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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Prepaid expenses and other current assets    
Prepaid LNG $ 93 $ 90
Prepaid insurance 501 734
Prepaid supplier expenses 311 299
Other receivables 1,969 1,521
Deposits 310 285
Other 152 182
Prepaid expenses and other current expenses $ 3,336 $ 3,111