Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Balance Sheet Items - Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021
Property, Plant and Equipment [Line Items]
Property and equipment	$ 1,956	$ 1,937
Less accumulated depreciation	(932)	(824)
Property and equipment — net	1,024	1,113	$ 1,113
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment	162	156
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment	203	193
Lab equipment
Property, Plant and Equipment [Line Items]
Property and equipment	751	748
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment	$ 840	$ 840