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Notes Payable - Warrants Calculated Using the Black Scholes Merton Pricing Model (Detail)
Dec. 31, 2018
$ / shares
Mar. 23, 2017
$ / shares
shares
Warrants calculated using the Black Scholes Merton pricing model    
Number of warrants | shares   500,000
Exercise price   $ 2.26
Weighted-average fair value of warrants $ 3.11 $ 0.73
Expiration date   Nov. 13, 2022
Expected Volatility of Underlying Stock    
Warrants calculated using the Black Scholes Merton pricing model    
Warrants outstanding, measurement input 0.74 0.72
Risk-Free Interest Rate    
Warrants calculated using the Black Scholes Merton pricing model    
Warrants outstanding, measurement input 0.0162 0.0208
Dividend Yield    
Warrants calculated using the Black Scholes Merton pricing model    
Warrants outstanding, measurement input 0.00 0.00
Expected Life of Warrants    
Warrants calculated using the Black Scholes Merton pricing model    
Expected life of warrants 8 years 5 years