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Fair Value Measurement - Financial Assets and Liabilities Measured at Fair Value (Detail) - Fair Value, Measurements [Member]
Dec. 31, 2015
USD ($)
Financial assets:  
Total financial assets $ 13,702,875
Financial liabilities:  
Total financial liabilities 11,104,993
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
Loan Payable [Member]  
Financial liabilities:  
Total financial liabilities 10,334,029
Warrants [Member]  
Financial liabilities:  
Total financial liabilities 770,964
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
Unobservable Inputs (Level 3) [Member]  
Financial liabilities:  
Total financial liabilities 11,104,993
Unobservable Inputs (Level 3) [Member] | Loan Payable [Member]  
Financial liabilities:  
Total financial liabilities 10,334,029
Unobservable Inputs (Level 3) [Member] | Warrants [Member]  
Financial liabilities:  
Total financial liabilities $ 770,964