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Fair Value of Financial Instruments - Warrant Liability Measured at Fair Value on a Recurring Basis (Detail) - Recurring [Member] - Tradable Warrants [Member]
Sep. 30, 2016
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liability $ 3,342,340
Level 3 [Member]  
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Warrant liability $ 3,342,340