Quarterly report pursuant to Section 13 or 15(d)

Derivative Liability and Fair Value Measurements (Estimate the fair value of warrants outstanding) (Detail)

v3.8.0.1
Derivative Liability and Fair Value Measurements (Estimate the fair value of warrants outstanding) (Detail) - Monte Carlo Options Lattice Pricing Model Warrants Outstanding - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Assumptions for Pricing Model:    
Expected term in years 4 months 6 days 7 months 2 days
Volatility range for years 145.00% 143.00%
Risk-free interest rate 2.09% 1.76%
Expected annual dividends 0.00% 0.00%
Value of warrants outstanding:    
Fair value of warrants $ 124,794 $ 152,927