Revenues from Contracts with Customers and Other Revenues - Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 4,528	$ 309	$ 12,826	$ 630
Renewable natural gas commodity
Disaggregation of Revenue [Line Items]
Total operating revenues	187	309	457	309
Environmental attribute revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	4,330	0	10,640	0
Licensing and development revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	0	0	1,300	0
Other hydrocarbon revenue - ethanol, isooctane, IBA
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 11	$ 0	$ 429	$ 321