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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment, Product and Geographic Information      
Revenues $ 906,802 $ 945,428 $ 1,201,339
China      
Segment, Product and Geographic Information      
Revenues 665,558 720,758 925,429
Taiwan      
Segment, Product and Geographic Information      
Revenues 138,328 141,783 175,544
Korea      
Segment, Product and Geographic Information      
Revenues 61,687 27,397 19,111
Japan      
Segment, Product and Geographic Information      
Revenues 24,575 36,797 63,409
America      
Segment, Product and Geographic Information      
Revenues 12,545 14,150 9,361
Mexico      
Segment, Product and Geographic Information      
Revenues 2,807 627  
Others      
Segment, Product and Geographic Information      
Revenues 1,302 3,916 8,485
Driver IC      
Segment, Product and Geographic Information      
Revenues 751,326 804,840 1,042,938
Driver IC | China      
Segment, Product and Geographic Information      
Revenues 567,137 632,363 828,754
Driver IC | Taiwan      
Segment, Product and Geographic Information      
Revenues 116,145 119,289 149,037
Driver IC | Korea      
Segment, Product and Geographic Information      
Revenues 51,672 22,584 15,601
Driver IC | Japan      
Segment, Product and Geographic Information      
Revenues 16,372 27,763 48,921
Driver IC | America      
Segment, Product and Geographic Information      
Revenues   2,841 111
Driver IC | Others      
Segment, Product and Geographic Information      
Revenues     514
Non-driver products      
Segment, Product and Geographic Information      
Revenues 155,476 140,588 158,401
Non-driver products | China      
Segment, Product and Geographic Information      
Revenues 98,421 88,395 96,675
Non-driver products | Taiwan      
Segment, Product and Geographic Information      
Revenues 22,183 22,494 26,507
Non-driver products | Korea      
Segment, Product and Geographic Information      
Revenues 10,015 4,813 3,510
Non-driver products | Japan      
Segment, Product and Geographic Information      
Revenues 8,203 9,034 14,488
Non-driver products | America      
Segment, Product and Geographic Information      
Revenues 12,545 11,309 9,250
Non-driver products | Mexico      
Segment, Product and Geographic Information      
Revenues 2,807 627  
Non-driver products | Others      
Segment, Product and Geographic Information      
Revenues $ 1,302 $ 3,916 $ 7,971