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Derivative Liability and Fair Value Measurements (Schedule of Fair Value Level 3 Warrant Liabilities) (Detail) - Warrant Liabilities [Member]
 9 Months Ended
Sep. 30, 2015
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value - December 31, 2014 $ 13,541,138
Reclassification of warrant exercises to Additional Paid-in Capital (2,855,463)
Change in fair value for the period of warrant derivative liability 968,467
Reclassification of embedded debt conversion price adjustment provision liability to Additional Paid-in Capital upon waiver of certain anti-dilutive provisions (2,806,942)
Reclassification of warrant exercise price adjustment provision liability to Additional Paid-in Capital upon waiver of certain anti-dilutive provisions (8,736,412)
Fair value - September 30, 2015 $ 110,788