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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 [Abstract]      
Property, plant and equipment, net $ 27,805 $ 31,422  
Depreciation and amortization 4,865 5,494 $ 5,639
Machinery and equipment      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 41,254 40,899  
Less: accumulated depreciation and amortization (37,311) (36,044)  
Building      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 29,600 30,388  
Less: accumulated depreciation and amortization (9,654) (9,170)  
Leasehold improvements      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross 4,942 5,059  
Less: accumulated depreciation and amortization (3,608) (3,306)  
Construction in progress      
Property, plant and equipment [Abstract]      
Property, plant and equipment, gross $ 2,582 $ 3,596