Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Operating Activities
Net loss	$ (59,203)	$ (40,186)	$ (28,660)
Adjustments to reconcile net loss to net cash used in operating activities:
Loss (gain) from the change in fair value of 2020/21 Notes and 2020 Notes embedded derivative liability	0	8,607	(394)
Loss on conversion of 2020/21 Notes to common stock	0	1,916	0
Loss on disposal of assets	5,137	625	4
(Gain) on forgiveness of SBA Loans	(641)	0	0
Stock-based compensation	9,874	2,125	1,349
Depreciation and amortization	5,128	5,904	6,656
Non-cash lease expense	52	62	48
Non-cash interest expense	37	761	1,346
Changes in operating assets and liabilities:
Accounts receivable	(257)	608	(609)
Inventories	(259)	945	(35)
Prepaid expenses and other current assets, deposits and other assets	(3,133)	782	(1,824)
Accounts payable, accrued expenses and long-term liabilities	(271)	(1,487)	1,280
Net cash used in operating activities	(43,536)	(19,338)	(20,839)
Investing Activities
Acquisitions of property, plant and equipment	(59,662)	(5,905)	(5,989)
Acquisition of patents	(9,170)	0	0
Proceeds from sale of marketable securities	79,574	0	0
Purchase of marketable securities	(422,362)	0	0
Proceeds from sale of property, plant and equipment	0	0	32
Investment in Juhl	0	0	(1,500)
Net cash used in investing activities	(411,620)	(5,905)	(7,457)
Financing Activities
Proceeds from issuance of 2021 Bonds	68,995	0	0
Debt and equity offering costs	(34,955)	(6,370)	(232)
Proceeds from issuance of common stock and common stock warrants	489,373	76,414	11,589
Proceeds from the exercise of warrants	1,121	17,082	0
Net settlement of common stock under stock plans	(7,041)	(350)	(201)
Payment on loans payable - other	(154)	(501)	(292)
Payment of finance lease liabilities	(4,488)	(2)	0
Proceeds from SBA Loans	0	1,006	0
Net cash provided by financing activities	512,851	87,279	10,864
Net increase (decrease) in cash and cash equivalents and restricted cash	57,695	62,036	(17,432)
Cash, cash equivalents and restricted cash
Beginning of year	78,338	16,302	33,734
End of year	136,033	78,338	16,302
Cash and cash equivalents	40,833	78,338	16,302
Restricted cash (current)	25,032	0	0
Long-term restricted cash	70,168	0	0
Total cash, cash equivalents and restricted cash	136,033	78,338	16,302
Supplemental disclosures of cash and non-cash investing and financing transactions
Cash paid for interest expensed	214	1,333	1,392
Cash paid for interest capitalized to construction in progress	1,020	0	0
Non-cash interest capitalized to construction in progress	1,125	0	0
Non-cash purchase of property, plant and equipment	20,287	197	368
Issuance of common stock upon exchange of debt and make-whole	0	25,057	0
Issuance of common stock in exchange for services rendered	0	94	0
Original issue discount paid with 2020/21 Notes	0	282	0
Right-of-use asset purchased with financing lease	28,514	0	0
Right-of-use asset purchased with operating lease	2,593	192	280
Equipment and insurance financed with notes payable	$ 0	$ 0	$ 1,041