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Equity Method Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Amount	$ 10,739	$ 2,362
Viewsil Microelectronics (Kunshan) Limited
Schedule of Equity Method Investments [Line Items]
Amount	$ 2,214	$ 2,318
Holding %	49.00%	49.00%
Iris Optronics Co., Ltd.
Schedule of Equity Method Investments [Line Items]
Amount	$ 30	$ 44
Holding %	2.06%	2.06%
Kneron Inc.
Schedule of Equity Method Investments [Line Items]
Amount	$ 6,598	$ 0
Holding %	27.65%	0.00%
Emza Visual Sense Ltd.
Schedule of Equity Method Investments [Line Items]
Amount	$ 1,802	$ 0
Holding %	45.10%	0.00%
Ganzin Technology Corp.
Schedule of Equity Method Investments [Line Items]
Amount	$ 95	$ 0
Holding %	28.93%	0.00%

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571

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- Definition

This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 323
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=66022249&loc=d3e33749-111570

Reference 2: 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

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- Definition

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+ References

No definition available.

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