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Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 4,779	$ 4,682
Less—accumulated depreciation and amortization	(3,459)	(3,413)
Property and equipment, net	1,320	1,269
Furniture and office equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	1,066	1,066
Leasehold improvements
Property, equipment and depreciation and amortization
Property and equipment, gross	2,560	2,560
Laboratory equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 1,153	$ 1,056

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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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