CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Total operating revenues	$ 1,175	$ 533
Operating expenses:
Cost of production	8,698	7,687
Depreciation and amortization	7,887	5,128
Research and development expense	7,427	6,775
General and administrative expense	39,941	25,493
Project development costs	10,061	10,581
Facility idling costs	4,599	0
Impairment loss	24,749	0
Loss on disposal of assets	499	5,137
Total operating expenses	103,861	60,801
Loss from operations	(102,686)	(60,268)
Other income (expense)
Interest expense	(1,167)	(251)
Investment income (loss)	3,043	571
Gain on forgiveness of SBA loan	0	641
Other income, net	2,803	104
Total other income, net	4,679	1,065
Net loss	$ (98,007)	$ (59,203)
Net loss per share - basic (in dollars per share)	$ (0.44)	$ (0.30)
Net loss per share - diluted (in dollars per share)	$ (0.44)	$ (0.30)
Weighted-average number of common shares outstanding - basic (in shares)	221,537,262	195,794,606
Weighted-average number of common shares outstanding - diluted (in shares)	221,537,262	195,794,606