Quarterly report pursuant to Section 13 or 15(d)

Equity - Summary of Assumptions Used (Details)

v3.19.1
Equity - Summary of Assumptions Used (Details)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Class of Stock    
Expected dividend yield (percent) 0.00% 0.00%
Employee Stock Option    
Class of Stock    
Risk free interest rate, minimum (percent) 0.95% 1.30%
Risk free interest rate, maximum (percent) 2.24% 2.24%
Volatility, minimum (percent) 70.18% 70.18%
Volatility, maximum (percent) 89.11% 89.11%
Employee Stock Option | Minimum    
Class of Stock    
Expected life (years) 5 years 5 years
Employee Stock Option | Maximum    
Class of Stock    
Expected life (years) 6 years 3 months 6 years 3 months