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Accrued Liabilities - Schedule of Accrued Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accrued liabilities    
Compensation and benefits $ 2,475 $ 907
Professional fees 619 827
LNG fuel and transportation 1,146 612
Accrued interest 59 220
Other taxes payable 311 100
Other operating expenses 785 247
Total Accrued Liabilities $ 5,395 $ 2,913