Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2021	Mar. 31, 2022	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 20,865	$ 21,640
Less: accumulated depreciation and amortization	(19,505)	(19,991)
Property and equipment, net	1,360	1,649
Depreciation and amortization related to property, plant, and equipment	123	546	$ 509
Gain on sale of equipment	40	0	$ 0
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property and equipment, gross	14,748	$ 15,255
Estimated Useful Life (in years)		5 years
Computer equipment and software
Property, Plant and Equipment [Line Items]
Property and equipment, gross	836	$ 872
Estimated Useful Life (in years)		3 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property and equipment, gross	185	$ 179
Estimated Useful Life (in years)		7 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property and equipment, gross	4,959	$ 4,950
Estimated Useful Life (in years)		7 years
Construction in progress
Property, Plant and Equipment [Line Items]
Property and equipment, gross	$ 137	$ 384

Depreciation And Amortization On Property, Plant, And Equipment

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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 of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.

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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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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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