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Segment, Product and Geographic Information (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 54,461 $ 57,271
Taiwan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 53,413 56,128
China [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 914 951
U.S. [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 63 114
Japan [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net 32 42
Korea [Member]    
Segment Reporting Tangible Long Lived Asset [Line Items]    
Property, plant and equipment, net $ 39 $ 36