XML 61 R49.htm IDEA: XBRL DOCUMENT v3.22.2
Stockholders' Equity (Schedule of Fair Value of Employee Stock Options) (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Risk-free interest rate, minimum       1.76%
Options to purchase common stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years 4 years 7 months 6 days 4 years 7 months 6 days 4 years 7 months 6 days 4 years 7 months 6 days
Expected volatility 72.00% 70.00%    
Risk-free interest rate 2.77% 0.74%    
Risk-free interest rate, minimum       0.50%
Risk-free interest rate, maximum     2.77% 0.74%
Weighted average grant date fair value per share $ 3.26 $ 14.54 $ 6.05 $ 18.86
Options to purchase common stock [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected volatility     70.00% 68.00%
Options to purchase common stock [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected volatility     72.00% 70.00%