Quarterly report pursuant to Section 13 or 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)
9 Months Ended
Sep. 30, 2018
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]  
Fair value - December 31, 2017 $ 152,927
Reclassification of warrant exercises and warrant expirations to Additional Paid-in Capital (166,800)
Change in fair value for the period of warrant derivative liability 13,873
Fair value - September 30, 2018 $ 0