Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
Property, plant and equipment, gross	$ 4,588	$ 4,899
Less: Accumulated depreciation	(4,355)	(4,131)
Property, plant and equipment, net	233	768
IT equipment
Property, Plant and Equipment
Property, plant and equipment, gross	1,083	1,077
Laboratory equipment
Property, Plant and Equipment
Property, plant and equipment, gross	3,404	3,392
ROU asset
Property, Plant and Equipment
Property, plant and equipment, gross		226
Other equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 101	$ 204

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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