Schedule of Long-term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Disclosure [Abstract]
Amounts due under term loan	$ 12,000	$ 12,000
Accrued end-of-term payments	115	83
Less: unamortized debt issuance costs	(271)	(296)
Long-term debt, less issuance costs	$ 11,844	$ 11,787