Property, Plant, and Equipment - Property, Plant, and Equipment (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 183,470	$ 157,752
Less: accumulated depreciation	(92,074)	(79,704)
Property, plant and equipment, net, total	91,396	78,048
Land [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,951	3,951
Building [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	24,533	24,589
Building Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	45,067	33,189
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	9,095	6,513
Computer Hardware And Software [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	66,542	61,835
Manufacturing Test Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	27,378	21,312
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 6,904	$ 6,363