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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued liabilities    
Compensation and benefits $ 1,745 $ 2,641
Professional fees 408 131
LNG fuel and transportation 1,151 1,582
Accrued interest 21 134
Contract liabilities 357 185
Other taxes payable 328 163
Other accrued liabilities 351 182
Total accrued liabilities $ 4,361 $ 5,018