Condensed Consolidated Statements of Cash Flows (unaudited) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)
Cash flows from operating activities:
Net income (loss)	$ (195,434)	$ (155,046)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and Amortization	55,816	32,141
Write-off of property, plant and equipment, net	2,987	901
Write-off of PPA II decommissioned assets	25,613	0
Debt make-whole penalty	5,934	0
Revaluation of derivative contracts	1,335	26,761
Stock-based compensation	154,955	87,451
Loss on long-term REC purchase contract	61	150
Revaluation of stock warrants	0	(9,109)
Amortization of debt issuance cost	16,295	20,279
Changes in operating assets and liabilities:
Accounts receivable	58,150	(11,168)
Inventories	(7,896)	(44,465)
Deferred cost of revenue	56,854	47,945
Customer financing receivable and other	4,142	3,736
Prepaid expenses and other current assets	7,928	(6,514)
Other long-term assets	3,281	1,052
Accounts payable	14,171	11,236
Accrued warranty	(3,941)	1,164
Accrued other current liabilities	5,029	1,885
Deferred revenue and customer deposits	(68,180)	(32,203)
Other long-term liabilities	2,083	10,156
Net cash provided by (used in) operating activities	139,183	(13,648)
Cash flows from investing activities:
Purchase of property, plant and equipment	(23,474)	(4,333)
Payments for acquisition of intangible assets	(1,478)	(2,762)
Purchase of marketable securities	0	(15,732)
Proceeds from maturity of marketable securities	104,500	38,250
Net cash provided by investing activities	79,548	15,423
Cash flows from financing activities:
Repayment of debt	(93,263)	(14,036)
Repayment of debt to related parties	(1,691)	(990)
Debt make-whole payment	(5,934)	0
Payments to redeemable noncontrolling interests related to the PPA II decommissioning	(43,713)	0
Distributions to noncontrolling and redeemable noncontrolling interests	(9,363)	(14,192)
Proceeds from issuance of common stock	12,623	1,456
Proceeds from public offerings, net of underwriting discounts and commissions	0	292,529
Payments of initial public offering issuance costs	0	(2,928)
Net cash (used in) provided by financing activities	(141,341)	261,839
Net increase in cash, cash equivalents, and restricted cash	77,390	263,614
Beginning of period	280,485	180,612
End of period	357,875	444,226
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	35,894	30,601
Cash paid during the period for taxes	715	1,052
Non-cash investing and financing activities:
Liabilities recorded for property, plant and equipment	2,574	1,874
Liabilities recorded for intangible assets	0	3,180
Reclassification of redeemable convertible preferred stock warrant liability to additional paid-in capital	0	882
Conversion of redeemable convertible preferred stock into additional paid-in capital	0	1,465,841
Conversion of 8% convertible promissory notes into additional paid-in capital	0	221,579
Reclassification of derivative liability into additional paid-in capital	0	177,208
Liabilities recorded for initial public offering in accounts payable	0	1,431
Reclassification of prior year prepaid initial public offering costs to additional paid-in capital	0	5,894
Liabilities recorded for mandatorily redeemable noncontrolling interest	11,971	0
Equity investment in PPA II assets	27,809	0
Accrued distributions to Equity Investors	288	288
Accrued interest and issuance for notes	1,347	20,101
Accrued interest and issuance for notes to related parties	$ 0	$ 1,229
Convertible promissory notes | Convertible Promissory Notes due December 2019 and 2020, Recourse
Interest rate percentage	5.00%