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Property and Equipment - Schedule of Property and Equipment (Detail) (USD $)
Sep. 30, 2013
Dec. 31, 2012
Dec. 31, 2011
Property, Plant and Equipment [Line Items]      
Property and equipment $ 19,643,994 $ 17,607,293 $ 16,667,250
Less accumulated depreciation and amortization (15,174,112) (14,339,497) (13,379,567)
Property and equipment, net 4,469,882 3,267,796 3,287,683
Computer Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment 2,172,535 2,003,706 1,951,246
Software [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment 1,323,081 1,323,081 1,323,081
Furniture [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment 599,650 599,650 599,650
Lab Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment 10,603,598 8,747,790 7,910,207
Office Equipment [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment 51,360 51,360 51,360
Leasehold Improvements [Member]
      
Property, Plant and Equipment [Line Items]      
Property and equipment $ 4,893,770 $ 4,881,706 $ 4,831,706