Property, Plant and Equipment (Details) - USD ($) $ in Thousands	9 Months Ended
Sep. 30, 2020	Dec. 31, 2019
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 54,918	$ 54,775
Accumulated depreciation	(31,750)	(32,020)
Total property, plant and equipment, net	23,168	22,755
Automobiles
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 23	23
Automobiles \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	5 years
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,056	3,830
Leasehold improvements \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	4 years
Leasehold improvements \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	20 years
Computer software and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 32,229	26,816
Computer software and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	2 years
Computer software and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	7 years
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 15,170	18,551
Machinery and equipment \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	3 years
Machinery and equipment \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	5 years
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,586	2,808
Furniture and fixtures \| Minimum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	5 years
Furniture and fixtures \| Maximum
Property, Plant and Equipment [Line Items]
Estimated Useful Life (in years)	20 years
Work in Progress
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,854	$ 2,747

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.

+ References

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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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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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