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Revenues (Details Textual) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 1.8 $ 1.8 $ 2.3 $ 3.2