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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued liabilities    
Compensation and benefits $ 2,547 $ 1,745
Professional fees 360 408
LNG fuel and transportation 1,922 1,151
Accrued interest 35 21
Contract liabilities 238 357
Other taxes payable 435 328
Other accrued liabilities 393 351
Total accrued liabilities $ 5,930 $ 4,361