Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property, Plant and Equipment
Property, plant and equipment, gross	$ 4,899	$ 6,247
Less: Accumulated depreciation	(4,131)	(3,773)
Property, plant and equipment, net	768	2,474
IT equipment
Property, Plant and Equipment
Property, plant and equipment, gross	1,077	1,060
Laboratory equipment
Property, Plant and Equipment
Property, plant and equipment, gross	3,392	3,375
ROU asset
Property, Plant and Equipment
Property, plant and equipment, gross	226	1,647
Other equipment
Property, Plant and Equipment
Property, plant and equipment, gross	$ 204	$ 165

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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