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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The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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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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Property and equipment, net (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Property and equipment, net
Property and equipment, gross	$ 6,854		$ 6,854		$ 6,349
Less: Accumulated depreciation and amortization	(4,501)		(4,501)		(4,032)
Property and equipment, net	2,353		2,353		2,317
Depreciation expense	300	$ 300	700	$ 600
Laboratory equipment
Property and equipment, net
Property and equipment, gross	6,119		6,119		5,583
Leasehold improvements
Property and equipment, net
Property and equipment, gross	386		386		383
Computer equipment and software
Property and equipment, net
Property and equipment, gross	143		143		188
Furniture and office equipment
Property and equipment, net
Property and equipment, gross	$ 206		$ 206		$ 195