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Summary of Significant Accounting Policies - Summary of Fair Value Measurement Financial Asset and Liabilities (Detail) (USD $)
Dec. 31, 2013
Dec. 31, 2012
Assets:    
Cash and cash equivalents $ 90,434,435 $ 18,695,197
Money market funds 26,046,974 29,047,958
Restricted cash 404,850 404,850
Total Assets 116,886,259 48,148,005
Liabilities:    
Preferred stock warrant liability   (52,947)
Quoted Prices in Active Markets for Identical Assets Level 1 [Member]
    
Assets:    
Cash and cash equivalents 90,434,435 18,695,197
Money market funds 26,046,974 29,047,958
Restricted cash 404,850 404,850
Total Assets 116,886,259 48,148,005
Liabilities:    
Preferred stock warrant liability     
Significant Other Observable Inputs Level 2 [Member]
    
Assets:    
Cash and cash equivalents      
Money market funds      
Restricted cash      
Total Assets      
Liabilities:    
Preferred stock warrant liability     
Significant Unobservable Inputs Level 3 [Member]
    
Assets:    
Cash and cash equivalents      
Money market funds      
Restricted cash      
Total Assets      
Liabilities:    
Preferred stock warrant liability   $ (52,947)