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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Prepaid expenses and other current assets    
Prepaid LNG $ 55 $ 189
Prepaid insurance 967 698
Prepaid supplier expenses 295 229
Other receivables 2,046 1,655
Deposits 192 347
Other 157 465
Prepaid expenses and other current expenses $ 3,712 $ 3,583