Annual report pursuant to Section 13 and 15(d)

Derivative Liability and Fair Value Measurements (Schedule of Fair Value Level 3 Warrant Liabilities) (Detail)

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Derivative Liability and Fair Value Measurements (Schedule of Fair Value Level 3 Warrant Liabilities) (Detail) - USD ($)
12 Months Ended
Jun. 03, 2014
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Convertible debt issued with an embedded conversion price adjustment provision $ 1,938,988    
Extinguishment of liability upon conversion of debt     $ (500,261)
Warrant Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value   $ 13,541,138 12,035,815
Reclassification of warrant exercises to Additional Paid-in Capital   (2,855,463) (2,127,405)
Change in fair value for the period of warrant derivative liability   1,098,465 825,786
Convertible debt issued with an embedded conversion price adjustment provision     1,938,988
Extinguishment of liability upon conversion of debt     (500,261)
Change in fair value of debt conversion price adjustment for the period     1,368,215
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   $ 240,786 $ 13,541,138