Supplementary Balance Sheet Information - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 32,964	$ 32,896
Accumulated depreciation	(24,111)	(23,978)
Total property and equipment, net	8,853	8,918
Land
Property, Plant and Equipment [Line Items]
Gross property and equipment	805	805
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property and equipment	4,832	4,823
Machinery and equipment
Property, Plant and Equipment [Line Items]
Gross property and equipment	24,940	24,881
Computer hardware and software
Property, Plant and Equipment [Line Items]
Gross property and equipment	$ 2,387	$ 2,387