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Segment, Product and Geographic Information - Segment revenues from customers in different geographic region (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Disclosure of operating segments [line items]      
Revenue $ 671,835 $ 723,605 $ 685,167
China [Member]      
Disclosure of operating segments [line items]      
Revenue 472,372 480,392 421,208
Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 129,257 168,122 176,951
Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 68,779 72,294 67,779
Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue 1,427 2,797 19,229
Driver IC [Member]      
Disclosure of operating segments [line items]      
Revenue 544,727 586,258 529,847
Driver IC [Member] | China [Member]      
Disclosure of operating segments [line items]      
Revenue 421,729 419,249 353,505
Driver IC [Member] | Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 90,971 136,526 146,302
Driver IC [Member] | Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 31,861 30,483 30,040
Driver IC [Member] | Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue 166 0 0
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 127,108 137,347 155,320
Non-driver products [Member] | China [Member]      
Disclosure of operating segments [line items]      
Revenue 50,643 61,143 67,703
Non-driver products [Member] | Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 38,286 31,596 30,649
Non-driver products [Member] | Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 36,918 41,811 37,739
Non-driver products [Member] | Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue $ 1,261 $ 2,797 $ 19,229