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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Prepaid expenses and other current assets    
Prepaid LNG $ 86 $ 90
Prepaid insurance 403 734
Prepaid supplier expenses 276 299
Other receivables 2,242 1,521
Deposits 335 285
Other 222 182
Total prepaid expenses and other current assets $ 3,564 $ 3,111