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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued liabilities    
Compensation and benefits $ 3,134 $ 1,745
Professional fees 623 408
LNG fuel and transportation 2,507 1,151
Accrued interest 0 21
Contract liabilities 288 357
Other taxes payable 582 328
Other accrued liabilities 298 351
Total accrued liabilities $ 7,432 $ 4,361