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Accrued Liabilities
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Liabilities Accrued Liabilities
    The Company’s accrued liabilities consisted of the following (in thousands):
March 31,
2021
December 31,
2020
Compensation and benefits$1,957 $1,745 
Professional fees390 408 
LNG fuel and transportation2,016 1,151 
Accrued interest31 21 
Contract liabilities44 357 
Other taxes payable454 328 
Other accrued liabilities340 351 
Total accrued liabilities$5,232 $4,361