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Buyout of License (Details Textual)
$ in Thousands, € in Millions
1 Months Ended 12 Months Ended
Dec. 31, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Proceeds from Sale of Intangible Assets $ 5,700 € 5.4      
Gain (Loss) on Disposition of Intangible Assets $ 4,700   $ 4,652 $ 0 $ 0