Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Assumptions Used (Details)

v3.19.3
Equity - Summary of Assumptions Used (Details) - Stock options
9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Class of Stock    
Risk free interest rate, minimum (percent) 1.04% 0.95%
Risk free interest rate, maximum (percent) 1.30% 2.24%
Volatility, minimum (percent) 85.00% 70.00%
Volatility, maximum (percent) 100.00% 89.00%
Expected dividend yield (percent) 0.00% 0.00%
Minimum    
Class of Stock    
Expected life (years) 5 years 3 months 21 days 5 years
Maximum    
Class of Stock    
Expected life (years) 6 years 3 months 6 years 3 months