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Segment, Product and Geographic Information - Revenues from significant customers (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
Driver IC Segment [Member]      
Disclosure of operating segments [line items]      
Revenue 429,050 272,020 305,512
Driver IC Segment [Member] | Customer A and Its Affiliates [Member]      
Disclosure of operating segments [line items]      
Revenue 264,700 182,442 178,907
Driver IC Segment [Member] | Customer B and Its Affiliates [Member]      
Disclosure of operating segments [line items]      
Revenue 54,439 56,260 87,927
Driver IC Segment [Member] | Customer C [Member]      
Disclosure of operating segments [line items]      
Revenue 109,911 33,318 38,678
Non-driver Products Segment [Member]      
Disclosure of operating segments [line items]      
Revenue 31,462 23,822 29,932
Non-driver Products Segment [Member] | Customer A and Its Affiliates [Member]      
Disclosure of operating segments [line items]      
Revenue 24,963 15,988 24,088
Non-driver Products Segment [Member] | Customer B and Its Affiliates [Member]      
Disclosure of operating segments [line items]      
Revenue 3,906 3,521 2,917
Non-driver Products Segment [Member] | Customer C [Member]      
Disclosure of operating segments [line items]      
Revenue $ 2,593 $ 4,313 $ 2,927