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Segment, Product and Geographic Information - Revenues from significant customers (Details) - USD ($) $ in Thousands | 12 Months Ended
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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

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