Vivint Solar (VSLR) 10-Q 6 Nov 19 2019 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2019	Nov. 01, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Trading Symbol	VSLR
Entity Registrant Name	Vivint Solar, Inc.
Entity Central Index Key	0001607716
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Current Reporting Status	Yes
Entity Shell Company	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity File Number	001-36642
Entity Tax Identification Number	45-5605880
Entity Address, Address Line One	1800 West Ashton Blvd.
Entity Address, City or Town	Lehi
Entity Address, State or Province	UT
Entity Address, Postal Zip Code	84043
City Area Code	877
Local Phone Number	404-4129
Entity Common Stock, Shares Outstanding		122,087,876
Entity Incorporation, State or Country Code	DE
Title of 12(b) Security	Common Stock, par value $0.01 per share
Security Exchange Name	NYSE
Entity Interactive Data Current	Yes
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 260,753	$ 219,591
Accounts receivable, net		27,203	14,207
Inventories		13,727	13,257
Prepaid expenses and other current assets		31,895	31,201
Total current assets		333,578	278,256
Restricted cash and cash equivalents		83,743	71,305
Solar energy systems, net		1,696,129	1,938,874
Property and equipment, net		14,332	10,730
Other non-current assets, net		567,872	28,090
TOTAL ASSETS	[1]	2,695,654	2,327,255
Current liabilities:
Accounts payable		48,118	45,929
Distributions payable to non-controlling interests and redeemable non-controlling interests		17,328	7,846
Accrued compensation		40,647	25,520
Current portion of long-term debt		144,532	12,155
Current portion of deferred revenue		28,684	30,199
Current portion of finance lease obligation		1,529	1,921
Accrued and other current liabilities		70,238	42,860
Total current liabilities		351,076	166,430
Long-term debt, net of current portion		1,282,868	1,203,282
Deferred revenue, net of current portion		16,450	13,524
Finance lease obligation, net of current portion		4,308	505
Deferred tax liability, net		539,190	437,120
Other non-current liabilities		81,740	24,610
Total liabilities	[1]	2,275,632	1,845,471
Commitments and contingencies (Note 19)
Redeemable non-controlling interests		118,251	119,572
Stockholders’ equity:
Common stock, $0.01 par value—1,000,000 shares authorized, 122,088 shares issued and outstanding as of September 30, 2019; 1,000,000 shares authorized, 120,114 shares issued and outstanding as of December 31, 2018		1,221	1,201
Additional paid-in capital		586,517	574,248
Accumulated other comprehensive loss		(24,388)	(7,223)
Accumulated deficit		(348,430)	(279,631)
Total stockholders’ equity		214,920	288,595
Non-controlling interests		86,851	73,617
Total equity		301,771	362,212
TOTAL LIABILITIES, REDEEMABLE NON-CONTROLLING INTERESTS AND EQUITY		$ 2,695,654	$ 2,327,255
[1]	The assets of Vivint Solar, Inc. (the “Company”) as of September 30, 2019 and December 31, 2018 include $2,133.2 million and $1,835.8 million consisting of assets of variable interest entities, or VIEs, that can only be used to settle obligations of the VIEs. These assets include solar energy systems, net, of $1,541.3 million and $1,752.3 million as of September 30, 2019 and December 31, 2018; other non-current assets, net of $459.8 million and $10.9 million as of September 30, 2019 and December 31, 2018; cash and cash equivalents of $103.9 million and $62.4 million as of September 30, 2019 and December 31, 2018; accounts receivable, net, of $17.4 million and $6.6 million as of September 30, 2019 and December 31, 2018; restricted cash and cash equivalents of $8.4 million and $2.4 million as of September 30, 2019 and December 31, 2018; and prepaid expenses and other current assets of $2.4 million and $1.3 million as of September 30, 2019 and December 31, 2018. The Company’s liabilities as of September 30, 2019 and December 31, 2018 included $206.7 million and $80.8 million of liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include long-term debt of $169.3 million and $55.0 million as of September 30, 2019 and December 31, 2018; distributions payable to non-controlling interests and redeemable non-controlling interests of $17.3 million and $7.8 million as of September 30, 2019 and December 31, 2018; deferred revenue of $13.8 million and $12.0 million as of September 30, 2019 and December 31, 2018; accrued and other current liabilities of $6.0 million and $4.9 million as of September 30, 2019 and December 31, 2018; and other non-current liabilities of $0.4 million and $1.0 million as of September 30, 2019 and December 31, 2018. For further information see Note 14—Investment Funds.

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Common stock, par value		$ 0.01	$ 0.01
Common stock, shares authorized		1,000,000,000	1,000,000,000
Common stock, shares issued		122,088,000	120,114,000
Common stock, shares outstanding		122,088,000	120,114,000
Total assets	[1]	$ 2,695,654	$ 2,327,255
Solar energy systems, net		1,696,129	1,938,874
Cash and cash equivalents		260,753	219,591
Accounts receivable, net		27,203	14,207
Other non-current assets, net		567,872	28,090
Restricted cash and cash equivalents		83,743	71,305
Prepaid expenses and other current assets		31,895	31,201
Total liabilities	[1]	2,275,632	1,845,471
Distributions payable to non-controlling interests and redeemable non-controlling interests		17,328	7,846
Accrued and other current liabilities		70,238	42,860
Other non-current liabilities		81,740	24,610
Variable Interest Entities
Total assets		2,133,166	1,835,834
Solar energy systems, net		1,541,344	1,752,271
Cash and cash equivalents		103,921	62,350
Accounts receivable, net		17,385	6,593
Other non-current assets, net		459,771	10,888
Restricted cash and cash equivalents		8,361	2,443
Prepaid expenses and other current assets		2,384	1,289
Total liabilities		206,746	80,760
Long-term debt		169,300	55,000
Distributions payable to non-controlling interests and redeemable non-controlling interests		17,328	7,846
Deferred revenue		13,800	12,000
Accrued and other current liabilities		6,027	4,860
Other non-current liabilities		$ 375	$ 1,023
[1]	The assets of Vivint Solar, Inc. (the “Company”) as of September 30, 2019 and December 31, 2018 include $2,133.2 million and $1,835.8 million consisting of assets of variable interest entities, or VIEs, that can only be used to settle obligations of the VIEs. These assets include solar energy systems, net, of $1,541.3 million and $1,752.3 million as of September 30, 2019 and December 31, 2018; other non-current assets, net of $459.8 million and $10.9 million as of September 30, 2019 and December 31, 2018; cash and cash equivalents of $103.9 million and $62.4 million as of September 30, 2019 and December 31, 2018; accounts receivable, net, of $17.4 million and $6.6 million as of September 30, 2019 and December 31, 2018; restricted cash and cash equivalents of $8.4 million and $2.4 million as of September 30, 2019 and December 31, 2018; and prepaid expenses and other current assets of $2.4 million and $1.3 million as of September 30, 2019 and December 31, 2018. The Company’s liabilities as of September 30, 2019 and December 31, 2018 included $206.7 million and $80.8 million of liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include long-term debt of $169.3 million and $55.0 million as of September 30, 2019 and December 31, 2018; distributions payable to non-controlling interests and redeemable non-controlling interests of $17.3 million and $7.8 million as of September 30, 2019 and December 31, 2018; deferred revenue of $13.8 million and $12.0 million as of September 30, 2019 and December 31, 2018; accrued and other current liabilities of $6.0 million and $4.9 million as of September 30, 2019 and December 31, 2018; and other non-current liabilities of $0.4 million and $1.0 million as of September 30, 2019 and December 31, 2018. For further information see Note 14—Investment Funds.

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue:
Total revenue	$ 103,849	$ 77,816	$ 263,977	$ 226,864
Cost of revenue:
Total cost of revenue	68,437	59,835	184,756	184,923
Gross profit	35,412	17,981	79,221	41,941
Operating expenses:
Sales and marketing	46,121	15,841	112,792	40,999
Research and development	510	475	1,503	1,472
General and administrative	32,760	29,945	87,014	71,941
Total operating expenses	79,391	46,261	201,309	114,412
Loss from operations	(43,979)	(28,280)	(122,088)	(72,471)
Interest expense, net	22,804	18,715	61,403	46,973
Other expense (income), net	3,907	(1)	6,657	(6,371)
Loss before income taxes	(70,690)	(46,994)	(190,148)	(113,073)
Income tax expense	50,410	25,698	107,847	79,693
Net loss	(121,100)	(72,692)	(297,995)	(192,766)
Net loss attributable to non-controlling interests and redeemable non-controlling interests	(107,265)	(64,824)	(229,351)	(190,038)
Net loss attributable to common stockholders	$ (13,835)	$ (7,868)	$ (68,644)	$ (2,728)
Net loss attributable per share to common stockholders:
Basic and diluted	$ (0.11)	$ (0.07)	$ (0.57)	$ (0.02)
Weighted-average shares used in computing net loss attributable per share to common stockholders:
Basic and diluted	121,730	118,767	120,974	116,871
Customer Agreements and Incentives
Revenue:
Total revenue	$ 70,819	$ 53,470	$ 173,777	$ 139,349
Cost of revenue:
Total cost of revenue	48,993	42,135	132,258	122,188
Solar Energy System and Product Sales
Revenue:
Total revenue	33,030	24,346	90,200	87,515
Cost of revenue:
Total cost of revenue	$ 19,444	$ 17,700	$ 52,498	$ 62,735

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net loss attributable to common stockholders	$ (13,835)	$ (7,868)	$ (68,644)	$ (2,728)
Other comprehensive (loss) income:
Unrealized (losses) gains on cash flow hedging instruments (net of tax effect of $(2,110), $1,076, $(6,562) and $2,247)	(5,779)	2,890	(17,954)	6,037
Less: Interest (expense) income on derivatives recognized into earnings (net of tax effect of $(138), $(145), $(288) and $6,016)	(379)	(390)	(789)	16,165
Total other comprehensive (loss) income	(5,400)	3,280	(17,165)	(10,128)
Comprehensive loss	$ (19,235)	$ (4,588)	$ (85,809)	$ (12,856)

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive (Loss) Income (Unaudited) (Parenthetical) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Unrealized losses on cash flow hedging instruments, tax	$ (2,110)	$ 1,076	$ (6,562)	$ 2,247
Interest expense on derivatives recognized into earnings, tax	$ (138)	$ (145)	$ (288)	$ 6,016

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Redeemable Non-Controlling Interests and Equity - USD ($) shares in Thousands, $ in Thousands	Total	Redeemable Non-Controlling Interests	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive (Loss) Income	Retained Earnings (Accumulated Deficit)	Total Stockholders Equity	Non-Controlling Interests
Balance at Dec. 31, 2017	$ 861,066	$ 122,444	$ 1,151	$ 559,788	$ 6,905	$ 213,107	$ 780,951	$ 80,115
Balance (in Shares) at Dec. 31, 2017			115,099
Cumulative-effect adjustment from adoption of new ASUs	(473,828)				3,318	(477,146)	(473,828)
Stock-based compensation expense	9,884			9,884			9,884
Issuance of common stock, net	876		$ 42	834			876
Issuance of common stock, net (in shares)			4,217
Contributions from non-controlling interests and redeemable non-controlling interests	122,843	72,078						122,843
Distributions to non-controlling interests and redeemable non-controlling interests	(28,865)	(7,663)						(28,865)
Total other comprehensive income (loss)	(10,128)				(10,128)		(10,128)
Net loss	(127,727)	(65,039)				(2,728)	(2,728)	(124,999)
Balance at Sep. 30, 2018	354,121	121,820	$ 1,193	570,506	95	(266,767)	305,027	49,094
Balance (in Shares) at Sep. 30, 2018			119,316
Balance at Jun. 30, 2018	347,223	122,647	$ 1,185	567,372	(3,185)	(258,899)	306,473	40,750
Balance (in Shares) at Jun. 30, 2018			118,477
Stock-based compensation expense	3,103			3,103			3,103
Issuance of common stock, net	39		$ 8	31			39
Issuance of common stock, net (in shares)			839
Contributions from non-controlling interests and redeemable non-controlling interests	79,555	7,079						79,555
Distributions to non-controlling interests and redeemable non-controlling interests	(11,742)	(2,551)						(11,742)
Total other comprehensive income (loss)	3,280				3,280		3,280
Net loss	(67,337)	(5,355)				(7,868)	(7,868)	(59,469)
Balance at Sep. 30, 2018	354,121	121,820	$ 1,193	570,506	95	(266,767)	305,027	49,094
Balance (in Shares) at Sep. 30, 2018			119,316
Balance at Dec. 31, 2018	$ 362,212	119,572	$ 1,201	574,248	(7,223)	(279,631)	288,595	73,617
Balance (in Shares) at Dec. 31, 2018	120,114		120,114
Cumulative-effect adjustment from adoption of new ASUs	$ (155)					(155)	(155)
Stock-based compensation expense	11,985			11,985			11,985
Issuance of common stock, net	304		$ 20	284			304
Issuance of common stock, net (in shares)			1,974
Contributions from non-controlling interests and redeemable non-controlling interests	263,081	20,974						263,081
Distributions to non-controlling interests and redeemable non-controlling interests	(35,167)	(7,624)						(35,167)
Total other comprehensive income (loss)	(17,165)				(17,165)		(17,165)
Net loss	(283,324)	(14,671)				(68,644)	(68,644)	(214,680)
Balance at Sep. 30, 2019	$ 301,771	118,251	$ 1,221	586,517	(24,388)	(348,430)	214,920	86,851
Balance (in Shares) at Sep. 30, 2019	122,088		122,088
Balance at Jun. 30, 2019	$ 320,386	118,900	$ 1,216	582,338	(18,988)	(334,595)	229,971	90,415
Balance (in Shares) at Jun. 30, 2019			121,606
Stock-based compensation expense	4,150			4,150			4,150
Issuance of common stock, net	34		$ 5	29			34
Issuance of common stock, net (in shares)			482
Contributions from non-controlling interests and redeemable non-controlling interests	121,449	2,968						121,449
Distributions to non-controlling interests and redeemable non-controlling interests	(18,608)	(2,757)						(18,608)
Total other comprehensive income (loss)	(5,400)				(5,400)		(5,400)
Net loss	(120,240)	(860)				(13,835)	(13,835)	(106,405)
Balance at Sep. 30, 2019	$ 301,771	$ 118,251	$ 1,221	$ 586,517	$ (24,388)	$ (348,430)	$ 214,920	$ 86,851
Balance (in Shares) at Sep. 30, 2019	122,088		122,088

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (297,995)	$ (192,766)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	61,243	51,247
Deferred income taxes	108,344	80,121
Stock-based compensation	11,985	9,884
Loss on solar energy systems and property and equipment	9,254	4,439
Noncash interest and other expense	7,288	15,317
Reduction in lease pass-through financing obligation	(3,662)	(3,549)
Losses (gains) on interest rate swaps	846	(1,279)
Changes in operating assets and liabilities:
Accounts receivable, net	(12,996)	(245)
Inventories	(470)	6,817
Prepaid expenses and other current assets	741	8,931
Other non-current assets, net	(126,402)	(8,042)
Accounts payable	2,032	941
Accrued compensation	14,409	4,390
Deferred revenue	1,411	(6,441)
Accrued and other liabilities	9,050	7,177
Net cash used in operating activities	(214,922)	(23,058)
CASH FLOWS FROM INVESTING ACTIVITIES:
Payments for the cost of solar energy systems	(187,328)	(233,548)
Payments for property and equipment	(1,219)	(129)
Proceeds from disposals of solar energy systems and property and equipment	2,025	2,335
Purchase of intangible assets	(1,089)	(223)
Net cash used in investing activities	(187,611)	(231,565)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from investment by non-controlling interests and redeemable non-controlling interests	284,055	194,921
Distributions paid to non-controlling interests and redeemable non-controlling interests	(33,309)	(41,729)
Proceeds from long-term debt	351,972	917,748
Payments on long-term debt	(139,080)	(693,782)
Payments for debt issuance and deferred offering costs	(9,382)	(21,209)
Proceeds from lease pass-through financing obligation	2,527	2,491
Principal payments on finance lease obligations	(954)	(2,663)
Proceeds from issuance of common stock	304	876
Net cash provided by financing activities	456,133	356,653
NET INCREASE IN CASH AND CASH EQUIVALENTS, INCLUDING RESTRICTED AMOUNTS	53,600	102,030
CASH AND CASH EQUIVALENTS, INCLUDING RESTRICTED AMOUNTS—Beginning of period	290,896	154,938
CASH AND CASH EQUIVALENTS, INCLUDING RESTRICTED AMOUNTS—End of period	344,496	256,968
NONCASH INVESTING AND FINANCING ACTIVITIES:
Costs of solar energy systems included in changes in accounts payable, accrued compensation and accrued and other liabilities	55,183	4,682
Right-of-use assets obtained in exchange for new operating lease liabilities	9,210
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 6,077	1,079
Solar energy system sales
NONCASH INVESTING AND FINANCING ACTIVITIES:
Receivable for state tax credits recorded as a reduction to solar energy system costs		$ 7

Organization

Organization	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Organization	1 . Organization Vivint Solar, Inc. and its subsidiaries are collectively referred to as the “Company.” The Company most commonly offers solar energy to residential customers through long-term customer contracts, such as power purchase agreements (“PPAs”) and legal-form leases (“Solar Leases”). The Company also offers its customers the option to purchase solar energy systems (“System Sales”) through third-party loan offerings or a cash purchase. The Company enters into customer contracts through a sales organization that primarily uses a direct-to-home sales model. The long-term customer contracts under PPAs and Solar Leases are typically for 20 years and require the customer to make monthly payments to the Company. The Company has formed various investment funds and entered into long-term debt facilities to monetize the recurring customer payments under its long-term customer contracts and investment tax credits (“ITCs”), accelerated tax depreciation and other incentives associated with residential solar energy systems. The Company uses the cash received from the investment funds, long-term debt facilities and cash generated from operations, including System Sales, to finance a portion of the Company’s variable and fixed costs associated with installing solar energy systems.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	2 . Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The unaudited condensed consolidated financial statements were prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments (all of which were considered of normal recurring nature) considered necessary to present fairly the Company’s financial results. The results of the nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2019 or for any other interim period or other future year. The unaudited condensed consolidated financial statements reflect the accounts and operations of the Company and those of its subsidiaries in which the Company has a controlling financial interest. The Company uses a qualitative approach in assessing the consolidation requirement for VIEs. This approach focuses on determining whether the Company has the power to direct the activities of the VIE that most significantly affect the VIE’s economic performance and whether the Company has the obligation to absorb losses, or the right to receive benefits, that could potentially be significant to the VIE. All of these determinations involve significant management judgments and estimates. The Company has determined that it is the primary beneficiary in the operational VIEs in which it has an equity interest. The Company evaluates its relationships with the VIEs on an ongoing basis to ensure that it continues to be the primary beneficiary. All intercompany transactions and balances have been eliminated in consolidation. For additional information, see Note 14—Investment Funds. Beginning with the first quarter of 2019, the condensed consolidated statements of operations items formerly captioned “Operating leases and incentives” and “Cost of revenue—operating leases and incentives” are now captioned “Customer agreements and incentives” and “Cost of revenue—customer agreements and incentives.” Also beginning with the first quarter of 2019, the condensed consolidated balance sheet items formerly captioned “Current portion of capital lease obligation” and “Capital lease obligation, net of current portion” are now captioned “Current portion of finance lease obligation” and “Finance lease obligation, net of current portion.” Amounts in these balance sheet items were capital leases under Accounting Standards Codification 840: Leases (“Topic 840”) in periods ending prior to January 1, 2019, while amounts in these balance sheet items are finance leases under Accounting Standards Codification 842: Leases (“Topic 842”) in periods ending subsequent to January 1, 2019. See “—Leases” below for further explanation of these changes. Use of Estimates The preparation of the condensed consolidated financial statements requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The Company regularly makes significant estimates and assumptions including, but not limited to, ITCs; revenue recognition; solar energy systems, net; the impairment analysis of long-lived assets; stock-based compensation; the provision for income taxes; the valuation of derivative financial instruments; the recognition and measurement of loss contingencies; and non-controlling interests and redeemable non-controlling interests. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ materially from those estimates. Liquidity In order to grow, the Company requires cash to finance the deployment of solar energy systems. As of the date of this filing, the Company will require additional sources of cash beyond current cash balances and currently available financing facilities to fund long-term planned growth. If the Company is unable to secure additional financing when needed, or upon desirable terms, the Company may be unable to finance installation of customers’ systems in a manner consistent with past performance, cost of capital could increase, or the Company may be required to significantly reduce the scope of operations, any of which would have a material adverse effect on its business, financial condition, results of operations and prospects. While the Company believes additional financing is available and will continue to be available to support current levels of operations, the Company believes it has the ability and intent to reduce operations to the level of available financial resources for at least the next 12 months from the date of this report, if necessary. Performance Obligation—Solar Energy system and Product Sales For certain System Sales, the Company provides limited post-sale services to monitor the productivity of the solar energy system for 20 years after it has been placed into service. The Company allocates a portion of the transaction price to the monitoring services by estimating the standalone selling price that the Company would charge for these services if offered separately from the sale of the solar energy system. As of September 30, 2019 and December 31, 2018, the Company had allocated deferred revenue of $4.4 million and $3.3 million to monitoring services that will be recognized over the term of the monitoring services. Leases The Company adopted Topic 842 and its subsequent updates effective January 1, 2019. These updates are intended to increase transparency and comparability among organizations by recognizing right-of-use assets and lease liabilities on the condensed consolidated balance sheets and disclosing key information about leasing arrangements. The Company utilized the additional transition method permitted by Accounting Standards Update (“ASU”) 2018-11 and adopted Topic 842 using a modified retrospective method with a cumulative-effect adjustment to its accumulated deficit as of January 1, 2019. As such, comparative periods ending prior to January 1, 2019 are presented in accordance with Topic 840 and periods ending after January 1, 2019 are presented in accordance with Topic 842. The impact to the accumulated deficit as a result of adopting ASU 2016-02 was a net reduction of approximately $0.2 million. The Company did not use the transitionary practical expedients allowed under Topic 842, and as such, the Company reassessed all contracts existing at the adoption date of January 1, 2019. The Company elected to treat leases with lease terms of 12 months or less as short-term leases. No right-of-use assets or lease liabilities are recognized for short-term leases. The Company has also elected not to separate lease components from non-lease components for all classes of leased assets except for building leases. The adoption of this ASU resulted in right-of-use assets of $34.6 million related to operating leases being recognized in other non-current assets, net on the condensed consolidated balance sheets as of January 1, 2019. Corresponding lease liabilities of $43.8 million related to operating leases were recognized on the condensed consolidated balance sheets as of January 1, 2019, with the current portion recognized in accrued and other current liabilities and the long-term portion recognized in other non-current liabilities. In addition, at January 1, 2019, approximately $1.0 million of lease-related liabilities were removed from accrued and other current liabilities and approximately $8.2 million of lease-related liabilities were removed from other non-current liabilities and included as reductions to the initial operating lease right-of-use assets. As of January 1, 2019, finance lease right-of-use assets of $0.9 million continued to be recorded in property and equipment, net. Any changes in lease terms or estimates subsequent to adoption of the ASU 2016-02 are reflected in the right-of-use assets and lease liabilities. The Company’s PPAs, Solar Leases, and associated rebates and incentives no longer meet the definition of a lease under Topic 842. Accordingly, they are accounted for in accordance with Accounting Standards Codification 606: Revenue from Contracts with Customers (“Topic 606”) beginning on January 1, 2019. The Company concluded that there was no change to its revenue recognition practices for its PPA revenue stream under Topic 606. For Solar Leases, the Company concluded that the impact of applying Topic 606 is immaterial. The Company also concluded that there was no material change related to the timing of revenue recognition for rebates and incentives under Topic 606. Upon the adoption of Topic 842, the Company no longer capitalizes initial direct costs and amortizes them to the respective cost of revenue line items. Instead, the Company now capitalizes costs of obtaining a contract which meet the “incremental” criteria defined in Accounting Standards Codification 340 to other non-current assets, net. These costs are now amortized over the period of benefit to sales and marketing expense on the condensed consolidated statements of operations. In accordance with the Company’s Topic 842 transition discussed above, no prior period amounts were changed. For purposes of comparison, the following tables show how the balances as of December 31, 2018 and for the three and nine months ended September 30, 2018 would have changed if the effects of adopting Topic 842 had been applied to those balances (in thousands): December 31, 2018 September 30, 2019 As Reported Adjustments As Adjusted As Reported Solar energy systems, net $ 1,938,874 $ (388,087 ) $ 1,550,787 $ 1,696,129 Other non-current assets, net 28,090 388,087 416,177 567,872 Three Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 42,135 $ (4,625 ) $ 37,510 $ 48,993 Cost of revenue—solar energy system and product sales 17,700 (3,804 ) 13,896 19,444 Total cost of revenue 59,835 (8,429 ) 51,406 68,437 Gross profit 17,981 8,429 26,410 35,412 Sales and marketing 15,841 8,429 24,270 46,121 Total operating expenses 46,261 8,429 54,690 79,391 Nine Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 122,188 $ (13,215 ) $ 108,973 $ 132,258 Cost of revenue—solar energy system and product sales 62,735 (14,058 ) 48,677 52,498 Total cost of revenue 184,923 (27,273 ) 157,650 184,756 Gross profit 41,941 27,273 69,214 79,221 Sales and marketing 40,999 27,273 68,272 112,792 Total operating expenses 114,412 27,273 141,685 201,309 Software Implementation Costs The Company adopted ASU 2018-15 , Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract, effective January 1, 2019. This update clarifies that entities should capitalize implementation costs incurred in cloud computing arrangements that are service contracts, which the Company will now record within other non-current assets, net. The Company will expense the capitalized costs over the term of the hosting arrangement. The service element of a hosting arrangement that is a service contract is not affected by this update, meaning service costs will continue to be expensed as incurred. The Company is applying the amendments in this update on a prospective basis beginning January 1, 2019. No prior periods were impacted as a result of adopting this ASU. Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. the Company’s accounts receivable and certain contract assets are considered financial assets measured at an amortized cost basis and will need to be presented at the net amount expected to be collected. This ASU will be effective for the Company beginning on January 1, 2020 and will be applied through a modified retrospective approach with a cumulative-effect adjustment to retained earnings as of the first reporting period in which the guidance is effective. The Company is still evaluating the impact of this update on its condensed consolidated financial statements and related disclosures but currently anticipates that the impact will not be significant.

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Fair Value Measurements	3 . Fair Value Measurements The Company measures and reports its cash equivalents at fair value. The following tables set forth the fair value of the Company’s financial assets and liabilities included on the condensed consolidated balance sheets measured on a recurring basis by level within the fair value hierarchy (in thousands): September 30, 2019 Level 1 Level 2 Level 3 Total Financial Liabilities Interest rate swaps $ — $ 35,301 $ — $ 35,301 December 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets Interest rate swaps $ — $ 130 $ — $ 130 Financial Liabilities Interest rate swaps $ — $ 11,146 $ — $ 11,146 The interest rate swaps (Level 2) were valued using a discounted cash flow model that incorporates an assessment of the risk of non-performance by the interest rate swap counterparties and the Company. The valuation model uses various observable inputs including contractual terms, interest rate curves, credit spreads and measures of volatility. Financial liabilities as of September 30, 2019 include interest rate swaps for the Warehouse Facility, which are not designated as hedges, and interest rate swaps for the Solar Asset Backed Notes, Series 2018-2, which are designated as hedges. Financial liabilities as of December 31, 2018 included interest rate swaps for the Aggregation Facility, which were not designated as hedges, and interest rate swaps for the Solar Asset Backed Notes, Series 2018-2, which are designated as hedges. Financial assets as of December 31, 2018 primarily related to interest rate swaps for the Aggregation Facility, which were not designated as hedges. See Note 11—Debt Obligations for additional details about these debt instruments. The carrying values and fair values of the Company’s long-term debt were as follows (in thousands): September 30, 2019 December 31, 2018 Carrying Value Fair Value Carrying Value Fair Value Floating-rate long-term debt $ 814,795 $ 814,795 $ 587,358 $ 587,358 Fixed-rate long-term debt 638,486 705,100 653,031 673,917 Total $ 1,453,281 $ 1,519,895 $ 1,240,389 $ 1,261,275 The Company’s outstanding principal balance of long-term debt is carried at cost. The Company estimated the fair values of its floating-rate debt facilities (Level 2) to approximate their carrying values as interest accrues at floating rates based on market rates. The Company’s fixed-rate debt facilities (Level 2) were valued using quoted prices for the fixed rate debt facilities that are publicly traded, or quoted prices for corporate debt with similar terms for debt facilities that are not publicly traded.

Inventories

Inventories	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Inventories	4 . Inventories Inventories consisted of the following (in thousands): September 30, December 31, 2019 2018 Solar energy systems held for sale $ 12,925 $ 12,321 Photovoltaic installation products 802 936 Total inventories $ 13,727 $ 13,257 Solar energy systems held for sale are solar energy systems under construction that have yet to be interconnected to the power grid and that will be sold to customers. Solar energy systems held for sale are stated at the lower of cost, on a first-in, first-out basis, or net realizable value. Photovoltaic installation products are stated at the lower of cost, on an average cost basis, or net realizable value.

Solar Energy Systems

Solar Energy Systems	9 Months Ended
	Sep. 30, 2019
Solar Energy Systems Disclosure [Abstract]
Solar Energy Systems	5 . Solar Energy Systems Solar energy systems, net consisted of the following (in thousands): September 30, December 31, 2019 2018 System equipment costs $ 1,856,664 $ 1,667,440 Initial direct costs related to solar energy systems — 435,084 1,856,664 2,102,524 Less: Accumulated depreciation (190,224 ) (195,890 ) 1,666,440 1,906,634 Solar energy system inventory 29,689 32,240 Solar energy systems, net $ 1,696,129 $ 1,938,874 Solar energy system inventory represents the solar components and materials used in the installation of solar energy systems prior to being installed on customers’ roofs. As such, no depreciation is recorded related to this line item. The Company recorded depreciation expense related to solar energy systems of $14.4 million and $17.0 million for the three months ended September 30, 2019 and 2018. The Company recorded depreciation expense related to solar energy systems of $41.3 million and $48.5 million for the nine months ended September 30, 2019 and 2018. The Company did not record any initial direct costs or amortization of initial direct costs related to solar energy systems in 2019 due to the adoption of Topic 842. See Note 2—Summary of Significant Accounting Policies.

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Property and Equipment	6 . Property and Equipment Property and equipment, net consisted of the following (in thousands): Estimated September 30, December 31, Useful Lives 2019 2018 Leasehold improvements 1-12 years $ 10,486 $ 10,560 Furniture and computer and other equipment 3 years 4,282 3,816 Vehicles acquired under finance leases 3-5 years 7,106 6,907 21,874 21,283 Less: Accumulated depreciation and amortization (7,542 ) (10,553 ) Property and equipment, net $ 14,332 $ 10,730 The Company recorded depreciation and amortization expense related to property and equipment of $0.8 million and $0.9 million for the three months ended September 30, 2019 and 2018 . The Company recorded depreciation and amortization expense related to property and equipment of $1.8 million and $3.9 million for the nine months ended September 30, 2019 and 2018. Effective January 1, 2019, the Company adopted Topic 842. As part of the adoption, the Company reassessed all contracts existing at the adoption date. The Company determined that a number of vehicle leases that were previously classified as capital leases under Topic 840 were no longer classified as finance leases under Topic 842. This resulted in a reduction to the gross asset and accumulated depreciation and amortization balances related to vehicles and will result in lower depreciation and amortization expense related to property and equipment compared to prior periods.

Other Non-Current Assets

Other Non-Current Assets	9 Months Ended
	Sep. 30, 2019
Other Assets Noncurrent Disclosure [Abstract]
Other Non-Current Assets	7 . Other Non-Current Assets Other non-current assets consisted of the following (in thousands): September 30, December 31, 2019 2018 Costs to obtain contracts $ 559,492 $ — Accumulated amortization of costs to obtain contracts (65,204 ) — Operating lease right-of-use assets 38,292 — Sales incentives 10,006 8,588 Other non-current assets 25,286 19,502 Total other non-current assets $ 567,872 $ 28,090 The Company recorded amortization of costs to obtain contracts of $6.9 million and $18.2 million for the three and nine months ended September 30, 2019. Costs to obtain contracts are amortized over the initial terms of customer contracts, which are typically 20 years.

Intangible Assets

Intangible Assets	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets	8 . Intangible Assets Net intangible assets are included in other non-current assets, net and consisted of the following (in thousands): September 30, December 31, 2019 2018 Cost: Internal-use software $ 1,312 $ 1,020 Developed technology 522 522 Trademarks/trade names 201 201 Total carrying value 2,035 1,743 Accumulated amortization: Internal-use software (87 ) (781 ) Developed technology (376 ) (324 ) Trademarks/trade names (114 ) (99 ) Total accumulated amortization (577 ) (1,204 ) Total intangible assets, net $ 1,458 $ 539 The Company recorded a de minimis amount and $0.1 million of amortization expense for the three months ended September 30, 2019 and 2018, which is included within general and administrative expense on the condensed consolidated statements of operations. The Company recorded amortization expense of $0.2 million and $0.4 million for the nine months ended September 30, 2019 and 2018.

Accrued Compensation

Accrued Compensation	9 Months Ended
	Sep. 30, 2019
Accrued Compensation Disclosure [Abstract]
Accrued Compensation	9 . Accrued Compensation Accrued compensation consisted of the following (in thousands): September 30, December 31, 2019 2018 Accrued payroll $ 19,052 $ 16,352 Accrued commissions 21,595 9,168 Total accrued compensation $ 40,647 $ 25,520

Accrued and Other Current Liabi

Accrued and Other Current Liabilities	9 Months Ended
	Sep. 30, 2019
Payables And Accruals [Abstract]
Accrued and Other Current Liabilities	10 . Accrued and Other Current Liabilities Accrued and other current liabilities consisted of the following (in thousands): September 30, December 31, 2019 2018 Accrued unused commitment fees and interest $ 16,151 $ 14,102 Litigation Settlement 8,325 100 Accrued inventory 7,567 4,380 Current portion of operating lease liabilities 7,432 — Accrued professional fees 6,233 6,150 Accrued workers' compensation 6,024 4,033 Current portion of lease pass-through financing obligation 5,126 5,038 Workmanship accrual 3,724 2,630 Sales, use and property taxes payable 3,393 3,132 Other accrued expenses 6,263 3,295 Total accrued and other current liabilities $ 70,238 $ 42,860

Debt Obligations

Debt Obligations	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Debt Obligations	11 . Debt Obligations Debt obligations consisted of the following as of September 30, 2019 (in thousands, except interest rates): Principal Unamortized Debt Unused Borrowings Issuance Costs Net Carrying Value Borrowing Interest Maturity Outstanding Current Long-term Current Long-term Capacity Rate Date Solar asset backed notes, Series 2018-1 (1) $ 454,100 $ (76 ) $ (8,603 ) $ 3,919 $ 441,502 $ — 5.1 % October 2028 Solar asset backed notes, Series 2018-2 (2)(3) 338,294 (5 ) (6,457 ) 245 331,587 — 5.5 August 2023 2017 Term loan facility 183,116 (173 ) (4,326 ) 6,855 171,762 — 6.0 January 2035 2018 Forward flow loan facility 125,048 (94 ) (3,145 ) 2,396 119,413 — 4.7 (4) 2019 Forward flow loan facility 50,353 — (2,902 ) — 47,451 99,647 3.9 (5) Credit agreement 1,270 (1 ) (99 ) 17 1,153 — 6.5 February 2023 Revolving lines of credit ( 6) Warehouse facility 170,000 — — — 170,000 155,000 4.7 August 2023 Working capital facility ( 7) 131,100 — — 131,100 — — 5.4 March 2020 Total debt $ 1,453,281 $ (349 ) $ (25,532 ) $ 144,532 $ 1,282,868 $ 254,647 Debt obligations consisted of the following as of December 31, 2018 (in thousands, except interest rates): Principal Unamortized Debt Unused Borrowings Issuance Costs Net Carrying Value Borrowing Interest Maturity Outstanding Current Long-term Current Long-term Capacity Rate Date Solar asset backed notes, Series 2018-1 (1) $ 462,826 $ (74 ) $ (9,172 ) $ 3,655 $ 449,925 $ — 5.1 % October 2028 Solar asset backed notes, Series 2018-2 (2)(3) 342,833 (6 ) (7,388 ) 294 335,145 — 5.4 August 2023 2017 Term loan facility 188,922 (170 ) (4,614 ) 6,679 177,459 — 6.0 January 2035 2018 Forward flow loan facility 58,425 (43 ) (3,365 ) 1,512 53,505 71,575 5.2 (4) Credit agreement 1,283 (2 ) (118 ) 15 1,148 — 6.5 February 2023 Revolving lines of credit ( 6) Aggregation facility 50,000 — — — 50,000 325,000 5.7 September 2020 Working capital facility ( 7) 136,100 — — — 136,100 — 5.6 March 2020 Total debt $ 1,240,389 $ (295 ) $ (24,657 ) $ 12,155 $ 1,203,282 $ 396,575 (1) The interest rate disclosed in the table above is a weighted-average rate. The Series 2018-1 Notes are comprised of Class A and Class B Notes. Class A Notes accrue interest at 4.73%. Class B Notes accrue interest at 7.37%. (2) The Series 2018-2 Notes are comprised of Class A and Class B Notes. Class B Notes accrue interest at a rate of LIBOR plus 4.75%. Class A Notes accrue interest at a variable spread over LIBOR that results in a weighted average spread for all 2018-2 Notes of 2.95%. (3) The interest rate of these notes is partially hedged to an effective interest rate of 6.0% for $323.6 million of the principal borrowings. See Note 13—Derivative Financial Instruments. (4) The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than October 31, 2019. (5) The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than November 20, 2020. (6) Revolving lines of credit are not presented net of unamortized debt issuance costs. ( 7 ) This facility is recourse debt, which refers to debt that is collateralized by the Company’s general assets. All of the Company’s other debt obligations are non-recourse, which refers to debt that is only collateralized by specified assets or subsidiaries of the Company. The Company’s debt facilities include customary events of default, conditions to borrowing and covenants, including covenants that restrict, subject to certain exceptions, the Company’s ability to incur indebtedness, incur liens, make investments, make fundamental changes to its business, dispose of assets, make certain types of restricted payments or enter into certain related party transactions. Additionally, the Company is required to maintain certain financial measurements and interest rate swaps for certain debt facilities. These restrictions do not impact the Company’s ability to enter into investment funds, including those that are similar to those entered into previously. The Company’s debt facilities are secured by net cash flows from long-term customer contracts. The Company was in compliance with all debt covenants as of September 30, 2019. Solar Asset Backed Notes, Series 2018-1 In June 2018, a wholly owned subsidiary of the Company issued an aggregate principal amount of $400.0 million of Solar Asset Backed Notes, Series 2018-1, Class A (the “2018-1 Class A Notes”) and an aggregate principal amount of $66.0 million of Solar Asset Backed Notes, Series 2018-1, Class B (the “2018-1 Class B Notes” and together with the 2018-1 Class A Notes, the “2018-1 Notes”). The 2018-1 Class A Notes accrue interest at a fixed rate of 4.73% and have an anticipated repayment date of October 30, 2028. The 2018-1 Class B Notes accrue interest at a fixed rate of 7.37% and have an anticipated repayment date of October 30, 2028. In addition to customary events of default and covenants, the 2018-1 Notes are subject to unscheduled prepayment events that generally are customary in nature for solar securitizations of this type, including (1) asset coverage ratios falling below certain levels, (2) a debt service coverage ratio falling below certain levels, (3) the failure to maintain insurance, and (4) the failure to repay the notes in full prior to the anticipated repayment date for such class of notes. The occurrence of an unscheduled prepayment event or an event of default could result in the more rapid repayment of the 2018-1 Notes, and the occurrence of an event of default could, in certain instances, result in the liquidation of the collateral securing the 2018-1 Notes. The 2018-1 Notes are secured by, and payable solely from the cash flow generated by the membership interests in certain indirectly owned subsidiaries of the Company, each of which subsidiaries is the managing member of a project company that owns a pool of photovoltaic systems and related Solar Leases and PPAs and ancillary rights and agreements that were originated by a wholly owned subsidiary of the Company. As of September 30, 2019, the Company had $15.0 million in required reserves outstanding in collateral accounts with the administrative agent, which are included in restricted cash and cash equivalents. Solar Asset Backed Notes, Series 2018-2 In June 2018, a wholly owned subsidiary of the Company issued an aggregate principal amount of $296.0 million of Solar Asset Backed Notes, Series 2018-2, Class A (the “2018-2 Class A Notes”) and an aggregate principal amount of $49.0 million of Solar Asset Backed Notes, Series 2018-2, Class B (the “2018-2 Class B Notes” and together with the 2018-2 Class A Notes, the “2018-2 Notes”). The 2018-2 Class A Notes accrue interest at a variable spread over the London Interbank Offered Rate (“LIBOR”) that is intended to result in a weighted average spread for all 2018-2 Notes of 2.95%. The 2018-2 Class B Notes accrue interest at a spread over LIBOR of 4.75% or, if no 2018-2 Class A Notes are outstanding, 2.95%. The Company entered into an interest rate swap concurrent with the issuance of the 2018-2 Notes that results in an implied all-in interest rate of approximately 5.95%. See Note 13—Derivative Financial Instruments. The 2018-2 Notes have a stated maturity of August 29, 2023. The 2018-2 Notes have the same events of default, covenants and unscheduled prepayment events as the 2018-1 Notes. In addition, the 2018-2 Notes are subject to unscheduled prepayment events relating to certain change of control events and certain liquidity requirements. As of September 30, 2019, the Company had $25.2 million in required reserves outstanding in collateral accounts with the administrative agent, which are included in restricted cash and cash equivalents. 2016 Term Loan Facility In June 2018, the Company used proceeds from the issuance of the 2018-1 Notes and 2018-2 Notes to pay off the outstanding balance of $282.3 million on the credit facility entered into by a wholly owned subsidiary of the Company in August 2016 (the “2016 Term Loan Facility”) and terminated the credit agreement. At termination, the outstanding balance was composed of $281.8 million of principal and $0.5 million of accrued interest. The termination of the 2016 Term Loan Facility was accounted for as a debt extinguishment. As such, the remaining $6.9 million of unamortized debt issuance costs related to the 2016 Term Loan Facility were recognized in interest expense during the year ended December 31, 2018. There was no prepayment fee associated with the termination of the 2016 Term Loan Facility. Subordinated HoldCo Facility In June 2018, the Company used proceeds from the issuance of the 2018-1 Notes and 2018-2 Notes to pay off the outstanding balance of $206.4 million on the credit facility entered into by a wholly owned subsidiary of the Company in March 2016 (the “Subordinated HoldCo Facility”) and terminated the financing agreement. At termination, the outstanding balance was composed of $196.6 million of principal, $3.9 million of accrued interest, and a prepayment fee of $5.9 million, which was calculated as 3.0% of the outstanding principal balance. The termination of the Subordinated HoldCo Facility was accounted for as a debt extinguishment. As such, the remaining $2.9 million of unamortized debt issuance costs related to the Subordinated HoldCo Facility were recognized in interest expense during the year ended December 31, 2018. The prepayment fee of $5.9 million was also recognized in interest expense during the year ended December 31, 2018. 2017 Term Loan Facility In January 2017, a wholly owned subsidiary of the Company entered into a long-term fixed rate credit agreement (the “2017 Term Loan Facility”). Interest on borrowings accrues at an annual fixed rate equal to 6.0% and is payable in arrears. Certain principal payments are due on a quarterly basis, subject to the occurrence of certain events. As of September 30, 2019, the Company had $20.2 million in required reserves 2018 Forward Flow Loan Facility In August 2018, a subsidiary that is indirectly owned by the Company together with investors, entered into a loan agreement (the “2018 Forward Flow Loan Facility”, formerly known as the “Forward Flow Loan Facility”) pursuant to which the Company may borrow up to an aggregate principal amount of $130.0 million. The Company may make multiple borrowings under the 2018 Forward Flow Loan Facility during the availability period, which will continue no later than October 31, 2019. After the availability period, all outstanding loans under the 2018 Forward Flow Loan Facility will be aggregated into a single term loan with a maturity date 20 years after the date of aggregation. Interest on each loan will accrue at an annual rate equal to the U.S. swap rate for the weighted-average life of such loan, plus an applicable margin equal to the greater of (a) 1.9% plus a spread adjustment based on the risk premium on the borrowing date relative to the market index-based risk premium on the closing date and (b) 1.5%. Scheduled principal payments are due on a quarterly basis, at the end of January, April, July and October of each year. Upon the occurrence of certain events, the Company will be required to make prepayments of the loans, including payment of a make-whole amount in certain circumstances. As of September 30, 2019, the Company had $6.4 million in required reserves outstanding in collateral accounts with the administrative agent, which were included in restricted cash and cash equivalents. 2019 Forward Flow Loan Facility In May 2019, a subsidiary that is indirectly owned by the Company together with investors, entered into a loan agreement (the “2019 Forward Flow Loan Facility”) pursuant to which the Company may borrow up to an aggregate principal amount of $150.0 million. The Company may make multiple borrowings under the 2019 Forward Flow Loan Facility during the availability period, which will continue no later than November 20, 2020. After the availability period, all outstanding loans under the 2019 Forward Flow Loan Facility will be aggregated into a single term loan with a maturity date 20 years after the date of aggregation. On any anniversary of the date of aggregation occurring from and after the sixth such anniversary, upon notice to the lenders, the Company may borrow additional loans under the 2019 Forward Flow Loan Facility if the Company is projected to have sufficient net cash flow to service such additional debt. If any lender declines to fund such additional loans, the Company will have the right to prepay outstanding loans from such lender in an amount equal to 102.5% of such loans, plus accrued and unpaid interest, without any make-whole amount. Interest on each loan will accrue at an annual rate equal to the greater of (a) 4.70% and (b) the U.S. Treasury rate for the weighted-average life of such loan, plus an applicable margin equal to 2.35%. Scheduled principal payments are due on a quarterly basis, at the end of January, April, July and October of each year. Upon the occurrence of certain events, the Company will be required to make prepayments of the loans, including payment of a make-whole amount in certain circumstances. As of September 30, 2019, the Company had $2.0 million in required reserves outstanding in collateral accounts with the administrative agent, which were included in restricted cash and cash equivalents. Credit Agreement In February 2016, a wholly owned subsidiary of the Company entered into a fixed rate credit agreement (the “Credit Agreement”). Principal and interest payments under the Credit Agreement are paid quarterly over the term of the loan. Interest accrues on borrowings at a fixed rate of 6.50%. Warehouse Facility In August 2019, a wholly owned subsidiary of the Company entered into a floating rate revolving warehouse facility (the “Warehouse Facility”) pursuant to which it may borrow up to an aggregate principal amount of $325.0 million, expandable up to $400.0 million, from certain financial institutions for which Bank of America, N.A. is acting as administrative agent and collateral agent. During the period in which the Company may make borrowings under the Warehouse Facility, which is currently anticipated to continue until August 2022, interest on borrowings accrues at an annual rate equal to the applicable adjusted LIBOR rate plus 2.375%. Thereafter, interest will accrue at an annual rate equal to the applicable adjusted LIBOR rate plus 3.375%. In addition, the Company is required to maintain interest rate hedging arrangements such that not less than 90% of the aggregate expected amortization profile of all outstanding revolving advances is subject to a fixed interest rate or other interest rate protection. Initially, subject to the terms of the Warehouse Facility, only interest payments are due on a quarterly basis, through the availability period, and then certain principal and interest payments may be due. These payments will occur on the 15 th of January, April, July and October of each year, subject to the occurrence of certain events, including a borrowing base deficiency and dispositions with respect to any of the collateral. Principal and interest payable under the Warehouse Facility mature in four years and optional prepayments, in whole or in part, are permitted under the Warehouse Facility no more than once per month, without premium or penalty apart from any customary LIBOR breakage provisions. As of September 30, 2019, the Company had $4.8 million in required reserves outstanding in collateral accounts with the administrative agent, which were included in restricted cash and cash equivalents. Aggregation Facility In August 2019, the Company used proceeds from the Warehouse Facility to pay off the outstanding balance of $121.4 million on the aggregation credit facility entered into by a wholly owned subsidiary of the Company in September 2014 (as amended, the “Aggregation Facility”) and terminated the facility. At termination, the outstanding balance was composed of $115.0 million of principal, $0.6 million of accrued interest and $5.8 million to settle related interest rate swaps. The termination of the Aggregation Facility was accounted for as a modification of a line of credit. Of the remaining $3.6 million of unamortized debt issuance costs, $2.5 million was recognized in interest expense during the nine months ended September 30, 2019 and $1.1 million was deferred and will be amortized over the term of the Warehouse Facility. Working Capital Facility In March 2015, a wholly owned subsidiary of the Company entered into a revolving credit agreement (the “Working Capital Facility”) pursuant to which the Company may borrow up to an aggregate principal amount of $150.0 million from certain financial institutions. In addition to the outstanding borrowings as of September 30, 2019, the Company had established letters of credit under the Working Capital Facility for up to $18.9 million related to insurance and retail contracts. Prepayments are permitted under the Working Capital Facility. Interest accrues on borrowings at a floating rate equal to, depending on the type of borrowing, (1) a rate equal to the Eurodollar Rate for the interest period divided by one minus the Eurodollar Reserve Percentage, plus a margin of 3.25%; or (2) the highest of (a) the Federal Funds Rate plus 0.50%, (b) the Citibank prime rate and (c) the one-month interest period Eurodollar rate plus 1.00%, plus a margin of 2.25%. Interest is payable depending on the type of borrowing at the end of (1) the interest period that the Company may elect as a term, not to exceed three months, (2) quarterly or (3) at maturity of the Working Capital Facility. The Company is required to maintain $30.0 million in cash and cash equivalents and certain investments as of the last day of each quarter. As of September 30, 2019, the Company was in compliance with such covenants.

Leases

Leases	9 Months Ended
	Sep. 30, 2019
Lessee Disclosure [Abstract]
Leases	12 . Leases The Company is the lessee in all of its lease arrangements. The Company did not enter into any leases with related parties during the presented periods. The Company makes significant assumptions and judgments when assessing contracts for lease components, determining lease classifications and calculating right-of-use asset and lease liability values. These assumptions and judgements may include the useful lives and fair values of the leased assets, the implicit rate underlying the Company’s leases, the Company’s incremental borrowing rate or the Company’s intent to exercise or not exercise options available in lease contracts. Lease costs and other information consisted of the following (in thousands, except terms and rates): Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Lease cost Finance lease cost: Amortization of right-of-use assets $ 465 $ 1,125 Interest on lease liabilities 96 180 Operating lease cost 2,818 8,358 Short-term lease cost 413 1,714 Total lease cost $ 3,792 $ 11,377 Other information Finance leases: Operating cash outflows from finance leases $ 96 $ 180 Financing cash outflows from finance leases $ 377 $ 954 Right-of-use assets obtained in exchange for new finance lease liabilities $ 2,321 $ 6,077 Weighted-average remaining lease term - finance leases (in years) 3.6 3.6 Weighted-average discount rate - finance leases 7.4 % 7.4 % Operating leases: Operating cash outflows from operating leases $ 2,870 $ 8,505 Right-of-use assets obtained in exchange for new operating lease liabilities $ 545 $ 9,210 Weighted-average remaining lease term - operating leases (in years) 9.3 9.3 Weighted-average discount rate - operating leases 8.0 % 8.0 % Finance Leases The Company’s finance leases relate to fleet vehicles. All of the Company’s fleet vehicles are leased pursuant to master lease agreements for a period of three to five years. The master lease agreements allow for the Company to extend fleet vehicle leases on a month-to-month basis. For administrative convenience, the Company will often commit to extension periods of up to one year. As the extensions are not always utilized and are not contractually bound to a specific period of time, these extensions are not included in the initial right-of-use assets and lease liabilities. Instead, these extensions are treated as new leases. The master lease agreements stipulate minimum residual value guarantees that are not typically recognized as part of the Company’s right-of use assets and lease liabilities as these residual value guarantees are not probable of being owed. The rates implicit in the Company’s fleet vehicle finance leases are determinable, and the Company uses those rates to calculate the present value of its lease liabilities related to fleet vehicles. Future minimum lease payments for the Company’s finance leases as of September 30, 2019 were as follows (in thousands): 2019 $ 511 2020 1,839 2021 1,815 2022 1,689 2023 769 Thereafter — Total minimum lease payments 6,623 Less: interest 786 Present value of finance lease obligations 5,837 Less: current portion 1,529 Long-term portion $ 4,308 Operating Leases The Company has entered into lease agreements for offices, warehouses and related equipment located in states in which the Company conducts operations. The Company’s corporate office lease was amended in February 2019 to extend the term by an additional three years, for a total lease term of 15 years. The corporate office lease includes options to extend the lease term for two additional periods of five years. The Company’s warehouse lease agreements range from a term of two to nine years, including exercised options to extend, with five years being the most common lease term. The warehouse lease agreements typically include options to extend the lease term. The Company’s operating lease agreements typically do not include purchase options. The Company includes lease extension options in the right-of-use asset and lease liability when the Company is reasonably certain it will exercise the options. The Company’s equipment lease agreements range from three to five years. The rates implicit in the Company’s operating leases are not readily determinable. As such, the Company uses its incremental borrowing rate to calculate the present value of its operating lease liabilities. For all non-cancellable lease arrangements, there are no bargain renewal options, penalties for failure to renew, or any guarantee by the Company of the lessor’s debt or a loan from the Company to the lessor related to the leased property. Future minimum lease payments under non-cancellable operating leases as of September 30, 2019 were as follows (in thousands): 2019 $ 2,845 2020 10,466 2021 8,090 2022 5,815 2023 4,780 Thereafter 36,680 Total minimum lease payments 68,676 Less: present value impact 21,360 Present value of operating lease obligations 47,316 Less: current portion 7,432 Long-term portion $ 39,884

Derivative Financial Instrument

Derivative Financial Instruments	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Derivative Financial Instruments	13 . Derivative Financial Instruments Derivative financial instruments at fair value consisted of the following (in thousands): September 30, 2019 Fair Value Balance Sheet Location Derivatives designated as hedging instruments: Interest rate swaps $ 33,323 Other non-current liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,978 Other non-current liabilities December 31, 2018 Fair Value Balance Sheet Location Derivatives designated as hedging instruments: Interest rate swaps $ 9,884 Other non-current liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,262 Other non-current liabilities Interest rate swaps $ 130 Other non-current assets The Company is exposed to interest rate risk relating to its outstanding debt facilities that have variable interest rates. The Company was previously required to maintain interest rate swaps on a portion of the outstanding loan balance of the Aggregation Facility. The Aggregation Facility and its related interest rates swaps were terminated in August 2019. The settled interest rate swaps were not designated as hedge instruments and changes in the fair value were recorded in other expense (income), net. In connection with the Warehouse Facility, the Company is required to maintain interest rate swaps such that not less than 90% of the aggregate expected amortization profile of all outstanding revolving advances is subject to a fixed interest rate. The Company is required to meet this threshold within five business days after the end of each quarterly period. As of September 30, 2019, the Company had entered into interest rate swaps with an aggregate notional amount of approximately $142.5 million. The Company entered into additional interest rate swaps within five business days of quarter end with an aggregate notional amount of approximately $10.5 million. The Company did not designate these interest rate swaps as hedge instruments and accounts for any changes in fair value in other expense (income), net. In connection with the 2018-2 Notes, the Company entered into interest rate swaps to offset changes in the variable interest rate for a portion of these notes. As of September 30, 2019, the notional amount of these interest rate swaps was $323.6 million. The notional amount of the interest rate swaps decreases through the maturity of the 2018-2 Notes, similar to the Company’s estimated semi-annual principal payments on the 2018-2 Notes through August 2023. The interest rate swaps are designated as cash flow hedges, and unrealized gains or losses are recorded in other comprehensive income (“OCI”). The amount of accumulated other comprehensive (loss) income (“AOCI”) expected to be reclassified to interest expense within the next 12 months is approximately $4.3 million. The Company will discontinue the hedge accounting designation of these derivatives if interest payments on LIBOR-indexed floating rate loans compared to the payments under the derivatives are no longer highly effective. The Company records derivatives at fair value. The losses (gains) on derivatives designated as cash flow hedges recognized in OCI, before tax effect, consisted of the following (in thousands): Three Months Ended September 30, 2019 2018 Derivatives designated as cash flow hedges: Interest rate swaps $ 7,889 $ (3,966 ) Nine Months Ended September 30, 2019 2018 Derivatives designated as cash flow hedges: Interest rate swaps $ 24,516 $ (8,284 ) The losses (gains) on derivative financial instruments recognized in the condensed consolidated statements of operations, before tax effect, consisted of the following (in thousands): Three Months Ended September 30, 2019 2018 Interest expense, net Other expense (income), net Interest expense, net Other expense (income), net Total amounts presented in the income statement line items $ 22,804 $ 3,907 $ 18,715 $ (1 ) Derivatives designated as cash flow hedges: Interest rate swaps Losses reclassified from AOCI into income $ 517 $ — $ 535 $ — Derivatives not designated as hedging instruments: Interest rate swaps Losses recognized in income — 3,906 — — Total losses $ 517 $ 3,906 $ 535 $ — Nine Months Ended September 30, 2019 2018 Interest expense, net Other expense (income), net Interest expense, net Other expense (income), net Total amounts presented in the income statement line items $ 61,403 $ 6,657 $ 46,973 $ (6,371 ) Derivatives designated as cash flow hedges: Interest rate swaps Losses (gains) reclassified from AOCI into income $ 1,077 $ — $ (22,181 ) $ — Derivatives not designated as hedging instruments: Interest rate swaps Losses (gains) recognized in income — 6,656 — (4,252 ) Total losses (gains) $ 1,077 $ 6,656 $ (22,181 ) $ (4,252 )

Investment Funds

Investment Funds	9 Months Ended
	Sep. 30, 2019
Summarized Financial Data Of Subsidiary [Abstract]
Investment Funds	14 . Investment Funds The Company has formed investment funds for the purpose of funding the purchase of solar energy systems under long-term customer contracts. As of September 30, 2019 and December 31, 2018, the aggregate carrying value of these funds’ assets and liabilities (after elimination of intercompany transactions and balances) in the Company’s condensed consolidated balance sheets were as follows (in thousands): September 30, December 31, 2019 2018 Assets Current assets: Cash and cash equivalents $ 103,921 $ 62,350 Accounts receivable, net 17,385 6,593 Prepaid expenses and other current assets 2,384 1,289 Total current assets 123,690 70,232 Restricted cash and cash equivalents 8,361 2,443 Solar energy systems, net 1,541,344 1,752,271 Other non-current assets, net 459,771 10,888 Total assets $ 2,133,166 $ 1,835,834 Liabilities Current liabilities: Distributions payable to non-controlling interests and redeemable non-controlling interests $ 17,328 $ 7,846 Current portion of long-term debt 2,396 1,512 Current portion of deferred revenue 2,272 2,320 Accrued and other current liabilities 6,027 4,860 Total current liabilities 28,023 16,538 Long-term debt, net of current portion 166,864 53,505 Deferred revenue, net of current portion 11,484 9,694 Other non-current liabilities 375 1,023 Total liabilities $ 206,746 $ 80,760 Under the fund agreements, cash distributions of income and other receipts by the funds, net of agreed-upon expenses and estimated expenses, tax benefits and detriments of income and loss, and tax benefits of tax credits, are assigned to the fund investors and the Company’s subsidiaries as specified in contractual arrangements. As such, the cash held in investment funds is not readily available to the Company due to the timing of distributions. Certain of these fund arrangements have call and put options to acquire the investor’s equity interest as specified in the contractual agreements. Once the investor’s equity interest is acquired by the Company, the assets, liabilities and operations of the investment fund become wholly owned and no longer require an assessment of non-controlling interests. Fund investors for three of the funds are managed indirectly by The Blackstone Group L.P. (the “Sponsor”) and are considered related parties. As of September 30, 2019 and December 31, 2018, the cumulative total of contributions into the VIEs by all investors was $1,849.4 million and $1,565.3 million. Of these contributions, a cumulative total of $110.0 million was contributed by related parties in prior periods. A third-party provider has agreed to perform backup maintenance services for all funds, if necessary. Lease Pass-Through Financing Obligation During 2015, a wholly owned subsidiary of the Company entered into a lease pass-through fund arrangement under which the Company contributed solar energy systems and the investor contributed cash. The net carrying value of the related solar energy systems was $44.3 million and $55.8 million as of September 30, 2019 and December 31, 2018. The Company accounts for the residual of the large upfront payments, net of amounts allocated to the ITCs, and subsequent periodic payments received from the fund investor as a borrowing by recording the proceeds received as a lease pass-through financing obligation, which will be repaid through customer payments that will be received by the investor. Under this approach, the Company continues to account for the arrangement with the customers in its condensed consolidated financial statements, whether the cash generated from the customer arrangements is received by the Company’s wholly owned subsidiary or paid directly to the fund investor. A portion of the amounts received by the fund investor from customer payments is applied to reduce the lease pass-through financing obligation, and the balance is allocated to interest expense. The customer payments are recognized into revenue based on cash receipts during the period as required by GAAP. Interest is calculated on the lease pass-through financing obligation using the effective interest rate method. The effective interest rate is the interest rate that equates the present value of the cash amounts to be received by a fund investor over the master lease term with the present value of the cash amounts paid by the investor to the Company, adjusted for any payments made by the Company. Any additional master lease prepayments by the investor would be recorded as an additional lease pass-through financing obligation, while any refunds of master lease prepayments would reduce the lease pass-through financing obligation. The lease pass-through financing obligation is nonrecourse. As of September 30, 2019 and December 31, 2018, the Company had recorded financing liabilities of $4.7 million and $5.3 million related to this fund arrangement, which represent the lease pass-through financing obligation recorded in other liabilities. Guarantees With respect to the investment funds, the Company and the fund investors have entered into guaranty agreements under which the Company guarantees the performance of certain financial obligations of its subsidiaries to the investment funds. These guarantees do not result in the Company being required to make payments to the fund investors unless such payments are mandated by the investment fund governing documents and the investment fund fails to make such payment. Each of the Company’s investment funds and financing subsidiaries maintains separate books and records from each other and from the Company. The assets of each investment fund are not available to satisfy the debts or obligations of any other investment fund, subsidiary or the Company. The Company is contractually obligated to make certain VIE investors whole for losses that the investors may suffer in certain limited circumstances resulting from the disallowance or recapture of ITCs. The Company has concluded that the likelihood of a significant recapture event is remote and consequently has not recorded any liability in the condensed consolidated financial statements for any potential recapture exposure. The maximum potential future payments that the Company could have to make under this obligation would depend on the Internal Revenue Service (“IRS”) successfully asserting upon audit that the fair market values of the solar energy systems sold or transferred to the funds as determined by the Company exceeded the allowable basis for the systems for purposes of claiming ITCs. The fair market values of the solar energy systems and related ITCs are determined and the ITCs are allocated to the fund investors in accordance with the funds’ governing agreements. Due to uncertainties associated with estimating the timing and amounts of distributions, the likelihood of an event that may trigger repayment, forfeiture or recapture of ITCs to such investors, and the fact that the Company cannot determine how the IRS will evaluate system values used in claiming ITCs, the Company cannot determine the potential maximum future payments that are required under these guarantees. As of September 30, 2019, the Company has not made any payments under these guarantees. However, several recent investment funds, the 2018-1 Notes and the 2018-2 Notes have required the Company to prepay insurance premiums to cover the risk of ITC recapture. The Company amortizes this prepaid insurance expense over the ITC recapture period. The Company had prepaid insurance balances of $7.7 million and $8.3 million as of September 30, 2019 and December 31, 2018. From time to time, the Company incurs fees for non-performance, which non-performance may include, but is not limited to, delays in the installation process and interconnection to the power grid of solar energy systems and other factors. Based on the terms of the investment fund agreements, the Company will either reimburse a portion of the fund investor’s capital or pay the fund investor a non-performance fee. No distributions were paid to reimburse fund investors during the three and nine months ended September 30, 2019. As of September 30, 2019, As a result of the guaranty arrangements in certain funds, the Company was required to hold a minimum cash balance of $10.0 million as of September 30, 2019 and December 31, 2018, which is classified as restricted cash and cash equivalents.

Redeemable Non-Controlling Inte

Redeemable Non-Controlling Interests and Equity	9 Months Ended
	Sep. 30, 2019
Equity [Abstract]
Redeemable Non-Controlling Interests and Equity	15 . Redeemable Non-Controlling Interests and Equity Common Stock The Company had shares of common stock reserved for issuance as follows (in thousands): September 30, December 31, 2019 2018 Shares available for grant under equity incentive plans 13,340 13,323 Restricted stock units issued and outstanding 6,791 6,172 Stock options issued and outstanding 5,588 3,394 Long-term incentive plan 2,706 2,706 Total 28,425 25,595 Redeemable Non-Controlling Interests and Non-Controlling Interests Seven of the investment funds include a right for the non-controlling interest holder to require the Company’s wholly owned subsidiary to purchase all of its membership interests in the fund (each, a “Put Option”). The purchase price for the fund investor’s interest in the seven investment funds under the Put Options is the greater of fair market value at the time the option is exercised and a specified amount, ranging from $2.1 million to $4.1 million. The Put Options for these seven investment funds are exercisable beginning on the date that specified conditions are met for each respective fund. The first of the Put Options are expected to become exercisable beginning in the second quarter of 2021. Because the Put Options represent redemption features that are not solely within the control of the Company, the non-controlling interests in these investment funds are presented outside of permanent equity. Redeemable non-controlling interests are recorded using the greater of their carrying value at each reporting date (which is impacted by attribution under the hypothetical liquidation at book value (“HLBV”) method) or their estimated redemption value in each reporting period. In all investment funds except one, the Company’s wholly owned subsidiary has the right to require the non-controlling interest holder to sell all of its membership units to the Company’s wholly owned subsidiary (each, a “Call Option”). The purchase price for the fund investors’ interests under the Call Options varies by fund, but is generally the greater of a specified amount, which ranges from approximately $1.2 million to $7.0 million, the fair market value of such interest at the time the option is exercised, or an amount that causes the fund investor to achieve a specified return on investment. The Call Options are exercisable beginning on the date that specified conditions are met for each respective fund. The first of the Call Options are expected to become exercisable beginning in the third quarter of 2020.

Equity Compensation Plans

Equity Compensation Plans	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Equity Compensation Plans	16 . Equity Compensation Plans Equity Incentive Plans 2014 Equity Incentive Plan The Company currently grants equity awards through its 2014 Equity Incentive Plan (the “2014 Plan”). Under the 2014 Plan, the Company may grant stock options, restricted stock, restricted stock units (“RSUs”), stock appreciation rights, performance stock units, performance shares and performance awards to its employees, directors and consultants, and its parent and subsidiary corporations’ employees and consultants. As of September 30, 2019, a total of 13.3 million shares of common stock were available to grant under the 2014 Plan, subject to adjustment in the case of certain events. The number of shares available to grant under the 2014 Plan is subject to an annual increase on the first day of each year. In accordance with the annual increase, an additional 4.8 million shares became available to grant in January 2019 under the 2014 Plan. Stock Options Stock Option Activity Stock option activity for the nine months ended September 30, 2019 was as follows (in thousands, except term and per share amounts): Weighted- Weighted- Average Shares Average Remaining Aggregate Underlying Exercise Contractual Intrinsic Options Price Term (in years) Value Outstanding—December 31, 2018 3,394 $ 2.77 $ 4,689 Granted 2,379 5.33 Exercised (139 ) 2.18 Cancelled (46 ) 6.65 Outstanding—September 30, 2019 5,588 $ 3.84 7.7 $ 15,834 Options vested and exercisable—September 30, 2019 2,312 $ 2.44 5.6 $ 9,963 RSUs RSU activity for the nine months ended September 30, 2019 was as follows (awards in thousands): Weighted- Average Number of Grant Date Awards Fair Value Outstanding at December 31, 2018 6,172 $ 3.84 Granted 2,926 5.89 Vested (1,834 ) 3.86 Forfeited (473 ) 4.28 Outstanding at September 30, 2019 6,791 $ 4.68 Stock-Based Compensation Expense Stock-based compensation was included in operating expenses as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of revenue $ 467 $ 361 $ 1,203 $ 984 Sales and marketing 756 754 2,297 2,668 General and administrative 2,891 1,956 8,390 6,125 Research and development 36 32 95 107 Total stock-based compensation $ 4,150 $ 3,103 $ 11,985 $ 9,884 Unrecognized stock-based compensation expense for RSUs and stock options as of September 30, 2019 was as follows (in thousands, except years): Unrecognized Weighted- Stock-Based Average Period Compensation of Recognition Expense (in years) RSUs $ 21,414 1.8 Stock options 6,987 2.1 Total unrecognized stock-based compensation expense $ 28,401

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income Taxes	17 . Income Taxes The income tax expense for the three months ended September 30, 2019 and 2018 was calculated on a discrete basis resulting in a consolidated quarterly effective income tax rate of (71.3)% and (54.7)%. For the nine months ended September 30, 2019 and 2018 the Company’s consolidated effective income tax rate was (56.7)% and (70.5)%. The Company sells solar energy systems to its investment funds for income tax purposes. As the investment funds are consolidated by the Company, the gain on the sale of the solar energy systems is eliminated in the condensed consolidated financial statements. However, this gain is recognized for tax reporting purposes. The Company accounts for the income tax consequences of these intra-entity transfers as a component of income tax expense during the period in which the transfers occur.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2019
Related Party Transactions [Abstract]
Related Party Transactions	18 . Related Party Transactions The Company’s condensed consolidated statements of operations included related party transactions of $0.5 million and $0.3 million within sales and marketing for the three months ended September 30, 2019 and 2018. The Company’s condensed consolidated statements of operations included related party transactions of $1.5 million and $1.7 million within sales and marketing for the nine months ended September 30, 2019 and 2018. Vivint Services The Company has negotiated and entered into a number of agreements with its sister company, Vivint, Inc. (“Vivint”). In August 2017, the Company entered into a sales dealer agreement with Vivint, pursuant to which each company will act as a non-exclusive dealer for the other party to market, promote and sell each other’s products. The agreement had an initial term of two years and automatically renewed for a one-year term in August 2019. The agreements will continue to automatically renew for successive one-year terms unless written notice of termination is provided by one of the parties to the other. The Company and Vivint also agreed to extend the term of the non-solicitation provisions under an existing non-competition agreement to match the term of the sales dealer agreement. The Company made payments under agreements with Vivint of $0.9 million and $6.1 million for the three months ended September 30, 2019 and 2018. These amounts reflect the level of services provided by Vivint on behalf of the Company. The Company made payments under these agreements of $7.1 million and $11.4 million for the nine months ended September 30, 2019 and 2018. Under agreements with Vivint, the Company recorded a receivable balance from Vivint of $0.5 million in prepaid expenses and other current assets as of September 30, 2019. A payable balance to Vivint of $0.2 million was recorded in accounts payable as of December 31, 2018. Advances Receivable — Net amounts due from direct-sales professionals were $6.0 million and $5.2 million as of September 30, 2019 and December 31, 2018. The Company provided a reserve of $0.3 million and $0.9 million as of September 30, 2019 and December 31, 2018 related to advances to direct-sales professionals who have terminated their employment agreement with the Company. Investment Funds Fund investors for three of the investment funds are indirectly managed by the Sponsor and accordingly are considered related parties. The Company accrued equity distributions to these entities of $1.9 million and $1.5 million as of September 30, 2019 and December 31, 2018, included in distributions payable to non-controlling and redeemable non-controlling interests. See Note 14—Investment Funds.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	19 . Commitments and Contingencies Non-Cancellable Operating Leases See Note 12—Leases for details regarding the Company’s lease arrangements. Letters of Credit As of September 30, 2019, the Company had established letters of credit under the Working Capital Facility for up to $18.9 million related to insurance and retail contracts. Indemnification Obligations From time to time, the Company enters into contracts that contingently require it to indemnify parties against claims. These contracts primarily relate to provisions in the Company’s services agreements with related parties that may require the Company to indemnify the related parties against services rendered; and certain agreements with the Company’s officers and directors under which the Company may be required to indemnify such persons for liabilities. In addition, under the terms of the agreements related to the Company’s investment funds and other material contracts, the Company may also be required to indemnify fund investors and other third parties for liabilities. For further information see Note 14—Investment Funds. Residual Commission Payments The Company pays a portion of sales commissions to its sales professionals on a deferred basis. The amount deferred is based on the value of the system sold by the sales professional and payment is based on the sales professional remaining employed by the Company. As this amount is earned over time, it is not considered an incremental cost of obtaining the contract due to the requirement that the sales professional remain in the Company’s service. As a result, the amount that is earned over time is expensed by the Company over the deferment period. As of September 30, 2019, the total estimated obligation that is currently not recorded in the Company’s condensed consolidated financial statements, but that will be earned and expensed over the deferment period was $8.5 million. As part of the settlement of the February 2018 class action (see “—Legal Proceedings” below), it was agreed that for certain sales professionals who were part of the Company’s residual commission plan who terminate after August 31, 2019, the Company will be required to pay 50% of unpaid deferred residual commissions in equal installments over the 18 months following such termination. Previously, amounts unpaid under the residual commissions plan would be forfeited when these certain sales professionals terminated their employment. As such, the Company’s accrual for the residual commission plan was increased by $5.9 million, which was recorded in sales and marketing expense as of September 30, 2019, to accrue for the portion of the residual payments that were considered earned as a result of the settlement. Legal Proceedings In February 2018, two former employees, on behalf of themselves and other direct sellers, named the Company in a putative class and Private Attorneys General Act action in San Diego County Superior Court, California, alleging that the Company misclassified those employees and violated other wage and hour laws. The complaint seeks unspecified damages and statutory penalties for the alleged violations. The Company disputes the allegations and has retained counsel to defend it in the litigation. On October 7, 2019, the Company entered into a class action settlement agreement, pursuant to which the Company has agreed to pay up to $7.25 million to settle the claims in the lawsuit, which was accrued by the Company in general and administrative expense for the current period ending September 30, 2019. The settlement is subject to court approval, and a preliminary approval hearing is currently scheduled for December 6, 2019. If the court grants preliminary approval, the Company expects that the court will schedule a final approval hearing in mid-2020. In March 2018, the New Mexico Attorney General’s office filed an action against the Company and several of its officers in New Mexico State Court, alleging violation of state consumer protection statutes and other claims. The Company disputes the allegations in the lawsuit and intends to defend itself in the action. The Company is unable to estimate a range of loss, if any, were there to be an adverse final decision. If an unfavorable outcome were to occur in this case, it is possible that the impact could be material to the Company’s results of operations in the period(s) in which any such outcome becomes probable and estimable. In July 2018, an individual filed a putative class action lawsuit in the U.S. District Court for the District of Columbia, purportedly on behalf of himself and other persons who received certain telephone calls. The lawsuit alleges that the Company violated the Telephone Consumer Protection Act and some of its implementing regulations. The complaint seeks statutory penalties for each alleged violation. The Company disputes the allegations in the complaint, has retained counsel and intends to vigorously defend itself in the litigation. In August 2019, the Company reached a settlement in principle to resolve the class action on a nationwide basis for a payment of approximately $1.0 million (including plaintiff’s attorneys’ fees), which was accrued by the Company in general and administrative expense for the current period ending September 30, 2019. In November 2019, the parties filed a joint motion with the court seeking preliminary approval of the settlement. That approval is pending. In October 2018, a former employee filed a representative action in Sacramento County Superior Court, California, pursuant to California’s Private Attorneys General Act alleging that the Company violated California labor and employment laws by, among other things, failing to provide its employees with rest and meal breaks. The Company disputes the allegations in the complaint and has retained counsel to represent it in the litigation. The Company is unable to estimate a range of loss, if any, at this time. If an unfavorable outcome were to occur in the case, it is possible that the impact could be material to the Company’s results of operations in the period(s) in which any such outcome becomes probable and estimable. In October 2018, a former sales professional filed a representative action in Orange County Superior Court, California, pursuant to California’s Private Attorneys General Act alleging that the Company violated California labor and employment laws by, among other things, failing to properly compensate its direct sellers and reimburse them for business expenses. The Company disputes the allegations in the complaint. The resolution of the February 2018 class action referenced above is expected to resolve the representative claims pursuant to California’s Private Attorneys General Act. In June 2019, a former sales professional filed a representative action in San Diego County Superior Court, California, pursuant to California’s Private Attorneys General Act alleging that the Company violated California labor and employment laws by, among other things, failing to properly compensate its direct sellers and reimburse them for business expenses. The Company disputes the allegations in the complaint. The resolution of the February 2018 class action referenced above is expected to resolve the representative claims pursuant to California’s Private Attorneys General Act. In October 2019, two separate, purported stockholders filed separate putative class actions in the U.S. District Court for the Eastern District of New York purportedly on behalf of themselves and all others similarly situated. The lawsuits allege violations of federal securities laws and seek unspecified compensatory damages, attorneys’ fees and costs. The Company has not yet been served with either complaint and reserves all of its rights and objections with regard to service of process, jurisdictional challenges, and venue as well as any other objections and motions related to the complaints. The Company disputes the allegations in the complaints and has retained counsel to represent it in the litigation. The Company is unable to estimate a range of loss, if any, at this time. If an unfavorable outcome were to occur in either case, it is possible that the impact could be material to the Company’s results of operations in the period(s) in which any such outcome becomes probable and estimable. In addition to the matters discussed above, in the normal course of business, the Company has from time to time been named as a party to various legal claims, actions and complaints. While the outcome of these matters cannot currently be predicted with certainty, the Company does not currently believe that the outcome of any of these claims will have a material adverse effect, individually or in the aggregate, on its consolidated financial position, results of operations or cash flows. The Company accrues for losses that are probable and can be reasonably estimated. The Company evaluates the adequacy of its legal reserves based on its assessment of many factors, including interpretations of the law and assumptions about the future outcome of each case based on available information.

Basic and Diluted Net Loss Per

Basic and Diluted Net Loss Per Share	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	20 . Basic and Diluted Net Loss Per Share The following table sets forth the computation of the Company’s basic and diluted net loss attributable per share to common stockholders for the three and nine months ended September 30, 2019 and 2018 (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Numerator: Net loss attributable to common stockholders $ (13,835 ) $ (7,868 ) $ (68,644 ) $ (2,728 ) Denominator: Shares used in computing net loss attributable per share to common stockholders, basic 121,730 118,767 120,974 116,871 Weighted-average effect of potentially dilutive shares to purchase common stock — — — — Shares used in computing net loss attributable per share to common stockholders, diluted 121,730 118,767 120,974 116,871 Net loss attributable per share to common stockholders: Basic and diluted $ (0.11 ) $ (0.07 ) $ (0.57 ) $ (0.02 ) For all periods presented, the Company incurred net losses attributable to common stockholders. As such, the potentially dilutive shares were anti-dilutive and were not considered in the weighted-average number of common shares outstanding for either period.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with generally accepted accounting principles in the United States (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission (“SEC”) regarding interim financial reporting. Certain information and note disclosures normally included in the financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to such rules and regulations. As such, these unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2018. The unaudited condensed consolidated financial statements were prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments (all of which were considered of normal recurring nature) considered necessary to present fairly the Company’s financial results. The results of the nine months ended September 30, 2019 are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2019 or for any other interim period or other future year. The unaudited condensed consolidated financial statements reflect the accounts and operations of the Company and those of its subsidiaries in which the Company has a controlling financial interest. The Company uses a qualitative approach in assessing the consolidation requirement for VIEs. This approach focuses on determining whether the Company has the power to direct the activities of the VIE that most significantly affect the VIE’s economic performance and whether the Company has the obligation to absorb losses, or the right to receive benefits, that could potentially be significant to the VIE. All of these determinations involve significant management judgments and estimates. The Company has determined that it is the primary beneficiary in the operational VIEs in which it has an equity interest. The Company evaluates its relationships with the VIEs on an ongoing basis to ensure that it continues to be the primary beneficiary. All intercompany transactions and balances have been eliminated in consolidation. For additional information, see Note 14—Investment Funds. Beginning with the first quarter of 2019, the condensed consolidated statements of operations items formerly captioned “Operating leases and incentives” and “Cost of revenue—operating leases and incentives” are now captioned “Customer agreements and incentives” and “Cost of revenue—customer agreements and incentives.” Also beginning with the first quarter of 2019, the condensed consolidated balance sheet items formerly captioned “Current portion of capital lease obligation” and “Capital lease obligation, net of current portion” are now captioned “Current portion of finance lease obligation” and “Finance lease obligation, net of current portion.” Amounts in these balance sheet items were capital leases under Accounting Standards Codification 840: Leases (“Topic 840”) in periods ending prior to January 1, 2019, while amounts in these balance sheet items are finance leases under Accounting Standards Codification 842: Leases (“Topic 842”) in periods ending subsequent to January 1, 2019. See “—Leases” below for further explanation of these changes.
Use of Estimates	Use of Estimates The preparation of the condensed consolidated financial statements requires management to make estimates and assumptions that affect the amounts reported in the condensed consolidated financial statements and accompanying notes. The Company regularly makes significant estimates and assumptions including, but not limited to, ITCs; revenue recognition; solar energy systems, net; the impairment analysis of long-lived assets; stock-based compensation; the provision for income taxes; the valuation of derivative financial instruments; the recognition and measurement of loss contingencies; and non-controlling interests and redeemable non-controlling interests. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results could differ materially from those estimates.
Liquidity	Liquidity In order to grow, the Company requires cash to finance the deployment of solar energy systems. As of the date of this filing, the Company will require additional sources of cash beyond current cash balances and currently available financing facilities to fund long-term planned growth. If the Company is unable to secure additional financing when needed, or upon desirable terms, the Company may be unable to finance installation of customers’ systems in a manner consistent with past performance, cost of capital could increase, or the Company may be required to significantly reduce the scope of operations, any of which would have a material adverse effect on its business, financial condition, results of operations and prospects. While the Company believes additional financing is available and will continue to be available to support current levels of operations, the Company believes it has the ability and intent to reduce operations to the level of available financial resources for at least the next 12 months from the date of this report, if necessary.
Performance Obligation—Solar Energy System and Product Sales	Performance Obligation—Solar Energy system and Product Sales For certain System Sales, the Company provides limited post-sale services to monitor the productivity of the solar energy system for 20 years after it has been placed into service. The Company allocates a portion of the transaction price to the monitoring services by estimating the standalone selling price that the Company would charge for these services if offered separately from the sale of the solar energy system. As of September 30, 2019 and December 31, 2018, the Company had allocated deferred revenue of $4.4 million and $3.3 million to monitoring services that will be recognized over the term of the monitoring services.
Leases	Leases The Company adopted Topic 842 and its subsequent updates effective January 1, 2019. These updates are intended to increase transparency and comparability among organizations by recognizing right-of-use assets and lease liabilities on the condensed consolidated balance sheets and disclosing key information about leasing arrangements. The Company utilized the additional transition method permitted by Accounting Standards Update (“ASU”) 2018-11 and adopted Topic 842 using a modified retrospective method with a cumulative-effect adjustment to its accumulated deficit as of January 1, 2019. As such, comparative periods ending prior to January 1, 2019 are presented in accordance with Topic 840 and periods ending after January 1, 2019 are presented in accordance with Topic 842. The impact to the accumulated deficit as a result of adopting ASU 2016-02 was a net reduction of approximately $0.2 million. The Company did not use the transitionary practical expedients allowed under Topic 842, and as such, the Company reassessed all contracts existing at the adoption date of January 1, 2019. The Company elected to treat leases with lease terms of 12 months or less as short-term leases. No right-of-use assets or lease liabilities are recognized for short-term leases. The Company has also elected not to separate lease components from non-lease components for all classes of leased assets except for building leases. The adoption of this ASU resulted in right-of-use assets of $34.6 million related to operating leases being recognized in other non-current assets, net on the condensed consolidated balance sheets as of January 1, 2019. Corresponding lease liabilities of $43.8 million related to operating leases were recognized on the condensed consolidated balance sheets as of January 1, 2019, with the current portion recognized in accrued and other current liabilities and the long-term portion recognized in other non-current liabilities. In addition, at January 1, 2019, approximately $1.0 million of lease-related liabilities were removed from accrued and other current liabilities and approximately $8.2 million of lease-related liabilities were removed from other non-current liabilities and included as reductions to the initial operating lease right-of-use assets. As of January 1, 2019, finance lease right-of-use assets of $0.9 million continued to be recorded in property and equipment, net. Any changes in lease terms or estimates subsequent to adoption of the ASU 2016-02 are reflected in the right-of-use assets and lease liabilities. The Company’s PPAs, Solar Leases, and associated rebates and incentives no longer meet the definition of a lease under Topic 842. Accordingly, they are accounted for in accordance with Accounting Standards Codification 606: Revenue from Contracts with Customers (“Topic 606”) beginning on January 1, 2019. The Company concluded that there was no change to its revenue recognition practices for its PPA revenue stream under Topic 606. For Solar Leases, the Company concluded that the impact of applying Topic 606 is immaterial. The Company also concluded that there was no material change related to the timing of revenue recognition for rebates and incentives under Topic 606. Upon the adoption of Topic 842, the Company no longer capitalizes initial direct costs and amortizes them to the respective cost of revenue line items. Instead, the Company now capitalizes costs of obtaining a contract which meet the “incremental” criteria defined in Accounting Standards Codification 340 to other non-current assets, net. These costs are now amortized over the period of benefit to sales and marketing expense on the condensed consolidated statements of operations. In accordance with the Company’s Topic 842 transition discussed above, no prior period amounts were changed. For purposes of comparison, the following tables show how the balances as of December 31, 2018 and for the three and nine months ended September 30, 2018 would have changed if the effects of adopting Topic 842 had been applied to those balances (in thousands): December 31, 2018 September 30, 2019 As Reported Adjustments As Adjusted As Reported Solar energy systems, net $ 1,938,874 $ (388,087 ) $ 1,550,787 $ 1,696,129 Other non-current assets, net 28,090 388,087 416,177 567,872 Three Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 42,135 $ (4,625 ) $ 37,510 $ 48,993 Cost of revenue—solar energy system and product sales 17,700 (3,804 ) 13,896 19,444 Total cost of revenue 59,835 (8,429 ) 51,406 68,437 Gross profit 17,981 8,429 26,410 35,412 Sales and marketing 15,841 8,429 24,270 46,121 Total operating expenses 46,261 8,429 54,690 79,391 Nine Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 122,188 $ (13,215 ) $ 108,973 $ 132,258 Cost of revenue—solar energy system and product sales 62,735 (14,058 ) 48,677 52,498 Total cost of revenue 184,923 (27,273 ) 157,650 184,756 Gross profit 41,941 27,273 69,214 79,221 Sales and marketing 40,999 27,273 68,272 112,792 Total operating expenses 114,412 27,273 141,685 201,309
Software Implementation Costs	Software Implementation Costs The Company adopted ASU 2018-15 , Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract, effective January 1, 2019. This update clarifies that entities should capitalize implementation costs incurred in cloud computing arrangements that are service contracts, which the Company will now record within other non-current assets, net. The Company will expense the capitalized costs over the term of the hosting arrangement. The service element of a hosting arrangement that is a service contract is not affected by this update, meaning service costs will continue to be expensed as incurred. The Company is applying the amendments in this update on a prospective basis beginning January 1, 2019. No prior periods were impacted as a result of adopting this ASU.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In June 2016, the Financial Accounting Standards Board issued ASU 2016-13, Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. the Company’s accounts receivable and certain contract assets are considered financial assets measured at an amortized cost basis and will need to be presented at the net amount expected to be collected. This ASU will be effective for the Company beginning on January 1, 2020 and will be applied through a modified retrospective approach with a cumulative-effect adjustment to retained earnings as of the first reporting period in which the guidance is effective. The Company is still evaluating the impact of this update on its condensed consolidated financial statements and related disclosures but currently anticipates that the impact will not be significant.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2019
Accounting Policies [Abstract]
Summary of Comparison on Effects of Adopting Topic 842	For purposes of comparison, the following tables show how the balances as of December 31, 2018 and for the three and nine months ended September 30, 2018 would have changed if the effects of adopting Topic 842 had been applied to those balances (in thousands): December 31, 2018 September 30, 2019 As Reported Adjustments As Adjusted As Reported Solar energy systems, net $ 1,938,874 $ (388,087 ) $ 1,550,787 $ 1,696,129 Other non-current assets, net 28,090 388,087 416,177 567,872 Three Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 42,135 $ (4,625 ) $ 37,510 $ 48,993 Cost of revenue—solar energy system and product sales 17,700 (3,804 ) 13,896 19,444 Total cost of revenue 59,835 (8,429 ) 51,406 68,437 Gross profit 17,981 8,429 26,410 35,412 Sales and marketing 15,841 8,429 24,270 46,121 Total operating expenses 46,261 8,429 54,690 79,391 Nine Months Ended September 30, 2018 2019 As Reported Adjustments As Adjusted As Reported Cost of revenue—customer agreements and incentives $ 122,188 $ (13,215 ) $ 108,973 $ 132,258 Cost of revenue—solar energy system and product sales 62,735 (14,058 ) 48,677 52,498 Total cost of revenue 184,923 (27,273 ) 157,650 184,756 Gross profit 41,941 27,273 69,214 79,221 Sales and marketing 40,999 27,273 68,272 112,792 Total operating expenses 114,412 27,273 141,685 201,309

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2019
Fair Value Disclosures [Abstract]
Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis	The Company measures and reports its cash equivalents at fair value. The following tables set forth the fair value of the Company’s financial assets and liabilities included on the condensed consolidated balance sheets measured on a recurring basis by level within the fair value hierarchy (in thousands): September 30, 2019 Level 1 Level 2 Level 3 Total Financial Liabilities Interest rate swaps $ — $ 35,301 $ — $ 35,301 December 31, 2018 Level 1 Level 2 Level 3 Total Financial Assets Interest rate swaps $ — $ 130 $ — $ 130 Financial Liabilities Interest rate swaps $ — $ 11,146 $ — $ 11,146
Schedule of Carrying Values and Fair Values of Company's Long-term Debt	The carrying values and fair values of the Company’s long-term debt were as follows (in thousands): September 30, 2019 December 31, 2018 Carrying Value Fair Value Carrying Value Fair Value Floating-rate long-term debt $ 814,795 $ 814,795 $ 587,358 $ 587,358 Fixed-rate long-term debt 638,486 705,100 653,031 673,917 Total $ 1,453,281 $ 1,519,895 $ 1,240,389 $ 1,261,275

Inventories (Tables)

Inventories (Tables)	9 Months Ended
	Sep. 30, 2019
Inventory Disclosure [Abstract]
Summary of Inventories	Inventories consisted of the following (in thousands): September 30, December 31, 2019 2018 Solar energy systems held for sale $ 12,925 $ 12,321 Photovoltaic installation products 802 936 Total inventories $ 13,727 $ 13,257

Solar Energy Systems (Tables)

Solar Energy Systems (Tables)	9 Months Ended
	Sep. 30, 2019
Solar Energy Systems Disclosure [Abstract]
Solar Energy Systems	Solar energy systems, net consisted of the following (in thousands): September 30, December 31, 2019 2018 System equipment costs $ 1,856,664 $ 1,667,440 Initial direct costs related to solar energy systems — 435,084 1,856,664 2,102,524 Less: Accumulated depreciation (190,224 ) (195,890 ) 1,666,440 1,906,634 Solar energy system inventory 29,689 32,240 Solar energy systems, net $ 1,696,129 $ 1,938,874

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2019
Property Plant And Equipment [Abstract]
Summary of Property and Equipment Net	Property and equipment, net consisted of the following (in thousands): Estimated September 30, December 31, Useful Lives 2019 2018 Leasehold improvements 1-12 years $ 10,486 $ 10,560 Furniture and computer and other equipment 3 years 4,282 3,816 Vehicles acquired under finance leases 3-5 years 7,106 6,907 21,874 21,283 Less: Accumulated depreciation and amortization (7,542 ) (10,553 ) Property and equipment, net $ 14,332 $ 10,730

Other Non-Current Assets (Table

Other Non-Current Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Other Assets Noncurrent Disclosure [Abstract]
Schedule of Other Non-Current Assets	Other non-current assets consisted of the following (in thousands): September 30, December 31, 2019 2018 Costs to obtain contracts $ 559,492 $ — Accumulated amortization of costs to obtain contracts (65,204 ) — Operating lease right-of-use assets 38,292 — Sales incentives 10,006 8,588 Other non-current assets 25,286 19,502 Total other non-current assets $ 567,872 $ 28,090

Intangible Assets (Tables)

Intangible Assets (Tables)	9 Months Ended
	Sep. 30, 2019
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Net Intangible Assets Included in Other Non Current assets , Net	Net intangible assets are included in other non-current assets, net and consisted of the following (in thousands): September 30, December 31, 2019 2018 Cost: Internal-use software $ 1,312 $ 1,020 Developed technology 522 522 Trademarks/trade names 201 201 Total carrying value 2,035 1,743 Accumulated amortization: Internal-use software (87 ) (781 ) Developed technology (376 ) (324 ) Trademarks/trade names (114 ) (99 ) Total accumulated amortization (577 ) (1,204 ) Total intangible assets, net $ 1,458 $ 539

Accrued Compensation (Tables)

Accrued Compensation (Tables)	9 Months Ended
	Sep. 30, 2019
Accrued Compensation Disclosure [Abstract]
Summary of Accrued Compensation	Accrued compensation consisted of the following (in thousands): September 30, December 31, 2019 2018 Accrued payroll $ 19,052 $ 16,352 Accrued commissions 21,595 9,168 Total accrued compensation $ 40,647 $ 25,520

Accrued and Other Current Lia_2

Accrued and Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2019
Payables And Accruals [Abstract]
Schedule of Accrued and Other Current Liabilities	Accrued and other current liabilities consisted of the following (in thousands): September 30, December 31, 2019 2018 Accrued unused commitment fees and interest $ 16,151 $ 14,102 Litigation Settlement 8,325 100 Accrued inventory 7,567 4,380 Current portion of operating lease liabilities 7,432 — Accrued professional fees 6,233 6,150 Accrued workers' compensation 6,024 4,033 Current portion of lease pass-through financing obligation 5,126 5,038 Workmanship accrual 3,724 2,630 Sales, use and property taxes payable 3,393 3,132 Other accrued expenses 6,263 3,295 Total accrued and other current liabilities $ 70,238 $ 42,860

Debt Obligations (Tables)

Debt Obligations (Tables)	9 Months Ended
	Sep. 30, 2019
Debt Disclosure [Abstract]
Schedule of Debt	Debt obligations consisted of the following as of September 30, 2019 (in thousands, except interest rates): Principal Unamortized Debt Unused Borrowings Issuance Costs Net Carrying Value Borrowing Interest Maturity Outstanding Current Long-term Current Long-term Capacity Rate Date Solar asset backed notes, Series 2018-1 (1) $ 454,100 $ (76 ) $ (8,603 ) $ 3,919 $ 441,502 $ — 5.1 % October 2028 Solar asset backed notes, Series 2018-2 (2)(3) 338,294 (5 ) (6,457 ) 245 331,587 — 5.5 August 2023 2017 Term loan facility 183,116 (173 ) (4,326 ) 6,855 171,762 — 6.0 January 2035 2018 Forward flow loan facility 125,048 (94 ) (3,145 ) 2,396 119,413 — 4.7 (4) 2019 Forward flow loan facility 50,353 — (2,902 ) — 47,451 99,647 3.9 (5) Credit agreement 1,270 (1 ) (99 ) 17 1,153 — 6.5 February 2023 Revolving lines of credit ( 6) Warehouse facility 170,000 — — — 170,000 155,000 4.7 August 2023 Working capital facility ( 7) 131,100 — — 131,100 — — 5.4 March 2020 Total debt $ 1,453,281 $ (349 ) $ (25,532 ) $ 144,532 $ 1,282,868 $ 254,647 Debt obligations consisted of the following as of December 31, 2018 (in thousands, except interest rates): Principal Unamortized Debt Unused Borrowings Issuance Costs Net Carrying Value Borrowing Interest Maturity Outstanding Current Long-term Current Long-term Capacity Rate Date Solar asset backed notes, Series 2018-1 (1) $ 462,826 $ (74 ) $ (9,172 ) $ 3,655 $ 449,925 $ — 5.1 % October 2028 Solar asset backed notes, Series 2018-2 (2)(3) 342,833 (6 ) (7,388 ) 294 335,145 — 5.4 August 2023 2017 Term loan facility 188,922 (170 ) (4,614 ) 6,679 177,459 — 6.0 January 2035 2018 Forward flow loan facility 58,425 (43 ) (3,365 ) 1,512 53,505 71,575 5.2 (4) Credit agreement 1,283 (2 ) (118 ) 15 1,148 — 6.5 February 2023 Revolving lines of credit ( 6) Aggregation facility 50,000 — — — 50,000 325,000 5.7 September 2020 Working capital facility ( 7) 136,100 — — — 136,100 — 5.6 March 2020 Total debt $ 1,240,389 $ (295 ) $ (24,657 ) $ 12,155 $ 1,203,282 $ 396,575 (1) The interest rate disclosed in the table above is a weighted-average rate. The Series 2018-1 Notes are comprised of Class A and Class B Notes. Class A Notes accrue interest at 4.73%. Class B Notes accrue interest at 7.37%. (2) The Series 2018-2 Notes are comprised of Class A and Class B Notes. Class B Notes accrue interest at a rate of LIBOR plus 4.75%. Class A Notes accrue interest at a variable spread over LIBOR that results in a weighted average spread for all 2018-2 Notes of 2.95%. (3) The interest rate of these notes is partially hedged to an effective interest rate of 6.0% for $323.6 million of the principal borrowings. See Note 13—Derivative Financial Instruments. (4) The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than October 31, 2019. (5) The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than November 20, 2020. (6) Revolving lines of credit are not presented net of unamortized debt issuance costs. ( 7 ) This facility is recourse debt, which refers to debt that is collateralized by the Company’s general assets. All of the Company’s other debt obligations are non-recourse, which refers to debt that is only collateralized by specified assets or subsidiaries of the Company.

Leases (Tables)

Leases (Tables)	9 Months Ended
	Sep. 30, 2019
Lessee Disclosure [Abstract]
Summary of Lease Costs and Other Information	Lease costs and other information consisted of the following (in thousands, except terms and rates): Three Months Ended Nine Months Ended September 30, 2019 September 30, 2019 Lease cost Finance lease cost: Amortization of right-of-use assets $ 465 $ 1,125 Interest on lease liabilities 96 180 Operating lease cost 2,818 8,358 Short-term lease cost 413 1,714 Total lease cost $ 3,792 $ 11,377 Other information Finance leases: Operating cash outflows from finance leases $ 96 $ 180 Financing cash outflows from finance leases $ 377 $ 954 Right-of-use assets obtained in exchange for new finance lease liabilities $ 2,321 $ 6,077 Weighted-average remaining lease term - finance leases (in years) 3.6 3.6 Weighted-average discount rate - finance leases 7.4 % 7.4 % Operating leases: Operating cash outflows from operating leases $ 2,870 $ 8,505 Right-of-use assets obtained in exchange for new operating lease liabilities $ 545 $ 9,210 Weighted-average remaining lease term - operating leases (in years) 9.3 9.3 Weighted-average discount rate - operating leases 8.0 % 8.0 %
Schedule of Future Minimum Lease Payments for Finance Leases	Future minimum lease payments for the Company’s finance leases as of September 30, 2019 were as follows (in thousands): 2019 $ 511 2020 1,839 2021 1,815 2022 1,689 2023 769 Thereafter — Total minimum lease payments 6,623 Less: interest 786 Present value of finance lease obligations 5,837 Less: current portion 1,529 Long-term portion $ 4,308
Schedule of Future Minimum Lease Payments Under Non-cancellable Operating Leases	Future minimum lease payments under non-cancellable operating leases as of September 30, 2019 were as follows (in thousands): 2019 $ 2,845 2020 10,466 2021 8,090 2022 5,815 2023 4,780 Thereafter 36,680 Total minimum lease payments 68,676 Less: present value impact 21,360 Present value of operating lease obligations 47,316 Less: current portion 7,432 Long-term portion $ 39,884

Derivative Financial Instrume_2

Derivative Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2019
Derivative Instruments And Hedging Activities Disclosure [Abstract]
Schedule of Derivative Financial Instruments at Fair Value	Derivative financial instruments at fair value consisted of the following (in thousands): September 30, 2019 Fair Value Balance Sheet Location Derivatives designated as hedging instruments: Interest rate swaps $ 33,323 Other non-current liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,978 Other non-current liabilities December 31, 2018 Fair Value Balance Sheet Location Derivatives designated as hedging instruments: Interest rate swaps $ 9,884 Other non-current liabilities Derivatives not designated as hedging instruments: Interest rate swaps $ 1,262 Other non-current liabilities Interest rate swaps $ 130 Other non-current assets
Schedule of Losses (Gains) on Derivative Financial Instruments Recognized in OCI and Condensed Consolidated Statements of Operations Before Tax Effect	The Company records derivatives at fair value. The losses (gains) on derivatives designated as cash flow hedges recognized in OCI, before tax effect, consisted of the following (in thousands): Three Months Ended September 30, 2019 2018 Derivatives designated as cash flow hedges: Interest rate swaps $ 7,889 $ (3,966 ) Nine Months Ended September 30, 2019 2018 Derivatives designated as cash flow hedges: Interest rate swaps $ 24,516 $ (8,284 ) The losses (gains) on derivative financial instruments recognized in the condensed consolidated statements of operations, before tax effect, consisted of the following (in thousands): Three Months Ended September 30, 2019 2018 Interest expense, net Other expense (income), net Interest expense, net Other expense (income), net Total amounts presented in the income statement line items $ 22,804 $ 3,907 $ 18,715 $ (1 ) Derivatives designated as cash flow hedges: Interest rate swaps Losses reclassified from AOCI into income $ 517 $ — $ 535 $ — Derivatives not designated as hedging instruments: Interest rate swaps Losses recognized in income — 3,906 — — Total losses $ 517 $ 3,906 $ 535 $ — Nine Months Ended September 30, 2019 2018 Interest expense, net Other expense (income), net Interest expense, net Other expense (income), net Total amounts presented in the income statement line items $ 61,403 $ 6,657 $ 46,973 $ (6,371 ) Derivatives designated as cash flow hedges: Interest rate swaps Losses (gains) reclassified from AOCI into income $ 1,077 $ — $ (22,181 ) $ — Derivatives not designated as hedging instruments: Interest rate swaps Losses (gains) recognized in income — 6,656 — (4,252 ) Total losses (gains) $ 1,077 $ 6,656 $ (22,181 ) $ (4,252 )

Investment Funds (Tables)

Investment Funds (Tables)	9 Months Ended
	Sep. 30, 2019
Schedule Of Investments [Abstract]
Aggregate Carrying Value of Funds Assets and Liabilities	The Company has formed investment funds for the purpose of funding the purchase of solar energy systems under long-term customer contracts. As of September 30, 2019 and December 31, 2018, the aggregate carrying value of these funds’ assets and liabilities (after elimination of intercompany transactions and balances) in the Company’s condensed consolidated balance sheets were as follows (in thousands): September 30, December 31, 2019 2018 Assets Current assets: Cash and cash equivalents $ 103,921 $ 62,350 Accounts receivable, net 17,385 6,593 Prepaid expenses and other current assets 2,384 1,289 Total current assets 123,690 70,232 Restricted cash and cash equivalents 8,361 2,443 Solar energy systems, net 1,541,344 1,752,271 Other non-current assets, net 459,771 10,888 Total assets $ 2,133,166 $ 1,835,834 Liabilities Current liabilities: Distributions payable to non-controlling interests and redeemable non-controlling interests $ 17,328 $ 7,846 Current portion of long-term debt 2,396 1,512 Current portion of deferred revenue 2,272 2,320 Accrued and other current liabilities 6,027 4,860 Total current liabilities 28,023 16,538 Long-term debt, net of current portion 166,864 53,505 Deferred revenue, net of current portion 11,484 9,694 Other non-current liabilities 375 1,023 Total liabilities $ 206,746 $ 80,760

Redeemable Non-Controlling In_2

Redeemable Non-Controlling Interests and Equity (Tables)	9 Months Ended
	Sep. 30, 2019
Noncontrolling Interest [Abstract]
Schedule of Shares of Common Stock Reserved for Issuance	The Company had shares of common stock reserved for issuance as follows (in thousands): September 30, December 31, 2019 2018 Shares available for grant under equity incentive plans 13,340 13,323 Restricted stock units issued and outstanding 6,791 6,172 Stock options issued and outstanding 5,588 3,394 Long-term incentive plan 2,706 2,706 Total 28,425 25,595

Equity Compensation Plans (Tabl

Equity Compensation Plans (Tables)	9 Months Ended
	Sep. 30, 2019
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Summary of Stock Option Activity	Stock option activity for the nine months ended September 30, 2019 was as follows (in thousands, except term and per share amounts): Weighted- Weighted- Average Shares Average Remaining Aggregate Underlying Exercise Contractual Intrinsic Options Price Term (in years) Value Outstanding—December 31, 2018 3,394 $ 2.77 $ 4,689 Granted 2,379 5.33 Exercised (139 ) 2.18 Cancelled (46 ) 6.65 Outstanding—September 30, 2019 5,588 $ 3.84 7.7 $ 15,834 Options vested and exercisable—September 30, 2019 2,312 $ 2.44 5.6 $ 9,963
RSU Activity	RSU activity for the nine months ended September 30, 2019 was as follows (awards in thousands): Weighted- Average Number of Grant Date Awards Fair Value Outstanding at December 31, 2018 6,172 $ 3.84 Granted 2,926 5.89 Vested (1,834 ) 3.86 Forfeited (473 ) 4.28 Outstanding at September 30, 2019 6,791 $ 4.68
Summary of Stock-Based Compensation Expense	Stock-based compensation was included in operating expenses as follows (in thousands): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Cost of revenue $ 467 $ 361 $ 1,203 $ 984 Sales and marketing 756 754 2,297 2,668 General and administrative 2,891 1,956 8,390 6,125 Research and development 36 32 95 107 Total stock-based compensation $ 4,150 $ 3,103 $ 11,985 $ 9,884
Summary of Unrecognized Stock-Based Compensation Expense	Unrecognized stock-based compensation expense for RSUs and stock options as of September 30, 2019 was as follows (in thousands, except years): Unrecognized Weighted- Stock-Based Average Period Compensation of Recognition Expense (in years) RSUs $ 21,414 1.8 Stock options 6,987 2.1 Total unrecognized stock-based compensation expense $ 28,401

Basic and Diluted Net Loss Pe_2

Basic and Diluted Net Loss Per Share (Tables)	9 Months Ended
	Sep. 30, 2019
Earnings Per Share [Abstract]
Computation of Basic and Diluted Net Loss Per Share to Common Stockholders	The following table sets forth the computation of the Company’s basic and diluted net loss attributable per share to common stockholders for the three and nine months ended September 30, 2019 and 2018 (in thousands, except per share amounts): Three Months Ended Nine Months Ended September 30, September 30, 2019 2018 2019 2018 Numerator: Net loss attributable to common stockholders $ (13,835 ) $ (7,868 ) $ (68,644 ) $ (2,728 ) Denominator: Shares used in computing net loss attributable per share to common stockholders, basic 121,730 118,767 120,974 116,871 Weighted-average effect of potentially dilutive shares to purchase common stock — — — — Shares used in computing net loss attributable per share to common stockholders, diluted 121,730 118,767 120,974 116,871 Net loss attributable per share to common stockholders: Basic and diluted $ (0.11 ) $ (0.07 ) $ (0.57 ) $ (0.02 )

Organization - Additional Infor

Organization - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Contractual term of customers	20 years

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Additional Information (Details) - USD ($) $ in Thousands	Jan. 01, 2019	Sep. 30, 2019	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Operating leases right-of-use assets		$ 38,292
Operating leases lease liabilities		47,316
Operating leases liabilities removed from current liabilities	$ 1,000
Monitoring Services
Summary Of Significant Accounting Policies [Line Items]
Deferred revenue		$ 4,400	$ 3,300
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	200
Short term leases right of use asset	0
Short term lease liability	0
Operating leases right-of-use assets	34,600
Operating leases lease liabilities	43,800
Operating leases liabilities removed from non current liabilities	8,200
Finance lease right-of-use assets	$ 900

Summary of Significant Accoun_5

Summary of Significant Accounting Policies - Summary of Comparison on Effects of Adopting Topic 842 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Summary Of Significant Accounting Policies [Line Items]
Solar energy systems, net	$ 1,696,129		$ 1,696,129		$ 1,938,874
Other non-current assets, net	567,872		567,872		28,090
Total cost of revenue	68,437	$ 59,835	184,756	$ 184,923
Gross profit	35,412	17,981	79,221	41,941
Sales and marketing	46,121	15,841	112,792	40,999
Total operating expenses	79,391	46,261	201,309	114,412
Customer Agreements and Incentives
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue	48,993	42,135	132,258	122,188
Solar Energy System and Product Sales
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue	$ 19,444	17,700	$ 52,498	62,735
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Solar energy systems, net					1,550,787
Other non-current assets, net					416,177
Total cost of revenue		51,406		157,650
Gross profit		26,410		69,214
Sales and marketing		24,270		68,272
Total operating expenses		54,690		141,685
ASU 2016-02 | Customer Agreements and Incentives
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue		37,510		108,973
ASU 2016-02 | Solar Energy System and Product Sales
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue		13,896		48,677
Adjustments | ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Solar energy systems, net					(388,087)
Other non-current assets, net					$ 388,087
Total cost of revenue		(8,429)		(27,273)
Gross profit		8,429		27,273
Sales and marketing		8,429		27,273
Total operating expenses		8,429		27,273
Adjustments | ASU 2016-02 | Customer Agreements and Incentives
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue		(4,625)		(13,215)
Adjustments | ASU 2016-02 | Solar Energy System and Product Sales
Summary Of Significant Accounting Policies [Line Items]
Total cost of revenue		$ (3,804)		$ (14,058)

Fair Value Measurements - Sched

Fair Value Measurements - Schedule of Fair Value of Financial Assets and Liabilities Measured on Recurring Basis (Details) - Interest Rate Swaps - Fair Value Measurements, Recurring Basis - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities	$ 35,301	$ 11,146
Financial Assets		130
Level 2
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Financial Liabilities	$ 35,301	11,146
Financial Assets		$ 130

Fair Value Measurements - Sch_2

Fair Value Measurements - Schedule of Carrying Values and Fair Values of Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Carrying Value	$ 1,453,281	$ 1,240,389
Long-term debt, Fair Value	1,519,895	1,261,275
Floating-rate Long-term Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Carrying Value	814,795	587,358
Long-term debt, Fair Value	814,795	587,358
Fixed-rate Long-term Debt
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Long-term debt, Carrying Value	638,486	653,031
Long-term debt, Fair Value	$ 705,100	$ 673,917

Inventories - Summary of Invent

Inventories - Summary of Inventories (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Inventory Disclosure [Abstract]
Solar energy systems held for sale	$ 12,925	$ 12,321
Photovoltaic installation products	802	936
Total inventories	$ 13,727	$ 13,257

Solar Energy Systems (Details)

Solar Energy Systems (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Capitalized Costs of Equipment Installed Under Customer Agreements [Line Items]
Solar energy systems, gross	$ 1,856,664	$ 2,102,524
Less: Accumulated depreciation	(190,224)	(195,890)
Solar energy systems, net excluding inventory	1,666,440	1,906,634
Solar energy system inventory	29,689	32,240
Solar energy systems, net	1,696,129	1,938,874
System Equipment Costs
Capitalized Costs of Equipment Installed Under Customer Agreements [Line Items]
Solar energy systems, gross	$ 1,856,664	1,667,440
Initial Direct Costs Related to Solar Energy Systems
Capitalized Costs of Equipment Installed Under Customer Agreements [Line Items]
Solar energy systems, gross		$ 435,084

Solar Energy Systems - Addition

Solar Energy Systems - Additional Information (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Solar Energy System Inventory
Capitalized Costs of Equipment Installed Under Customer Agreements [Line Items]
Depreciation			$ 0
Solar Energy Systems
Capitalized Costs of Equipment Installed Under Customer Agreements [Line Items]
Depreciation	$ 14,400,000	$ 17,000,000	$ 41,300,000	$ 48,500,000

Property and Equipment - Summar

Property and Equipment - Summary of Property and Equipment Net (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property, gross	$ 21,874	$ 21,283
Less: Accumulated depreciation and amortization	(7,542)	(10,553)
Property and equipment, net	14,332	10,730
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property, gross	$ 10,486	10,560
Furniture and Computer and Other Equipment
Property Plant And Equipment [Line Items]
Property and Equipment, Estimated Useful Lives	3 years
Property, gross	$ 4,282	3,816
Vehicles Acquired Under Finance Leases
Property Plant And Equipment [Line Items]
Property, gross	$ 7,106	$ 6,907
Minimum | Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and Equipment, Estimated Useful Lives	1 year
Minimum | Vehicles Acquired Under Finance Leases
Property Plant And Equipment [Line Items]
Property and Equipment, Estimated Useful Lives	3 years
Maximum | Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and Equipment, Estimated Useful Lives	12 years
Maximum | Vehicles Acquired Under Finance Leases
Property Plant And Equipment [Line Items]
Property and Equipment, Estimated Useful Lives	5 years

Property and Equipment - Additi

Property and Equipment - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Property Plant And Equipment [Line Items]
Depreciation and amortization expense			$ 61,243	$ 51,247
Property and equipment
Property Plant And Equipment [Line Items]
Depreciation and amortization expense	$ 800	$ 900	$ 1,800	$ 3,900

Other Non-Current Assets - Sche

Other Non-Current Assets - Schedule of Other Non-Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Assets Noncurrent [Abstract]
Costs to obtain contracts	$ 559,492
Accumulated amortization of costs to obtain contracts	(65,204)
Operating lease right-of-use assets	38,292
Sales incentives	10,006	$ 8,588
Other non-current assets	25,286	19,502
Total other non-current assets	$ 567,872	$ 28,090

Other Non-Current Assets - Addi

Other Non-Current Assets - Additional Information (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019USD ($)	Sep. 30, 2019USD ($)
Other Assets Noncurrent [Abstract]
Amortization of costs to obtain contracts	$ 6.9	$ 18.2
Cost to obtain contracts amortized term	20 years	20 years

Intangible Assets - Summary of

Intangible Assets - Summary of Net Intangible Assets Included in Other Non Current Assets, Net (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Intangible assets, carrying value	$ 2,035	$ 1,743
Intangible assets, accumulated amortization	(577)	(1,204)
Total intangible assets, net	1,458	539
Internal-use software
Finite Lived Intangible Assets [Line Items]
Intangible assets, carrying value	1,312	1,020
Intangible assets, accumulated amortization	(87)	(781)
Developed Technology
Finite Lived Intangible Assets [Line Items]
Intangible assets, carrying value	522	522
Intangible assets, accumulated amortization	(376)	(324)
Trademarks/Trade Names
Finite Lived Intangible Assets [Line Items]
Intangible assets, carrying value	201	201
Intangible assets, accumulated amortization	$ (114)	$ (99)

Intangible Assets - Additional

Intangible Assets - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Goodwill And Intangible Assets Disclosure [Abstract]
Amortization of intangible assets	$ 0.1	$ 0.2	$ 0.4

Accrued Compensation - Summary

Accrued Compensation - Summary of Accrued Compensation (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Accrued Compensation Disclosure [Abstract]
Accrued payroll	$ 19,052	$ 16,352
Accrued commissions	21,595	9,168
Total accrued compensation	$ 40,647	$ 25,520

Accrued and Other Current Lia_3

Accrued and Other Current Liabilities - Schedule of Accrued and Other Current Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Payables And Accruals [Abstract]
Accrued unused commitment fees and interest	$ 16,151	$ 14,102
Litigation Settlement	8,325	100
Accrued inventory	7,567	4,380
Current portion of operating lease liabilities	7,432
Accrued professional fees	6,233	6,150
Accrued workers' compensation	6,024	4,033
Current portion of lease pass-through financing obligation	5,126	5,038
Workmanship accrual	3,724	2,630
Sales, use and property taxes payable	3,393	3,132
Other accrued expenses	6,263	3,295
Total accrued and other current liabilities	$ 70,238	$ 42,860

Debt Obligations - Schedule of

Debt Obligations - Schedule of Debt Obligations (Details) - USD ($) $ in Thousands		1 Months Ended	9 Months Ended		12 Months Ended
		Jun. 30, 2018	Sep. 30, 2019		Dec. 31, 2018		Aug. 31, 2019
Debt Instrument [Line Items]
Principal Borrowings Outstanding			$ 1,453,281		$ 1,240,389
Unamortized Debt Issuance Costs, Current			(349)		(295)
Unamortized Debt Issuance Costs, Long-term			(25,532)		(24,657)
Current portion of long-term debt			144,532		12,155
Long-term debt, net of current portion			1,282,868		1,203,282
Unused Borrowing Capacity			254,647		396,575
Solar Asset Backed Notes, Series 2018-1
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[1]		454,100		462,826
Unamortized Debt Issuance Costs, Current	[1]		(76)		(74)
Unamortized Debt Issuance Costs, Long-term	[1]		(8,603)		(9,172)
Current portion of long-term debt	[1]		3,919		3,655
Long-term debt, net of current portion	[1]		$ 441,502		$ 449,925
Interest Rate	[1]		5.10%		5.10%
Maturity Date	[1]		Oct. 31, 2028		Oct. 31, 2028
2017 Term Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding			$ 183,116		$ 188,922
Unamortized Debt Issuance Costs, Current			(173)		(170)
Unamortized Debt Issuance Costs, Long-term			(4,326)		(4,614)
Current portion of long-term debt			6,855		6,679
Long-term debt, net of current portion			$ 171,762		$ 177,459
Interest Rate			6.00%		6.00%
Maturity Date			Jan. 31, 2035		Jan. 31, 2035
Solar Asset Backed Notes, Series 2018-2
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[2],[3]		$ 338,294		$ 342,833
Unamortized Debt Issuance Costs, Current	[2],[3]		(5)		(6)
Unamortized Debt Issuance Costs, Long-term	[2],[3]		(6,457)		(7,388)
Current portion of long-term debt	[2],[3]		245		294
Long-term debt, net of current portion	[2],[3]		$ 331,587		$ 335,145
Interest Rate	[2],[3]		5.50%		5.40%
Maturity Date		Aug. 29, 2023	Aug. 31, 2023	[2],[3]	Aug. 31, 2023	[2],[3]
2018 Forward Flow Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[4]		$ 125,048		$ 58,425
Unamortized Debt Issuance Costs, Current	[4]		(94)		(43)
Unamortized Debt Issuance Costs, Long-term	[4]		(3,145)		(3,365)
Current portion of long-term debt	[4]		2,396		1,512
Long-term debt, net of current portion	[4]		$ 119,413		53,505
Unused Borrowing Capacity	[4]				$ 71,575
Interest Rate	[4]		4.70%		5.20%
2019 Forward Flow Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[5]		$ 50,353
Unamortized Debt Issuance Costs, Long-term	[5]		(2,902)
Long-term debt, net of current portion	[5]		47,451
Unused Borrowing Capacity	[5]		$ 99,647
Interest Rate	[5]		3.90%
Credit Agreement
Debt Instrument [Line Items]
Principal Borrowings Outstanding			$ 1,270		$ 1,283
Unamortized Debt Issuance Costs, Current			(1)		(2)
Unamortized Debt Issuance Costs, Long-term			(99)		(118)
Current portion of long-term debt			17		15
Long-term debt, net of current portion			$ 1,153		$ 1,148
Interest Rate			6.50%		6.50%
Maturity Date			Feb. 28, 2023		Feb. 28, 2023
Revolving Warehouse Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding			$ 170,000
Long-term debt, net of current portion			170,000
Unused Borrowing Capacity			$ 155,000
Interest Rate			4.70%
Maturity Date			Aug. 31, 2023
Aggregation Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[6]				$ 50,000
Unamortized Debt Issuance Costs, Long-term							$ (3,600)
Long-term debt, net of current portion	[6]				50,000
Unused Borrowing Capacity	[6]				$ 325,000
Interest Rate	[6]				5.70%
Maturity Date	[6]				Sep. 30, 2020
Working Capital Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[6],[7]		$ 131,100		$ 136,100
Current portion of long-term debt	[6],[7]		$ 131,100
Long-term debt, net of current portion	[6],[7]				$ 136,100
Interest Rate	[6],[7]		5.40%		5.60%
Maturity Date	[6],[7]		Mar. 31, 2020		Mar. 31, 2020
[1]	The interest rate disclosed in the table above is a weighted-average rate. The Series 2018-1 Notes are comprised of Class A and Class B Notes. Class A Notes accrue interest at 4.73%. Class B Notes accrue interest at 7.37%.
[2]	The Series 2018-2 Notes are comprised of Class A and Class B Notes. Class B Notes accrue interest at a rate of LIBOR plus 4.75%. Class A Notes accrue interest at a variable spread over LIBOR that results in a weighted average spread for all 2018-2 Notes of 2.95%.
[3]	The interest rate of these notes is partially hedged to an effective interest rate of 6.0% for $323.6 million of the principal borrowings. See Note 13—Derivative Financial Instruments.
[4]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than October 31, 2019.
[5]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than November 20, 2020.
[6]	Revolving lines of credit are not presented net of unamortized debt issuance costs.
[7]	This facility is recourse debt, which refers to debt that is collateralized by the Company’s general assets. All of the Company’s other debt obligations are non-recourse, which refers to debt that is only collateralized by specified assets or subsidiaries of the Company.

Debt Obligations - Schedule o_2

Debt Obligations - Schedule of Debt Obligations (Parenthetical) (Details) - USD ($)		1 Months Ended			9 Months Ended		12 Months Ended
		May 31, 2019	Aug. 31, 2018	Jun. 30, 2018	Sep. 30, 2019		Dec. 31, 2018
Debt Instrument [Line Items]
Principal borrowings outstanding					$ 1,453,281,000		$ 1,240,389,000
Solar Asset Backed Notes, Series 2018-1
Debt Instrument [Line Items]
Interest Rate	[1]				5.10%		5.10%
Principal borrowings outstanding	[1]				$ 454,100,000		$ 462,826,000
Maturity Date	[1]				Oct. 31, 2028		Oct. 31, 2028
Solar Asset Backed Notes, Series 2018-1 | Class A Notes
Debt Instrument [Line Items]
Interest Rate				4.73%	4.73%
Principal borrowings outstanding				$ 400,000,000
Maturity Date				Oct. 30, 2028
Solar Asset Backed Notes, Series 2018-1 | Class B Notes
Debt Instrument [Line Items]
Interest Rate				7.37%	7.37%
Principal borrowings outstanding				$ 66,000,000
Maturity Date				Oct. 30, 2028
Solar Asset Backed Notes, Series 2018-2
Debt Instrument [Line Items]
Interest Rate	[2],[3]				5.50%		5.40%
Principal borrowings outstanding	[2],[3]				$ 338,294,000		$ 342,833,000
Maturity Date				Aug. 29, 2023	Aug. 31, 2023	[2],[3]	Aug. 31, 2023	[2],[3]
Solar Asset Backed Notes, Series 2018-2 | Interest Rate Swaps
Debt Instrument [Line Items]
Effective interest rate of principal borrowings				5.95%	6.00%
Principal borrowings outstanding					$ 323,600,000
Solar Asset Backed Notes, Series 2018-2 | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate				2.95%
Solar Asset Backed Notes, Series 2018-2 | Class A Notes
Debt Instrument [Line Items]
Principal borrowings outstanding				$ 296,000,000
Solar Asset Backed Notes, Series 2018-2 | Class A Notes | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate				2.95%	2.95%
Solar Asset Backed Notes, Series 2018-2 | Class B Notes
Debt Instrument [Line Items]
Principal borrowings outstanding				$ 49,000,000
Solar Asset Backed Notes, Series 2018-2 | Class B Notes | L I B O R Plus
Debt Instrument [Line Items]
Debt instrument interest rate					4.75%
Solar Asset Backed Notes, Series 2018-2 | Class B Notes | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate				4.75%
2018 Forward Flow Loan Facility
Debt Instrument [Line Items]
Interest Rate	[4]				4.70%		5.20%
Debt instrument interest rate			1.50%
Principal borrowings outstanding	[4]				$ 125,048,000		$ 58,425,000
Debt instrument maturity period			20 years		20 years
2018 Forward Flow Loan Facility | Maximum
Debt Instrument [Line Items]
Maturity Date					Oct. 31, 2019
2019 Forward Flow Loan Facility
Debt Instrument [Line Items]
Interest Rate	[5]				3.90%
Principal borrowings outstanding	[5]				$ 50,353,000
Debt instrument maturity period		20 years			20 years
2019 Forward Flow Loan Facility | Maximum
Debt Instrument [Line Items]
Maturity Date					Nov. 20, 2020
[1]	The interest rate disclosed in the table above is a weighted-average rate. The Series 2018-1 Notes are comprised of Class A and Class B Notes. Class A Notes accrue interest at 4.73%. Class B Notes accrue interest at 7.37%.
[2]	The Series 2018-2 Notes are comprised of Class A and Class B Notes. Class B Notes accrue interest at a rate of LIBOR plus 4.75%. Class A Notes accrue interest at a variable spread over LIBOR that results in a weighted average spread for all 2018-2 Notes of 2.95%.
[3]	The interest rate of these notes is partially hedged to an effective interest rate of 6.0% for $323.6 million of the principal borrowings. See Note 13—Derivative Financial Instruments.
[4]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than October 31, 2019.
[5]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than November 20, 2020.

Debt Obligations - Additional I

Debt Obligations - Additional Information (Details) - USD ($)		1 Months Ended				9 Months Ended		12 Months Ended
		Aug. 31, 2019	May 31, 2019	Aug. 31, 2018	Jun. 30, 2018	Sep. 30, 2019		Dec. 31, 2018		Jan. 31, 2017	Mar. 31, 2015
Debt Instrument [Line Items]
Principal Borrowings Outstanding						$ 1,453,281,000		$ 1,240,389,000
Restricted cash and cash equivalents						83,743,000		71,305,000
Unamortized debt issuance costs						25,532,000		24,657,000
Letter of credit related to insurance contracts						18,900,000
Minimum
Debt Instrument [Line Items]
Restricted cash and cash equivalents						10,000,000		10,000,000
Solar Asset Backed Notes, Series 2018-1
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[1]					$ 454,100,000		$ 462,826,000
Interest Rate	[1]					5.10%		5.10%
Revolving credit facility maturity date	[1]					Oct. 31, 2028		Oct. 31, 2028
Unamortized debt issuance costs	[1]					$ 8,603,000		$ 9,172,000
Solar Asset Backed Notes, Series 2018-1 | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						$ 15,000,000
Solar Asset Backed Notes, Series 2018-1 | Class A Notes
Debt Instrument [Line Items]
Principal Borrowings Outstanding					$ 400,000,000
Interest Rate					4.73%	4.73%
Revolving credit facility maturity date					Oct. 30, 2028
Solar Asset Backed Notes, Series 2018-1 | Class B Notes
Debt Instrument [Line Items]
Principal Borrowings Outstanding					$ 66,000,000
Interest Rate					7.37%	7.37%
Revolving credit facility maturity date					Oct. 30, 2028
Solar Asset Backed Notes, Series 2018-2
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[2],[3]					$ 338,294,000		$ 342,833,000
Interest Rate	[2],[3]					5.50%		5.40%
Revolving credit facility maturity date					Aug. 29, 2023	Aug. 31, 2023	[2],[3]	Aug. 31, 2023	[2],[3]
Unamortized debt issuance costs	[2],[3]					$ 6,457,000		$ 7,388,000
Solar Asset Backed Notes, Series 2018-2 | Interest Rate Swaps
Debt Instrument [Line Items]
Principal Borrowings Outstanding						$ 323,600,000
Effective interest rate of principal borrowings					5.95%	6.00%
Solar Asset Backed Notes, Series 2018-2 | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate					2.95%
Solar Asset Backed Notes, Series 2018-2 | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						$ 25,200,000
Solar Asset Backed Notes, Series 2018-2 | Class A Notes
Debt Instrument [Line Items]
Principal Borrowings Outstanding					$ 296,000,000
Solar Asset Backed Notes, Series 2018-2 | Class A Notes | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate					2.95%	2.95%
Solar Asset Backed Notes, Series 2018-2 | Class B Notes
Debt Instrument [Line Items]
Principal Borrowings Outstanding					$ 49,000,000
Solar Asset Backed Notes, Series 2018-2 | Class B Notes | L I B O R Plus
Debt Instrument [Line Items]
Debt instrument interest rate						4.75%
Solar Asset Backed Notes, Series 2018-2 | Class B Notes | L I B O R Plus | Weighted Average
Debt Instrument [Line Items]
Debt instrument interest rate					4.75%
2016 Term Loan Facility
Debt Instrument [Line Items]
Payment of outstanding balance of debt					$ 282,300,000
Payment of outstanding balance of debt principal					281,800,000
Payment of outstanding balance of debt accrued interest					500,000
Unamortized debt issuance costs recognized in interest expense								6,900,000
Prepayment fee					0
Subordinated HoldCo Facility
Debt Instrument [Line Items]
Payment of outstanding balance of debt					206,400,000
Payment of outstanding balance of debt principal					196,600,000
Payment of outstanding balance of debt accrued interest					3,900,000
Unamortized debt issuance costs recognized in interest expense								2,900,000
Prepayment fee					$ 5,900,000
Percentage of principal prepayments fee					3.00%
Subordinated HoldCo Facility | Interest Expense
Debt Instrument [Line Items]
Prepayment fee								5,900,000
2017 Term Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding						$ 183,116,000		$ 188,922,000
Interest Rate						6.00%		6.00%
Revolving credit facility maturity date						Jan. 31, 2035		Jan. 31, 2035
Interest on borrowings accrue at an annual fixed rate and payable in arrears										6.00%
Debt instrument, frequency of periodic payment						quarterly basis
Unamortized debt issuance costs						$ 4,326,000		$ 4,614,000
2017 Term Loan Facility | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						20,200,000
2018 Forward Flow Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[4]					$ 125,048,000		$ 58,425,000
Interest Rate	[4]					4.70%		5.20%
Debt instrument interest rate				1.50%
Maximum borrowing amount under credit agreement				$ 130,000,000
Debt instrument maturity period				20 years		20 years
Debt instrument offering date						Oct. 31, 2019
Debt Instrument interest rate description						Interest on each loan will accrue at an annual rate equal to the U.S. swap rate for the weighted-average life of such loan, plus an applicable margin equal to the greater of (a) 1.9% plus a spread adjustment based on the risk premium on the borrowing date relative to the market index-based risk premium on the closing date and (b) 1.5%. Scheduled principal payments are due on a quarterly basis, at the end of January, April, July and October of each year.
Unamortized debt issuance costs	[4]					$ 3,145,000		$ 3,365,000
2018 Forward Flow Loan Facility | Maximum
Debt Instrument [Line Items]
Revolving credit facility maturity date						Oct. 31, 2019
2018 Forward Flow Loan Facility | Market Index-Based Risk Premium
Debt Instrument [Line Items]
Debt instrument interest rate				1.90%
2018 Forward Flow Loan Facility | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						$ 6,400,000
2019 Forward Flow Loan Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[5]					$ 50,353,000
Interest Rate	[5]					3.90%
Maximum borrowing amount under credit agreement			$ 150,000,000
Debt instrument maturity period			20 years			20 years
Debt instrument offering date			Nov. 20, 2020
Debt Instrument interest rate description						Interest on each loan will accrue at an annual rate equal to the greater of (a) 4.70% and (b) the U.S. Treasury rate for the weighted-average life of such loan, plus an applicable margin equal to 2.35%. Scheduled principal payments are due on a quarterly basis, at the end of January, April, July and October of each year.
Prepayment percentage on outstanding loans			102.50%
Unamortized debt issuance costs	[5]					$ 2,902,000
2019 Forward Flow Loan Facility | Maximum
Debt Instrument [Line Items]
Revolving credit facility maturity date						Nov. 20, 2020
2019 Forward Flow Loan Facility | Market Index-Based Risk Premium
Debt Instrument [Line Items]
Debt instrument interest rate			4.70%
2019 Forward Flow Loan Facility | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						$ 2,000,000
Revolving Warehouse Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding						$ 170,000,000
Interest Rate						4.70%
Revolving credit facility maturity date						Aug. 31, 2023
Maximum borrowing amount under credit agreement		$ 325,000,000
Line of credit facility option to expand maximum borrowing capacity		$ 400,000,000
Revolving Warehouse Facility | Minimum | Interest Rate Swaps
Debt Instrument [Line Items]
Percentage of outstanding term loans in interest rate hedged		90.00%				90.00%
Revolving Warehouse Facility | L I B O R Plus
Debt Instrument [Line Items]
Debt instrument interest rate		2.375%
Revolving Warehouse Facility | Required Reserves
Debt Instrument [Line Items]
Restricted cash and cash equivalents						$ 4,800,000
Revolving Warehouse Facility | After Three Years Term of Facility | L I B O R Plus
Debt Instrument [Line Items]
Debt instrument interest rate		3.375%
Aggregation Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[6]							$ 50,000,000
Interest Rate	[6]							5.70%
Revolving credit facility maturity date	[6]							Sep. 30, 2020
Payment of outstanding balance of debt		$ 121,400,000
Payment of outstanding balance of debt principal		115,000,000
Payment of outstanding balance of debt accrued interest		600,000
Unamortized debt issuance costs recognized in interest expense						2,500,000
Amounts related to settle interest rate swaps		5,800,000
Unamortized debt issuance costs		$ 3,600,000
Deferred unamortized debt issuance costs						1,100,000
Working Capital Facility
Debt Instrument [Line Items]
Principal Borrowings Outstanding	[6],[7]					$ 131,100,000		$ 136,100,000
Interest Rate	[6],[7]					5.40%		5.60%
Revolving credit facility maturity date	[6],[7]					Mar. 31, 2020		Mar. 31, 2020
Debt instrument interest rate						2.25%
Maximum borrowing amount under credit agreement											$ 150,000,000
Debt Instrument interest rate description						(1) a rate equal to the Eurodollar Rate for the interest period divided by one minus the Eurodollar Reserve Percentage, plus a margin of 3.25%; or (2) the highest of (a) the Federal Funds Rate plus 0.50%, (b) the Citibank prime rate and (c) the one-month interest period Eurodollar rate plus 1.00%, plus a margin of 2.25%. Interest is payable depending on the type of borrowing at the end of (1) the interest period that the Company may elect as a term, not to exceed three months, (2) quarterly or (3) at maturity of the Working Capital Facility.
Letter of credit related to insurance contracts						$ 18,900,000
Minimum cash balance requirement						$ 30,000,000
Working Capital Facility | Eurodollar Reserve Percentage Plus
Debt Instrument [Line Items]
Debt instrument interest rate						3.25%
Working Capital Facility | Federal Funds Rate Plus
Debt Instrument [Line Items]
Debt instrument interest rate						0.50%
Working Capital Facility | Euro Dollar Rate Plus
Debt Instrument [Line Items]
Debt instrument interest rate						1.00%
[1]	The interest rate disclosed in the table above is a weighted-average rate. The Series 2018-1 Notes are comprised of Class A and Class B Notes. Class A Notes accrue interest at 4.73%. Class B Notes accrue interest at 7.37%.
[2]	The Series 2018-2 Notes are comprised of Class A and Class B Notes. Class B Notes accrue interest at a rate of LIBOR plus 4.75%. Class A Notes accrue interest at a variable spread over LIBOR that results in a weighted average spread for all 2018-2 Notes of 2.95%.
[3]	The interest rate of these notes is partially hedged to an effective interest rate of 6.0% for $323.6 million of the principal borrowings. See Note 13—Derivative Financial Instruments.
[4]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than October 31, 2019.
[5]	The maturity date for this facility is 20 years from the end date of the borrowing availability period when all borrowings are aggregated into one term loan, which will be no later than November 20, 2020.
[6]	Revolving lines of credit are not presented net of unamortized debt issuance costs.
[7]	This facility is recourse debt, which refers to debt that is collateralized by the Company’s general assets. All of the Company’s other debt obligations are non-recourse, which refers to debt that is only collateralized by specified assets or subsidiaries of the Company.

Leases - Summary of Lease Costs

Leases - Summary of Lease Costs and Other Information (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Sep. 30, 2018
Lease cost
Amortization of right-of-use assets	$ 465	$ 1,125
Interest on lease liabilities	96	180
Operating lease cost	2,818	8,358
Short-term lease cost	413	1,714
Total lease cost	3,792	11,377
Finance leases:
Operating cash outflows from finance leases	96	180
Financing cash outflows from finance leases	377	954	$ 2,663
Right-of-use assets obtained in exchange for new finance lease liabilities	$ 2,321	$ 6,077	$ 1,079
Weighted-average remaining lease term - finance leases (in years)	3 years 7 months 6 days	3 years 7 months 6 days
Weighted-average discount rate - finance leases	7.40%	7.40%
Operating leases:
Operating cash outflows from operating leases	$ 2,870	$ 8,505
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 545	$ 9,210
Weighted-average remaining lease term - operating leases (in years)	9 years 3 months 18 days	9 years 3 months 18 days
Weighted-average discount rate - operating leases	8.00%	8.00%

Leases - Additional Information

Leases - Additional Information (Details)	9 Months Ended
	Sep. 30, 2019
Fleet Vehicles Lease
Lessee Lease Description [Line Items]
Lessee, Finance Lease, Existence of Option to Extend [true false]	true
Description of finance lease, option to extend	The master lease agreements allow for the Company to extend fleet vehicle leases on a month-to-month basis
Office Lease
Lessee Lease Description [Line Items]
Operating lease, additional term	3 years
Operating lease, term of contract	15 years
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Description of operating lease, option to extend	The corporate office lease includes options to extend the lease term for two additional periods of five years
Warehouse Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, term of contract	5 years
Lessee, Operating Lease, Existence of Option to Extend [true false]	true
Minimum | Fleet Vehicles Lease
Lessee Lease Description [Line Items]
Finance lease, agreement period	3 years
Minimum | Warehouse Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, term of contract	2 years
Minimum | Equipment Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, term of contract	3 years
Maximum | Fleet Vehicles Lease
Lessee Lease Description [Line Items]
Finance lease, agreement period	5 years
Maximum | Warehouse Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, term of contract	9 years
Maximum | Equipment Lease Agreement
Lessee Lease Description [Line Items]
Operating lease, term of contract	5 years

Leases - Schedule of Future Min

Leases - Schedule of Future Minimum Lease Payments for Finance Leases (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finance Lease Liabilities Payments Due [Abstract]
2019	$ 511
2020	1,839
2021	1,815
2022	1,689
2023	769
Total minimum lease payments	6,623
Less: interest	786
Present value of finance lease obligations	5,837
Less: current portion	1,529	$ 1,921
Long-term portion	$ 4,308	$ 505

Leases - Schedule of Future M_2

Leases - Schedule of Future Minimum Lease Payments Under Non-cancellable Operating Leases (Details) $ in Thousands	Sep. 30, 2019USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2019	$ 2,845
2020	10,466
2021	8,090
2022	5,815
2023	4,780
Thereafter	36,680
Total minimum lease payments	68,676
Less: present value impact	21,360
Present value of operating lease obligations	47,316
Less: current portion	7,432
Long-term portion	$ 39,884

Derivative Financial Instrume_3

Derivative Financial Instruments - Schedule of Derivative Financial Instruments at Fair Value (Details) - Interest Rate Swaps - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Other Noncurrent Liabilities
Derivatives Fair Value [Line Items]
Fair Value, Derivatives designated as hedging instruments	$ 33,323	$ 9,884
Fair Value, Derivatives not designated as hedging instruments	$ 1,978	1,262
Other Noncurrent Assets
Derivatives Fair Value [Line Items]
Fair Value, Derivatives not designated as hedging instruments		$ 130

Derivative Financial Instrume_4

Derivative Financial Instruments - Additional Information (Details) - USD ($)	9 Months Ended
	Sep. 30, 2019	Aug. 31, 2019
Revolving Warehouse Facility | Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional amount	$ 142,500,000
Revolving Warehouse Facility | Interest Rate Swaps | Minimum
Derivatives Fair Value [Line Items]
Percentage of outstanding term loans in interest rate hedged	90.00%	90.00%
Revolving Warehouse Facility | Additional Interest Rate Swaps | Derivatives Not Designated as Hedging Instruments
Derivatives Fair Value [Line Items]
Notional amount	$ 10,500,000
2018-2 Notes | Interest Rate Swaps
Derivatives Fair Value [Line Items]
Notional amount	323,600,000
Accumulated other comprehensive income, expected amount of cash flow hedge to be reclassified to interest expense within the next 12 months	$ 4,300,000

Derivative Financial Instrume_5

Derivative Financial Instruments - Schedule of Losses (Gains) on Derivative Financial Instruments Recognized in OCI and Condensed Consolidated Statements of Operations Before Tax Effect (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts presented in the income statement line items, Interest expense	$ 22,804	$ 18,715	$ 61,403	$ 46,973
Total losses (gains)			846	(1,279)
Total amounts presented in the income statement line items, Other (income) expense, net	3,907	(1)	6,657	(6,371)
Interest Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Total losses (gains)	517	535	1,077	(22,181)
Other (Income) Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Total losses (gains)	3,906		6,656	(4,252)
Derivatives Designated as Hedging Instruments | Cash Flow Hedging | Interest Rate Swaps | Interest Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Losses (gains) reclassified from AOCI into income	517	535	1,077	(22,181)
Derivatives Designated as Hedging Instruments | Cash Flow Hedging | Interest Rate Swaps | Other Comprehensive Income
Derivative Instruments, Gain (Loss) [Line Items]
Losses (gains) recognized in OCI	7,889	$ (3,966)	24,516	(8,284)
Derivatives Not Designated as Hedging Instruments | Interest Rate Swaps | Other (Income) Expense, Net
Derivative Instruments, Gain (Loss) [Line Items]
Losses (gains) recognized in income	$ 3,906		$ 6,656	$ (4,252)

Investment Funds - Additional I

Investment Funds - Additional Information (Details) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Dec. 31, 2018
Investment Holdings [Line Items]
Summary of investment fund		The Company has formed investment funds for the purpose of funding the purchase of solar energy systems under long-term customer contracts.
Investors cash contribution to variable interest equity	$ 1,849,400,000	$ 1,849,400,000	$ 1,565,300,000
Solar energy systems, net	1,696,129,000	1,696,129,000	1,938,874,000
Prepaid insurance balance	7,700,000	7,700,000	8,300,000
Distributions paid to reimburse fund investors	0	0
Accrued estimated distribution	3,500,000	3,500,000
Restricted cash	83,743,000	83,743,000	71,305,000
Minimum
Investment Holdings [Line Items]
Restricted cash	10,000,000	10,000,000	10,000,000
Variable Interest Entities
Investment Holdings [Line Items]
Solar energy systems, net	1,541,344,000	1,541,344,000	1,752,271,000
Investment tax credit repayment		0
Restricted cash	8,361,000	8,361,000	2,443,000
Financing Obligation
Investment Holdings [Line Items]
Solar energy systems, net	44,300,000	44,300,000	55,800,000
Financing liabilities	4,700,000	4,700,000	$ 5,300,000
Investor
Investment Holdings [Line Items]
Investors cash contribution to variable interest equity	$ 110,000,000	$ 110,000,000

Investment Funds - Aggregate Ca

Investment Funds - Aggregate Carrying Value of Funds Assets and Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents		$ 260,753	$ 219,591
Accounts receivable, net		27,203	14,207
Prepaid expenses and other current assets		31,895	31,201
Total current assets		333,578	278,256
Restricted cash and cash equivalents		83,743	71,305
Solar energy systems, net		1,696,129	1,938,874
Other non-current assets, net		567,872	28,090
TOTAL ASSETS	[1]	2,695,654	2,327,255
Current liabilities:
Distributions payable to non-controlling interests and redeemable non-controlling interests		17,328	7,846
Current portion of long-term debt		144,532	12,155
Current portion of deferred revenue		28,684	30,199
Accrued and other current liabilities		70,238	42,860
Total current liabilities		351,076	166,430
Long-term debt, net of current portion		1,282,868	1,203,282
Deferred revenue, net of current portion		16,450	13,524
Other non-current liabilities		81,740	24,610
Total liabilities	[1]	2,275,632	1,845,471
Variable Interest Entities
Current assets:
Cash and cash equivalents		103,921	62,350
Accounts receivable, net		17,385	6,593
Prepaid expenses and other current assets		2,384	1,289
Total current assets		123,690	70,232
Restricted cash and cash equivalents		8,361	2,443
Solar energy systems, net		1,541,344	1,752,271
Other non-current assets, net		459,771	10,888
TOTAL ASSETS		2,133,166	1,835,834
Current liabilities:
Distributions payable to non-controlling interests and redeemable non-controlling interests		17,328	7,846
Current portion of long-term debt		2,396	1,512
Current portion of deferred revenue		2,272	2,320
Accrued and other current liabilities		6,027	4,860
Total current liabilities		28,023	16,538
Long-term debt, net of current portion		166,864	53,505
Deferred revenue, net of current portion		11,484	9,694
Other non-current liabilities		375	1,023
Total liabilities		$ 206,746	$ 80,760
[1]	The assets of Vivint Solar, Inc. (the “Company”) as of September 30, 2019 and December 31, 2018 include $2,133.2 million and $1,835.8 million consisting of assets of variable interest entities, or VIEs, that can only be used to settle obligations of the VIEs. These assets include solar energy systems, net, of $1,541.3 million and $1,752.3 million as of September 30, 2019 and December 31, 2018; other non-current assets, net of $459.8 million and $10.9 million as of September 30, 2019 and December 31, 2018; cash and cash equivalents of $103.9 million and $62.4 million as of September 30, 2019 and December 31, 2018; accounts receivable, net, of $17.4 million and $6.6 million as of September 30, 2019 and December 31, 2018; restricted cash and cash equivalents of $8.4 million and $2.4 million as of September 30, 2019 and December 31, 2018; and prepaid expenses and other current assets of $2.4 million and $1.3 million as of September 30, 2019 and December 31, 2018. The Company’s liabilities as of September 30, 2019 and December 31, 2018 included $206.7 million and $80.8 million of liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include long-term debt of $169.3 million and $55.0 million as of September 30, 2019 and December 31, 2018; distributions payable to non-controlling interests and redeemable non-controlling interests of $17.3 million and $7.8 million as of September 30, 2019 and December 31, 2018; deferred revenue of $13.8 million and $12.0 million as of September 30, 2019 and December 31, 2018; accrued and other current liabilities of $6.0 million and $4.9 million as of September 30, 2019 and December 31, 2018; and other non-current liabilities of $0.4 million and $1.0 million as of September 30, 2019 and December 31, 2018. For further information see Note 14—Investment Funds.

Redeemable Non-Controlling In_3

Redeemable Non-Controlling Interests and Equity - Schedule of Shares of Common Stock Reserved for Issuance (Details) - shares	Sep. 30, 2019	Dec. 31, 2018
Equity [Abstract]
Shares available for grant under equity incentive plans	13,340,000	13,323,000
Restricted stock units issued and outstanding	6,791,000	6,172,000
Stock options issued and outstanding	5,588,000	3,394,000
Long-term incentive plan	2,706,000	2,706,000
Total	28,425,000	25,595,000

Redeemable Non-Controlling In_4

Redeemable Non-Controlling Interests and Equity - Additional Information (Details) $ in Millions	Sep. 30, 2019USD ($)
Put Option | Minimum
Redeemable Noncontrolling Interest [Line Items]
Purchase price for investors' interest in funds under Put Options	$ 2.1
Put Option | Maximum
Redeemable Noncontrolling Interest [Line Items]
Purchase price for investors' interest in funds under Put Options	4.1
Call Option | Minimum
Redeemable Noncontrolling Interest [Line Items]
Purchase price for investors' interest in funds under Put Options	1.2
Call Option | Maximum
Redeemable Noncontrolling Interest [Line Items]
Purchase price for investors' interest in funds under Put Options	$ 7

Equity Compensation Plans - Add

Equity Compensation Plans - Additional Information (Details) - shares	1 Months Ended
	Jan. 31, 2019	Sep. 30, 2019	Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant under equity incentive plans		13,340,000	13,323,000
2014 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant under equity incentive plans		13,300,000
Number of additional shares available for issuance	4,800,000

Equity Compensation Plans - Sum

Equity Compensation Plans - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shares Underlying Options, Outstanding, Balance	3,394,000
Shares Underlying Options, Granted	2,379,000
Shares Underlying Options, Exercised	(139,000)
Shares Underlying Options, Cancelled	(46,000)
Shares Underlying Options, Outstanding, Balance	5,588,000
Shares Underlying Options, Options vested and exercisable	2,312,000
Weighted-Average Exercise Price, Outstanding, Balance	$ 2.77
Weighted-Average Exercise Price, Granted	5.33
Weighted-Average Exercise Price, Exercised	2.18
Weighted-Average Exercise Price, Cancelled	6.65
Weighted-Average Exercise Price, Outstanding, Balance	3.84
Weighted-Average Exercise Price, Options vested and exercisable	$ 2.44
Weighted-Average Remaining Contractual Term, Outstanding, Balance	7 years 8 months 12 days
Weighted-Average Remaining Contractual Term, Options vested and exercisable	5 years 7 months 6 days
Aggregate Intrinsic Value	$ 15,834	$ 4,689
Aggregate Intrinsic Value, Options vested and exercisable	$ 9,963

Equity Compensation Plans - RSU

Equity Compensation Plans - RSU Activity (Details)	9 Months Ended
	Sep. 30, 2019$ / sharesshares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Awards, Outstanding at December 31, 2018 | shares	6,172,000
Number of Awards, Granted | shares	2,926,000
Number of Awards, Vested | shares	(1,834,000)
Number of Awards, Forfeited | shares	(473,000)
Number of Awards, Outstanding at June 30, 2019 | shares	6,791,000
Weighted Average Grant Date Fair Value, Outstanding at December 31, 2018 | $ / shares	$ 3.84
Weighted Average Grant Date Fair Value, Granted | $ / shares	5.89
Weighted Average Grant Date Fair Value, Vested | $ / shares	3.86
Weighted Average Grant Date Fair Value, Forfeited | $ / shares	4.28
Weighted Average Grant Date Fair Value, Outstanding at June 30, 2019 | $ / shares	$ 4.68

Equity Compensation Plans - S_2

Equity Compensation Plans - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	$ 4,150	$ 3,103	$ 11,985	$ 9,884
Cost of Revenue
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	467	361	1,203	984
Sales and Marketing
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	756	754	2,297	2,668
General and Administrative
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	2,891	1,956	8,390	6,125
Research and Development
Schedule Of Stock Options [Line Items]
Stock-based compensation expense	$ 36	$ 32	$ 95	$ 107

Equity Compensation Plans - S_3

Equity Compensation Plans - Summary of Unrecognized Stock-Based Compensation Expense (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019USD ($)
Schedule Of Stock Options [Line Items]
Unrecognized Stock-Based Compensation Expense	$ 28,401
RSUs
Schedule Of Stock Options [Line Items]
Unrecognized Stock-Based Compensation Expense, other than stock options	$ 21,414
Weighted- Average Period of Recognition	1 year 9 months 18 days
Stock Options
Schedule Of Stock Options [Line Items]
Unrecognized Stock-Based Compensation Expense, stock options	$ 6,987
Weighted- Average Period of Recognition	2 years 1 month 6 days

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Effective income tax rate	(71.30%)	(54.70%)	(56.70%)	(70.50%)

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended		9 Months Ended		12 Months Ended
	Aug. 31, 2019	Aug. 31, 2017	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Related Party Transaction [Line Items]
Sales and marketing			$ 46,121	$ 15,841	$ 112,792	$ 40,999
Accounts payable—related party							$ 200
Accrued equity distributions			17,328		17,328		7,846
Prepaid Expenses and Other Current Assets
Related Party Transaction [Line Items]
Accounts receivable—related party			500		500
Related Party
Related Party Transaction [Line Items]
Sales and marketing			500	300	1,500	1,700
Amounts due from direct-sales professionals			6,000		6,000		5,200
Provision for advances to direct-sales professionals					300		900
Accrued equity distributions			1,900		1,900		$ 1,500
Vivint Services
Related Party Transaction [Line Items]
Initial term of agreement period		2 years
Agreement renewal term	1 year	1 year
Payments made in conjunction with agreements entered			$ 900	$ 6,100	$ 7,100	$ 11,400

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Feb. 28, 2018	Sep. 30, 2019	Sep. 30, 2019
Other Commitments [Line Items]
Standby letter of credit outstanding		$ 18,900,000	$ 18,900,000
Total estimated obligation earned over deferment period		8,500,000	8,500,000
Percentage of unpaid deferred residual commissions	50.00%
Payment period of deferred residual commission percentage	18 months
Sales and Marketing Expense
Other Commitments [Line Items]
Increase in residual commission accrual		5,900,000	5,900,000
General and Administrative
Other Commitments [Line Items]
Litigation settlement payment		$ 1,000,000
General and Administrative | Maximum
Other Commitments [Line Items]
Litigation settlement payment			$ 7,250,000

Basic and Diluted Net Loss Pe_3

Basic and Diluted Net Loss Per Share - Computation of Basic and Diluted Net Loss Per Share to Common Stockholders (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Numerator:
Net loss attributable to common stockholders	$ (13,835)	$ (7,868)	$ (68,644)	$ (2,728)
Denominator:
Shares used in computing net loss attributable per share to common stockholders, basic	121,730	118,767	120,974	116,871
Shares used in computing net loss attributable per share to common stockholders, diluted	121,730	118,767	120,974	116,871
Net loss attributable per share to common stockholders:
Basic and diluted	$ (0.11)	$ (0.07)	$ (0.57)	$ (0.02)