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Fair Value Measurements (Details 1) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items] |  |  |
Investments in Non-marketable Equity Securities | $ 11,211 | $ 11,211 |
Impairment loss on investment | $ 0 | 309 | $ 0
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 |

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- 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 + Details
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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=56944662&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 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e25351-111560 + Details
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