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Equity Method Investments (Details Textual) - USD ($)
$ in Thousands
 1 Months Ended 12 Months Ended
Dec. 31, 2017
Nov. 30, 2017
Apr. 30, 2017
Jan. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]              
Gain on disposal of equity method investment       $ 88 $ 0 $ 0 $ 88
Proceeds from Sale of Equity Method Investments       $ 179 0 0 179
Payments to Acquire Equity Method Investments         9,175 37 3,708
Viewsil Microelectronics Kunshan Limited [Member]              
Schedule of Equity Method Investments [Line Items]              
Equity In Losses Of Equity Method Investee         173 1,266 71
Investor Level Goodwill $ 1,897       1,897 $ 1,897 $ 1,897
Kneron Inc [Member]              
Schedule of Equity Method Investments [Line Items]              
Investee Level Intangible Asset 3,571       3,571    
Equity In Losses Of Equity Method Investee         252    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity   $ 3,636          
Finite-Lived Intangible Asset, Useful Life   7 years          
Payments to Acquire Equity Method Investments   $ 6,850          
Emza Visual Sense Ltd [Member]              
Schedule of Equity Method Investments [Line Items]              
Investee Level Intangible Asset 1,535       1,535    
Equity In Losses Of Equity Method Investee         $ 757    
Equity Method Investment, Difference Between Carrying Amount and Underlying Equity     $ 1,719        
Finite-Lived Intangible Asset, Useful Life     7 years        
Payments to Acquire Additional Investments Through Conversion of Original Debt     $ 270        
Payments to Acquire Equity Method Investments     $ 2,230        
Ganzin Technology Corp [Member]              
Schedule of Equity Method Investments [Line Items]              
Payments to Acquire Equity Method Investments $ 95