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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements [Member]
Sep. 30, 2015
USD ($)
Financial assets:  
Total financial assets $ 20,678,578
Financial liabilities:  
Total financial liabilities 11,986,017
Money market funds [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 21,744
U.S. Treasury debt obligations [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 20,656,834
Loan Payable [Member]  
Financial liabilities:  
Total financial liabilities 11,370,092
Warrants [Member]  
Financial liabilities:  
Total financial liabilities 615,925
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]  
Financial assets:  
Total financial assets 20,678,578
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money market funds [Member] | Cash equivalents [Member]  
Financial assets:  
Total financial assets 21,744
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 20,656,834
Unobservable Inputs (Level 3) [Member]  
Financial liabilities:  
Total financial liabilities 11,986,017
Unobservable Inputs (Level 3) [Member] | Loan Payable [Member]  
Financial liabilities:  
Total financial liabilities 11,370,092
Unobservable Inputs (Level 3) [Member] | Warrants [Member]  
Financial liabilities:  
Total financial liabilities $ 615,925