Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017		Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 48,754	$ 39,114
Accumulated depreciation	(26,538)	(23,287)
Total property, plant and equipment, net	22,216	15,827	[1]
Depreciation expense	5,778	5,387		$ 4,320
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 23	23
Automobiles [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,782	3,542
Leasehold improvements [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	4 years
Leasehold improvements [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Computer equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 23,776	17,024
Computer equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	2 years
Computer equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	7 years
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 16,756	15,178
Machinery and equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 years
Machinery and equipment [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 2,827	2,295
Furniture and fixtures [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Furniture and fixtures [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	20 years
Work in progress [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 1,590	$ 1,052

[1] See Note 4.