Property, Plant and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 39,114	$ 45,517
Accumulated depreciation	(23,287)	(28,049)
Total property, plant and equipment, net	15,827	17,468
Depreciation expense	5,387	4,320	$ 2,558
Automobiles [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 23	139
Automobiles [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	5 years
Automobiles [Member] | Maximum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	6 years
Leasehold improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 3,542	3,388
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	$ 17,024	25,899
Computer equipment [Member] | Minimum
Property, Plant and Equipment [Line Items]
Estimated useful life (in years)	3 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	$ 15,178	13,085
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	$ 2,295	2,238
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	$ 1,052	$ 768