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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, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of operating segments [line items] |  |  |
Revenue | $ 887,282 | $ 671,835 | $ 723,605
China [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 707,002 | 472,372 | 480,392
Taiwan [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 123,180 | 129,257 | 168,122
Other Asia Pacific (Philippines, Korea and Japan) |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 56,195 | 68,779 | 72,294
Europe and America [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 905 | 1,427 | 2,797
Driver IC [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 756,522 | 544,727 | 586,258
Driver IC [Member] | China [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 643,527 | 421,729 | 419,249
Driver IC [Member] | Taiwan [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 88,001 | 90,971 | 136,526
Driver IC [Member] | Other Asia Pacific (Philippines, Korea and Japan) |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 24,964 | 31,861 | 30,483
Driver IC [Member] | Europe and America [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 30 | 166 | 0
Non-driver products [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 130,760 | 127,108 | 137,347
Non-driver products [Member] | China [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 63,475 | 50,643 | 61,143
Non-driver products [Member] | Taiwan [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 35,179 | 38,286 | 31,596
Non-driver products [Member] | Other Asia Pacific (Philippines, Korea and Japan) |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | 31,231 | 36,918 | 41,811
Non-driver products [Member] | Europe and America [Member] |  |  |
Disclosure of operating segments [line items] |  |  |
Revenue | $ 875 | $ 1,261 | $ 2,797

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