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Fair Value Measurements (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments in Non-marketable Equity Securities	$ 12,242	$ 11,211
Impairment loss on investment	$ 0	$ 0	$ 309
Oculon Optoelectronics Inc [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments in Non-marketable Equity Securities			0
Impairment loss on investment			309
Fair Value, Inputs, Level 1 [Member] | Oculon Optoelectronics Inc [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments in Non-marketable Equity Securities			0
Fair Value, Inputs, Level 2 [Member] | Oculon Optoelectronics Inc [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments in Non-marketable Equity Securities			0
Fair Value, Inputs, Level 3 [Member] | Oculon Optoelectronics Inc [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Investments in Non-marketable Equity Securities			$ 0

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=6872867&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=29638308&loc=d3e40346-111594

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- Definition

The amount by which the fair value of an investment is less than the amortized cost basis or carrying amount of that investment at the balance sheet date and the decline in fair value is deemed to be other than temporary, before considering whether or not such amount is recognized in earnings or other comprehensive income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 35
-Paragraph 34
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