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, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Property and equipment
Less accumulated depreciation	$ (1,458)		$ (1,458)		$ (1,347)
Property and equipment, net	74		74		185
Depreciation			100	$ 500
Maximum
Property and equipment
Depreciation	100	$ 100
Office equipment and furniture
Property and equipment
Property and equipment, gross	152		152		152
Laboratory equipment
Property and equipment
Property and equipment, gross	401		401		401
Leasehold improvements
Property and equipment
Property and equipment, gross	$ 979		$ 979		$ 979