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Revenues (Details Textual) (USD $)
In Millions, unless otherwise specified
 9 Months Ended 3 Months Ended 9 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2014
product_line
Sep. 30, 2014
Acetadote, Generic
Sep. 30, 2013
Acetadote, Generic
Sep. 30, 2014
Acetadote, Generic
Sep. 30, 2013
Acetadote, Generic
Jun. 30, 2013
Non-collaborative Arrangement, 2013 Commercialization Agreement with Three International Partners
agreement
Dec. 31, 2013
Non-collaborative Arrangement, 2013 Commercialization Agreement with Three International Partners
agreement
Dec. 31, 2013
Maximum
Receipt of regulatory notice on approval
Dec. 31, 2013
Maximum
Payments based on total and annual product sales
Revenues (Textual) [Abstract]                  
Number of product lines acquired 2                
Share of product revenue from generic sales   $ 1.4 $ 1.9 $ 4.6 $ 7.0        
Number of agreements with international partners for commercialization in international markets           5 6    
Number of agreements amended with international partners for commercialization in international markets             1    
Revenue recognized from license agreement           0.6      
Other revenues, milestone method, future revenue upon achieving milestones               $ 0.6 $ 4.0