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Investments in Non-Marketable Equity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	$ 3,122	$ 12,242
Chi Lin Optoelectronics Co Ltd [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	356	488
Chi Lin Technology Co Ltd [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	406	432
C Company [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	0	8,962
TIEF Fund, L. P. [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	1,600	1,600
eTurboTouch Technology Inc [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	477	477
Shinyoptics Corp [Member]
Security Owned Not Readily Marketable [Line Items]
Cost Method Investments	$ 283	$ 283

X

- Definition

Amount, after adjustment, of cost-method investment. Adjustments include, but are not limited to, dividends received in excess of earnings after date of investment that are considered a return of investment and other than temporary impairments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.12)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=75025870&loc=d3e40691-111596

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 325
-SubTopic 20
-Section 35
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75027002&loc=d3e40346-111594

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+ References

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