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Stock-based Compensation - Schedule of Assumptions Using Black-Scholes Option Pricing Model (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Risk free interest rate 2.554%  
Risk free interest rate, minimum   2.302%
Risk free interest rate, maximum   2.659%
Expected life (in years) 6 years 2 months 27 days  
Expected Volatility 169.87%  
Expected Volatility, minimum   169.33%
Expected Volatility, maximum   179.79%
Expected dividend yield 0.00% 0.00%
Minimum [Member]    
Expected life (in years)   6 years 2 months 27 days
Maximum [Member]    
Expected life (in years)   7 years 9 months