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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Accrued liabilities    
Compensation and benefits $ 1,709 $ 2,641
Professional fees 364 131
LNG fuel and transportation 1,051 1,582
Accrued interest 9 134
Contract liabilities 402 185
Other taxes payable 383 163
Other operating expenses 198 182
Total accrued liabilities $ 4,116 $ 5,018