Debt - SG Credit and TOTAL Credit Support Agreement (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 02, 2019	Dec. 31, 2021	Mar. 12, 2021	Mar. 03, 2021	Dec. 31, 2020
Long-term debt [Line Items]
Outstanding amount		$ 36,132			$ 85,797
Proceeds from revolving line of credit		1,450
Term Loan Facility
Long-term debt [Line Items]
Outstanding amount		9,500			$ 5,100
Term Loan Facility | Socit Gnrale
Long-term debt [Line Items]
Maximum borrowing capacity (up to)	$ 100,000
Commitment fee percentage	0.39%
Quarterly principal payments		2,500
Covenant for debt default	$ 20,000
Outstanding amount		$ 9,500
Term Loan Facility | Socit Gnrale | London Interbank Offered Rate (LIBOR)
Long-term debt [Line Items]
Basis spread on variable rate	1.30%
Term Loan Facility | Socit Gnrale | Station Build Costs
Long-term debt [Line Items]
Maximum borrowing capacity (up to)			$ 45,000
Term Loan Facility | Socit Gnrale | ADG RNG Production Facilities
Long-term debt [Line Items]
Maximum borrowing capacity (up to)			$ 20,000	$ 20,000
Term Loan Facility | Total Holdings USA Inc.
Long-term debt [Line Items]
Maximum borrowing capacity (up to)	$ 100,000
Interest rate per quarter	2.50%
Covenant for debt default	$ 20,000
Term Loan Facility | Total Holdings USA Inc. | London Interbank Offered Rate (LIBOR)
Long-term debt [Line Items]
Basis spread on variable rate	1.00%