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Segment, Product and Geographic Information - Segment revenues from major product lines (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
Display drivers for large-sized applications      
Segment, Product and Geographic Information      
Revenues 125,936 175,666 263,992
Display drivers for small and medium-sized applications      
Segment, Product and Geographic Information      
Revenues 625,390 629,174 778,946
Non-driver products      
Segment, Product and Geographic Information      
Revenues 155,476 140,588 158,401
Driver IC      
Segment, Product and Geographic Information      
Revenues 751,326 804,840 1,042,938
Driver IC | Display drivers for large-sized applications      
Segment, Product and Geographic Information      
Revenues 125,936 175,666 263,992
Driver IC | Display drivers for small and medium-sized applications      
Segment, Product and Geographic Information      
Revenues 625,390 629,174 778,946
Driver IC | Non-driver products      
Segment, Product and Geographic Information      
Revenues 0 0 0
Non-driver products      
Segment, Product and Geographic Information      
Revenues 155,476 140,588 158,401
Non-driver products | Display drivers for large-sized applications      
Segment, Product and Geographic Information      
Revenues 0 0 0
Non-driver products | Display drivers for small and medium-sized applications      
Segment, Product and Geographic Information      
Revenues 0 0 0
Non-driver products | Non-driver products      
Segment, Product and Geographic Information      
Revenues $ 155,476 $ 140,588 $ 158,401