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Investments in Non-Marketable Equity Securities (Details Textual) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Jun. 30, 2016 | May 31, 2015 | Oct. 31, 2014 | May 31, 2014 | Mar. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Impairment loss on investment |  |  |  |  |  |  | $ 0 | $ 0 | $ 309
Gains (losses) on sale of securities, net |  |  |  |  |  |  | $ 10 | 1,993 | 10,471
L Company [Member] |  |  |  |  |  |  |  |  |
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  |  | $ 1,682 |  | $ 14,743 |  |  |  |
Gains (losses) on sale of securities, net |  |  |  |  |  |  |  | $ 1,682 | 10,743
Total Proceeds From Sale, Maturity and Collection Of Investments |  |  |  |  | $ 16,425 |  |  |  |
S Company [Member] |  |  |  |  |  |  |  |  |
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Proceeds from Sale, Maturity and Collection of Investments |  |  |  |  |  | $ 4,948 |  |  |
Gains (losses) on sale of securities, net |  |  |  |  |  |  |  |  | 241
Chi Lin Optoelectronics Co Ltd [Member] |  |  |  |  |  |  |  |  |
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Proceeds From Capital Reduction Of Investments | $ 137 |  |  |  |  |  |  |  |
Jetronics International Corp [Member] |  |  |  |  |  |  |  |  |
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Proceeds From Capital Reduction Of Investments |  | $ 431 |  | $ 1,168 |  |  |  |  |
Oculon Optoelectronics Inc [Member] |  |  |  |  |  |  |  |  |
Security Owned Not Readily Marketable [Line Items] |  |  |  |  |  |  |  |  |
Impairment loss on investment |  |  |  |  |  |  |  |  | $ 309

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