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Government Grants (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Government Grants [Line Items]      
Government Grants Recognized By Reduction Of Research and Development Expenses General and Administrative Expenses $ 1,508 $ 1,879 $ 2,011