Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Cash flows from operating activities:
Net loss	$ (29,781)	$ (81,642)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	13,442	13,035
Non-cash lease expense	2,115	1,549
Revaluation of derivative contracts	290	241
Stock-based compensation	17,210	23,019
Gain on long-term REC purchase contract	0	(4)
Loss on extinguishment of debt	0	14,098
Amortization of debt issuance costs and premium, net	971	4,755
Changes in operating assets and liabilities:
Accounts receivable	(8,815)	2,136
Inventories	(10,820)	2,083
Deferred cost of revenue	(13,952)	(19,494)
Customer financing receivable	1,302	1,240
Prepaid expenses and other current assets	3,908	3,060
Other long-term assets	(687)	(2,924)
Accounts payable	14,145	4,822
Accrued warranty	(4,305)	681
Accrued expenses and other current liabilities	(24,941)	489
Operating lease liabilities	2,474	1,717
Deferred revenue and customer deposits	(48,036)	5,253
Other long-term liabilities	1,393	1,372
Net cash used in operating activities	(89,035)	(27,948)
Cash flows from investing activities:
Purchase of property, plant and equipment	(12,932)	(12,360)
Net cash used in investing activities	(12,932)	(12,360)
Cash flows from financing activities:
Proceeds from issuance of debt to related parties	0	30,000
Repayment of debt	(4,862)	(9,128)
Repayment of debt - related parties	0	(2,105)
Proceeds from financing obligations	5,016	0
Repayment of financing obligations	(3,077)	(2,503)
Distributions to noncontrolling interests and redeemable noncontrolling interests	(3,880)	(4,270)
Proceeds from issuance of common stock	57,953	4,845
Net cash provided by financing activities	51,150	16,839
Effect of exchange rate changes on cash, cash equivalent and restricted cash	(229)	0
Net decrease in cash, cash equivalents, and restricted cash	(51,046)	(23,469)
Beginning of period	416,710	377,388	$ 377,388
End of period	365,664	353,919	416,710
Supplemental disclosure of cash flow information:
Cash paid during the period for interest	14,963	17,790
Operating cash flows from operating leases	2,830	2,236
Operating cash flows from financing leases	39	1
Financing cash flows from financing leases	63	4
Cash paid during the period for income taxes	72	29
Non-cash investing and financing activities:
Increase in Recourse debt, non-current upon adoption of ASU 2020-06, net (Note 2)	0		$ 121,491
Liabilities recorded for property, plant and equipment	1,172	466
Operating lease liabilities arising from obtaining right-of-use assets upon adoption of new lease guidance	0	39,775
Recognition of operating lease right-of-use asset during the year-to-date period	22,649	421
Recognition of financing lease right-of-use asset during the year-to-date period	1,457	251
Accrued distributions to equity investors	0	1
Accrued interest for notes	$ 0	467
Accrued debt issuance costs		2,970
Adjustment of embedded derivative related to debt extinguishment		$ 24,071