Revenues from Contracts with Customers and Other Revenues - Contracts with Customers (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 4,238	$ 89	$ 8,298	$ 321
Renewable natural gas commodity
Disaggregation of Revenue [Line Items]
Total operating revenues	140	0	270	0
Environmental attribute revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	2,777	0	6,310	0
Licensing and development revenue
Disaggregation of Revenue [Line Items]
Total operating revenues	1,300	0	1,300	0
Other hydrocarbon revenue - ethanol, isooctane, IBA
Disaggregation of Revenue [Line Items]
Total operating revenues	$ 21	$ 89	$ 418	$ 321