Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Prepaid expenses and other current assets
Prepaid LNG	$ 59	$ 189
Prepaid insurance	259	698
Prepaid supplier expenses	433	229
Other receivables	1,021	1,655
Deposits	193	347
Other	149	465
Prepaid expenses and other current expenses	$ 2,114	$ 3,583