CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities
Net loss	$ (40,436)	$ (37,133)
Adjustments to reconcile net loss to net cash used in operating activities
Equity-based compensation	6,438	1,142
Fair value change of warrants	1,340	13,262
Depreciation expense	1,693	985
Amortization of debt issuance costs and debt discounts	492	1,508
Amortization of premium on debt securities	20	165
Operating lease amortization expense	531	0
Issuance costs attributable to warrants	0	109
Gain on extinguishment of secured term loan	0	(314)
Changes in operating assets and liabilities
Prepaid expenses and other current assets	(3,572)	(2,899)
Prepaid expenses and other non-current assets	(875)	(1,485)
Accounts payable	1,094	(725)
Accrued expenses	(1,649)	(13,082)
Accrued interest	0	(1,251)
Deferred revenue	0	5,000
Operating right-of-use liabilities	(166)	0
Net cash used in operating activities	(35,090)	(34,718)
Cash flows from investing activities
Construction of plant	(127,067)	(50,493)
Purchase of debt securities, available for sale	(177,755)	(200,703)
Sale and maturity of debt securities, available for sale	112,968	0
Net cash used in investing activities	(191,854)	(251,196)
Cash flows from financing activities
Proceeds from issuance of common stock	206,071	0
Proceeds from issuance of warrants	43,929	0
Payments to repurchase shares	(1,066)	0
Common stock issuance costs	(775)	0
Other (payments) proceeds from financing activities	(23)	0
Proceeds from ROCH and PIPE financing, net of issuance costs	0	298,461
Bond issuance costs	0	(4,067)
Convertible notes issuance costs	0	(480)
Net cash provided by financing activities	248,136	293,914
Net increase in cash and restricted cash	21,192	8,000
Cash and restricted cash, beginning of period	263,858	330,574
Cash and restricted cash, end of period	285,050	338,574
Non-cash operating activities
Interest paid during the period, net of capitalized interest	650	845
Non-cash investing activities
Additions to property, plant, and equipment in accrued expenses	22,059	26,404
Additions to property, plant, and equipment in accounts payable	3,267	268
Additions to property, plant, and equipment in accrued interest	0	277
Non-cash financing activities
Initial fair value of acquired warrant liability	0	4,604
PIK interest on convertible notes	$ 0	$ 1,680