Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (155,504)	$ (72,536)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and Amortization	31,023	21,554
Write-off of property, plant and equipment, net	2,704	661
Write-off of PPA II decommissioned assets	25,613	0
Debt make-whole penalty	5,934	0
Revaluation of derivative contracts	555	28,611
Stock-based compensation	115,100	15,773
Loss on long-term REC purchase contract	60	100
Revaluation of stock warrants	0	(7,456)
Revaluation of preferred stock warrants	0	(166)
Amortization of debt issuance cost	11,255	14,420
Changes in operating assets and liabilities:
Accounts receivable	46,591	(6,486)
Inventories	27,542	(46,172)
Deferred cost of revenue	19,198	48,760
Customer financing receivable and other	2,713	2,439
Prepaid expenses and other current assets	8,477	4,544
Other long-term assets	1,028	15
Accounts payable	(5,461)	5,217
Accrued warranty	(6,843)	(1,883)
Accrued other current liabilities	7,213	(12,815)
Deferred revenue and customer deposits	(25,411)	(31,817)
Other long-term liabilities	3,419	18,652
Net cash provided by (used in) operating activities	115,206	(18,585)
Cash flows from investing activities:
Purchase of property, plant and equipment	(18,882)	(1,595)
Payments for acquisition of intangible assets	(970)	0
Purchase of marketable securities	0	(15,732)
Proceeds from maturity of marketable securities	104,500	27,000
Net cash provided by investing activities	84,648	9,673
Cash flows from financing activities:
Repayment of debt	(83,997)	(9,201)
Repayment of debt to related parties	(1,220)	(627)
Debt make-whole payment	(5,934)	0
Payments to redeemable noncontrolling interests related to the PPA II decommissioning	(18,690)	0
Distributions to noncontrolling and redeemable noncontrolling interests	(7,753)	(11,582)
Proceeds from issuance of common stock	8,321	742
Payments of initial public offering issuance costs	0	(1,160)
Net cash used in financing activities	(109,273)	(21,828)
Net increase (decrease) in cash, cash equivalents, and restricted cash	90,581	(30,740)
Beginning of period	280,485	180,612
End of period	371,066	149,872
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	23,867	16,540
Cash paid during the period for taxes	497	625
Non-cash investing and financing activities:
Liabilities recorded for property, plant and equipment	4,662	512
Liabilities recorded for intangible assets	0	169
Liabilities recorded for mandatory redeemable noncontrolling interest	36,994	0
Equity investment in PPA II assets	27,809	0
Issuance of restricted stock	0	532
Accrued distributions to Equity Investors	566	566
Accrued interest and issuance for notes	888	16,920
Accrued interest and issuance for notes to related parties	$ 0	$ 1,195