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Segment, Product and Geographic Information - Segment revenues from major product lines (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
Large-sized applications [Member]      
Disclosure of operating segments [line items]      
Revenue 240,789 237,276 260,540
Small And Medium Sized Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 515,733 307,451 325,718
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 130,760 127,108 137,347
Driver IC [Member]      
Disclosure of operating segments [line items]      
Revenue 756,522 544,727 586,258
Driver IC [Member] | Large-sized applications [Member]      
Disclosure of operating segments [line items]      
Revenue 240,789 237,276 260,540
Driver IC [Member] | Small And Medium Sized Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 515,733 307,451 325,718
Driver IC [Member] | Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue 130,760 127,108 137,347
Non-driver products [Member] | Large-sized applications [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member] | Small And Medium Sized Applications [Member]      
Disclosure of operating segments [line items]      
Revenue 0 0 0
Non-driver products [Member] | Non-driver products [Member]      
Disclosure of operating segments [line items]      
Revenue $ 130,760 $ 127,108 $ 137,347