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Revenues (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Revenues (Textual) [Abstract]        
Milestone revenue recognized     $ 100,000  
Acetadote, Generic        
Revenues (Textual) [Abstract]        
Share of product revenue from generic sales $ 1,200,000 $ 1,800,000 $ 2,400,000 $ 2,300,000