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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