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Derivative liability - Black Scholes Valuations (Details)
12 Months Ended
Dec. 31, 2018
$ / shares
Derivative Liability Details  
Calculated stock price, min $ 0.024
Calculated stock price, max $ 0.10
Risk free interest rate, min 1.60%
Risk free interest rate, max 3.05%
Expected life of convertible notes and warrants, minimum 1 month
Expected life of convertible notes and warrants, maximum 5 years
Expected volatility of underlying stock, min 105.24%
Expected volatility of underlying stock, max 219.40%
Expected dividend rate 0.00%