Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net loss attributable to common stockholders	$ (63,393)	$ (123,007)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss attributable to noncontrolling and redeemable noncontrolling interests	(9,143)	(9,979)
Depreciation	21,554	23,612
Write off of property, plant and equipment, net	661	5
Revaluation of derivative contracts	28,611	(1,278)
Stock-based compensation	15,773	14,663
Loss on long-term REC purchase contract	100	48
Revaluation of preferred stock warrants	(7,456)	237
Common stock warrant valuation	(166)	0
Common stock warrant valuation	520	533
Amortization of debt issuance cost	1,938	1,325
Amortization of debt discount from embedded derivatives	11,962	20,634
Changes in operating assets and liabilities:
Accounts receivable	(6,486)	(5,272)
Inventories, net	(46,172)	(17,612)
Deferred cost of revenue	48,760	(34,936)
Customer financing receivable and others	2,439	2,953
Prepaid expenses and other current assets	4,544	(940)
Other long-term assets	15	2,450
Accounts payable	5,217	(13,331)
Accrued warranty	(1,883)	(6,591)
Accrued other current liabilities	(12,815)	6,094
Deferred revenue and customer deposits	(31,817)	35,896
Other long-term liabilities	18,652	24,921
Net cash used in operating activities	(18,585)	(79,575)
Cash flows from investing activities:
Purchase of property, plant and equipment	(1,595)	(2,265)
Purchase of marketable securities	(15,732)	0
Maturities of marketable securities	27,000	0
Net cash provided by (used in) investing activities	9,673	(2,265)
Cash flows from financing activities:
Borrowings from issuance of debt	0	100,000
Repayment of debt	(9,201)	(11,945)
Repayment of debt to related parties	(627)	(409)
Debt issuance costs	0	(6,108)
Proceeds from noncontrolling and redeemable noncontrolling interests	0	13,652
Distributions to noncontrolling and redeemable noncontrolling interests	(11,582)	(17,728)
Proceeds from issuance of common stock	742	227
Payments of initial public offering issuance costs	(1,160)	(533)
Net cash provided by (used in) financing activities	(21,828)	77,156
Net decrease in cash, cash equivalents, and restricted cash	(30,740)	(4,684)
Beginning of period	180,612	217,915
End of period	149,872	213,231
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	16,540	11,318
Cash paid during the period for taxes	625	121
Non-cash investing and financing activities:
Liabilities recorded for property, plant and equipment	512	145
Liabilities recorded for intangible assets	169	0
Issuance of common stock	0	1,816
Issuance of restricted stock	532	0
Accrued distributions to Equity Investors	566	567
Accrued interest and issuance for notes	16,920	13,913
Accrued interest and issuance for notes to related parties	$ 1,195	$ 2,071