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Equity Method Investments (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]    
Amount $ 2,362 $ 3,648
Viewsil Microelectronics Kunshan Limited [Member]    
Schedule of Equity Method Investments [Line Items]    
Amount $ 2,318 $ 3,629
Holding % 49.00% 49.00%
Iris Optronics Co., Ltd. [Member]    
Schedule of Equity Method Investments [Line Items]    
Amount $ 44 $ 19
Holding % 2.06% 1.98%