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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

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