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Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 4,022	$ 3,823
Less—accumulated depreciation and amortization	(3,472)	(3,441)
Property and equipment, net	550	382
Furniture and office equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	1,064	955
Leasehold improvements
Property, equipment and depreciation and amortization
Property and equipment, gross	2,046	1,962
Laboratory equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 912	$ 906

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- Definition

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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