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Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) (USD $)
Sep. 30, 2014
Dec. 31, 2013
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Insurance recoverable $ 3,500,000  
Prepaid research fees 514,923 1,334,149
Prepaid marketing fees 134,091  
Prepaid insurance 71,916 219,651
Prepaid subscription fees 32,452 24,643
Prepaid offering costs 18,160  
Prepaid rent 770 7,848
Other 45,046 23,151
Total prepaid expenses and other current assets $ 4,317,358 $ 1,609,442