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Segment, Product and Geographic Information - Revenues from significant customers (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of operating segments [line items]
Revenue	$ 671,835	$ 723,605	$ 685,167
Driver IC Segment [Member]
Disclosure of operating segments [line items]
Revenue	238,702	266,834	250,454
Driver IC Segment [Member] | Customer A and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	182,442	178,907	147,961
Driver IC Segment [Member] | Customer B and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	56,260	87,927	102,493
Non-driver Products Segment [Member]
Disclosure of operating segments [line items]
Revenue	19,509	27,005	32,654
Non-driver Products Segment [Member] | Customer A and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	15,988	24,088	28,767
Non-driver Products Segment [Member] | Customer B and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	$ 3,521	$ 2,917	$ 3,887

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