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Segment, Product and Geographic Information (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 48,172 $ 54,461
Taiwan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 47,144 53,413
China [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 767 914
U.S. [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 61 63
Japan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 21 32
Korea [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 179 $ 39