Consolidated Statements of Cash Flows (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ (88,273)	$ (22,348)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and Amortization	11,271	10,847
Write-off of property, plant and equipment, net	1	0
Revaluation of derivative contracts	(453)	7,157
Stock-based compensation	63,882	7,956
Loss on long-term REC purchase contract	59	12
Revaluation of stock warrants	0	(3,271)
Common stock warrant valuation	0	(100)
Amortization of debt issuance cost	5,152	7,168
Changes in operating assets and liabilities:
Accounts receivable	816	(28,203)
Inventories	15,932	(6,818)
Deferred cost of revenue	26,014	16,282
Customer financing receivable and other	1,339	1,306
Prepaid expenses and other current assets	5,194	(446)
Other long-term assets	83	1,266
Accounts payable	(2,464)	(827)
Accrued warranty	(2,500)	(87)
Accrued other current liabilities	823	(10,083)
Deferred revenue and customer deposits	(44,533)	(22,347)
Other long-term liabilities	3,487	8,049
Net cash used in operating activities	(4,170)	(34,487)
Cash flows from investing activities:
Purchase of property, plant and equipment	(8,543)	(223)
Payments for acquisition of intangible assets	(848)	0
Purchase of marketable securities	0	(8,991)
Proceeds from maturity of marketable securities	104,500	15,750
Net cash provided by investing activities	95,109	6,536
Cash flows from financing activities:
Repayment of debt	(5,016)	(4,489)
Repayment of debt to related parties	(778)	(290)
Distributions to noncontrolling and redeemable noncontrolling interests	(3,189)	(3,832)
Proceeds from issuance of common stock	7,493	120
Payments of initial public offering issuance costs	0	(578)
Net cash used in financing activities	(1,490)	(9,069)
Net increase (decrease) in cash, cash equivalents, and restricted cash	89,449	(37,020)
Beginning of period	280,485	180,612
End of period	369,934	143,592
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	14,545	11,216
Cash paid during the period for taxes	222	401
Non-cash investing and financing activities:
Liabilities recorded for property, plant and equipment	2,067	65
Liabilities recorded for intangible assets	0	362
Issuance of restricted stock	0	242
Accrued distributions to Equity Investors	282	282
Accrued interest and issuance for notes	439	7,808
Accrued interest and issuance for notes to related parties	$ 0	$ 1,165