CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Income Statement [Abstract]
Total operating revenues	$ 4,060	$ 232
Operating expenses:
Cost of production	4,425	3,090
Depreciation and amortization	4,575	1,442
Research and development expense	1,198	1,192
General and administrative expense	10,761	9,367
Project development costs	2,959	1,096
Facility idling costs	999	0
Total operating expenses	24,917	16,187
Loss from operations	(20,857)	(15,955)
Other income (expense)
Interest expense	(539)	(2)
Investment income	3,067	252
Other income, net	711	32
Total other income, net	3,239	282
Net loss	$ (17,618)	$ (15,673)
Net loss per share - basic (in dollars per share)	$ (0.07)	$ (0.08)
Net loss per share - diluted (in dollars per share)	$ (0.07)	$ (0.08)
Weighted-average number of common shares outstanding - basic (in shares)	237,260,681	201,925,747
Weighted-average number of common shares outstanding - diluted (in shares)	237,260,681	201,925,747