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Revenues (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Revenues (Textual) [Abstract]        
Non-refundable up-front payments     $ 1.4  
Upfront payments and milestones payments related to regulatory approvals     1.7  
Upfront payments and milestone payments related to product sales     4.0  
Acetadote, Generic        
Revenues (Textual) [Abstract]        
Share of product revenue from generic sales $ 1.1 $ 1.4 $ 3.3 $ 4.6