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Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 4,613	$ 3,823
Less—accumulated depreciation and amortization	(3,475)	(3,441)
Property and equipment, net	1,138	382
Furniture and office equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	1,212	955
Leasehold improvements
Property, equipment and depreciation and amortization
Property and equipment, gross	2,445	1,962
Laboratory equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 956	$ 906

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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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