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Segment, Product and Geographic Information (Details 4) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Significant Customer [Line Items]
Revenue, Net	$ 685,167	$ 802,917	$ 691,789
Driver IC segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	250,454	265,442	243,409
Non-driver products segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	32,654	36,545	41,601
Customer A and its affiliates [Member] | Driver IC segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	147,961	152,142	116,456
Customer A and its affiliates [Member] | Non-driver products segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	28,767	27,873	22,345
Customer B and its affiliates [Member] | Driver IC segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	102,493	113,300	126,953
Customer B and its affiliates [Member] | Non-driver products segment [Member]
Segment Reporting Significant Customer [Line Items]
Revenue, Net	$ 3,887	$ 8,672	$ 19,256

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- References

No definition available.

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- Definition

Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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