Liquidity and Going Concern Uncertainty (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash	$ 6,586	$ 4,025	$ 9,000	$ 5,277
Available cash	6,525	3,964	8,939
Restricted cash	61	61	$ 61
Working capital	(7,469)
Net loss	4,539	3,433
Net cash used in operating activities	$ 2,404	$ 1,235