CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
CONSOLIDATED STATEMENTS OF OPERATIONS
Total operating revenues	$ 16,915	$ 17,200
Operating expenses:
Cost of production	12,002	11,991
Depreciation and amortization	18,298	19,007
Research and development expense	5,576	6,637
General and administrative expense	45,798	42,628
Project development costs	18,166	14,732
Acquisition related costs	4,932
Facility idling costs	2,967	4,040
Total operating expenses	107,739	99,035
Loss from operations	(90,824)	(81,835)
Other income (expense)
Interest expense	(3,879)	(2,161)
Interest and investment income	15,740	19,090
Other income (expense), net	323	(1,309)
Total other income, net	12,184	15,620
Net loss	$ (78,640)	$ (66,215)
Net loss per share - basic (in dollars per share)	$ (0.34)	$ (0.28)
Net loss per share - diluted (in dollars per share)	$ (0.34)	$ (0.28)
Weighted-average number of common shares outstanding - basic (in shares)	231,674,716	238,687,621
Weighted-average number of common shares outstanding - diluted (in shares)	231,674,716	238,687,621