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Derivative Financial Instruments - Changes in Fair Value Inputs and Assumptions Related to Derivative Warrants (Detail) - Warrant Derivatives [Member] - USD ($)
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]    
Balances at January 1 $ 6,225 $ 111,127
Changes in fair value inputs and assumptions reflected in income (6,083) (95,128)
Balances at September 30 $ 142 $ 15,999