UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (45,791)	$ (21,456)
Adjustment to reconcile net loss to net cash used in operating activities
Stock-based compensation	3,943	2,478
Depreciation and amortization	995	485
Non-cash lease expense	192	159
Income from equity in unconsolidated joint venture	0	(440)
Accreted interest on convertible note payable - related party	543	0
Amortization of debt issuance cost	87	0
Change in fair value, embedded derivative - related party	(7,695)	0
Change in fair value, warrants liability - related party	(567)	224
Changes in operating assets and liabilities:
Prepaid expenses	102	261
Inventory	2,684	122
Accounts receivable	(768)	(184)
Vendor deposits	(2,258)	(466)
Security deposits	11	20
Accounts payable	(1,172)	789
Accrued expenses	5,126	54
Accounts payable and accrued expenses - related parties	(1,200)	8,719
Provision for firm purchase commitments	0	(1,585)
Operating lease liabilities	(179)	(148)
Contract liabilities	2,074	750
Interest payable - related party	1,544	0
Note payable	167	0
Other	(570)	515
Net cash used in operating activities	(42,732)	(9,703)
Cash flows from investing activities
Investment in notes receivable	0	(2,870)
Investment in joint venture	0	(4,000)
Purchases of property, plant and equipment	(5,132)	(4,490)
Net cash used in investing activities	(5,132)	(11,360)
Cash flows from financing activities
Principal payments on finance (capital) lease obligations	(4)
Principal payments on finance (capital) lease obligations		(3)
Proceeds from exercise of public warrants	7	0
Repurchase of shares from employees for income tax withholding purposes	(826)	0
Repayment of other financing	0	(70)
Repayment of equipment financing facility	(389)	0
Net cash used in financing activities	(1,212)	(73)
Net decrease in cash, cash equivalents and restricted cash	(49,076)	(21,136)
Cash, cash equivalents and restricted cash, beginning of the period	105,692	121,853
Cash, cash equivalents and restricted cash, end of the period	56,616	100,717
Non-cash investing and financing activities
Accrued and unpaid capital expenditures	878	0
Right-of-use operating lease assets in exchange for lease liabilities	2,112	3,662
Supplemental disclosures
Cash paid for interest	$ 224	$ 51