XML 56 R45.htm IDEA: XBRL DOCUMENT v3.21.1
Equity - Schedule of Assumptions Used to Determine Fair Value of and Stock Options Granted (Details) - Stock Options - $ / shares
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected volatility, minimum 77.40% 70.30%
Expected volatility, maximum 78.00% 71.40%
Risk free interest rate, minimum 0.50% 0.80%
Risk free interest rate, maximum 1.10% 1.60%
Expected dividend yield 0.00% 0.00%
Minimum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term (years) 5 years 7 months 6 days 5 years 7 months 6 days
Exercise price $ 77.51 $ 41.62
Maximum    
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]    
Expected term (years) 7 years 7 years
Exercise price $ 82.21 $ 49.97