Property, Plant, and Equipment, Net (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	$ 162,430,000	$ 144,787,000
Accumulated depreciation	(87,703,000)	(74,766,000)
Property, plant and equipment, net, excluding contruction in progress	74,727,000	70,021,000
Construction in progress	843,000	7,685,000
Total property, plant, and equipment, net	75,570,000	77,706,000
Depreciation expense	14,200,000	13,400,000	13,100,000
Buildings
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	51,901,000	44,607,000
Construction in progress	0	5,639,000
Machinery and equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	48,859,000	44,168,000
Construction in progress	158,000	594,000
Tooling
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	26,495,000	24,496,000
Construction in progress	134,000	395,000
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	17,749,000	16,153,000
Construction in progress	104,000	285,000
Software
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	8,504,000	7,373,000
Construction in progress	372,000	742,000
Furniture and fixtures
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	6,231,000	5,360,000
Computer equipment
Property, Plant and Equipment [Line Items]
Property, plant and equipment, gross	2,691,000	2,630,000
Other
Property, Plant and Equipment [Line Items]
Construction in progress	75,000	30,000
People's Republic of China
Property, Plant and Equipment [Line Items]
Total property, plant, and equipment, net	$ 68,200,000	$ 69,200,000