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) - Warrant Liabilities [Member] - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair value $ 173,131 $ 240,786 $ 13,541,138
Reclassification of warrant exercises to Additional Paid-in Capital 0 (32,911) (2,855,463)
Change in fair value for the period of warrant derivative liability (20,204) (34,744) 1,098,465
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 $ 152,927 $ 173,131 $ 240,786