Supplementary Balance Sheet Information - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 63,763	$ 63,863
Less accumulated depreciation	(45,634)	(41,725)
Total property and equipment, net	18,129	22,138
Land
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	995	995
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	5,452	5,451
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, and equipment, gross	$ 57,316	$ 57,417

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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