Property, Plant, and Equipment, Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 191,041	$ 175,908
Accumulated depreciation	(101,768)	(96,365)
Property, plant and equipment, net, excluding construction in progress	89,273	79,543
Construction in progress	16,078	10,472
Total property, plant, and equipment, net	105,351	90,015
Depreciation expense	20,700	15,600	$ 14,100
People's Republic of China (PRC)
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, net	90,000	79,400
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48,367	50,044
Construction in progress	118	105
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	67,726	60,078
Construction in progress	4,625	6,620
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	31,773	26,231
Construction in progress	2,219	1,265
Leasehold and building improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	22,680	19,926
Construction in progress	1,335	244
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	11,581	11,067
Construction in progress	7,674	1,888
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	3,794	4,005
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	5,120	4,557
Other
Property, Plant and Equipment [Line Items]
Construction in progress	$ 107	$ 350