Leases, Right-of-Use Assets and Related Liabilities - Narrative (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2022 USD ($) site contract	Jun. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Leases [Abstract]
Operating right-of-use assets	$ 2,098		$ 2,414
Total lease liabilities	2,209
Operating lease liabilities (current)	423		772
Operating lease liabilities (long-term)	$ 1,786		1,902
Number of finance lease | contract	4
Number of digester sites | site	3
Right-of-use asset purchased with financing leases	$ 834	$ 27,775
Finance right-of-use assets	27,477		$ 27,297
Finance lease liability	$ 22,635