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Accounts Payable and Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accounts Payable and Accrued Liabilities [Line Items]    
Accounts payable $ 3,378 $ 4,830
Accrued payroll and related benefits 3,454 4,678
Total accounts payable and accrued liabilities 18,750 28,288
NW Lowa RNG    
Accounts Payable and Accrued Liabilities [Line Items]    
Accrued liabilities 11,519 18,345
Net Zero Segment    
Accounts Payable and Accrued Liabilities [Line Items]    
Other accrued liabilities $ 399 $ 435