Segment, Product and Geographic Information (Details 4) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017
Disclosure of operating segments [line items]
Revenue	$ 723,605	$ 685,167
Driver IC Segment [Member]
Disclosure of operating segments [line items]
Revenue	266,834	250,454
Driver IC Segment [Member] \| Customer A and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	178,907	147,961
Driver IC Segment [Member] \| Customer B and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	87,927	102,493
Non-driver Products Segment [Member]
Disclosure of operating segments [line items]
Revenue	27,005	32,654
Non-driver Products Segment [Member] \| Customer A and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	24,088	28,767
Non-driver Products Segment [Member] \| Customer B and Its Affiliates [Member]
Disclosure of operating segments [line items]
Revenue	$ 2,917	$ 3,887

The income arising in the course of an entity's ordinary activities. Income is increases in economic benefits during the accounting period in the form of inflows or enhancements of assets or decreases of liabilities that result in an increase in equity, other than those relating to contributions from equity participants.

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+ Details