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Segment, Product and Geographic Information (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]    
Revenue $ 723,605 $ 685,167
China [Member]    
Disclosure of operating segments [line items]    
Revenue 480,392 421,208
Taiwan [Member]    
Disclosure of operating segments [line items]    
Revenue 168,122 176,951
Other Asia Pacific (Philippines, Korea and Japan)    
Disclosure of operating segments [line items]    
Revenue 72,294 67,779
Europe and America [Member]    
Disclosure of operating segments [line items]    
Revenue 2,797 19,229
Driver IC [Member]    
Disclosure of operating segments [line items]    
Revenue 586,258 529,847
Driver IC [Member] | China [Member]    
Disclosure of operating segments [line items]    
Revenue 419,249 353,505
Driver IC [Member] | Taiwan [Member]    
Disclosure of operating segments [line items]    
Revenue 136,526 146,302
Driver IC [Member] | Other Asia Pacific (Philippines, Korea and Japan)    
Disclosure of operating segments [line items]    
Revenue 30,483 30,040
Driver IC [Member] | Europe and America [Member]    
Disclosure of operating segments [line items]    
Revenue 0 0
Non-driver products [Member]    
Disclosure of operating segments [line items]    
Revenue 137,347 155,320
Non-driver products [Member] | China [Member]    
Disclosure of operating segments [line items]    
Revenue 61,143 67,703
Non-driver products [Member] | Taiwan [Member]    
Disclosure of operating segments [line items]    
Revenue 31,596 30,649
Non-driver products [Member] | Other Asia Pacific (Philippines, Korea and Japan)    
Disclosure of operating segments [line items]    
Revenue 41,811 37,739
Non-driver products [Member] | Europe and America [Member]    
Disclosure of operating segments [line items]    
Revenue $ 2,797 $ 19,229