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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements [Member] - USD ($)
Sep. 30, 2016
Dec. 31, 2015
Financial liabilities:    
Total financial liabilities $ 2,651,902 $ 11,104,993
Financial assets:    
Total financial assets   13,702,875
Money market funds [Member] | Cash equivalents [Member]    
Financial assets:    
Total financial assets   2,544,475
U.S. Treasury debt obligations [Member] | Cash equivalents [Member]    
Financial assets:    
Total financial assets   11,158,400
Note Payable [Member]    
Financial liabilities:    
Total financial liabilities 2,000,000  
Warrants [Member]    
Financial liabilities:    
Total financial liabilities 651,902 770,964
Loans Payable [Member]    
Financial liabilities:    
Total financial liabilities   10,334,029
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]    
Financial assets:    
Total financial assets   13,702,875
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member]    
Financial assets:    
Total financial assets   2,544,475
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | U.S. Treasury debt obligations [Member] | Cash equivalents [Member]    
Financial assets:    
Total financial assets   11,158,400
Significant Other Observable Inputs (Level 2) [Member]    
Financial liabilities:    
Total financial liabilities 2,651,902  
Significant Other Observable Inputs (Level 2) [Member] | Note Payable [Member]    
Financial liabilities:    
Total financial liabilities 2,000,000  
Significant Other Observable Inputs (Level 2) [Member] | Warrants [Member]    
Financial liabilities:    
Total financial liabilities $ 651,902  
Unobservable Inputs (Level 3) [Member]    
Financial liabilities:    
Total financial liabilities   11,104,993
Unobservable Inputs (Level 3) [Member] | Warrants [Member]    
Financial liabilities:    
Total financial liabilities   770,964
Unobservable Inputs (Level 3) [Member] | Loans Payable [Member]    
Financial liabilities:    
Total financial liabilities   $ 10,334,029