Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, plant and equipment [Abstract]
Property, plant and equipment, net	$ 31,141	$ 31,422
Machinery and equipment
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	41,059	40,899
Less: accumulated depreciation and amortization	(36,903)	(36,044)
Building
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	30,585	30,388
Less: accumulated depreciation and amortization	(9,518)	(9,170)
Leasehold improvements
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	5,087	5,059
Less: accumulated depreciation and amortization	(3,448)	(3,306)
Construction in progress
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 4,279	$ 3,596