CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Revenue and cost of goods sold
Total operating revenues	$ 4,238	$ 89	$ 8,298	$ 321
Operating expenses:
Cost of production	1,931	1,834	6,356	4,924
Depreciation and amortization	4,754	1,474	9,329	2,916
Research and development expense	1,960	1,966	3,158	3,158
General and administrative expense	10,608	8,694	21,369	18,061
Project development costs	2,887	2,236	5,846	3,332
Facility idling costs	1,013	0	2,012	0
Total operating expenses	23,153	16,204	48,070	32,391
Loss from operations	(18,915)	(16,115)	(39,772)	(32,070)
Other income (expense)
Interest expense	(536)	(2)	(1,075)	(4)
Interest and investment income	5,038	78	8,822	330
Other income (expense), net	(7)	2,878	(13)	2,910
Total other income, net	4,495	2,954	7,734	3,236
Net loss	$ (14,420)	$ (13,161)	$ (32,038)	$ (28,834)
Net loss per share - basic (in dollars per share)	$ (0.06)	$ (0.06)	$ (0.13)	$ (0.14)
Net loss per share - diluted (in dollars per share)	$ (0.06)	$ (0.06)	$ (0.13)	$ (0.14)
Weighted-average number of common shares outstanding - basic (in shares)	237,417,618	209,809,994	237,339,583	205,889,651
Weighted-average number of common shares outstanding - diluted (in shares)	237,417,618	209,809,994	237,339,583	205,889,651