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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Accrued liabilities    
Compensation and benefits $ 2,641 $ 907
Professional fees 131 827
LNG fuel and transportation 1,582 612
Accrued interest 134 220
Other taxes payable 163 100
Contract liabilities 185 93
Other operating expenses 182 276
Total accrued liabilities $ 5,018 $ 3,035