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Supplementary Balance Sheet Information - Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 3,613	$ 3,628
Less—accumulated depreciation and amortization	(3,109)	(3,004)
Property and equipment, net	504	624
Furniture and office equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	798	798
Leasehold improvements
Property, equipment and depreciation and amortization
Property and equipment, gross	1,962	1,962
Laboratory equipment
Property, equipment and depreciation and amortization
Property and equipment, gross	$ 853	$ 868

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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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