XML 79 R65.htm IDEA: XBRL DOCUMENT v3.22.0.1
Stockholders' Equity (Schedule of Fair Value of Employee Stock Options) (Details) - $ / shares
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Weighted average grant date fair value per share $ 18.36 $ 4.14    
Options to purchase common stock [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years   5 years   0 years
Expected volatility   70.70%    
Risk-free interest rate   0.30%    
Weighted average grant date fair value per share $ 15.53 $ 7.20  
Options to purchase common stock [Member] | Minimum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years 2 years 1 month 6 days      
Expected volatility 67.00%      
Risk-free interest rate 0.05%      
Options to purchase common stock [Member] | Maximum [Member]        
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]        
Expected term in years 4 years 7 months 6 days      
Expected volatility 80.00%      
Risk-free interest rate 1.10%