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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Prepaid expenses and other current assets    
Prepaid LNG $ 66 $ 189
Prepaid insurance 458 698
Prepaid supplier expenses 318 229
Other receivables 1,209 1,655
Deposits 193 347
Other 135 465
Prepaid expenses and other current expenses $ 2,379 $ 3,583