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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Prepaid expenses and other current assets    
Prepaid LNG $ 51 $ 90
Prepaid insurance 1,385 734
Prepaid supplier expenses 326 299
Other receivables 1,923 1,521
Deposits 360 285
Other 253 182
Total prepaid expenses and other current assets $ 4,298 $ 3,111