Quarterly report pursuant to Section 13 or 15(d)

Stockholders' Equity (Details 2)

v3.19.2
Stockholders' Equity (Details 2) - $ / shares
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Fair value of common stock $ 2.32  
Expected volatility 151.76%  
Dividend yield 0.00% 0.00%
Risk-free interest 2.70%  
Expected life (years) 5 years 6 months 5 years 3 months 29 days
Minimum [Member]    
Fair value of common stock   $ 10.92
Expected volatility   118.10%
Risk-free interest   2.87%
Maximum [Member]    
Fair value of common stock   $ 13.26
Expected volatility   118.83%
Risk-free interest   3.00%