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Investments in Non-Marketable Equity Securities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | $ 12,242 | $ 11,211
Chi Lin Optoelectronics Co Ltd [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 488 | 625
Chi Lin Technology Co Ltd [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 432 | 432
Jetronics International Corp [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 0 | 432
C Company [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 8,962 | 8,962
TIEF Fund, L. P. [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 1,600 | 0
eTurboTouch Technology Inc [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 477 | 477
Oculon Optoelectronics Inc [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | 0 | 0
Shinyoptics Corp [Member] |  |
Security Owned Not Readily Marketable [Line Items] |  |
Cost Method Investments | $ 283 | $ 283

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