Balance Sheet Items - Accrued Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accrued other liabilities	$ 2,249	$ 748
Accrued clinical trial liability	985	841
Accrued expenses	$ 3,234	$ 1,589	$ 1,589

Amount of expenses incurred but not yet paid classified as other, due within one year or the normal operating cycle, if longer.

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