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Revenues (Schedule of Net Product Revenues by Product) (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Revenue from External Customer [Line Items]      
Net product revenue $ 47,944,031 $ 50,893,794 $ 44,704,570
Product, Acetadote
      
Revenue from External Customer [Line Items]      
Net product revenue 37,522,180 42,454,055 35,092,796
Product, Kristalose
      
Revenue from External Customer [Line Items]      
Net product revenue 9,429,741 8,517,873 9,510,275
Product, Caldolor
      
Revenue from External Customer [Line Items]      
Net product revenue $ 992,110 $ (78,134) $ 101,499