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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, 2020
Dec. 31, 2019
Dec. 31, 2018
Disclosure of operating segments [line items]      
Revenue $ 887,282 $ 671,835 $ 723,605
China [Member]      
Disclosure of operating segments [line items]      
Revenue 707,002 472,372 480,392
Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 123,180 129,257 168,122
Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 56,195 68,779 72,294
Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue 905 1,427 2,797
Driver IC [Member]      
Disclosure of operating segments [line items]      
Revenue 756,522 544,727 586,258
Driver IC [Member] | China [Member]      
Disclosure of operating segments [line items]      
Revenue 643,527 421,729 419,249
Driver IC [Member] | Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 88,001 90,971 136,526
Driver IC [Member] | Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 24,964 31,861 30,483
Driver IC [Member] | Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue 30 166 0
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 130,760 127,108 137,347
Non-driver products [Member] | China [Member]      
Disclosure of operating segments [line items]      
Revenue 63,475 50,643 61,143
Non-driver products [Member] | Taiwan [Member]      
Disclosure of operating segments [line items]      
Revenue 35,179 38,286 31,596
Non-driver products [Member] | Other Asia Pacific (Philippines, Korea and Japan)      
Disclosure of operating segments [line items]      
Revenue 31,231 36,918 41,811
Non-driver products [Member] | Europe and America [Member]      
Disclosure of operating segments [line items]      
Revenue $ 875 $ 1,261 $ 2,797