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Property, Plant and Equipment, Net (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Property, plant and equipment [Abstract]    
Property, plant and equipment, net $ 27,141 $ 27,805
Machinery and equipment    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 41,556 41,254
Less: accumulated depreciation and amortization (38,170) (37,311)
Building    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 29,832 29,600
Less: accumulated depreciation and amortization (10,011) (9,654)
Leasehold improvements    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross 4,975 4,942
Less: accumulated depreciation and amortization (3,751) (3,608)
Construction in progress    
Property, plant and equipment [Abstract]    
Property, plant and equipment, gross $ 2,710 $ 2,582