Sunrun (RUN) 10-Q 7 Aug 17 2017 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Aug. 03, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Trading Symbol	RUN
Entity Registrant Name	Sunrun Inc.
Entity Central Index Key	1,469,367
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		106,161,704

Consolidated Balance Sheets (Un

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash		$ 211,321	$ 206,364
Restricted cash		15,672	11,882
Accounts receivable (net of allowances for doubtful accounts of $1,550 and $1,166 as of June 30, 2017 and December 31, 2016, respectively)		64,030	60,258
State tax credits receivable		0	13,713
Inventories		52,744	67,326
Prepaid expenses and other current assets		12,575	9,802
Total current assets		356,342	369,345
Restricted cash		5,952	6,117
Solar energy systems, net		2,951,260	2,629,366
Property and equipment, net		41,774	48,471
Intangible assets, net		16,397	18,499
Goodwill		87,543	87,543
Prepaid tax asset		0	378,541
Other assets		29,834	34,936
Total assets (1)	[1]	3,489,102	3,572,818
Current liabilities:
Accounts payable		75,336	66,018
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		13,212	10,654
Accrued expenses and other liabilities		52,961	59,261
Deferred revenue, current portion		70,601	70,849
Deferred grants, current portion		8,363	8,011
Capital lease obligations, current portion		8,525	10,015
Recourse debt, current portion		247,000	0
Long-term non-recourse debt, current portion		18,883	14,153
Lease pass-through financing obligation, current portion		5,869	5,823
Total current liabilities		500,750	244,784
Deferred revenue, net of current portion		578,484	583,401
Deferred grants, net of current portion		222,184	226,893
Capital lease obligations, net of current portion		8,745	12,965
Recourse debt, net of current portion		0	244,000
Long-term non-recourse debt, net of current portion		761,349	639,870
Lease pass-through financing obligation, net of current portion		139,249	137,958
Other liabilities		10,682	5,457
Deferred tax liabilities		54,376	415,397
Total liabilities (1)	[1]	2,275,819	2,510,725
Commitments and contingencies (Note 13)
Redeemable noncontrolling interests		163,077	137,907
Stockholders’ equity:
Preferred stock, $0.0001 par value—authorized, 200,000 shares as of June 30, 2017 and December 31, 2016; no shares issued and outstanding as of June 30, 2017 and December 31, 2016		0	0
Common stock, $0.0001 par value—authorized, 2,000,000 shares as of June 30, 2017 and December 31, 2016; issued and outstanding, 105,940 and 104,321 shares as of June 30, 2017 and December 31, 2016, respectively		11	10
Additional paid-in capital		679,066	668,076
Accumulated other comprehensive income		(3,132)	437
Retained earnings		45,282	4,438
Total stockholders’ equity		721,227	672,961
Noncontrolling interests		328,979	251,225
Total equity		1,050,206	924,186
Total liabilities, redeemable noncontrolling interests and total equity		$ 3,489,102	$ 3,572,818
[1]	The Company’s consolidated assets as of June 30, 2017 and December 31, 2016 include $2,379,224 and $2,065,232, respectively, in assets of variable interest entities, or “VIEs”, that can only be used to settle obligations of the VIEs. Solar energy systems, net, as of June 30, 2017 and December 31, 2016 were $2,237,670 and $1,920,330, respectively; cash as of June 30, 2017 and December 31, 2016 were $108,039 and $120,728, respectively; restricted cash as of June 30, 2017 and December 31, 2016 were $3,574 and $1,680, respectively; accounts receivable, net as of June 30, 2017 and December 31, 2016 were $27,547 and $20,771, respectively; prepaid expenses and other current assets as of June 30, 2017 and December 31, 2016 were $235 and $242, respectively and other assets as of June 30, 2017 and December 31, 2016 were $2,159 and $1,481, respectively. The Company’s consolidated liabilities as of June 30, 2017 and December 31, 2016 include $762,273 and $617,011, respectively, in liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include accounts payable as of June 30, 2017 and December 31, 2016 of $22,196 and $14,873, respectively; distributions payable to noncontrolling interests and redeemable noncontrolling interests as of June 30, 2017 and December 31, 2016 of $13,213 and $10,654, respectively; accrued expenses and other liabilities as of June 30, 2017 and December 31, 2016 of $1,471 and $782, respectively; deferred revenue as of June 30, 2017 and December 31, 2016 of $444,103 and $422,685, respectively; deferred grants as of June 30, 2017 and December 31, 2016 of $106,933 and $109,034, respectively; and long-term non-recourse debt as of June 30, 2017 and December 31, 2016 of $172,020 and $58,983, respectively.

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016
Allowance for doubtful accounts		$ 1,550	$ 1,166
Preferred stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Preferred stock, shares authorized		200,000,000	200,000,000
Preferred stock, shares issued		0	0
Preferred stock, shares outstanding		0	0
Common stock, par value (in dollars per share)		$ 0.0001	$ 0.0001
Common stock, shares authorized		2,000,000,000	2,000,000,000
Common stock, shares issued		105,940,000	104,321,000
Common stock, shares outstanding		105,940,000	104,321,000
Total assets	[1]	$ 3,489,102	$ 3,572,818
Solar energy systems, net		2,951,260	2,629,366
Cash		211,321	206,364
Restricted cash		15,672	11,882
Accounts receivable, net		64,030	60,258
Prepaid expenses and other current assets		12,575	9,802
Other assets		29,834	34,936
Total liabilities	[1]	2,275,819	2,510,725
Accounts payable		75,336	66,018
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		13,212	10,654
Accrued expenses and other liabilities		52,961	59,261
Long-term non-recourse debt		1,027,232	898,023
Variable Interest Entities
Total assets		2,379,224	2,065,232
Solar energy systems, net		2,237,670	1,920,330
Cash		108,039	120,728
Restricted cash		3,574	1,680
Accounts receivable, net		27,547	20,771
Prepaid expenses and other current assets		235	242
Other assets		2,159	1,481
Total liabilities		762,273	617,011
Accounts payable		22,196	14,873
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		13,213	10,654
Accrued expenses and other liabilities		1,471	782
Deferred revenue		444,103	422,685
Deferred grants		106,933	109,034
Long-term non-recourse debt		$ 172,020	$ 58,983
[1]	The Company’s consolidated assets as of June 30, 2017 and December 31, 2016 include $2,379,224 and $2,065,232, respectively, in assets of variable interest entities, or “VIEs”, that can only be used to settle obligations of the VIEs. Solar energy systems, net, as of June 30, 2017 and December 31, 2016 were $2,237,670 and $1,920,330, respectively; cash as of June 30, 2017 and December 31, 2016 were $108,039 and $120,728, respectively; restricted cash as of June 30, 2017 and December 31, 2016 were $3,574 and $1,680, respectively; accounts receivable, net as of June 30, 2017 and December 31, 2016 were $27,547 and $20,771, respectively; prepaid expenses and other current assets as of June 30, 2017 and December 31, 2016 were $235 and $242, respectively and other assets as of June 30, 2017 and December 31, 2016 were $2,159 and $1,481, respectively. The Company’s consolidated liabilities as of June 30, 2017 and December 31, 2016 include $762,273 and $617,011, respectively, in liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include accounts payable as of June 30, 2017 and December 31, 2016 of $22,196 and $14,873, respectively; distributions payable to noncontrolling interests and redeemable noncontrolling interests as of June 30, 2017 and December 31, 2016 of $13,213 and $10,654, respectively; accrued expenses and other liabilities as of June 30, 2017 and December 31, 2016 of $1,471 and $782, respectively; deferred revenue as of June 30, 2017 and December 31, 2016 of $444,103 and $422,685, respectively; deferred grants as of June 30, 2017 and December 31, 2016 of $106,933 and $109,034, respectively; and long-term non-recourse debt as of June 30, 2017 and December 31, 2016 of $172,020 and $58,983, respectively.

Consolidated Statements of Oper

Consolidated Statements of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue:
Operating leases and incentives	$ 65,337	$ 45,394	$ 113,435	$ 79,934
Solar energy systems and product sales	72,511	77,144	128,530	141,347
Total revenue	137,848	122,538	241,965	221,281
Operating expenses:
Cost of operating leases and incentives	47,114	38,608	91,450	76,708
Cost of solar energy systems and product sales	60,938	61,600	110,369	119,112
Sales and marketing	32,784	43,716	64,460	86,904
Research and development	3,710	2,373	6,706	4,836
General and administrative	25,230	23,614	49,851	46,862
Amortization of intangible assets	1,051	1,051	2,102	2,103
Total operating expenses	170,827	170,962	324,938	336,525
Loss from operations	(32,979)	(48,424)	(82,973)	(115,244)
Interest expense, net	16,602	13,063	31,879	24,578
Other expenses (income), net	208	30	683	(502)
Loss before income taxes	(49,789)	(61,517)	(115,535)	(139,320)
Income tax expense	15,453	3,210	22,791	3,210
Net loss	(65,242)	(64,727)	(138,326)	(142,530)
Net loss attributable to noncontrolling interests and redeemable noncontrolling interests	(90,364)	(97,370)	(176,175)	(188,307)
Net income available to common stockholders	$ 25,122	$ 32,643	$ 37,849	$ 45,777
Net income per share available to common stockholders
Basic (in dollars per share)	$ 0.24	$ 0.32	$ 0.36	$ 0.45
Diluted (in dollars per share)	$ 0.23	$ 0.31	$ 0.35	$ 0.44
Weighted average shares used to compute net income per share available to common stockholders
Weighted average shares used to compute net income per share attributable to common stockholders, basic (in shares)	105,093	101,969	104,568	101,621
Weighted average shares used to compute net income per share attributable to common stockholders, diluted (in shares)	107,347	104,768	106,911	104,494

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income attributable to common stockholders	$ 25,122	$ 32,643	$ 37,849	$ 45,777
Other comprehensive income:
Unrealized loss on derivatives, net of income taxes	(3,709)	165	(4,473)	(5,633)
Less interest expense on derivatives recognized into earnings, net of income taxes	(340)	(120)	(904)	(645)
Comprehensive income	$ 21,753	$ 32,928	$ 34,280	$ 40,789

Consolidated Statements of Cash

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Operating activities:
Net loss	$ (138,326)	$ (142,530)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization, net of amortization of deferred grants	65,282	46,564
Deferred income taxes	22,788	3,210
Stock-based compensation expense	11,389	8,647
Noncash interest expense	9,481	5,335
Interest on lease pass-through financing obligations	5,949	6,019
Reduction in lease pass-through financing obligations	(9,162)	(9,491)
Other noncash losses and expenses	4,590	2,924
Changes in operating assets and liabilities:
Accounts receivable	(4,215)	3,884
Inventories	14,582	(16,839)
Prepaid and other assets	(2,854)	(2,760)
Accounts payable	2,636	(9,889)
Accrued expenses and other liabilities	(11,283)	3,218
Deferred revenue	(4,314)	3,295
Net cash used in operating activities	(33,457)	(98,413)
Investing activities:
Payments for the costs of solar energy systems, leased and to be leased	(356,726)	(332,472)
Purchases of property and equipment	(4,464)	(8,208)
Business acquisition, net of cash acquired	0	(5,000)
Net cash used in investing activities	(361,190)	(345,680)
Financing activities:
Proceeds from state tax credits, net of recapture	13,171	9,123
Payment of debt fees	(4,955)	(12,277)
Proceeds from lease pass-through financing obligations	3,062	12,805
Contributions received from noncontrolling interests and redeemable noncontrolling interests	303,545	239,621
Distributions paid to noncontrolling interests and redeemable noncontrolling interests	(24,635)	(18,257)
(Payments) proceeds from exercises of stock options, net of withholding taxes on restricted stock units and issuance of shares in connection with the Employee Stock Purchase Plan	(425)	3,616
Offering costs paid related to initial public offering	0	(437)
Payment of capital lease obligations	(5,262)	(6,416)
Change in restricted cash	(2,592)	1,068
Net cash provided by financing activities	399,604	447,449
Net change in cash	4,957	3,356
Cash, beginning of period	206,364	203,864
Cash, end of period	211,321	207,220
Supplemental disclosures of cash flow information
Cash paid for interest	17,434	10,676
Cash paid for taxes	0	0
Supplemental disclosures of noncash investing and financing activities
Purchases of solar energy systems and property and equipment included in accounts payable and accrued expenses	25,284	15,586
Purchases of solar energy systems included in non-recourse debt	12,873	0
Distributions payable to noncontrolling interests and redeemable noncontrolling interests	13,212	8,515
Vehicles acquired under capital leases	94	10,914
Recourse debt
Financing activities:
Proceeds from issuance of debt	91,400	257,400
Repayment of debt	(88,400)	(212,000)
Non recourse debt
Financing activities:
Proceeds from issuance of debt	199,525	189,746
Repayment of debt	$ (84,830)	$ (16,543)

Organization

Organization	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization	Organization Sunrun Inc. (“Sunrun” or the “Company”) was originally formed in 2007 as a California limited liability company and was converted into a Delaware corporation in 2008. The Company is engaged in the design, development, installation, sale, ownership and maintenance of residential solar energy systems (“Projects”) in the United States. Sunrun acquires customers directly and through relationships with various solar and strategic partners (“Partners”). The Projects are constructed either by Sunrun or by Sunrun’s Partners and are owned by the Company. Sunrun’s customers enter into a power purchase agreement (“PPA”) or a lease (each, a “Customer Agreement”) which typically has a term of 20 years. Sunrun monitors, maintains and insures the Projects. The Company also sells solar energy systems and products, such as panels and racking and solar leads generated to customers. The Company has formed various subsidiaries (“Funds”) to finance the development of Projects. These Funds, structured as limited liability companies, obtain financing from outside investors and purchase or lease Projects from Sunrun under master purchase or master lease agreements. The Company currently utilizes three legal structures in its investment Funds, which are referred to as: (i) lease pass-throughs, (ii) partnership-flips and (iii) joint venture (“JV”) inverted leases.

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Basis of Presentation and Principles of Consolidation The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission 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 consolidated financial statements and accompanying notes included in the Company’s annual report on Form 10-K for the year ended December 31, 2016 . The unaudited consolidated financial statements are prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments (all of which are considered of normal recurring nature) considered necessary to present fairly the Company’s financial results. The results of the six months ended June 30, 2017 are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2017 or other future periods. The consolidated financial statements reflect the accounts and operations of the Company and those of its subsidiaries, including Funds, in which the Company has a controlling financial interest. The typical condition for a controlling financial interest ownership is holding a majority of the voting interests of an entity. However, a controlling financial interest may also exist in entities, such as variable interest entities (“VIEs”), through arrangements that do not involve controlling voting interests. In accordance with the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 810 (“ASC 810”) Consolidation , the Company consolidates any VIE of which it is the primary beneficiary. The primary beneficiary, as defined in ASC 810, is the party that has (1) the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and (2) the obligation to absorb the losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company evaluates its relationships with its VIEs on an ongoing basis to determine whether it continues to be the primary beneficiary. The consolidated financial statements reflect the assets and liabilities of VIEs that are consolidated. All intercompany transactions and balances have been eliminated in consolidation. Use of Estimates The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The Company regularly makes significant estimates and assumptions, including, but not limited to, the estimates that affect the collectability of accounts receivable, the valuation of inventories, the useful lives of solar energy systems, the useful lives of property and equipment, the valuation and useful lives of intangible assets, the fair value of assets acquired and liabilities assumed in business combinations, the effective interest rate used to amortize lease pass-through financing obligations, the fair value used to value solar energy systems, the valuation of stock-based compensation, the determination of valuation allowances associated with deferred tax assets, the fair value of debt instruments disclosed and the redemption value of redeemable noncontrolling interests. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Actual results may differ from such estimates. Segment Information The Company has one operating segment with one business activity, providing solar energy services and products to customers. The Company’s chief operating decision maker (“CODM”) is its Chief Executive Officer, who manages operations on a consolidated basis for purposes of allocating resources. When evaluating performance and allocating resources, the CODM reviews financial information presented on a consolidated basis. Revenues from external customers (including, but not limited to homeowners) for each group of similar products and services are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Operating leases $ 47,034 $ 32,980 $ 82,096 $ 58,307 Incentives 18,303 12,414 31,339 21,627 Operating leases and incentives 65,337 45,394 113,435 79,934 Solar energy systems 28,078 35,878 48,697 66,070 Products 44,433 41,266 79,833 75,277 Solar energy systems and product sales 72,511 77,144 128,530 141,347 Total revenue $ 137,848 $ 122,538 $ 241,965 $ 221,281 Fair Value of Financial Instruments The Company defines fair value as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company uses valuation approaches to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. The FASB establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows: • Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date; • Level 2—Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities; and • Level 3—Inputs that are unobservable, significant to the measurement of the fair value of the assets or liabilities and are supported by little or no market data. The Company’s financial instruments include cash, receivables, accounts payable, accrued expenses, distributions payable to noncontrolling interests, derivatives, and recourse and non-recourse debt. Recently Issued and Adopted Accounting Standards In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09 Revenue from Contracts with Customers (Topic 606). The standard establishes a single revenue recognition model for all contracts with customers, eliminates industry specific requirements, and expands disclosure requirements. This ASU is effective for the Company for annual reporting periods beginning after December 15, 2017 including the interim reporting periods within that fiscal year. Adoption of this ASU is either retrospective to each prior period presented or retrospective with a cumulative adjustment to retained earnings or accumulated deficit as of the adoption date. The Company currently accounts for Customer Agreements pursuant to ASC 840, Leases. The Company currently believes the adoption of ASC 842, Leases ("ASC 842") will cause Customer Agreements to be accounted for under ASC 606. As such, the Company is considering adopting ASC 842 simultaneously with its adoption of ASC 606. Under ASC 606, total consideration for Customer Agreements, including price escalators, may be recognized ratably over the term of the Customer Agreement. Customer Agreements with a prepaid element may include a significant financing component which will increase total consideration and interest expense using the effective interest rate method. The Company expects to accelerate the timing of revenue recognition for certain incentives recognized under "Operating leases and incentives." The accounting is not expected to materially differ for revenue currently recognized as "Solar energy systems and product sales." The Company is continuing to assess the impact of such changes, as well as other potential impacts of the revenue and lease standards. The Company has a project plan in place to meet the requirements of these standards using internal resources and consultants. The Company has completed its initial assessment and is currently performing contract reviews and developing a preliminary accounting policy. In February 2016, the FASB issued ASU No. 2016-02 to replace existing lease guidance with ASC 842, Leases . ASC 842 changes how the definition of a lease is applied and judgment may be required in applying the definition of a lease to certain arrangements. The new standard may result in certain contracts no longer being leases. For lessees, the standard requires all leases with an initial term greater than one year be recorded on the balance sheet as an asset and a lease liability. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a modified retrospective approach. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation . The new guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also requires the Company to make an accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures as they occur. The Company adopted the new ASU effective January 1, 2017. The Company elected to continue to estimate the number of awards that are expected to vest. Upon the adoption, deferred tax liabilities decreased by $3.3 million , and retained earnings increased by $3.3 million as of January 1, 2017. In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments , which replaces the current incurred loss impairment methodology with a current expected credit losses model. The amendment applies to entities which hold financial assets and net investment in leases that are not accounted for at fair value through net income as well as loans, debt securities, trade receivables, net investments in leases, off-balance sheet credit exposures, reinsurance receivables and any other financial assets not excluded from the scope that have the contractual right to receive cash. This ASU is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a modified retrospective approach, with certain aspects requiring a prospective approach. The Company is currently evaluating this guidance and the impact it may have on the Company’s consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory , which requires entities to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. As a result, a reporting entity will recognize the tax expense from the sale of assets in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in the consolidated financial statements. Any deferred tax asset that arises in the buyer’s jurisdiction will also be recognized at the time of the transfer. The Company adopted the standard effective January 1, 2017. As the Company sells solar energy systems to Funds, the Company will record the current tax effects of the gain on such sales as well as a deferred tax asset related to the Company’s increased tax basis in the partnership as a result of such sales. As a result of the adoption, the Company reversed net prepaid tax assets of $378.5 million , recognized gross deferred tax assets of $378.2 million and recorded a cumulative adjustment decreasing retained earnings by $0.3 million as of January 1, 2017. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, which requires a statement of cash flows to present the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash and restricted cash equivalents. This ASU is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a retrospective approach. As a result, the Company will no longer present transfers between cash and restricted cash in the consolidated cash flow statements upon adoption in the first quarter of 2018. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business, to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions of assets or businesses. The amendments in this update provide a screen to determine when a set of operations is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The Company early adopted the new ASU effective January 1, 2017 on a prospective basis. In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment, which eliminates Step 2 from the goodwill impairment test. Instead, under this amendment, an entity shall perform its annual, or interim, goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The ASU is effective for annual or any interim goodwill impairment tests beginning in fiscal years after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The adoption of this standard would only have an effect on the Company’s consolidated financial statements if it failed Step 1 of the goodwill impairment test, which has not occurred to date. In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation , Scope of Modification Accounting, which requires entities to apply modification accounting guidance when there are changes in the terms or conditions of a share-based payment award unless all of the following conditions are met: (i) the fair value of the modified award is the same as the fair value of the original award immediately before modification, (ii) the vesting conditions of the modified award are the same as the original award immediately before modification, and (iii) the classification of the modified award is the same as the original award immediately before modification. The Company early adopted the new ASU effective April 1, 2017, on a prospective basis.

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value Measurement	Fair Value Measurement At June 30, 2017 and December 31, 2016 , the carrying value of receivables, accounts payable, accrued expenses and distributions payable to noncontrolling interests approximates fair value due to their short-term nature. The carrying values and fair values of debt instruments are as follows (in thousands): June 30, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Lines of credit $ 486,300 $ 486,300 $ 489,200 $ 489,200 Syndicated term loans 309,713 309,713 189,989 189,989 Bank term loans 94,040 93,380 81,307 80,542 Note payable 38,328 38,459 36,232 35,396 Solar asset-backed notes 98,851 104,323 101,295 102,869 Total $ 1,027,232 $ 1,032,175 $ 898,023 $ 897,996 At June 30, 2017 and December 31, 2016 , the fair value of the Company’s lines of credit, syndicated term loans and certain bank term loans approximate their carrying values because their interest rates are variable rates that approximate rates currently available to the Company. At June 30, 2017 and December 31, 2016 , the fair value of the Company’s other debt instruments are based on rates currently offered for debt with similar maturities and terms. The Company’s fair value of the debt instruments fell under the Level 3 hierarchy. These valuation approaches involve some level of management estimation and judgment, the degree of which is dependent on the price transparency for the instruments or market. The Company determines the fair value of its interest rate swaps using a discounted cash flow model which incorporates an assessment of the risk of non-performance by the interest rate swap counterparty and an evaluation of the Company’s credit risk in valuing derivative instruments. The valuation model uses various inputs including contractual terms, interest rate curves, credit spreads and measures of volatility. The Company determines the fair value of its warrants issued using the Black-Scholes option-pricing model. The significant unobservable input used in the fair value measurement of the warrant liability was the expected volatility of the Company. Generally, increases (decreases) in the expected volatility of the Company would result in a directionally similar impact to the measurement of the Company’s warrants. At June 30, 2017 and December 31, 2016 , financial instruments measured at fair value on a recurring basis, based upon the fair value hierarchy are as follows (in thousands): June 30, 2017 Level 1 Level 2 Level 3 Total Derivative assets: Interest rate swaps $ — $ 5,059 $ — $ 5,059 Total $ — $ 5,059 $ — $ 5,059 Derivative liabilities: Warrants $ — $ — $ 7 $ 7 Total $ — $ — $ 7 $ 7 December 31, 2016 Level 1 Level 2 Level 3 Total Derivative assets: Interest rate swaps $ — $ 1,632 $ — $ 1,632 Total $ — $ 1,632 $ — $ 1,632 Derivative liabilities: Warrants $ — $ — $ 20 $ 20 Total $ — $ — $ 20 $ 20

Inventories

Inventories	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Inventories	Inventories Inventories consist of the following (in thousands): June 30, 2017 December 31, 2016 Raw materials $ 48,681 $ 62,037 Work-in-process 4,063 5,289 Total $ 52,744 $ 67,326

Solar Energy Systems, Net

Solar Energy Systems, Net	6 Months Ended
	Jun. 30, 2017
Solar Energy Systems Disclosure [Abstract]
Solar Energy Systems, Net	Solar Energy Systems, net Solar energy systems, net consists of the following (in thousands): June 30, 2017 December 31, 2016 Solar energy system equipment costs $ 2,793,188 $ 2,459,856 Inverters 287,833 260,011 Initial direct costs 134,325 117,587 Total solar energy systems 3,215,346 2,837,454 Less: accumulated depreciation and amortization (359,288 ) (303,305 ) Add: construction-in-progress 95,202 95,217 Total solar energy systems, net $ 2,951,260 $ 2,629,366 All solar energy systems, construction-in-progress and inverters have been leased to or are subject to signed Customer Agreements with customers. The Company recorded depreciation expense related to solar energy systems of $29.2 million and $22.5 million for the three months ended June 30, 2017 and 2016 , respectively, and $56.8 million and $42.9 million for the six months ended June 30, 2017 and 2016 , respectively. The depreciation expense was reduced by the amortization of deferred grants of $1.8 million and $3.4 million for the three months ended June 30, 2017 and 2016 , respectively, and $3.8 million and $7.4 million for the six months ended June 30, 2017 and 2016 , respectively.

Indebtedness

Indebtedness	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Indebtedness	Indebtedness As of June 30, 2017 , debt consisted of the following (in thousands, except percentages): Carrying Values, net of debt discount Unused Borrowing Capacity Annual Contractual Interest Rate Interest Rate Maturity Date Current Long Term Total Recourse debt: Bank line of credit $ 247,000 $ — $ 247,000 $ 406 Varies (1) 4.33% - 4.46% April 2018 Total recourse debt $ 247,000 $ — $ 247,000 $ 406 Non-recourse debt: Term loan — 121,532 121,532 12 Varies (2) 3.74% - 3.97% April 2024 Line of credit (Aggregation Facility) — 239,300 239,300 8,500 Varies (3) 3.67% - 3.72% December 2020 Term Loan and Term Loan B 2,606 39,553 42,159 — Varies (4) 6.17 % December 2020 and 2021 Term Loan A 568 145,454 146,022 5,000 Varies (5) 3.92 % December 2021 Bank term loans 1,530 32,307 33,837 — LIBOR + 2.25% 3.48 % September 2022 LIBOR + 3.00% 4.30 % September 2022 Bank term loan 8,929 24,507 33,436 — Varies (6) 6.70% - 10.20% July 2021 Bank term loan 1,402 25,365 26,767 — 4.50 % 4.50 % April 2022 Solar asset-backed notes 3,848 95,003 98,851 — 4.40% - Class A 4.40 % July 2024 5.38% - Class B 5.38 % July 2024 Note payable — 38,328 38,328 — 12.00 % 12.00 % December 2018 Total non-recourse debt 18,883 761,349 780,232 13,512 Total debt $ 265,883 $ 761,349 $ 1,027,232 $ 13,918 As of December 31, 2016 , debt consisted of the following (in thousands, except percentages): Carrying Values, net of debt discount Unused Borrowing Capacity Annual Contractual Interest Rate Interest Rate Maturity Date Current Long Term Total Recourse debt: Bank line of credit $ — $ 244,000 $ 244,000 $ 3,406 Varies (1) 3.96% - 5.75% April 2018 Total recourse debt $ — $ 244,000 $ 244,000 $ 3,406 Non-recourse debt: Line of credit (Aggregation Facility) — 245,200 245,200 9,300 Varies (3) 2.93% - 3.39% December 2020 Term Loan and Term Loan B 116 42,870 42,986 — Varies (4) 6.00 % December 2020 December 2021 Term Loan A 616 146,387 147,003 5,000 Varies (5) 3.64 % December 2021 Bank term loan 1,074 21,249 22,323 — LIBOR + 2.25% 2.86 % September 2022 Bank term loan 7,286 23,802 31,088 1,032 Varies (6) 6.25% - 9.94% July 2021 Bank term loan 1,331 26,565 27,896 — 4.50 % 4.50 % April 2022 Solar asset-backed notes 3,730 97,565 101,295 — 4.40% - Class A 4.40 % July 2024 5.38% - Class B 5.38 % July 2024 Note payable — 36,232 36,232 — 12.00 % 12.00 % December 2018 Total non-recourse debt 14,153 639,870 654,023 15,332 Total debt $ 14,153 $ 883,870 $ 898,023 $ 18,738 (1) Loans under the facility bear interest at LIBOR +3.25% per annum or the Base Rate +2.25% per annum. The Base Rate is the highest of the Federal Funds Rate +0.50% , the Prime Rate, or LIBOR +1.00% . (2) Loans under the facility bear interest at LIBOR +2.75% per annum for the initial four -year period for LIBOR loans or the Base Rate +1.75% per annum for Base Rate Loans. (3) Loans under the facility bear interest at LIBOR +2.50% per annum for the initial three -year revolving availability period, stepping up to LIBOR +2.75% per annum in the following two -year period. (4) Term loan under the facility bears interest at LIBOR +5.00% per annum for the first three -year period, stepping up to LIBOR +6.50% per annum thereafter. Term loan B under the facility bears interest at LIBOR +5.00% per annum. (5) Loan under the facility bears interest at LIBOR +2.75% per annum, stepping up to LIBOR +3.00% per annum on the fourth anniversary. (6) Loans under the facility bear interest at LIBOR +5.50% per annum for contracted SRECs and LIBOR +9.00% per annum for uncontracted SRECs. Bank Line of Credit The Company has outstanding borrowings under a syndicated working capital facility with banks for a total commitment of up to $250.0 million . The working capital facility is secured by substantially all of the unencumbered assets of the Company, as well as ownership interests in certain subsidiaries of the Company. Under the terms of the working capital facility, the Company is required to meet various restrictive covenants, such as the completion and presentation of audited consolidated financial statements, maintaining a minimum unencumbered liquidity of at least $25.0 million in the aggregate as of the last day of each calendar month and maintaining a modified interest coverage ratio of 2.00 or greater, measured quarterly as of the last day of each quarter. The Company was in compliance with all debt covenants as of June 30, 2017 . As of June 30, 2017 , the balance under this facility was $247.0 million with a maturity date in April 2018 . As of June 30, 2017 , the Company’s cash balance was $211.3 million and as such, the Company does not currently have the funds required to fully repay the debt. As this facility has a three year term, the Company is in the process of negotiating refinancing options and plans to extend the maturity date of the facility. Although there is no assurance that the Company will be able to do so, the Company believes that it is probable that it will be able to extend or otherwise refinance the facility prior to maturity. Syndicated Credit Facilities Each of the Company's syndicated credit facilities contain customary covenants including the requirement to maintain certain financial measurements and provide lender reporting. Each of the syndicated credit facilities also contain certain provisions in the event of default which entitle lenders to take certain actions including acceleration of amounts due under the facilities and acquisition of membership interests and assets that are pledged to the lenders under the terms of the credit facilities. The Company was in compliance with all debt covenants as of June 30, 2017 . Term loan due in April 2024 In May 2017, a subsidiary of the Company entered into an arrangement for senior secured credit facilities that was syndicated with various lenders. The credit facilities totaled $202.0 million and consisted of a $195.0 million delayed draw term loan facility and a $7.0 million revolving debt service reserve letter of credit facility. The amount outstanding at June 30, 2017 was $121.5 million . The facilities are non-recourse to the Company and are secured by net cash flows from Customer Agreements and solar renewable energy credits ("SRECs"), less certain operating, maintenance and other expenses which are available to the borrower after distributions to tax equity investors. Prepayments are permitted under the delayed draw term loan facility. Line of credit (Aggregation Facility) and Term Loan As of June 30, 2017 , certain subsidiaries of the Company have an outstanding balance of $261.8 million on secured credit facilities agreements, as amended, with a syndicate of banks. The facilities include a revolving aggregation facility (“Aggregation Facility”), a term loan (“Term Loan”) and a revolving debt service reserve letter of credit facility. The facilities are non-recourse to the Company and are secured by net cash flows of certain subsidiaries from Customer Agreements, less certain operating, maintenance and other expenses which are available to the borrowers after distributions to tax equity investors. Term Loan prepayment penalties range from 0% - 1% depending on the timing of the prepayment. Term Loan A and Term Loan B As of June 30, 2017 , certain subsidiaries of the Company have an outstanding balance of $165.7 million on secured credit facilities agreements with a syndicate of banks. These facilities include a senior term loan (“Term Loan A”) and a subordinated term loan (“Term Loan B”). In addition, the credit facilities also include a working capital revolver commitment and a revolving debt service reserve letter of credit facility which draws are solely for the purpose of satisfying the required debt service reserve amount if necessary. The facilities are non-recourse to the Company and are secured by net cash flows of certain subsidiaries from Customer Agreements, less certain operating, maintenance and other expense which are available to the borrowers after distributions to tax equity investors. Prepayments are permitted under Term Loan A and Term Loan B at par without premium or penalty. Bank Term Loans Bank term loans due in September 2022 As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $12.8 million on a non-recourse loan. The loan is secured by substantially all of the assets of a subsidiary including this subsidiary’s membership interests and assets in its investment funds. The loan contains certain provisions in the event of default which entitles the lender to take certain actions including acceleration of amounts due under the loan. The Company was in compliance with all debt covenants as of June 30, 2017 . As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $21.0 million on a secured, non-recourse loan agreement. The loan will be repaid through cash flows from a lease pass-through arrangement previously entered into by the Company. The loan agreement contains customary covenants including the requirement to maintain certain financial measurements and provide lender reporting. The loan also contains certain provisions in the event of default which entitles the lender to take certain actions including acceleration of amounts due under the loan. The Company was in compliance with all debt covenants as of June 30, 2017 . Bank term loan due in July 2021 As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $33.4 million on a secured credit agreement. The facility is non-recourse to the Company and is secured by substantially all of the assets of the subsidiary, including its rights in and the net cash flows from the generation of contracted and uncontracted SRECs by certain subsidiaries. The facility contains customary covenants including the requirement to provide lender reporting. The Company guarantees the delivery of SRECs on the subsidiary’s underlying contracts in the event of a delivery shortfall pursuant to the SREC contracts with counterparties. The Company does not guarantee payments of principal or interest on the loan. The credit facility also contains certain provisions in the event of default which entitles the lender to take certain actions including acceleration of amounts due under the facilities. The Company was in compliance with all debt covenants as of June 30, 2017 . Bank term loan due in April 2022 As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $26.8 million on a term loan. The loan is secured by the assets and related cash flow of this subsidiary and is non-recourse to the Company’s other assets. The Company was in compliance with all debt covenants as of June 30, 2017 . Solar Asset-Backed Notes As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $98.9 million on solar asset-backed notes ("Notes") secured by associated customer contracts (“Solar Assets”) held by a special purpose entity (“Issuer”). As of June 30, 2017 and December 31, 2016 , these Solar Assets had a carrying value of $177.4 million and $181.8 million , respectively, and are included under solar energy systems, net, in the consolidated balance sheets. The Notes were issued at a discount of 0.08% . In connection with the transaction, the Company modified two lease pass-through arrangements with an investor. The modified lease-pass through arrangements require the majority of the cash flows generated by the Solar Assets to be passed on to the Issuer through monthly lease payments from the Fund investor. Those cash flows are used to service the monthly principal of the Notes and interest payments and satisfy the Issuer’s expenses, and any residual cash flows are retained by the Fund investor and recorded as a reduction in the remaining financing obligation. The Company recognizes revenue earned from the associated Customer Agreements in accordance with the Company’s revenue recognition policy. The assets and cash flows generated by the Solar Assets are not available to the other creditors of the Company, and the creditors of the Issuer, including the Note holders, have no recourse to the Company’s other assets. The Company was in compliance with all debt covenants as of June 30, 2017 . Notes Payable As of June 30, 2017 , a subsidiary of the Company has an outstanding balance of $38.3 million on a note purchase agreement with an investor for the issuance of senior notes. On the last business day of each quarter, commencing with March 31, 2014, to the extent the Company’s subsidiary has insufficient funds to pay the full amount of the stated interest of the outstanding loan balance, a payment-in-kind (“PIK”) interest rate of 12% is accrued and added to the outstanding balance. As of June 30, 2017 and December 31, 2016 , the portion of the outstanding loan balance that related to PIK interest was $11.5 million and $9.5 million , respectively. The senior notes are secured by the assets and related cash flows of certain of the Company’s subsidiaries and are non-recourse to the Company’s other assets. The Company was in compliance with all debt covenants as of June 30, 2017 .

Derivatives

Derivatives	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivatives	Derivatives Interest Rate Swaps The Company uses interest rate swaps to hedge variable interest payments due on certain of its term loans and aggregation facility. These swaps allow the Company to incur fixed interest rates on these loans and receive payments based on variable interest rates with the swap counterparty based on the one or three month LIBOR on the notional amounts over the life of the swaps. The interest rate swaps have been designated as cash flow hedges. The credit risk adjustment associated with these swaps is the risk of non-performance by the counterparties to the contracts. In the six months ended June 30, 2017 , the hedge relationships on the Company’s interest rate swaps have been assessed as highly effective as the critical terms of the interest rate swaps match the critical terms of the underlying forecasted hedged transactions. Accordingly, changes in the fair value of these derivatives are recorded as a component of accumulated other comprehensive income, net of income taxes. Changes in the fair value of these derivatives are subsequently reclassified into earnings, and are included in interest expense, net in the Company’s statements of operations, in the period that the hedged forecasted transactions affects earnings. The Company recorded an unrealized loss of $3.7 million and $4.5 million for the three and six months ended June 30, 2017 respectively, net of applicable tax benefit of $2.4 million and $2.9 million , respectively. The Company recorded an unrealized gain of $0.2 million and an unrealized loss of $5.6 million for the three and six months ended June 30, 2016 respectively, net of applicable tax benefit of $3.6 million for the three and six months ended June 30, 2016 . The Company recognized interest expense on derivatives into earnings of $0.3 million and $0.9 million for the three and six months ended June 30, 2017 , respectively, net of tax expense of $0.2 million and $0.6 million , respectively. The Company recognized interest expense on derivatives into earnings of $0.1 million and $0.6 million for the three and six months ended June 30, 2016 , respectively, net of tax benefit of $0.4 million for the three and six months ended June 30, 2016 . During the next twelve months, the Company estimates that an additional $2.1 million will be reclassified as an increase to interest expense. There were no undesignated derivative instruments recorded by the Company as of June 30, 2017 . At June 30, 2017 , the Company had designated derivative instruments classified as derivative assets as reported in other assets of $0.3 million and derivative liabilities as reported in other liabilities of $5.3 million in the Company’s balance sheet. At December 31, 2016 , the Company had designated derivative instruments classified as derivative assets as reported in other assets of $1.6 million in the Company’s balance sheet. At June 30, 2017 , the Company had the following derivative instruments (in thousands, other than quantity and interest rates): Type Quantity Maturity Dates Hedge Interest Rates Notional Amount Fair Market Value Interest rate swap 1 8/31/2022 1.27% - 1.29% $ 16,563 $ 315 Interest rate swap 1 9/30/2022 2.37% $ 12,610 $ (243 ) Interest rate swaps 4 4/30/2024 2.16% - 2.25% $ 96,544 $ (909 ) Interest rate swaps 2 10/31/2024 2.62% - 2.69% $ 62,633 $ (1,297 ) Interest rate swaps 4 10/31/2028 2.17% - 2.18% $ 125,100 $ (43 ) Interest rate swap 1 9/30/2031 3.23% $ 9,905 $ (231 ) Interest rate swaps 5 7/31/2034 2.48% - 3.04% $ 144,379 $ (1,223 ) Interest rate swaps 5 7/31/2035 2.56% - 2.95% $ 132,432 $ (1,428 )

Lease Pass-Through Financing Ob

Lease Pass-Through Financing Obligations	6 Months Ended
	Jun. 30, 2017
Property Subject to or Available for Operating Lease, Net [Abstract]
Lease Pass-Through Financing Obligations	Lease Pass-Through Financing Obligations The Company has five ongoing transactions referred to as “lease pass-through arrangements.” Under lease pass-through arrangements, the Company leases solar energy systems to Fund investors under a master lease agreement, and these investors in turn are assigned the leases with customers. The Company receives all of the value attributable to the accelerated tax depreciation and some or all of the value attributable to the other incentives. The Company assigns to the Fund investors the value attributable to the investment tax credit (“ITC”) and, for the duration of the master lease term, the long-term recurring customer payments. Given the assignment of the operating cash flows, these arrangements are accounted for as financing obligations. In addition, in one of the lease pass-through structures, the Company sold, as well as leased, solar energy systems to a Fund investor under a master purchase agreement. As the substantial risks and rewards in the underlying solar energy systems were retained by the Company, this arrangement was also accounted for as a financing obligation. Under these lease pass-through arrangements, wholly owned subsidiaries of the Company finance the cost of solar energy systems with investors for an initial term of 20 – 25 years. The solar energy systems are subject to Customer Agreements with an initial term not exceeding 20 years. These solar energy systems are reported under the line item solar energy systems, net in the consolidated balance sheets. As of June 30, 2017 and December 31, 2016 , the cost of the solar energy systems placed in service under the lease pass-through arrangements was $494.0 million and $494.9 million , respectively. The accumulated depreciation related to these assets as of June 30, 2017 and December 31, 2016 was $59.8 million and $50.8 million , respectively. In 2015, the Company entered into a lease pass-through arrangement and in connection with this arrangement, the Company agreed to defer a portion (up to 25% ) of the amounts required to be paid upfront under the arrangement through a loan between an indirect wholly owned subsidiary of the Company and a subsidiary of the Fund investor. The loan is collateralized by the related cash flows assigned to the Fund investor. There is a legal right to offset the loan if an event of default has occurred. Therefore, the lease pass-through financing obligation related to this arrangement is recorded net of the loan. As of June 30, 2017 and December 31, 2016 , the loan amount was $21.9 million and $23.2 million , respectively.

VIE Arrangements

VIE Arrangements	6 Months Ended
	Jun. 30, 2017
Variable Interest Entity Disclosure [Abstract]
VIE Arrangements	VIE Arrangements The Company consolidated various VIEs at June 30, 2017 and December 31, 2016 . The carrying amounts and classification of the VIEs’ assets and liabilities included in the consolidated balance sheets are as follows (in thousands): June 30, 2017 December 31, 2016 Assets Current assets Cash $ 108,039 $ 120,728 Restricted cash 3,574 1,680 Accounts receivable, net 27,547 20,771 Prepaid expenses and other current assets 235 242 Total current assets 139,395 143,421 Solar energy systems, net 2,237,670 1,920,330 Other assets 2,159 1,481 Total assets $ 2,379,224 $ 2,065,232 Liabilities Current liabilities Accounts payable $ 22,196 $ 14,873 Distributions payable to noncontrolling interests and redeemable noncontrolling interests 13,213 10,654 Accrued expenses and other liabilities 1,471 782 Deferred revenue, current portion 27,468 25,827 Deferred grants, current portion 3,623 3,644 Long-term non-recourse debt, current portion 10,331 8,616 Total current liabilities 78,302 64,396 Deferred revenue, net of current portion 416,635 396,858 Deferred grants, net of current portion 103,310 105,390 Long-term non-recourse debt, net of current portion 161,689 50,367 Other liabilities 2,337 — Total liabilities $ 762,273 $ 617,011 The Company holds a variable interest in an entity that provides the noncontrolling interest with a right to terminate the leasehold interests in all of the leased projects on the tenth anniversary of the effective date of the master lease. In this circumstance, the Company would be required to pay the noncontrolling interest an amount equal to the fair market value, as defined in the governing agreement of all leased projects as of that date. The Company holds certain variable interests in nonconsolidated VIEs established as a result of five lease pass-through Fund arrangements as further explained in Note 8 , Lease Pass-Through Financing Obligations . The Company does not have material exposure to losses as a result of its involvement with the VIEs in excess of the amount of the financing liability recorded in the Company’s consolidated financial statements. The Company is not considered the primary beneficiary of the VIEs.

Redeemable Noncontrolling Inter

Redeemable Noncontrolling Interests and Equity	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Redeemable Noncontrolling Interests and Equity	Redeemable Noncontrolling Interests and Equity The changes in redeemable noncontrolling interests, total stockholders’ equity and noncontrolling interests were as follows (in thousands): Redeemable Noncontrolling Interests Total Stockholders' Equity Noncontrolling Interests Total Equity Balance — January 1, 2017 $ 137,907 $ 672,961 $ 251,225 $ 924,186 Exercise of stock options — 529 — 529 Issuance of restricted stock units, net of tax withholdings — (2,099 ) — (2,099 ) Shares issued in connection with the Employee Stock Purchase Plan — 1,145 — 1,145 Stock based compensation — 11,416 — 11,416 Contributions from noncontrolling interests and redeemable noncontrolling interests 75,169 — 231,123 231,123 Distributions to noncontrolling interests and redeemable noncontrolling interests (7,666 ) — (19,527 ) (19,527 ) Cumulative effect of adoption of new ASUs — 2,996 — 2,996 Net income (loss) (42,333 ) 37,848 (133,842 ) (95,994 ) Other comprehensive loss, net of taxes — (3,569 ) — (3,569 ) Balance — June 30, 2017 $ 163,077 $ 721,227 $ 328,979 $ 1,050,206 The carrying value of redeemable noncontrolling interests was greater than the redemption value except for six and four Funds at June 30, 2017 and December 31, 2016 , respectively, where the carrying value has been adjusted to the redemption value.

Stock-Based Compensation

Stock-Based Compensation	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Stock-Based Compensation	Stock-Based Compensation Stock Options The following table summarizes the activity for all stock options under all of the Company’s equity incentive plans for the six months ended June 30, 2017 (shares and aggregate intrinsic value in thousands): Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life Aggregate Intrinsic Value Outstanding at January 1, 2017 12,897 $ 5.94 7.49 Granted 4,585 5.03 Exercised (207 ) 2.49 Cancelled (524 ) 7.82 Outstanding at June 30, 2017 16,751 $ 5.68 7.75 $ 32,028 Options vested and exercisable at June 30, 2017 7,961 $ 5.40 6.34 $ 18,378 Restricted Stock Units The following table summarizes the activity for all restricted stock units (“RSUs”) under all of the Company’s equity incentive plans for the six months ended June 30, 2017 (shares in thousands): Number of Awards Weighted Average Grant Date Fair Value Unvested balance at January 1, 2017 4,106 $ 6.87 Granted 2,887 5.10 Issued (538 ) 6.15 Forfeited (644 ) 5.79 Unvested balance at June 30, 2017 5,811 $ 6.13 Employee Stock Purchase Plan In the quarter ended June 30, 2017 , the Company modified the Company's 2015 Employee Stock Purchase Plan ("ESPP") by increasing the offering period to 24 months with four six month purchase periods and increasing the maximum number of shares an eligible employee can purchase during a purchase period to 10,000 shares. Each purchase period begins on the first trading day on or after May 15 and November 15 of each year. Employees may purchase a limited number of shares of the Company’s common stock via regular payroll deductions at a discount of 15% of the lower of the fair market value of the Company’s common stock on the first trading date of each offering period or on the exercise date. Employees may deduct up to 15% of payroll, with a cap of $25,000 of fair market value of shares in any calendar year. Stock-Based Compensation Expense The Company recognized stock-based compensation expense, including ESPP expenses, in the consolidated statements of operations as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Cost of operating leases and incentives $ 1,110 $ 632 $ 1,861 $ 839 Cost of solar energy systems and product sales 156 117 270 198 Sales and marketing 807 1,890 2,724 3,508 Research and development 186 149 335 246 General and administration 3,256 2,050 6,199 3,856 Total $ 5,515 $ 4,838 $ 11,389 $ 8,647

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The income tax expense rate for the three and six months ended June 30, 2017 was (31.0)% and (19.7)% , respectively. The income tax expense rate for the three and six months ended June 30, 2016 was (5.2)% and (2.3)% , respectively, The differences between the actual consolidated effective income tax rate and the U.S. federal statutory rate were primarily attributable to the allocation of losses on noncontrolling interests and redeemable noncontrolling interests, which assumes a hypothetical liquidation of these partnerships as of the reporting dates. The Company sells solar energy systems to investment Funds. As the investment Funds are consolidated by the Company, the gain on the sale of the assets has been eliminated in the consolidated financial statements. These transactions are treated as intercompany sales and any tax expense incurred related to these sales prior to fiscal year 2017 was deferred. As described in Note 2 , Summary of Significant Accounting Policies – Recently Issued Accounting Standards, ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory , requires entities to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. As a result, a reporting entity would recognize the tax expense from the sale of assets in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in the consolidated financial statements. Any deferred tax asset that arises in the buyer’s jurisdiction would also be recognized at the time of the transfer. As the Company sells solar energy systems to Funds, the Company will record the current tax effect of the gain on the sale as well as a deferred tax asset related to the Company’s increased tax basis in the partnership as a result of the sale. As a result of the adoption of ASU 2016-16, the Company recognized in retained earnings the reversal of the net prepaid tax assets of $378.5 million previously recorded for the tax deferral, and recognized gross a deferred tax asset of $378.2 million at January 1, 2017. The Company adopted ASU 2016-09, Compensation – Stock Compensation (Topic 718): Improvements to Employee Share-Based Payment Accounting , on January 1, 2017. As a result of the adoption, the Company has increased its federal and state deferred tax assets by $3.3 million for the cumulative unrecognized federal and state gross windfall net operating loss carryover at December 31, 2016 of $8.6 million and $6.8 million , respectively, with an offsetting adjustment to retained earnings of $3.3 million . Uncertain Tax Positions As of June 30, 2017 and December 31, 2016 , the Company had $1.5 million of unrecognized tax benefits related to an acquisition in 2015. In addition, there was $0.4 million and $0.3 million of interest and penalties for uncertain tax positions as of June 30, 2017 and December 31, 2016 , respectively. The Company does not have any tax positions for which it is reasonably possible that the total amount of gross unrecognized benefits will increase or decrease within the next 12 months. The Company is subject to taxation and files income tax returns in the United States, and various state and local jurisdictions. Due to the Company’s net losses, substantially all of its federal, state and local income tax returns since inception are still subject to audit. Net Operating Loss Carryforwards As a result of the Company’s net operating loss carryforwards as of June 30, 2017 and December 31, 2016 , the Company does not expect to pay income tax, including in connection with its income tax provision for the six months ended June 30, 2017 until the Company’s net operating losses are fully utilized. As of December 31, 2016 , the Company’s federal and state net operating loss carryforwards were $571.3 million and $524.9 million , respectively. If not utilized, the federal net operating loss will begin to expire in the year 2028 and the state net operating losses will begin to expire in the year 2024 .

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Letters of Credit As of June 30, 2017 and December 31, 2016 , the Company had $11.2 million and $6.2 million , respectively, of unused letters of credit outstanding, which carry fees of 2.50% - 3.00% per annum and 2.50% per annum, respectively. Non-cancellable Operating Leases The Company leases facilities and equipment under non-cancellable operating leases. Total operating lease expenses were $3.2 million and $2.9 million for the three months ended June 30, 2017 and 2016 , respectively, and $6.3 million and $5.6 million for the six months ended June 30, 2017 and 2016 , respectively. Certain operating leases contain rent escalation clauses, which are recorded on a straight-line basis over the initial term of the lease with the difference between the rent paid and the straight-line rent recorded as a deferred rent liability. Lease incentives received from landlords are recorded as deferred rent liabilities and are amortized on a straight-line basis over the lease term as a reduction to rent expense. Deferred rent liabilities were $2.7 million and $2.9 million as of June 30, 2017 and December 31, 2016 , respectively. Capital Lease Obligations As of June 30, 2017 and December 31, 2016 , capital lease obligations were $17.3 million and $23.0 million , respectively. The capital lease obligations bear interest at rates up to 10% per annum. Warranty Accrual The Company accrues warranty costs when revenue is recognized for solar energy systems sales, based on the estimated future costs of meeting its warranty obligations. Warranty costs primarily consist of replacement costs for supplies and labor costs for service personnel since warranties for equipment and materials are covered by the original manufacturer’s warranty (other than a small deductible in certain cases). As such, the warranty reserve is immaterial in all periods presented. The Company makes and revises these estimates based on the number of solar energy systems under warranty, the Company’s historical experience with warranty claims, assumptions on warranty claims to occur over a systems’ warranty period and the Company’s estimated replacement costs. Guarantees The Company guarantees one of its investors in one of its Funds an internal rate of return, calculated on an after-tax basis, in the event that it purchases the investor’s interest or the investor sells its interest to the Company. The Company does not expect the internal rate of return to fall below the guaranteed amount; however, due to uncertainties associated with estimating the timing and amount of distributions to the investor and the possibility for and timing of the liquidation of the Fund, the Company is unable to determine the potential maximum future payments that it would have to make under this guarantee. ITC and Cash Grant Indemnification The Company is contractually committed to compensate certain investors for any losses that they may suffer in certain limited circumstances resulting from reductions in ITCs or U.S. Treasury grants. Generally, such obligations would arise as a result of reductions to the value of the underlying solar energy systems as assessed by the Internal Revenue Service (the “IRS”) or U.S. Treasury Department. At each balance sheet date, the Company assesses and recognizes, when applicable, the potential exposure from this obligation based on all the information available at that time, including any audits undertaken by the IRS. The Company believes that this obligation is not probable based on the facts known as of the filing date of this Quarterly Report on Form 10-Q. The maximum potential future payments that the Company could have to make under this obligation would depend on the difference between the fair values of the solar energy systems sold or transferred to the Funds as determined by the Company and the values the IRS would determine as the fair value for the systems for purposes of claiming ITCs. ITCs are claimed based on the statutory regulations from the IRS. The Company uses fair values determined with the assistance of an independent third-party appraisal as the basis for determining the ITCs that are passed-through to and claimed by the Fund investors. Since the Company cannot determine how the IRS will evaluate system values used in claiming ITCs, the Company is unable to reliably estimate the maximum potential future payments that it could have to make under this obligation as of each balance sheet date. Litigation The Company is subject to certain legal proceedings, claims, investigations and administrative proceedings in the ordinary course of its business. The Company records a provision for a liability when it is both probable that the liability has been incurred and the amount of the liability can be reasonably estimated. These provisions, if any, are reviewed at least quarterly and adjusted to reflect the impacts of negotiations, settlements, rulings, advice of legal counsel and other information and events pertaining to a particular case. Depending on the nature and timing of any such proceedings that may arise, an unfavorable resolution of a matter could materially affect the Company’s future consolidated results of operations, cash flows or financial position in a particular period. In July 2012, the U.S. Treasury Department and the Department of Justice (together, the “Government”) opened a civil investigation into the participation by residential solar developers in the Section 1603 grant program. The Government served subpoenas on several developers, including Sunrun, along with their investors and valuation firms. The focus of the investigation is the claimed fair market value of the solar systems the developers submitted to the Government in their grant applications. The Company has cooperated fully with the Government and plans to continue to do so. No claims have been brought against the Company. The Company is not able to estimate the ultimate outcome or a range of possible loss at this point in time. On April 13, 2016, a purported shareholder class action captioned Pytel v. Sunrun Inc., et al. , Case No. CIV 538215, was filed in the Superior Court of California, County of San Mateo, against the Company, certain of the Company’s directors and officers, the underwriters of the Company’s initial public offering and certain other defendants. The complaint generally alleges that the defendants violated Sections 11, 12 and 15 of the Securities Act of 1933 by making false or misleading statements in connection with the Company’s August 5, 2015 initial public offering regarding the continuation of net metering programs. The plaintiffs seek to represent a class of persons who acquired the Company’s common stock pursuant or traceable to the initial public offering. Plaintiffs seek compensatory damages, including interest, rescission or rescissory damages, an award of reasonable costs and attorneys’ fees, and any equitable or injunctive relief deemed appropriate by the court. On April 21, 2016, a purported shareholder class action captioned Mancy v. Sunrun Inc., et al. , Case No. CIV 538303, was filed in the Superior Court of California, County of San Mateo. On April 22, 2016, a purported shareholder class action captioned Brown et al. v. Sunrun Inc., et al. , Case No. CIV 538311, was filed in the Superior Court of California, County of San Mateo. On April 29, 2016, a purported shareholder class action captioned Baker et al. v. Sunrun Inc., et al. , Case No. CIV 538419, was filed in the Superior Court of California, County of San Mateo. On May 10, 2016, a purported shareholder class action captioned Nunez v. Sunrun Inc., et al. , Case No. CIV 538593, was filed in the Superior Court of California, County of San Mateo. On June 10, 2016, a purported shareholder class action captioned Steinberg v. Sunrun Inc., et al. , Case No. 539064, was filed in the Superior Court of California, County of San Mateo. The Mancy , Brown , Baker, Nunez and Steinberg complaints are substantially similar to the Pytel complaint, and seek similar relief against similar defendants on behalf of the same purported class. On April 21, 2016, a purported shareholder class action captioned Cohen, et al. v. Sunrun Inc., et al. , Case No. CIV 538304, was filed in the Superior Court of California, County of San Mateo, against the Company, certain of the Company’s directors and officers, and the underwriters of the Company’s initial public offering. The complaint generally alleges that the defendants violated Sections 11, 12 and 15 of the Securities Act of 1933 by making false or misleading statements in connection with an August 5, 2015 initial public offering regarding the Company’s business practices and its dependence on complex financial instruments. The Cohen plaintiffs seek to represent the same class and seek similar relief as the plaintiffs in the Pytel , Mancy , Brown, Nunez, Steinberg and Baker actions. On September 26, 2016, the Baker, Brown, Cohen, Mancy, Nunez, Pytel and Steinberg actions were consolidated. On May 3, 2017, a purported shareholder class action captioned Fink, et al. v. Sunrun Inc., et al. , Case No. 3:17-cv-02537, was filed in the United States District Court, Northern District of California, against the Company and certain of the Company’s directors and officers. The complaint generally alleges that the defendants violated Sections 10(b) and 20(a) of the Exchange Act of 1934, and Securities and Exchange Commission Rule 10b-5, by making false or misleading statements in connection with public filings made between September 15, 2015 and March 8, 2017 regarding the number of customers who canceled contracts after signing up for the Company’s home-solar energy system. The plaintiff seeks compensatory damages, including interest, attorney's fees, and costs, on behalf of all persons other than the defendants who purchased the Company's securities between September 16, 2015 and May 2, 2017. On May 4, 2017, a purported shareholder class action captioned Hall, et al. v. Sunrun Inc., et al. , Case No. 3:17-cv-02571, was filed in the United States District Court, Northern District of California. On May 18, 2017, a purported shareholder class action captioned Sanogo, et al. v. Sunrun Inc., et al ., Case No. 3:17-cv-02865, was filed in the United States District Court, Northern California District of California. The Hall and Sanogo complaints are substantially similar to the Fink complaint, and seeks similar relief against similar defendants on behalf of a substantially similar class. On June 29, 2017, a shareholder derivative complaint captioned Barbara Sue Sklar Living Trust v. Sunrun Inc. et al ., was filed in the United States District Court, Northern District of California, against the Company and certain of the Company’s directors and officers. The complaint generally alleges that the defendants violated Section 14(a) of the Exchange Act of 1934 by making false or misleading statements in connection with public filings, including proxy statements, made between September 10, 2015 and May 3, 2017 regarding the number of customers who cancelled contracts after signing up for the Company’s home solar energy system. The Plaintiff seeks, among other things, damages in favor of the Company, certain corporate actions to purportedly improve the Company’s corporate governance, and an award of costs and expenses to the putative plaintiff stockholder, including attorneys’ fees.

Earnings Per Share

Earnings Per Share	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Earnings Per Share	Earnings Per Share The computation of the Company’s basic and diluted net income per share are as follows (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Net income attributable to common stockholders $ 25,122 $ 32,643 $ 37,849 $ 45,777 Denominator: Weighted average shares used to compute net income per share attributable to common stockholders, basic 105,093 101,969 104,568 101,621 Weighted average effect of potentially dilutive shares to purchase common stock 2,254 2,799 2,343 2,873 Weighted average shares used to compute net income per share attributable to common stockholders, diluted 107,347 104,768 106,911 104,494 Net income per share attributable to common stockholders Basic $ 0.24 $ 0.32 $ 0.36 $ 0.45 Diluted $ 0.23 $ 0.31 $ 0.35 $ 0.44 The following shares were excluded from the computation of diluted net income per share as the impact of including those shares would be anti-dilutive (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Warrants 1,251 1,251 1,251 1,251 Outstanding stock options 13,712 8,060 13,712 8,060 Unvested restricted stock units 1,256 1,328 1,256 1,328 Total 16,219 10,639 16,219 10,639

Related Party Transactions

Related Party Transactions	6 Months Ended
	Jun. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions An individual who previously served as one of the Company’s directors until March 2017 has direct and indirect ownership interests in Enphase Energy, Inc. (“Enphase”). For the three months ended June 30, 2017 and 2016 , the Company recorded $3.0 million and $1.4 million , respectively, and $4.4 million and $14.4 million for the six months ended June 30, 2017 and 2016 , respectively, in purchases from Enphase and had outstanding payables to Enphase of $2.7 million and $0.4 million as of June 30, 2017 and December 31, 2016 , respectively.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Basis of Presentation and Principles of Consolidation	Basis of Presentation and Principles of Consolidation The accompanying unaudited consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“GAAP”) and applicable rules and regulations of the Securities and Exchange Commission 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 consolidated financial statements and accompanying notes included in the Company’s annual report on Form 10-K for the year ended December 31, 2016 . The unaudited consolidated financial statements are prepared on the same basis as the audited consolidated financial statements and, in the opinion of management, reflect all adjustments (all of which are considered of normal recurring nature) considered necessary to present fairly the Company’s financial results. The results of the six months ended June 30, 2017 are not necessarily indicative of the results to be expected for the fiscal year ending December 31, 2017 or other future periods. The consolidated financial statements reflect the accounts and operations of the Company and those of its subsidiaries, including Funds, in which the Company has a controlling financial interest. The typical condition for a controlling financial interest ownership is holding a majority of the voting interests of an entity. However, a controlling financial interest may also exist in entities, such as variable interest entities (“VIEs”), through arrangements that do not involve controlling voting interests. In accordance with the provisions of Financial Accounting Standards Board (“FASB”) Accounting Standards Codification Topic 810 (“ASC 810”) Consolidation , the Company consolidates any VIE of which it is the primary beneficiary. The primary beneficiary, as defined in ASC 810, is the party that has (1) the power to direct the activities of a VIE that most significantly impact the VIE’s economic performance and (2) the obligation to absorb the losses of the VIE or the right to receive benefits from the VIE that could potentially be significant to the VIE. The Company evaluates its relationships with its VIEs on an ongoing basis to determine whether it continues to be the primary beneficiary. The consolidated financial statements reflect the assets and liabilities of VIEs that are consolidated. All intercompany transactions and balances have been eliminated in consolidation.
Use of Estimates	Use of Estimates The preparation of the consolidated financial statements requires management to make estimates and assumptions that affect the amounts reported in the consolidated financial statements and accompanying notes. The Company regularly makes significant estimates and assumptions, including, but not limited to, the estimates that affect the collectability of accounts receivable, the valuation of inventories, the useful lives of solar energy systems, the useful lives of property and equipment, the valuation and useful lives of intangible assets, the fair value of assets acquired and liabilities assumed in business combinations, the effective interest rate used to amortize lease pass-through financing obligations, the fair value used to value solar energy systems, the valuation of stock-based compensation, the determination of valuation allowances associated with deferred tax assets, the fair value of debt instruments disclosed and the redemption value of redeemable noncontrolling interests. The Company bases its estimates on historical experience and on various other assumptions believed to be reasonable. Actual results may differ from such estimates.
Segment Information	Segment Information The Company has one operating segment with one business activity, providing solar energy services and products to customers. The Company’s chief operating decision maker (“CODM”) is its Chief Executive Officer, who manages operations on a consolidated basis for purposes of allocating resources. When evaluating performance and allocating resources, the CODM reviews financial information presented on a consolidated basis. Revenues from external customers (including, but not limited to homeowners) for each group of similar products and services are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Operating leases $ 47,034 $ 32,980 $ 82,096 $ 58,307 Incentives 18,303 12,414 31,339 21,627 Operating leases and incentives 65,337 45,394 113,435 79,934 Solar energy systems 28,078 35,878 48,697 66,070 Products 44,433 41,266 79,833 75,277 Solar energy systems and product sales 72,511 77,144 128,530 141,347 Total revenue $ 137,848 $ 122,538 $ 241,965 $ 221,281
Fair Value of Financial Instruments	Fair Value of Financial Instruments The Company defines fair value as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The Company uses valuation approaches to measure fair value that maximize the use of observable inputs and minimize the use of unobservable inputs. The FASB establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows: • Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date; • Level 2—Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities in markets that are not active, or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the related assets or liabilities; and • Level 3—Inputs that are unobservable, significant to the measurement of the fair value of the assets or liabilities and are supported by little or no market data. The Company’s financial instruments include cash, receivables, accounts payable, accrued expenses, distributions payable to noncontrolling interests, derivatives, and recourse and non-recourse debt.
Recently Issued and Adopted Accounting Standards	Recently Issued and Adopted Accounting Standards In May 2014, the FASB issued Accounting Standards Update (“ASU”) No. 2014-09 Revenue from Contracts with Customers (Topic 606). The standard establishes a single revenue recognition model for all contracts with customers, eliminates industry specific requirements, and expands disclosure requirements. This ASU is effective for the Company for annual reporting periods beginning after December 15, 2017 including the interim reporting periods within that fiscal year. Adoption of this ASU is either retrospective to each prior period presented or retrospective with a cumulative adjustment to retained earnings or accumulated deficit as of the adoption date. The Company currently accounts for Customer Agreements pursuant to ASC 840, Leases. The Company currently believes the adoption of ASC 842, Leases ("ASC 842") will cause Customer Agreements to be accounted for under ASC 606. As such, the Company is considering adopting ASC 842 simultaneously with its adoption of ASC 606. Under ASC 606, total consideration for Customer Agreements, including price escalators, may be recognized ratably over the term of the Customer Agreement. Customer Agreements with a prepaid element may include a significant financing component which will increase total consideration and interest expense using the effective interest rate method. The Company expects to accelerate the timing of revenue recognition for certain incentives recognized under "Operating leases and incentives." The accounting is not expected to materially differ for revenue currently recognized as "Solar energy systems and product sales." The Company is continuing to assess the impact of such changes, as well as other potential impacts of the revenue and lease standards. The Company has a project plan in place to meet the requirements of these standards using internal resources and consultants. The Company has completed its initial assessment and is currently performing contract reviews and developing a preliminary accounting policy. In February 2016, the FASB issued ASU No. 2016-02 to replace existing lease guidance with ASC 842, Leases . ASC 842 changes how the definition of a lease is applied and judgment may be required in applying the definition of a lease to certain arrangements. The new standard may result in certain contracts no longer being leases. For lessees, the standard requires all leases with an initial term greater than one year be recorded on the balance sheet as an asset and a lease liability. This ASU is effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a modified retrospective approach. In March 2016, the FASB issued ASU No. 2016-09, Compensation – Stock Compensation . The new guidance requires all income tax effects of awards to be recognized in the income statement when the awards vest or are settled. It also requires the Company to make an accounting policy election to either estimate the number of awards that are expected to vest or account for forfeitures as they occur. The Company adopted the new ASU effective January 1, 2017. The Company elected to continue to estimate the number of awards that are expected to vest. Upon the adoption, deferred tax liabilities decreased by $3.3 million , and retained earnings increased by $3.3 million as of January 1, 2017. In June 2016, the FASB issued ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments , which replaces the current incurred loss impairment methodology with a current expected credit losses model. The amendment applies to entities which hold financial assets and net investment in leases that are not accounted for at fair value through net income as well as loans, debt securities, trade receivables, net investments in leases, off-balance sheet credit exposures, reinsurance receivables and any other financial assets not excluded from the scope that have the contractual right to receive cash. This ASU is effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a modified retrospective approach, with certain aspects requiring a prospective approach. The Company is currently evaluating this guidance and the impact it may have on the Company’s consolidated financial statements. In October 2016, the FASB issued ASU 2016-16, Intra-Entity Transfers of Assets Other Than Inventory , which requires entities to recognize income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. As a result, a reporting entity will recognize the tax expense from the sale of assets in the seller’s tax jurisdiction when the transfer occurs, even though the pre-tax effects of the transaction are eliminated in the consolidated financial statements. Any deferred tax asset that arises in the buyer’s jurisdiction will also be recognized at the time of the transfer. The Company adopted the standard effective January 1, 2017. As the Company sells solar energy systems to Funds, the Company will record the current tax effects of the gain on such sales as well as a deferred tax asset related to the Company’s increased tax basis in the partnership as a result of such sales. As a result of the adoption, the Company reversed net prepaid tax assets of $378.5 million , recognized gross deferred tax assets of $378.2 million and recorded a cumulative adjustment decreasing retained earnings by $0.3 million as of January 1, 2017. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230), Restricted Cash, which requires a statement of cash flows to present the change during the period in the total of cash, cash equivalents and amounts generally described as restricted cash and restricted cash equivalents. This ASU is effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years. Early adoption is permitted. Adoption of this ASU is applied using a retrospective approach. As a result, the Company will no longer present transfers between cash and restricted cash in the consolidated cash flow statements upon adoption in the first quarter of 2018. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805), Clarifying the Definition of a Business, to clarify the definition of a business with the objective of adding guidance to assist entities with evaluating whether transactions should be accounted for as acquisitions of assets or businesses. The amendments in this update provide a screen to determine when a set of operations is not a business. The screen requires that when substantially all of the fair value of the gross assets acquired (or disposed of) is concentrated in a single identifiable asset or a group of similar identifiable assets, the set is not a business. This screen reduces the number of transactions that need to be further evaluated. The Company early adopted the new ASU effective January 1, 2017 on a prospective basis. In January 2017, the FASB issued ASU 2017-04, Intangibles – Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment, which eliminates Step 2 from the goodwill impairment test. Instead, under this amendment, an entity shall perform its annual, or interim, goodwill impairment test by comparing the fair value of the reporting unit with its carrying amount. An entity should recognize an impairment charge for the amount by which the carrying amount exceeds the reporting unit’s fair value. The ASU is effective for annual or any interim goodwill impairment tests beginning in fiscal years after December 15, 2019. Early adoption is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The adoption of this standard would only have an effect on the Company’s consolidated financial statements if it failed Step 1 of the goodwill impairment test, which has not occurred to date. In May 2017, the FASB issued ASU 2017-09, Compensation – Stock Compensation , Scope of Modification Accounting, which requires entities to apply modification accounting guidance when there are changes in the terms or conditions of a share-based payment award unless all of the following conditions are met: (i) the fair value of the modified award is the same as the fair value of the original award immediately before modification, (ii) the vesting conditions of the modified award are the same as the original award immediately before modification, and (iii) the classification of the modified award is the same as the original award immediately before modification. The Company early adopted the new ASU effective April 1, 2017, on a prospective basis.

Summary of Significant Accoun23

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2017
Accounting Policies [Abstract]
Schedule of revenue from external customers	Revenues from external customers (including, but not limited to homeowners) for each group of similar products and services are as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Operating leases $ 47,034 $ 32,980 $ 82,096 $ 58,307 Incentives 18,303 12,414 31,339 21,627 Operating leases and incentives 65,337 45,394 113,435 79,934 Solar energy systems 28,078 35,878 48,697 66,070 Products 44,433 41,266 79,833 75,277 Solar energy systems and product sales 72,511 77,144 128,530 141,347 Total revenue $ 137,848 $ 122,538 $ 241,965 $ 221,281

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Disclosures [Abstract]
Schedule of carrying values and fair values of debt instruments	The carrying values and fair values of debt instruments are as follows (in thousands): June 30, 2017 December 31, 2016 Carrying Value Fair Value Carrying Value Fair Value Lines of credit $ 486,300 $ 486,300 $ 489,200 $ 489,200 Syndicated term loans 309,713 309,713 189,989 189,989 Bank term loans 94,040 93,380 81,307 80,542 Note payable 38,328 38,459 36,232 35,396 Solar asset-backed notes 98,851 104,323 101,295 102,869 Total $ 1,027,232 $ 1,032,175 $ 898,023 $ 897,996
Schedule of fair value, financial instruments measured on recurring basis	At June 30, 2017 and December 31, 2016 , financial instruments measured at fair value on a recurring basis, based upon the fair value hierarchy are as follows (in thousands): June 30, 2017 Level 1 Level 2 Level 3 Total Derivative assets: Interest rate swaps $ — $ 5,059 $ — $ 5,059 Total $ — $ 5,059 $ — $ 5,059 Derivative liabilities: Warrants $ — $ — $ 7 $ 7 Total $ — $ — $ 7 $ 7 December 31, 2016 Level 1 Level 2 Level 3 Total Derivative assets: Interest rate swaps $ — $ 1,632 $ — $ 1,632 Total $ — $ 1,632 $ — $ 1,632 Derivative liabilities: Warrants $ — $ — $ 20 $ 20 Total $ — $ — $ 20 $ 20

Inventories (Tables)

Inventories (Tables)	6 Months Ended
	Jun. 30, 2017
Inventory Disclosure [Abstract]
Schedule of inventories	Inventories consist of the following (in thousands): June 30, 2017 December 31, 2016 Raw materials $ 48,681 $ 62,037 Work-in-process 4,063 5,289 Total $ 52,744 $ 67,326

Solar Energy Systems, Net (Tabl

Solar Energy Systems, Net (Tables)	6 Months Ended
	Jun. 30, 2017
Solar Energy Systems Disclosure [Abstract]
Solar energy systems, net	Solar energy systems, net consists of the following (in thousands): June 30, 2017 December 31, 2016 Solar energy system equipment costs $ 2,793,188 $ 2,459,856 Inverters 287,833 260,011 Initial direct costs 134,325 117,587 Total solar energy systems 3,215,346 2,837,454 Less: accumulated depreciation and amortization (359,288 ) (303,305 ) Add: construction-in-progress 95,202 95,217 Total solar energy systems, net $ 2,951,260 $ 2,629,366

Indebtedness (Tables)

Indebtedness (Tables)	6 Months Ended
	Jun. 30, 2017
Debt Disclosure [Abstract]
Schedule of debt	As of June 30, 2017 , debt consisted of the following (in thousands, except percentages): Carrying Values, net of debt discount Unused Borrowing Capacity Annual Contractual Interest Rate Interest Rate Maturity Date Current Long Term Total Recourse debt: Bank line of credit $ 247,000 $ — $ 247,000 $ 406 Varies (1) 4.33% - 4.46% April 2018 Total recourse debt $ 247,000 $ — $ 247,000 $ 406 Non-recourse debt: Term loan — 121,532 121,532 12 Varies (2) 3.74% - 3.97% April 2024 Line of credit (Aggregation Facility) — 239,300 239,300 8,500 Varies (3) 3.67% - 3.72% December 2020 Term Loan and Term Loan B 2,606 39,553 42,159 — Varies (4) 6.17 % December 2020 and 2021 Term Loan A 568 145,454 146,022 5,000 Varies (5) 3.92 % December 2021 Bank term loans 1,530 32,307 33,837 — LIBOR + 2.25% 3.48 % September 2022 LIBOR + 3.00% 4.30 % September 2022 Bank term loan 8,929 24,507 33,436 — Varies (6) 6.70% - 10.20% July 2021 Bank term loan 1,402 25,365 26,767 — 4.50 % 4.50 % April 2022 Solar asset-backed notes 3,848 95,003 98,851 — 4.40% - Class A 4.40 % July 2024 5.38% - Class B 5.38 % July 2024 Note payable — 38,328 38,328 — 12.00 % 12.00 % December 2018 Total non-recourse debt 18,883 761,349 780,232 13,512 Total debt $ 265,883 $ 761,349 $ 1,027,232 $ 13,918 As of December 31, 2016 , debt consisted of the following (in thousands, except percentages): Carrying Values, net of debt discount Unused Borrowing Capacity Annual Contractual Interest Rate Interest Rate Maturity Date Current Long Term Total Recourse debt: Bank line of credit $ — $ 244,000 $ 244,000 $ 3,406 Varies (1) 3.96% - 5.75% April 2018 Total recourse debt $ — $ 244,000 $ 244,000 $ 3,406 Non-recourse debt: Line of credit (Aggregation Facility) — 245,200 245,200 9,300 Varies (3) 2.93% - 3.39% December 2020 Term Loan and Term Loan B 116 42,870 42,986 — Varies (4) 6.00 % December 2020 December 2021 Term Loan A 616 146,387 147,003 5,000 Varies (5) 3.64 % December 2021 Bank term loan 1,074 21,249 22,323 — LIBOR + 2.25% 2.86 % September 2022 Bank term loan 7,286 23,802 31,088 1,032 Varies (6) 6.25% - 9.94% July 2021 Bank term loan 1,331 26,565 27,896 — 4.50 % 4.50 % April 2022 Solar asset-backed notes 3,730 97,565 101,295 — 4.40% - Class A 4.40 % July 2024 5.38% - Class B 5.38 % July 2024 Note payable — 36,232 36,232 — 12.00 % 12.00 % December 2018 Total non-recourse debt 14,153 639,870 654,023 15,332 Total debt $ 14,153 $ 883,870 $ 898,023 $ 18,738 (1) Loans under the facility bear interest at LIBOR +3.25% per annum or the Base Rate +2.25% per annum. The Base Rate is the highest of the Federal Funds Rate +0.50% , the Prime Rate, or LIBOR +1.00% . (2) Loans under the facility bear interest at LIBOR +2.75% per annum for the initial four -year period for LIBOR loans or the Base Rate +1.75% per annum for Base Rate Loans. (3) Loans under the facility bear interest at LIBOR +2.50% per annum for the initial three -year revolving availability period, stepping up to LIBOR +2.75% per annum in the following two -year period.

Derivatives (Tables)

Derivatives (Tables)	6 Months Ended
	Jun. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Summary of derivative instruments	At June 30, 2017 , the Company had the following derivative instruments (in thousands, other than quantity and interest rates): Type Quantity Maturity Dates Hedge Interest Rates Notional Amount Fair Market Value Interest rate swap 1 8/31/2022 1.27% - 1.29% $ 16,563 $ 315 Interest rate swap 1 9/30/2022 2.37% $ 12,610 $ (243 ) Interest rate swaps 4 4/30/2024 2.16% - 2.25% $ 96,544 $ (909 ) Interest rate swaps 2 10/31/2024 2.62% - 2.69% $ 62,633 $ (1,297 ) Interest rate swaps 4 10/31/2028 2.17% - 2.18% $ 125,100 $ (43 ) Interest rate swap 1 9/30/2031 3.23% $ 9,905 $ (231 ) Interest rate swaps 5 7/31/2034 2.48% - 3.04% $ 144,379 $ (1,223 ) Interest rate swaps 5 7/31/2035 2.56% - 2.95% $ 132,432 $ (1,428 )

VIE Arrangements (Tables)

VIE Arrangements (Tables)	6 Months Ended
	Jun. 30, 2017
Variable Interest Entity Disclosure [Abstract]
Carrying amounts and classification of the VIEs' assets and liabilities included in the consolidated balance sheets	The carrying amounts and classification of the VIEs’ assets and liabilities included in the consolidated balance sheets are as follows (in thousands): June 30, 2017 December 31, 2016 Assets Current assets Cash $ 108,039 $ 120,728 Restricted cash 3,574 1,680 Accounts receivable, net 27,547 20,771 Prepaid expenses and other current assets 235 242 Total current assets 139,395 143,421 Solar energy systems, net 2,237,670 1,920,330 Other assets 2,159 1,481 Total assets $ 2,379,224 $ 2,065,232 Liabilities Current liabilities Accounts payable $ 22,196 $ 14,873 Distributions payable to noncontrolling interests and redeemable noncontrolling interests 13,213 10,654 Accrued expenses and other liabilities 1,471 782 Deferred revenue, current portion 27,468 25,827 Deferred grants, current portion 3,623 3,644 Long-term non-recourse debt, current portion 10,331 8,616 Total current liabilities 78,302 64,396 Deferred revenue, net of current portion 416,635 396,858 Deferred grants, net of current portion 103,310 105,390 Long-term non-recourse debt, net of current portion 161,689 50,367 Other liabilities 2,337 — Total liabilities $ 762,273 $ 617,011

Redeemable Noncontrolling Int30

Redeemable Noncontrolling Interests and Equity (Tables)	6 Months Ended
	Jun. 30, 2017
Equity [Abstract]
Schedule of changes in redeemable noncontrolling interest, total stockholders' equity and noncontrolling interests	The changes in redeemable noncontrolling interests, total stockholders’ equity and noncontrolling interests were as follows (in thousands): Redeemable Noncontrolling Interests Total Stockholders' Equity Noncontrolling Interests Total Equity Balance — January 1, 2017 $ 137,907 $ 672,961 $ 251,225 $ 924,186 Exercise of stock options — 529 — 529 Issuance of restricted stock units, net of tax withholdings — (2,099 ) — (2,099 ) Shares issued in connection with the Employee Stock Purchase Plan — 1,145 — 1,145 Stock based compensation — 11,416 — 11,416 Contributions from noncontrolling interests and redeemable noncontrolling interests 75,169 — 231,123 231,123 Distributions to noncontrolling interests and redeemable noncontrolling interests (7,666 ) — (19,527 ) (19,527 ) Cumulative effect of adoption of new ASUs — 2,996 — 2,996 Net income (loss) (42,333 ) 37,848 (133,842 ) (95,994 ) Other comprehensive loss, net of taxes — (3,569 ) — (3,569 ) Balance — June 30, 2017 $ 163,077 $ 721,227 $ 328,979 $ 1,050,206

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Summary of stock option activity	The following table summarizes the activity for all stock options under all of the Company’s equity incentive plans for the six months ended June 30, 2017 (shares and aggregate intrinsic value in thousands): Number of Options Weighted Average Exercise Price Weighted Average Remaining Contractual Life Aggregate Intrinsic Value Outstanding at January 1, 2017 12,897 $ 5.94 7.49 Granted 4,585 5.03 Exercised (207 ) 2.49 Cancelled (524 ) 7.82 Outstanding at June 30, 2017 16,751 $ 5.68 7.75 $ 32,028 Options vested and exercisable at June 30, 2017 7,961 $ 5.40 6.34 $ 18,378
Summary of activity for all restricted stock units (RSUs)	The following table summarizes the activity for all restricted stock units (“RSUs”) under all of the Company’s equity incentive plans for the six months ended June 30, 2017 (shares in thousands): Number of Awards Weighted Average Grant Date Fair Value Unvested balance at January 1, 2017 4,106 $ 6.87 Granted 2,887 5.10 Issued (538 ) 6.15 Forfeited (644 ) 5.79 Unvested balance at June 30, 2017 5,811 $ 6.13
Summary of stock-based compensation expense	The Company recognized stock-based compensation expense, including ESPP expenses, in the consolidated statements of operations as follows (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Cost of operating leases and incentives $ 1,110 $ 632 $ 1,861 $ 839 Cost of solar energy systems and product sales 156 117 270 198 Sales and marketing 807 1,890 2,724 3,508 Research and development 186 149 335 246 General and administration 3,256 2,050 6,199 3,856 Total $ 5,515 $ 4,838 $ 11,389 $ 8,647

Earnings Per Share (Tables)

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2017
Earnings Per Share [Abstract]
Computation of basic and diluted net income (loss) per share	The computation of the Company’s basic and diluted net income per share are as follows (in thousands, except per share amounts): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Numerator: Net income attributable to common stockholders $ 25,122 $ 32,643 $ 37,849 $ 45,777 Denominator: Weighted average shares used to compute net income per share attributable to common stockholders, basic 105,093 101,969 104,568 101,621 Weighted average effect of potentially dilutive shares to purchase common stock 2,254 2,799 2,343 2,873 Weighted average shares used to compute net income per share attributable to common stockholders, diluted 107,347 104,768 106,911 104,494 Net income per share attributable to common stockholders Basic $ 0.24 $ 0.32 $ 0.36 $ 0.45 Diluted $ 0.23 $ 0.31 $ 0.35 $ 0.44
Schedule of shares excluded from computation of diluted net income per share	The following shares were excluded from the computation of diluted net income per share as the impact of including those shares would be anti-dilutive (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 Warrants 1,251 1,251 1,251 1,251 Outstanding stock options 13,712 8,060 13,712 8,060 Unvested restricted stock units 1,256 1,328 1,256 1,328 Total 16,219 10,639 16,219 10,639

Organization - Additional Infor

Organization - Additional Information (Details)	6 Months Ended
	Jun. 30, 2017InvestmentFund
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Power purchase or lease agreement term	20 years
Number of types of investment funds used by the company	3

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Additional Information (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)BusinessActivitySegment	Jan. 02, 2017USD ($)	Dec. 31, 2016USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments | Segment	1
Number of business activities | BusinessActivity	1
Increase (decrease) in deferred tax liabilities	$ 54,376		$ 415,397
Retained earnings	$ 45,282		$ 4,438
ASU 2016-09 | Restatement adjustment
Summary Of Significant Accounting Policies [Line Items]
Increase (decrease) in deferred tax liabilities		$ (3,300)
Retained earnings		3,300
ASU 2016-16 | Restatement adjustment
Summary Of Significant Accounting Policies [Line Items]
Retained earnings		(300)
Prepaid tax assets, net		378,500
Recognized deferred tax assets		$ 378,200

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Schedule of Revenues from External Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue, Major Customer [Line Items]
Operating leases	$ 47,034	$ 32,980	$ 82,096	$ 58,307
Incentives	18,303	12,414	31,339	21,627
Operating leases and incentives	65,337	45,394	113,435	79,934
Solar energy systems and product sales	72,511	77,144	128,530	141,347
Total revenue	137,848	122,538	241,965	221,281
Solar energy systems
Revenue, Major Customer [Line Items]
Solar energy systems and product sales	28,078	35,878	48,697	66,070
Products
Revenue, Major Customer [Line Items]
Solar energy systems and product sales	$ 44,433	$ 41,266	$ 79,833	$ 75,277

Fair Value Measurement - Schedu

Fair Value Measurement - Schedule of Carrying Values and Fair Values of Debt Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	$ 1,027,232	$ 898,023
Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	1,032,175	897,996
Bank line of credit | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	486,300	489,200
Bank line of credit | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	486,300	489,200
Syndicated term loans | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	309,713	189,989
Syndicated term loans | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	309,713	189,989
Bank term loans | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	94,040	81,307
Bank term loans | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	93,380	80,542
Note payable | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	38,328	36,232
Note payable | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	38,459	35,396
Solar asset-backed notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	98,851	101,295
Solar asset-backed notes | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt instrument, fair value	$ 104,323	$ 102,869

Fair Value Measurement - Sche37

Fair Value Measurement - Schedule of Fair Value, Financial Instruments Measured on Recurring Basis (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	$ 5,059	$ 1,632
Derivative liabilities	7	20
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	0	0
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,059	1,632
Derivative liabilities	0	0
Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Derivative liabilities	7	20
Interest rate swaps
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,059	1,632
Interest rate swaps | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Interest rate swaps | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	5,059	1,632
Interest rate swaps | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	0	0
Warrants
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	7	20
Warrants | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Warrants | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	0	0
Warrants | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative liabilities	$ 7	$ 20

Inventories - Schedule of Inven

Inventories - Schedule of Inventories (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Inventory Disclosure [Abstract]
Raw materials	$ 48,681	$ 62,037
Work-in-process	4,063	5,289
Total	$ 52,744	$ 67,326

Solar Energy Systems, Net (Deta

Solar Energy Systems, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	$ 3,215,346	$ 2,837,454
Less: accumulated depreciation and amortization	(359,288)	(303,305)
Add: construction-in-progress	95,202	95,217
Total solar energy systems, net	2,951,260	2,629,366
Solar energy system equipment costs
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	2,793,188	2,459,856
Inverters
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	287,833	260,011
Initial direct costs
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	$ 134,325	$ 117,587

Solar Energy Systems, Net - Add

Solar Energy Systems, Net - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Leases [Abstract]
Depreciation expense	$ 29.2	$ 22.5	$ 56.8	$ 42.9
Amortization of deferred grants	$ 1.8	$ 3.4	$ 3.8	$ 7.4

Indebtedness - Schedule of Debt

Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Long term debt, current	$ 265,883	$ 14,153
Long term debt, noncurrent	761,349	883,870
Long term debt	1,027,232	898,023
Unused borrowing capacity	$ 13,918	$ 18,738
Line of Credit | Minimum
Debt Instrument [Line Items]
Interest rate	3.67%	2.93%
Line of Credit | Maximum
Debt Instrument [Line Items]
Interest rate	3.72%	3.39%
Recourse debt
Debt Instrument [Line Items]
Long term debt, current	$ 247,000
Long term debt, noncurrent	0	$ 244,000
Long term debt	247,000	244,000
Unused borrowing capacity	406	3,406
Recourse debt | Bank line of credit
Debt Instrument [Line Items]
Long term debt, current	247,000
Long term debt, noncurrent	0	244,000
Long term debt	247,000	244,000
Unused borrowing capacity	$ 406	$ 3,406
Maturity date	Apr. 30, 2018	Apr. 30, 2018
Recourse debt | Bank line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	3.25%	3.25%
Recourse debt | Bank line of credit | Minimum
Debt Instrument [Line Items]
Interest rate	4.33%	3.96%
Recourse debt | Bank line of credit | Maximum
Debt Instrument [Line Items]
Interest rate	4.46%	5.75%
Recourse debt | Term loan due April 2024 | Minimum
Debt Instrument [Line Items]
Interest rate	3.74%
Recourse debt | Term loan due April 2024 | Maximum
Debt Instrument [Line Items]
Interest rate	3.97%
Non recourse debt
Debt Instrument [Line Items]
Long term debt, current	$ 18,883	$ 14,153
Long term debt, noncurrent	761,349	639,870
Long term debt	780,232	654,023
Unused borrowing capacity	13,512	15,332
Non recourse debt | Line of Credit
Debt Instrument [Line Items]
Long term debt, noncurrent	239,300	245,200
Long term debt	239,300	245,200
Unused borrowing capacity	$ 8,500	$ 9,300
Maturity date	Dec. 31, 2020	Dec. 31, 2020
Non recourse debt | Line of Credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.50%	2.50%
Non recourse debt | Term loan due April 2024
Debt Instrument [Line Items]
Long term debt, noncurrent	$ 121,532
Long term debt	121,532
Unused borrowing capacity	$ 12
Maturity date	Apr. 30, 2024
Non recourse debt | Term loan due April 2024 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Non recourse debt | Term Loan and Term Loan B
Debt Instrument [Line Items]
Long term debt, current	$ 2,606	$ 116
Long term debt, noncurrent	39,553	42,870
Long term debt	$ 42,159	$ 42,986
Interest rate	6.17%	6.00%
Non recourse debt | Term Loan and Term Loan B | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Non recourse debt | Term Loan
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2020	Dec. 31, 2020
Non recourse debt | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Non recourse debt | Term Loan B
Debt Instrument [Line Items]
Maturity date	Dec. 31, 2021	Dec. 31, 2021
Non recourse debt | Term Loan B | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Non recourse debt | Term Loan A
Debt Instrument [Line Items]
Long term debt, current	$ 568	$ 616
Long term debt, noncurrent	145,454	146,387
Long term debt	146,022	147,003
Unused borrowing capacity	$ 5,000	$ 5,000
Interest rate	3.92%	3.64%
Maturity date	Dec. 31, 2021	Dec. 31, 2021
Non recourse debt | Term Loan A | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Non recourse debt | Bank term loans
Debt Instrument [Line Items]
Long term debt, current	$ 1,530	$ 1,074
Long term debt, noncurrent	32,307	21,249
Long term debt	33,837	$ 22,323
Non recourse debt | Bank term loans due September 2022, Tranche One
Debt Instrument [Line Items]
Long term debt	$ 12,800
Interest rate	3.48%	2.86%
Maturity date	Sep. 30, 2022	Sep. 30, 2022
Non recourse debt | Bank term loans due September 2022, Tranche One | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.25%	2.25%
Non recourse debt | Bank term loans due September 2022, Tranche Two
Debt Instrument [Line Items]
Long term debt	$ 21,000
Interest rate	4.30%
Maturity date	Sep. 30, 2022
Non recourse debt | Bank term loans due September 2022, Tranche Two | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	3.00%
Non recourse debt | Bank term loan
Debt Instrument [Line Items]
Long term debt, current	$ 8,929	$ 7,286
Long term debt, noncurrent	24,507	23,802
Long term debt	$ 33,436	31,088
Unused borrowing capacity		$ 1,032
Maturity date	Jul. 31, 2021	Jul. 31, 2021
Non recourse debt | Bank term loan | Minimum
Debt Instrument [Line Items]
Interest rate	6.70%	6.25%
Non recourse debt | Bank term loan | Maximum
Debt Instrument [Line Items]
Interest rate	10.20%	9.94%
Non recourse debt | Bank term loan
Debt Instrument [Line Items]
Long term debt, current	$ 1,402	$ 1,331
Long term debt, noncurrent	25,365	26,565
Long term debt	$ 26,767	$ 27,896
Interest rate	4.50%	4.50%
Maturity date	Apr. 30, 2022	Apr. 30, 2022
Non recourse debt | Solar asset-backed notes
Debt Instrument [Line Items]
Long term debt, current	$ 3,848	$ 3,730
Long term debt, noncurrent	95,003	97,565
Long term debt	$ 98,851	$ 101,295
Non recourse debt | Solar asset-backed notes - Class A
Debt Instrument [Line Items]
Annual contractual interest rate	4.40%	4.40%
Interest rate	4.40%	4.40%
Maturity date	Jul. 31, 2024	Jul. 31, 2024
Non recourse debt | Solar asset-backed notes - Class B
Debt Instrument [Line Items]
Annual contractual interest rate	5.38%	5.38%
Interest rate	5.38%	5.38%
Maturity date	Jul. 31, 2024	Jul. 31, 2024
Non recourse debt | Note payable
Debt Instrument [Line Items]
Long term debt, noncurrent	$ 38,328	$ 36,232
Long term debt	$ 38,328	$ 36,232
Interest rate	12.00%	12.00%
Maturity date	Dec. 31, 2018	Dec. 31, 2018

Indebtedness - Schedule of De42

Indebtedness - Schedule of Debt - Additional Details (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Recourse debt | Bank line of credit | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	3.25%	3.25%
Recourse debt | Bank line of credit | Base Rate
Debt Instrument [Line Items]
Annual contractual interest rate	2.25%	2.25%
Recourse debt | Bank line of credit | Federal Funds Rate
Debt Instrument [Line Items]
Annual contractual interest rate	0.50%	0.50%
Recourse debt | Bank line of credit | Prime Rate
Debt Instrument [Line Items]
Annual contractual interest rate	1.00%	1.00%
Non recourse debt | London Interbank Offered Rate (LIBOR) | Line of Credit
Debt Instrument [Line Items]
Annual contractual interest rate	2.50%	2.50%
Debt instrument, variable rate periodic increase	2.75%	2.75%
Revolving line of credit facility available period	3 years	3 years
Revolving line of credit facility available period increase	2 years	2 years
Non recourse debt | Term loan due April 2024 | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Revolving line of credit facility available period increase	4 years	4 years
Non recourse debt | Term loan due April 2024 | Base Rate
Debt Instrument [Line Items]
Debt instrument, variable rate periodic increase	1.75%	1.75%
Non recourse debt | Term Loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Debt instrument, variable rate periodic increase	6.50%	6.50%
Revolving line of credit facility available period increase	3 years	3 years
Non recourse debt | Term Loan B | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.00%	5.00%
Non recourse debt | Term Loan A | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	2.75%	2.75%
Debt instrument, variable rate periodic increase	3.00%	3.00%
Contracted SRECs | Non recourse debt | Bank term loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	5.50%	5.50%
Uncontracted SRECs | Non recourse debt | Bank term loan | London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Annual contractual interest rate	9.00%	9.00%

Indebtedness - Additional Infor

Indebtedness - Additional Information (Details) - USD ($)	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	May 31, 2017	May 09, 2017	Jun. 30, 2016	Dec. 31, 2015	Dec. 31, 2014
Debt Instrument [Line Items]
Loan outstanding balance	$ 1,027,232,000	$ 898,023,000
Cash	211,321,000	206,364,000			$ 207,220,000	$ 203,864,000
Recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	247,000,000	244,000,000
Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	780,232,000	654,023,000
Line of Credit | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 239,300,000	$ 245,200,000
Debt maturity date	Dec. 31, 2020	Dec. 31, 2020
Minimum | Line of Credit
Debt Instrument [Line Items]
Interest rate	3.67%	2.93%
Maximum | Line of Credit
Debt Instrument [Line Items]
Interest rate	3.72%	3.39%
Aggregation facility | Line of Credit | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 261,800,000
Bank line of credit
Debt Instrument [Line Items]
Cash	$ 211,300,000
Debt instrument term	3 years
Bank line of credit | Recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 247,000,000	$ 244,000,000
Debt maturity date	Apr. 30, 2018	Apr. 30, 2018
Bank line of credit | Minimum | Recourse debt
Debt Instrument [Line Items]
Interest rate	4.33%	3.96%
Bank line of credit | Maximum | Recourse debt
Debt Instrument [Line Items]
Interest rate	4.46%	5.75%
Bank line of credit | Syndicated working capital facility
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity	$ 250,000,000
Minimum unencumbered liquid assets to be maintained	$ 25,000,000
Bank line of credit | Syndicated working capital facility | Minimum
Debt Instrument [Line Items]
Interest coverage ratio	200.00%
Term loan due April 2024 | Non recourse debt
Debt Instrument [Line Items]
Line of credit, maximum borrowing capacity			$ 202,000,000
Loan outstanding balance	$ 121,532,000
Debt maturity date	Apr. 30, 2024
Term loan due April 2024 | Term Loan | Non recourse debt
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 195,000,000
Term loan due April 2024 | Letter of Credit | Non recourse debt
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 7,000,000
Term loan due April 2024 | Minimum | Recourse debt
Debt Instrument [Line Items]
Interest rate	3.74%
Term loan due April 2024 | Maximum | Recourse debt
Debt Instrument [Line Items]
Interest rate	3.97%
Syndicated term loans | Credit facility agreements with syndicate of banks
Debt Instrument [Line Items]
Maximum borrowing capacity							$ 165,703,000
Bank term loans due September 2022, Tranche One | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 12,800,000
Debt maturity date	Sep. 30, 2022	Sep. 30, 2022
Interest rate	3.48%	2.86%
Bank term loans due September 2022, Tranche Two | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 21,000,000
Debt maturity date	Sep. 30, 2022
Interest rate	4.30%
Bank term loan | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 33,436,000	$ 31,088,000
Debt maturity date	Jul. 31, 2021	Jul. 31, 2021
Bank term loan | Minimum | Non recourse debt
Debt Instrument [Line Items]
Interest rate	6.70%	6.25%
Bank term loan | Maximum | Non recourse debt
Debt Instrument [Line Items]
Interest rate	10.20%	9.94%
Bank term loan | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 26,767,000	$ 27,896,000
Debt maturity date	Apr. 30, 2022	Apr. 30, 2022
Interest rate	4.50%	4.50%
Solar asset-backed notes
Debt Instrument [Line Items]
Secured borrowings assets carrying amount	$ 177,400,000	$ 181,800,000
Debt instrument discount rate	0.08%
Solar asset-backed notes | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 98,851,000	101,295,000
Note payable | Non recourse debt
Debt Instrument [Line Items]
Loan outstanding balance	$ 38,328,000	$ 36,232,000
Debt maturity date	Dec. 31, 2018	Dec. 31, 2018
Interest rate	12.00%	12.00%
Note payable | Payment-in-kind
Debt Instrument [Line Items]
Loan outstanding balance	$ 11,500,000	$ 9,500,000
Interest rate	12.00%

Derivatives - Additional Inform

Derivatives - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	$ (3,709)	$ 165	$ (4,473)	$ (5,633)
Recognized interest expense on derivatives into earnings, net of tax	(340)	(120)	(904)	(645)
Derivative assets	300		300		$ 1,600
Derivative liabilities	5,300		5,300
Interest rate swaps
Derivatives, Fair Value [Line Items]
Unrealized gain (loss) on derivatives, net of tax	(3,700)	200	(4,500)	(5,600)
Unrealized gain (loss) on derivatives, tax expense	(2,400)		(2,900)	(3,600)
Recognized interest expense on derivatives into earnings, net of tax	300	$ 100	900	600
Recognized interest expense on derivatives into earnings, tax expense	(200)		(600)	$ 400
Additional amount to be classified as an increase to interest expense during next 12 months	$ 2,100		$ 2,100

Derivatives - Summary of Deriva

Derivatives - Summary of Derivative Instruments (Details) - Interest rate swaps $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)Instrument
Interest rate swap, 8/31/2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Maturity dates	Aug. 31, 2022
Notional amount	$ 16,563
Derivative asset, fair market value	$ 315
Interest rate swap, 8/31/2022 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	1.27%
Interest rate swap, 8/31/2022 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	1.29%
Interest rate swap, 9/30/2022
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Maturity dates	Sep. 30, 2022
Hedge interest rates	2.37%
Notional amount	$ 12,610
Derivative liability, fair market value	$ (243)
Interest rate swap, 4/30/2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	4
Maturity dates	Apr. 30, 2024
Notional amount	$ 96,544
Derivative liability, fair market value	$ (909)
Interest rate swap, 4/30/2024 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.16%
Interest rate swap, 4/30/2024 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.25%
Interest rate swap, 10/31/2024
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	2
Maturity dates	Oct. 31, 2024
Notional amount	$ 62,633
Derivative liability, fair market value	$ (1,297)
Interest rate swap, 10/31/2024 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.62%
Interest rate swap, 10/31/2024 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.69%
Interest rate swap, 10/31/2028
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	4
Maturity dates	Oct. 31, 2028
Notional amount	$ 125,100
Derivative liability, fair market value	$ (43)
Interest rate swap, 10/31/2028 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.17%
Interest rate swap, 10/31/2028 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.18%
Interest rate swap, 9/30/2031
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	1
Maturity dates	Sep. 30, 2031
Hedge interest rates	3.23%
Notional amount	$ 9,905
Derivative liability, fair market value	$ (231)
Interest rate swap, 7/31/2034
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Maturity dates	Jul. 31, 2034
Notional amount	$ 144,379
Derivative liability, fair market value	$ (1,223)
Interest rate swap, 7/31/2034 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.48%
Interest rate swap, 7/31/2034 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	3.04%
Interest rate swap, 7/31/2035
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Quantity | Instrument	5
Maturity dates	Jul. 31, 2035
Notional amount	$ 132,432
Derivative liability, fair market value	$ (1,428)
Interest rate swap, 7/31/2035 | Minimum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.56%
Interest rate swap, 7/31/2035 | Maximum
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Hedge interest rates	2.95%

Lease Pass-Through Financing 46

Lease Pass-Through Financing Obligations - Additional Information (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	20 years
Solar energy systems, gross	$ 3,215,346	$ 2,837,454
Depreciation on lease	359,288	303,305
Solar energy systems under lease pass-through fund arrangements
Property Subject to or Available for Operating Lease [Line Items]
Solar energy systems, gross	494,000	494,900
Depreciation on lease	59,800	50,800
Maximum percentage to defer portion of upfront payments			25.00%
Loans amount	$ 21,900	$ 23,200
Solar energy systems under lease pass-through fund arrangements | Minimum
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	20 years
Solar energy systems under lease pass-through fund arrangements | Maximum
Property Subject to or Available for Operating Lease [Line Items]
Initial lease term	25 years

VIE Arrangements - Carrying Amo

VIE Arrangements - Carrying Amounts and Classification of the VIEs' Assets and Liabilities Included in the Consolidated Balance Sheets (Details) - USD ($) $ in Thousands		Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash		$ 211,321	$ 206,364	$ 207,220	$ 203,864
Restricted cash		15,672	11,882
Accounts receivable, net		64,030	60,258
Prepaid expenses and other current assets		12,575	9,802
Total current assets		356,342	369,345
Solar energy systems, net		2,951,260	2,629,366
Other assets		29,834	34,936
Total assets (1)	[1]	3,489,102	3,572,818
Current liabilities:
Accounts payable		75,336	66,018
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		13,212	10,654
Accrued expenses and other liabilities		52,961	59,261
Deferred revenue, current portion		70,601	70,849
Deferred grants, current portion		8,363	8,011
Long-term non-recourse debt, current portion		18,883	14,153
Total current liabilities		500,750	244,784
Deferred revenue, net of current portion		578,484	583,401
Deferred grants, net of current portion		222,184	226,893
Long-term non-recourse debt, net of current portion		761,349	639,870
Other liabilities		10,682	5,457
Total liabilities (1)	[1]	2,275,819	2,510,725
Variable Interest Entities
Current assets:
Cash		108,039	120,728
Restricted cash		3,574	1,680
Accounts receivable, net		27,547	20,771
Prepaid expenses and other current assets		235	242
Total current assets		139,395	143,421
Solar energy systems, net		2,237,670	1,920,330
Other assets		2,159	1,481
Total assets (1)		2,379,224	2,065,232
Current liabilities:
Accounts payable		22,196	14,873
Distributions payable to noncontrolling interests and redeemable noncontrolling interests		13,213	10,654
Accrued expenses and other liabilities		1,471	782
Deferred revenue, current portion		27,468	25,827
Deferred grants, current portion		3,623	3,644
Long-term non-recourse debt, current portion		10,331	8,616
Total current liabilities		78,302	64,396
Deferred revenue, net of current portion		416,635	396,858
Deferred grants, net of current portion		103,310	105,390
Long-term non-recourse debt, net of current portion		161,689	50,367
Other liabilities		2,337	0
Total liabilities (1)		$ 762,273	$ 617,011
[1]	The Company’s consolidated assets as of June 30, 2017 and December 31, 2016 include $2,379,224 and $2,065,232, respectively, in assets of variable interest entities, or “VIEs”, that can only be used to settle obligations of the VIEs. Solar energy systems, net, as of June 30, 2017 and December 31, 2016 were $2,237,670 and $1,920,330, respectively; cash as of June 30, 2017 and December 31, 2016 were $108,039 and $120,728, respectively; restricted cash as of June 30, 2017 and December 31, 2016 were $3,574 and $1,680, respectively; accounts receivable, net as of June 30, 2017 and December 31, 2016 were $27,547 and $20,771, respectively; prepaid expenses and other current assets as of June 30, 2017 and December 31, 2016 were $235 and $242, respectively and other assets as of June 30, 2017 and December 31, 2016 were $2,159 and $1,481, respectively. The Company’s consolidated liabilities as of June 30, 2017 and December 31, 2016 include $762,273 and $617,011, respectively, in liabilities of VIEs whose creditors have no recourse to the Company. These liabilities include accounts payable as of June 30, 2017 and December 31, 2016 of $22,196 and $14,873, respectively; distributions payable to noncontrolling interests and redeemable noncontrolling interests as of June 30, 2017 and December 31, 2016 of $13,213 and $10,654, respectively; accrued expenses and other liabilities as of June 30, 2017 and December 31, 2016 of $1,471 and $782, respectively; deferred revenue as of June 30, 2017 and December 31, 2016 of $444,103 and $422,685, respectively; deferred grants as of June 30, 2017 and December 31, 2016 of $106,933 and $109,034, respectively; and long-term non-recourse debt as of June 30, 2017 and December 31, 2016 of $172,020 and $58,983, respectively.

Redeemable Noncontrolling Int48

Redeemable Noncontrolling Interests and Equity - Schedule of Changes in Redeemable Noncontrolling Interest,Total Stockholders' Equity and Noncontrolling Interests (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)fund	Dec. 31, 2016fund
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 137,907
Balance at end of period	163,077
Balance at beginning of period	924,186
Exercise of stock options	529
Issuance of restricted stock units, net of tax withholdings	(2,099)
Shares issued in connection with the Employee Stock Purchase Plan	1,145
Stock based compensation	11,416
Contributions from noncontrolling interests	231,123
Distributions to noncontrolling interests	(19,527)
Cumulative effect of adoption of new ASUs	2,996
Net income (loss)	(95,994)
Other comprehensive loss, net of taxes	(3,569)
Balance at end of period	$ 1,050,206
Number of funds, carrying value adjusted to redemption value | fund	6	4
Redeemable Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	$ 137,907
Contributions from redeemable noncontrolling interests	75,169
Distributions to redeemable noncontrolling interests	(7,666)
Net income (loss) attributable to redeemable noncontrolling interests	(42,333)
Balance at end of period	163,077
Total Stockholders' Equity
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	672,961
Exercise of stock options	529
Issuance of restricted stock units, net of tax withholdings	(2,099)
Shares issued in connection with the Employee Stock Purchase Plan	1,145
Stock based compensation	11,416
Cumulative effect of adoption of new ASUs	2,996
Net income (loss)	37,848
Other comprehensive loss, net of taxes	(3,569)
Balance at end of period	721,227
Noncontrolling Interests
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balance at beginning of period	251,225
Contributions from noncontrolling interests	231,123
Distributions to noncontrolling interests	(19,527)
Net income (loss)	(133,842)
Balance at end of period	$ 328,979

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Number of Options
Number of stock options, outstanding, balance (in shares)	12,897,000
Number of stock options, granted (in shares)	4,585,000
Number stock options, exercised (in shares)	(207,000)
Number of stock options, cancelled (in shares)	(524,000)
Number of stock options, outstanding, balance (in shares)	16,751,000	12,897,000
Number of stock options, options vested and exercisable (in shares)	7,961,000
Weighted Average Exercise Price
Weighted-average exercise price, outstanding, balance (in dollars per share)	$ 5.94
Weighted-average exercise price, granted (in dollars per share)	5.03
Weighted-average exercise price, exercised (in dollars per share)	2.49
Weighted-average exercise price, cancelled (in dollars per share)	7.82
Weighted-average exercise price, outstanding, balance (in dollars per share)	5.68	$ 5.94
Weighted-average exercise price, options vested and exercisable (in dollars per share)	$ 5.40
Weighted-average remaining contractual life, options outstanding	7 years 9 months	7 years 5 months 26 days
Weighted-average remaining contractual life, options vested and exercisable	6 years 4 months 2 days
Aggregate intrinsic value, options outstanding	$ 32,028
Aggregate intrinsic value, options vested and exercisable	$ 18,378

Stock-Based Compensation - Su50

Stock-Based Compensation - Summary of Activity for All Restricted Stock Units ("RSUs") (Details) - Restricted Stock Units (RSUs) shares in Thousands	6 Months Ended
	Jun. 30, 2017$ / sharesshares
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]
Number of awards, unvested, balance (in units) | shares	4,106
Number of awards, granted (in units) | shares	2,887
Number of awards, issued (in units) | shares	(538)
Number of awards, forfeited (in units) | shares	(644)
Number of awards, unvested, balance (in units) | shares	5,811
Weighted-average grant date fair value, unvested, beginning balance (in dollars per unit) | $ / shares	$ 6.87
Weighted-average grant date fair value, granted (in dollars per unit) | $ / shares	5.10
Weighted-average grant date fair value, issued (in dollars per unit) | $ / shares	6.15
Weighted-average grant date fair value, forfeited (in dollars per unit) | $ / shares	5.79
Weighted-average grant date fair value, unvested, ending balance (in dollars per unit) | $ / shares	$ 6.13

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Details) - Employee Stock Purchase Plan	1 Months Ended	3 Months Ended	6 Months Ended
	Jul. 31, 2015USD ($)shares	Jun. 30, 2017purchase_period	Jun. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
ESPP offering period		24 months
Number of purchase periods | purchase_period		4
Maximum number of shares available for employee to purchase per offering period | shares	10,000
Term of offering period			Each purchase period begins on the first trading day on or after May 15 and November 15 of each year.
Maximum percentage in payroll deductions to acquire shares of common stock	15.00%
Maximum deductible fair market value of shares available for employee to purchase per calendar year | $	$ 25,000

Stock-Based Compensation - Su52

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	$ 5,515	$ 4,838	$ 11,389	$ 8,647
Cost of operating leases and incentives
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	1,110	632	1,861	839
Cost of solar energy systems and product sales
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	156	117	270	198
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	807	1,890	2,724	3,508
Research and development
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	186	149	335	246
General and administration
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items]
Compensation expense recognized	$ 3,256	$ 2,050	$ 6,199	$ 3,856

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Jan. 02, 2017	Dec. 31, 2016
Income Tax Contingency [Line Items]
Effective income tax rates	(31.00%)	(5.20%)	(19.70%)	(2.30%)
Cumulative unrecognized federal gross windfall net operating loss carryover						$ 8,600
Cumulative unrecognized state gross windfall net operating loss carryover						6,800
Retained earnings	$ 45,282		$ 45,282			4,438
Unrecognized tax benefits	1,500		1,500			1,500
Unrecognized tax benefits income tax penalties and interest accrued	$ 400		$ 400			300
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards						524,900
Net operating loss carryforwards, Year of expiration			2,024
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards						$ 571,300
Net operating loss carryforwards, Year of expiration			2,028
ASU 2016-16 | Restatement adjustment
Income Tax Contingency [Line Items]
Prepaid tax assets, net					$ 378,500
Recognized deferred tax assets					378,200
Retained earnings					(300)
ASU 2016-09 | Restatement adjustment
Income Tax Contingency [Line Items]
Deferred tax assets					3,300
Retained earnings					$ 3,300

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Other Commitments [Line Items]
Letters of credit outstanding, amount	$ 11.2		$ 11.2		$ 6.2
Capital lease obligations	17.3		17.3		23
Non cancellable operating leases arrangements
Other Commitments [Line Items]
Operating lease expenses	3.2	$ 2.9	6.3	$ 5.6
Deferred rent liabilities	$ 2.7		$ 2.7		$ 2.9
Maximum | Capital lease obligations
Other Commitments [Line Items]
Lease obligation interest rates	10.00%		10.00%
Letter of Credit
Other Commitments [Line Items]
Letter of credit, fee percentage					2.50%
Letter of Credit | Minimum
Other Commitments [Line Items]
Letter of credit, fee percentage			2.50%
Letter of Credit | Maximum
Other Commitments [Line Items]
Letter of credit, fee percentage			3.00%

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Net Income per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net income attributable to common stockholders	$ 25,122	$ 32,643	$ 37,849	$ 45,777
Denominator:
Weighted average shares used to compute net income per share attributable to common stockholders, basic (in shares)	105,093	101,969	104,568	101,621
Weighted average effect of potentially dilutive shares to purchase common stock (in shares)	2,254	2,799	2,343	2,873
Weighted average shares used to compute net income per share attributable to common stockholders, diluted (in shares)	107,347	104,768	106,911	104,494
Net income per share available to common stockholders
Basic (in dollars per share)	$ 0.24	$ 0.32	$ 0.36	$ 0.45
Diluted (in dollars per share)	$ 0.23	$ 0.31	$ 0.35	$ 0.44

Earnings Per Share - Schedule o

Earnings Per Share - Schedule of Shares Excluded From Computation of Diluted Net Income Per Share (Details) - shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income per share (in shares)	16,219	10,639	16,219	10,639
Warrants
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income per share (in shares)	1,251	1,251	1,251	1,251
Outstanding stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income per share (in shares)	13,712	8,060	13,712	8,060
Unvested restricted stock units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of net income per share (in shares)	1,256	1,328	1,256	1,328

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Details) - Enphase - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Related Party Transaction [Line Items]
Purchase from related party	$ 3	$ 1.4	$ 4.4	$ 14.4
Outstanding payables to related party	$ 2.7		$ 2.7		$ 0.4