Other Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Other Liabilities, Current
Unearned insurance premiums	$ 638	$ 256
Other Liabilities
Unearned insurance premiums	942	1,680
Other long-term liabilities	119	135
Other liabilities	$ 1,061	1,959
Historic Warrant Liability
Other Liabilities
Historic warrants liability		$ 144