	(2,140		)	(2,138		)
Accounts receivable, net	$	81,715		$	78,938

Schedule of Inventory

Inventory consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Raw materials	$	950	$	970
Finished goods	12,021		15,297
Total inventory	$	12,971	$	16,267

Schedule of Accrued Liabilities

Accrued liabilities consist of the following:

	March 31, 2019		December 31, 2018
	(In thousands)
Salaries, commissions, incentive compensation and benefits	$	6,442	$	4,107
Customer rebates and sales incentives	8,769		8,527
Freight	7,599		7,286
Other	9,621		9,090
Total accrued liabilities	$	32,431	$	29,010

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GOODWILL AND INTANGIBLE ASSETS (Tables)

3 Months Ended

Mar. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Goodwill and Intangible Assets

The following table presents the details of the Company’s goodwill and purchased intangible assets:

	March 31, 2019							December 31, 2018
	Gross		Accumulated Amortization			Net		Gross		Additions		Accumulated Amortization			Net
	(In thousands)
Goodwill	$	24,783	$	—		$	24,783	$	3,664	$	21,119	$	—		$	24,783
Intangible assets:
Other indefinite-lived intangibles	$	286	$	—		$	286	$	286	$	—	$	—		$	286
Intangible assets with finite lives:
Patents and licensed technology	1,665		(1,665		)	—		1,665		—		(1,665		)	—
Developed technology	13,100		(1,455		)	11,645		—		13,100		(909		)	12,191
Customer relationships	23,100		(907		)	22,193		—		23,100		(271		)	22,829
Total purchased intangible assets	$	38,151	$	(4,027	)	$	34,124	$	1,951	$	36,200	$	(2,845	)	$	35,306

Schedule of Amortization Expense

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

	Three Months Ended March 31,
	2019		2018
	(In thousands)
Developed technology, and patents and licensed technology	$	546	$	76
Customer relationships	636		—
Total amortization expense	$	1,182	$	76

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WARRANTY OBLIGATIONS (Tables)

3 Months Ended

Mar. 31, 2019

Product Warranties Disclosures [Abstract]

Summary of Warranty Activities

The Company’s warranty activities were as follows:

	Three Months Ended March 31,
	2019			2018
	(In thousands)
Warranty obligations, beginning of period	$	31,294		$	29,816
Accruals for warranties issued during period	858			758
Changes in estimates	804			1,450
Settlements	(2,296		)	(1,676		)
Increase due to accretion expense	551			419
Other	(169		)	(142		)
Warranty obligations, end of period	31,042			30,625
Less current portion	(7,925		)	(7,699		)
Noncurrent	$	23,117		$	22,926

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FAIR VALUE MEASUREMENTS (Tables)

3 Months Ended

Mar. 31, 2019

Fair Value Disclosures [Abstract]

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

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

	Fair Value Hierarchy	March 31, 2019		December 31, 2018
		(In thousands)
Warranty obligations
Current		$	4,237	$	4,288
Non-current		7,828		7,469
Total warranty obligations	Level 3	$	12,065	$	11,757

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,
	2019			2018
	(In thousands)
Balance at beginning of period	$	11,757		$	9,791
Accruals for warranties issued during period	858			758
Changes in estimates	341			1,785
Settlements	(1,272		)	(891		)
Increase due to accretion expense	551			419
Other	(170		)	(142		)
Balance at end of period	$	12,065		$	11,720

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

As of March 31, 2019 and December 31, 2018, 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, 2019	December 31, 2018
Warranty obligations for microinverters sold since January 1, 2014	Discounted cash flows	Profit element and risk premium	14%	16%
		Credit-adjusted risk-free rate	18%	19%

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RESTRUCTURING (Tables)

3 Months Ended

Mar. 31, 2019

Restructuring and Related Activities [Abstract]

Restructuring and Related Costs

Restructuring expense consist of the following:

	Three Months Ended March 31,
	2019			2018
	(In thousands)
Redundancy and employee severance and benefit arrangements	$	468		$	—
Lease loss reserves	(100		)	—
Total restructuring charges	$	368		$	—

Schedule of Restructuring Reserve by Type of Cost

The following table provides information regarding changes in the Company’s 2018 Plan accrued restructuring balance for the periods indicated:

	Redundancy and Employee Severance and Benefits			Lease Loss Reserves and Contractual Obligations			Total
	(In thousands)
Balance as of December 31, 2018	$	904		$	288		$	1,192
Charges	468			—			468
Cash payments	(752		)	—			(752		)
Non-cash settlement and other	(55		)	(288		)	(343		)
Balance as of March 31, 2019	$	565		$	—		$	565

The following table provides information regarding changes in the Company’s 2016 Plan accrued restructuring balance for the periods indicated:

	Lease Loss Reserves and Contractual Obligations
	(In thousands)
Balance as of December 31, 2018	$	1,591
Other (1)	(1,591		)
Balance as of March 31, 2019	$	—

(1)

Adoption of ASU 2016-02.

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DEBT (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Debt

Long-term debt was comprised of the following:

	March 31, 2019			December 31, 2018
	(In thousands)
Convertible notes due 2023	$	65,000		$	65,000
Less unamortized issuance costs	(2,232		)	(2,361		)
Carrying amount of convertible notes due 2023	62,768			62,639
Term loan	—			41,524
Less unamortized discount and issuance costs	—			(1,059		)
Carrying amount of term loan	—			40,465
Sale of long-term financing receivable recorded as debt	5,623			6,679
Less value of future purchase option	—			—
Carrying amount of sale of long-term financing receivable recorded as debt	5,623			6,679
Total carrying amount of debt	68,391			109,783
Less current portion term loan	—			(25,417		)
Less current portion of long-term financing receivable recorded as debt	(2,985		)	(2,738		)
Long-term debt	$	65,406		$	81,628

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COMMITMENTS AND CONTINGENCt LIABILITIES (Tables)

3 Months Ended

Mar. 31, 2019

Commitments and Contingencies Disclosure [Abstract]

Components of Lease

The components of lease expense are presented as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Operating lease cost	$	499

The components of lease liabilities are presented as follows:

	March 31, 2019
	(In thousands)
Lease liabilities, current (Accrued liabilities)	$	2,181
Lease liabilities, non-current (Other liabilities)	7,837
Total lease liabilities	$	10,018

Supplemental lease information
Weighted average remaining lease term	4.4 years
Weighted average discount rate	9.2%

Other information related to operating leases, are as follows:

	Three Months Ended March 31, 2019
	(In thousands)
Cash paid for amounts included in the measurement of lease liabilities	$	737

Schedule of Future Minimum Rental Payments for Operating Leases

Maturities of lease liabilities as of March 31, 2019 are as follows:

	Lease Amounts
	(In thousands)
Year:
2019 (remaining nine months)	$	2,248
2020	3,071
2021	3,155
2022	1,717
2023	893
Thereafter	1,227
Total	12,311
Less imputed lease interest	(2,293		)
Total lease liabilities	$	10,018

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STOCK-BASED COMPENSATION (Tables)

3 Months Ended

Mar. 31, 2019

Disclosure of Compensation Related Costs, Share-based Payments [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,
	2019		2018
	(In thousands)
Cost of revenues	$	231	$	198
Research and development	716		618
Sales and marketing	999		361
General and administrative	1,288		394
Restructuring	55		—
Total	$	3,289	$	1,571

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,
	2019		2018
	(In thousands)
Stock options, RSUs, and PSUs	$	3,222	$	1,317
Employee stock purchase plan	67		254
Total	$	3,289	$	1,571

Summary of the Weighted-Average Grant Date Fair Value of Options Granted

The following table presents the weighted-average grant date fair value of options granted for the periods presented and the assumptions used to estimate those values using a Black-Scholes option pricing model:

	Three Months Ended March 31,
	2019	2018
Weighted average grant date fair value	**	$	1.83
Expected term (in years)	**	4.2
Expected volatility	**	86.4		%
Annual risk-free rate of return	**	2.4		%
Dividend yield	**	—		%

**

No stock options were granted during the period.

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, 2018	6,772		$	1.76
Granted	—		—
Exercised	(1,573	)	1.06			$	10,715
Canceled	(55	)	5.55
Outstanding at March 31, 2019	5,144		1.94		4.8	$	37,671
Vested and expected to vest at March 31, 2019	5,144		1.94		4.8	$	37,671
Exercisable at March 31, 2019	3,318		2.20		4.6	$	23,471

(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, 2019 is based on the closing price of the Company’s stock fair value on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.

Summary of Stock Option Outstanding

The following table summarizes information about stock options outstanding at March 31, 2019:

	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)
$0.27 —– $1.14	1,061	5.6	$	0.83	703	$	0.79
$1.29 —– $1.29	1,000	5.5	1.29		375	1.29
$1.31 —– $1.31	1,752	5.0	1.31		1,230	1.31
$1.37 —– $6.98	1,034	3.9	2.90		713	3.03
$7.01 —– $12.57	297	2.2	8.40		297	8.40
Total	5,144	4.8	1.94		3,318	2.20

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, 2018	4,352		$	3.52
Granted	1,114		8.12
Vested	(716	)	3.70			$	6,255
Canceled	(216	)	2.02
Outstanding at March 31, 2019	4,534		4.70		1.5	$	41,845
Expected to vest at March 31, 2019	4,532		4.70		1.5	$	41,835

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 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, 2018	1,330		$	4.66
Granted	1,046		9.40
Vested	(1,026	)	4.63			$	9,925
Canceled	(337	)	4.78
Outstanding at March 31, 2019	1,013		8.64		1.0	$	9,349
Expected to vest at March 31, 2019	1,013		8.64		1.0	$	9,349

(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, 2019 is based on the closing price of the Company’s stock on March 31, 2019 or the earlier of the last trading day prior to March 31, 2019, if March 31, 2019 is a non-trading day. The Company’s stock fair value used in this computation was $9.23 per share.

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NET INCOME (LOSS) PER SHARE (Tables)

3 Months Ended

Mar. 31, 2019

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 (loss) per share for the periods presented:

	Three Months Ended March 31,
	2019		2018
	(In thousands, except per share data)
Numerator:
Net income (loss)	$	2,765	$	(5,128	)
Denominator:
Weighted average common shares outstanding	108,195		91,422
Effect of dilutive securities
Employee stock-based awards	7,668		—
Weighted average common shares outstanding for diluted calculation	115,863		91,422
Net income (loss) per share, basic	$	0.03	$	(0.06	)
Net income (loss) per share, diluted	$	0.02	$	(0.06	)

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 (loss) per share attributable to common stockholders because their effect would have been antidilutive:

	Three Months Ended March 31,
	2019	2018
	(In thousands)
Employee stock options	112	8,418
RSUs and PSUs	91	3,659
Convertible notes	11,701	—
Total	11,904	12,077

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DESCRIPTION OF BUSINESS AND BASIS OF PRESENTATION - Impact of Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right of use asset	$ 7,963
Other liabilities	9,466		$ 3,250
Accrued liabilities	32,431		29,010
Other assets	$ 36,762		$ 36,548
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease, right of use asset		$ 8,400
Other liabilities		6,800
Accrued liabilities		1,500
Other assets		$ (100)

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REVENUE RECOGNITION - Narrative (Details)	3 Months Ended
	Mar. 31, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Contract asset impairment charges	$ 0

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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, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 100,150	$ 69,972
Products delivered at a point in time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	90,400	59,371
Products and services delivered over time
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	9,750	10,601
United States
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	77,686	43,130
International
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net revenues	$ 22,464	$ 26,842

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REVENUE RECOGNITION - Summary of Contract Assets and Contract Liabilities from Contracts with Customers (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenue from Contract with Customer [Abstract]
Receivables	$ 81,715	$ 78,938
Short-term contract assets (Prepaid expenses and other assets)	13,595	13,516
Long-term contract assets (Other assets)	34,683	34,148
Short-term contract liabilities (Deferred revenues)	32,916	33,119
Long-term contract liabilities (Deferred revenues)	$ 78,393	$ 76,911

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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, 2019 USD ($)
Contract Assets
Balance, beginning of period	$ 47,664
Amount recognized	(3,594)
Increase	4,208
Balance, end of period	48,278
Contract Liabilities
Balance, beginning of period	110,030
Revenue recognized	(9,750)
Increase due to billings	11,029
Balance, end of period	$ 111,309

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REVENUE RECOGNITION - Summary of Estimated Revenue Expected to be Recognized in Future Periods (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 111,309
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2019-04-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 26,092
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]: 2020-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 27,797
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]: 2021-01-01
Revenue from Contract with Customer [Abstract]
Total estimated revenue expected to be recognized in future periods	$ 21,626
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	$ 16,594
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	$ 10,801
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	$ 8,399
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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OTHER FINANCIAL INFORMATION - Accounts Receivable (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accounts receivable	$ 83,855	$ 81,076
Allowance for doubtful accounts	(2,140)	(2,138)
Accounts receivable, net	$ 81,715	$ 78,938

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OTHER FINANCIAL INFORMATION - Inventory (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Raw materials	$ 950	$ 970
Finished goods	12,021	15,297
Total inventory	$ 12,971	$ 16,267

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OTHER FINANCIAL INFORMATION - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Salaries, commissions, incentive compensation and benefits	$ 6,442	$ 4,107
Customer rebates and sales incentives	8,769	8,527
Freight	7,599	7,286
Other	9,621	9,090
Total accrued liabilities	$ 32,431	$ 29,010

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GOODWILL AND INTANGIBLE ASSETS - Schedule of Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Mar. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Goodwill, Gross	$ 3,664	$ 24,783
Goodwill, Additions	21,119
Goodwill, Net	24,783	24,783
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Other indefinite-lived intangibles, Gross	286	286
Other indefinite-lived intangibles, Additions	0
Intangible assets with finite lives:
Gross	1,951	38,151
Additions	36,200
Accumulated Amortization	(2,845)	(4,027)
Net	35,306	34,124
Patents and licensed technology
Intangible assets with finite lives:
Gross	1,665	1,665
Additions	0
Accumulated Amortization	(1,665)	(1,665)
Net	0	0
Developed technology
Intangible assets with finite lives:
Gross	0	13,100
Additions	13,100
Accumulated Amortization	(909)	(1,455)
Net	12,191	11,645
Customer relationship
Intangible assets with finite lives:
Gross	0	23,100
Additions	23,100
Accumulated Amortization	(271)	(907)
Net	$ 22,829	$ 22,193

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GOODWILL AND INTANGIBLE ASSETS - Amortization Expense (Details) - USD ($) $ in Thousands		3 Months Ended
	Aug. 09, 2018	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 1,182	$ 76
Developed Technology
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		546	76
Customer Relationships
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets		$ 636	$ 0
SunPower’s
Finite-Lived Intangible Assets [Line Items]
Agreement for exclusive supplier rights, period	5 years
SunPower’s | Developed 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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WARRANTY OBLIGATIONS - Summary of Warranty Activities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Changes in the Company's product warranty liability
Warranty obligations, beginning of period	$ 31,294	$ 29,816
Accruals for warranties issued during period	858	758
Changes in estimates	804	1,450
Settlements	(2,296)	(1,676)
Increase due to accretion expense	551	419
Other	(169)	(142)
Warranty obligations, end of period	31,042	30,625
Less current portion	(7,925)	(7,699)	$ (8,083)
Noncurrent	$ 23,117	$ 22,926	$ 23,211

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FAIR VALUE MEASUREMENTS - Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - Recurring - Total warranty obligations - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities, current	$ 4,237	$ 4,288
Fair value liabilities, non-current	7,828	7,469
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value liabilities	$ 12,065	$ 11,757	$ 11,720	$ 9,791

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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 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Balance at beginning of period	$ 11,757	$ 9,791
Accruals for warranties issued during period	858	758
Changes in estimates	341	1,785
Settlements	(1,272)	(891)
Increase due to accretion expense	551	419
Other	(170)	(142)
Balance at end of period	$ 12,065	$ 11,720

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FAIR VALUE MEASUREMENTS - Narrative (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Increase in liability as a result of decreasing the profit element and risk premium input by 100 basis points	$ 0.1
Decrease in liability as a result of increasing the profit element and risk premium input by 100 basis points	0.1
Increase to fair value measurement as a result of 100 basis point decrease	0.5
Decrease to fair value measurement as a result of 100 basis point increase	$ 0.5

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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, 2019	Dec. 31, 2018
Measurement Input, Profit Element and Risk Premium
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warranty obligations for microinverters sold since January 1, 2014	0.14	0.16
Measurement Input, Entity Credit Risk
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Warranty obligations for microinverters sold since January 1, 2014	0.18	0.19

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RESTRUCTURING - Summary of Restructuring Charges (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 368	$ 0
Redundancy and employee severance and benefit arrangements
Restructuring Cost and Reserve [Line Items]
Restructuring charges	468	0
Lease loss reserves
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment	$ (100)	$ 0

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RESTRUCTURING - Rollforward (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Restructuring Plan 2018
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning	$ 1,192
Charges	468
Cash payments	(752)
Non-cash settlement and other	(343)
Restructuring reserve, ending	565
Restructuring Plan 2018 | Employee Severance and Benefits
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning	904
Charges	468
Cash payments	(752)
Non-cash settlement and other	(55)
Restructuring reserve, ending	565
Restructuring Plan 2018 | Lease Loss Reserves and Contractual Obligations
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning	288
Charges	0
Cash payments	0
Non-cash settlement and other	(288)
Restructuring reserve, ending	0
Restructuring Plan 2016 | Lease Loss Reserves and Contractual Obligations
Restructuring Reserve [Roll Forward]
Restructuring reserve, beginning	1,591
Non-cash settlement and other	(1,591)
Restructuring reserve, ending	$ 0

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DEBT - Long term debt (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Total carrying amount of debt	$ 68,391	$ 109,783
Debt, current	(2,985)	(28,155)
Debt, noncurrent	65,406	81,628
Convertible Notes Payable | Convertible Senior Notes Due 2023
Debt Instrument [Line Items]
Carrying amount of long term debt	65,000	65,000
Less unamortized discount and issuance costs	(2,232)	(2,361)
Total carrying amount of debt	62,768	62,639
Secured Debt | Term Loan Agreement, July 2016
Debt Instrument [Line Items]
Carrying amount of long term debt	0	41,524
Less unamortized discount and issuance costs	0	(1,059)
Total carrying amount of debt	0	40,465
Debt, current	0	(25,417)
Financing Receivable | Financing Receivable Recorded as Debt
Debt Instrument [Line Items]
Carrying amount of long term debt	5,623	6,679
Less value of future purchase option	0	0
Total carrying amount of debt	5,623	6,679
Debt, current	$ (2,985)	$ (2,738)

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DEBT - Term Loan (Details) - USD ($)	Jan. 28, 2019	Feb. 28, 2017	Jul. 31, 2016
Debt Instrument [Line Items]
Repayments of Debt	$ 39,500,000
Tennenbaum Capital Partners, LLC | Secured Debt | Amended Tennenbaum Capital Partners LLC Agreement
Debt Instrument [Line Items]
Debt instrument face amount		$ 25,000,000.0	$ 25,000,000.0

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COMMITMENTS AND CONTINGENCt LIABILITIES - Narrative (Details)	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Term of lease contract, renewal term	12 years

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COMMITMENTS AND CONTINGENCt LIABILITIES - Lease Components (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Operating lease cost	$ 499
Lease liabilities, current (Accrued liabilities)	2,181
Lease liabilities, non-current (Other liabilities)	7,837
Total lease liabilities	$ 10,018
Weighted average remaining lease term	4 years 4 months 24 days
Weighted average discount rate	9.20%
Cash paid for amounts included in the measurement of lease liabilities	$ 737

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COMMITMENTS AND CONTINGENCt LIABILITIES - Schedule of Minimum Lease Payments Under Noncancelable Operating Leases (Details) $ in Thousands	Mar. 31, 2019 USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]
2019 (remaining nine months)	$ 2,248
2020	3,071
2021	3,155
2022	1,717
2023	893
Thereafter	1,227
Total operating lease minimum payments	12,311
Sublease income to be recognized in the future under noncancelable subleases	(2,293)
Total lease liabilities	$ 10,018

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STOCK-BASED COMPENSATION Summary of the Components of Total Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 3,289	$ 1,571
Total unrecognized compensation cost	$ 30,300
Weighted-average recognition period for unrecognized compensation cost	2 years 1 month 6 days
Cost of revenues
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 231	198
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	716	618
Sales and marketing
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	999	361
General and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	1,288	394
Restructuring
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 55	$ 0

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STOCK-BASED COMPENSATION Summary of Stock-Based Compensation Associated with Each Type of Award (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 3,289	$ 1,571
Stock options and RSUs and PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	3,222	1,317
Employee stock purchase plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock-based compensation expense	$ 67	$ 254

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STOCK-BASED COMPENSATION Summary of the Weighted-Average Grant Date Fair Value of Options Granted (Details) - Stock options	3 Months Ended
	Mar. 31, 2018 $ / shares
The fair value of each option granted during the periods
Weighted average grant date fair value (in usd per share)	$ 1.83
Expected term	4 years 2 months 12 days
Expected volatility	86.40%
Annual risk-free rate of return	2.40%
Dividend yield	0.00%

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STOCK-BASED COMPENSATION Summary of Stock Option Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) $ / shares shares
Number of Shares Outstanding
Outstanding, beginning balance (in shares) | shares	6,772
Granted (in shares) | shares	0
Exercised (in shares) | shares	(1,573)
Canceled (in shares) | shares	(55)
Outstanding, ending balance (in shares) | shares	5,144
Shares outstanding, vested and expected to vest (in shares) | shares	5,144
Shares outstanding, exercisable (in shares) | shares	3,318
Weighted- Average Exercise Price per Share
Outstanding, beginning balance (in usd per share)	$ 1.76
Granted (in usd per share)	0
Exercised (in usd per share)	1.06
Canceled (in usd per share)	5.55
Outstanding, ending balance (in usd per share)	1.94
Weighted-average exercise price, vested and expected (in usd per share)	1.94
Weighted-average exercise price, exercisable (in usd per share)	$ 2.20
Weighted-Average Remaining Contractual Term
Outstanding	4 years 10 months
Vested and expected to vest	4 years 10 months
Exercisable	4 years 7 months
Aggregate Intrinsic Value
Exercised | $	$ 10,715
Outstanding | $	37,671
Vested and expected to vest | $	37,671
Exercisable | $	$ 23,471
Share price (in USD per share)	$ 9.23

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STOCK-BASED COMPENSATION Summary of Stock Options Outstanding (Details) shares in Thousands	3 Months Ended
	Mar. 31, 2019 $ / shares shares
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	5,144
Options Outstanding - Weighted- Average Remaining Life	4 years 10 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 1.94
Options Exercisable - Number of Shares Exercisable (shares) | shares	3,318
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 2.20
$0.27 —– $1.14
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	1,061
Options Outstanding - Weighted- Average Remaining Life	5 years 7 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 0.83
Options Exercisable - Number of Shares Exercisable (shares) | shares	703
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 0.79
$1.29 —– $1.29
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	1,000
Options Outstanding - Weighted- Average Remaining Life	5 years 6 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 1.29
Options Exercisable - Number of Shares Exercisable (shares) | shares	375
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 1.29
$1.31 —– $1.31
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	1,752
Options Outstanding - Weighted- Average Remaining Life	5 years
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 1.31
Options Exercisable - Number of Shares Exercisable (shares) | shares	1,230
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 1.31
$1.37 —– $6.98
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	1,034
Options Outstanding - Weighted- Average Remaining Life	3 years 10 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 2.90
Options Exercisable - Number of Shares Exercisable (shares) | shares	713
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 3.03
$7.01 —– $12.57
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Options Outstanding - Number of Shares (shares) | shares	297
Options Outstanding - Weighted- Average Remaining Life	2 years 2 months
Options Outstanding - Weighted- Average Exercise Price (usd per share) | $ / shares	$ 8.40
Options Exercisable - Number of Shares Exercisable (shares) | shares	297
Options Exercisable - Weighted-average Exercise Price (usd per share) | $ / shares	$ 8.40

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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, 2019 USD ($) $ / shares shares
Weighted-Average Remaining Contractual Term
Outstanding	1 year 6 months
Aggregate Intrinsic Value
Share price (in USD per share)	$ 9.23
Restricted stock units
Number of Shares Outstanding
Outstanding, beginning balance (in shares) | shares	4,352
Granted (in shares) | shares	1,114
Vested (in shares) | shares	(716)
Canceled (in shares) | shares	(216)
Outstanding, ending balance (in shares) | shares	4,534
Number of shares outstanding, expected to vest (in shares) | shares	4,532
Weighted Average Fair Value per Share at Grant Date
Outstanding, beginning balance (in usd per share)	$ 3.52
Granted (in usd per share)	8.12
Vested (in usd per share)	3.70
Canceled (in usd per share)	2.02
Outstanding, ending balance (in usd per share)	4.70
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share)	$ 4.70
Weighted-Average Remaining Contractual Term
Expected to vest	1 year 6 months
Aggregate Intrinsic Value
Vested | $	$ 6,255
Outstanding | $	41,845
Expected to vest | $	$ 41,835

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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, 2019 USD ($) $ / shares shares
Weighted-Average Remaining Contractual Term
Outstanding	1 year 6 months
Aggregate Intrinsic Value
Share price (in USD per share)	$ 9.23
Performance Shares
Number of Shares Outstanding
Outstanding, beginning balance (in shares) | shares	1,330
Granted (in shares) | shares	1,046
Vested (in shares) | shares	(1,026)
Canceled (in shares) | shares	(337)
Outstanding, ending balance (in shares) | shares	1,013
Number of shares outstanding, expected to vest (in shares) | shares	1,013
Weighted Average Fair Value per Share at Grant Date
Outstanding, beginning balance (in usd per share)	$ 4.66
Granted (in usd per share)	9.40
Vested (in usd per share)	4.63
Canceled (in usd per share)	4.78
Outstanding, ending balance (in usd per share)	8.64
Weighted-Average Fair Value per Share at Grant Date, Expected to vest (in usd per share)	$ 8.64
Weighted-Average Remaining Contractual Term
Outstanding	1 year
Expected to vest	1 year
Aggregate Intrinsic Value
Vested | $	$ 9,925
Outstanding | $	9,349
Expected to vest | $	$ 9,349

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NET INCOME (LOSS) 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, 2019	Mar. 31, 2018
Numerator:
Net income (loss)	$ 2,765	$ (5,128)
Denominator:
Weighted average common shares outstanding (in shares)	108,195	91,422
Employee stock-based awards	7,668	0
Weighted average common shares outstanding for diluted calculation	115,863	91,422
Net loss per share, basic (in USD per share)	$ 0.03	$ (0.06)
Net income (loss) per share, diluted (in usd per share)	$ 0.02	$ (0.06)

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NET INCOME (LOSS) 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, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	11,904	12,077
Convertible Notes Payable
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	11,701	0
Employee stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	112	8,418
RSUs and PSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities (in shares)	91	3,659

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RELATED PARTY Narrative (Details) - SunPower’s - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Common stock held by related party (in shares)	7.5
Revenue from related parties	$ 4.5
Accounts receivable, related parties	$ 5.2	$ 10.3

XML

Label	Element	Value
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (26,000)
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(38,948,000)
Common Stock Including Additional Paid in Capital [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	0
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ 26,000

[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 and the adoption of Accounting Standards Codification (“ASC”) No. 606, “Revenue Recognition” on January 1, 2018.