Revenues from Contracts with Customers and Other Revenue - Disaggregation of Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 17,200	$ 1,175
Renewable natural gas commodity
Disaggregation of Revenue [Line Items]
Total operating revenue	659	640
Environmental attribute revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	14,798	214
Licensing and development revenue
Disaggregation of Revenue [Line Items]
Total operating revenue	1,300	0
Other hydrocarbon revenue - ethanol, isooctane, IBA
Disaggregation of Revenue [Line Items]
Total operating revenue	$ 443	$ 321