Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Prepaid expenses and other current assets
Prepaid LNG	$ 0	$ 92
Prepaid insurance	692	1,024
Prepaid supplier expenses	324	252
Other receivables and contract assets	2,064	946
Deposits	300	253
Other	243	197
Total prepaid expenses and other current assets	$ 3,623	$ 2,764