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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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services 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 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property and equipment
Gross property and equipment	$ 9,512		$ 9,512		$ 9,178
Accumulated Depreciation	(7,005)		(7,005)		(6,536)
Property and Equipment, net	2,507		2,507		2,642
Depreciation expense	100	$ 200	500	$ 600
Leasehold Improvements
Property and equipment
Gross property and equipment	1,196		1,196		1,196
Machinery and Equipment
Property and equipment
Gross property and equipment	5,794		5,794		5,475
Information Technology & Office Equipment
Property and equipment
Gross property and equipment	1,846		1,846		1,831
Laboratory Equipment
Property and equipment
Gross property and equipment	$ 676		$ 676		$ 676