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Derivative Financial Instruments - Changes in Fair Values of Derivative Liabilities (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Derivative [Line Items]      
Total derivative income (expense) $ 3,402,416 $ (1,175,971) $ 1,001,679
2014 Convertible Promissory Notes [Member]      
Derivative [Line Items]      
Derivative income (expense) 3,944,763 (1,280,873)  
Warrant Derivatives [Member]      
Derivative [Line Items]      
Derivative income (expense) $ (542,347) $ 104,902