Property, Plant and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, plant and equipment [Abstract]
Property, plant and equipment, net	$ 30,178	$ 31,422
Machinery and equipment
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	40,960	40,899
Less: accumulated depreciation and amortization	(36,754)	(36,044)
Building
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	29,690	30,388
Less: accumulated depreciation and amortization	(9,520)	(9,170)
Leasehold improvements
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	4,958	5,059
Less: accumulated depreciation and amortization	(3,489)	(3,306)
Construction in progress
Property, plant and equipment [Abstract]
Property, plant and equipment, gross	$ 4,333	$ 3,596