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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Prepaid expenses and other current assets    
Prepaid LNG $ 65 $ 92
Prepaid insurance 361 1,024
Prepaid supplier expenses 261 252
Other receivables and contract assets 2,001 946
Deposits 298 253
Fair value of natural gas derivatives, current 627 0
Other 185 197
Total prepaid expenses and other current assets $ 3,798 $ 2,764