XML 54 R44.htm IDEA: XBRL DOCUMENT v3.23.1
STOCK INCENTIVE PLANS - Stock Option Narratives (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award      
Intrinsic value of options exercised $ 0.4 $ 5.2  
Intrinsic value of options outstanding 41.3   $ 46.0
Proceeds from issuance of common stock on exercise of stock options 0.1 $ 0.3  
Stock options      
Share-based Compensation Arrangement by Share-based Payment Award      
Share-based compensation expense not yet recognized $ 7.2   $ 8.1
Share-based compensation not yet recognized, recognition period (in years) 1 year 1 month 2 days   1 year 2 months 15 days
Stock options | Common stock      
Share-based Compensation Arrangement by Share-based Payment Award      
Granted (in shares) 0 0  
Stock options | The 2019 Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 4 years    
Stock options | The 2009 Option Plan      
Share-based Compensation Arrangement by Share-based Payment Award      
Vesting period (in years) 4 years    
Stock options | Ten Percent Holder | Minimum      
Share-based Compensation Arrangement by Share-based Payment Award      
Purchase price as a percentage of common stock (as a percent) 110.00%    
Stock options | Other Than Ten Percent Holder      
Share-based Compensation Arrangement by Share-based Payment Award      
Purchase price as a percentage of common stock (as a percent) 100.00%    
Stock options | Chief Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares subject to repurchase related to stock options early exercised and not yet vested (in shares) 697,275   813,311
Non Statutory Options      
Share-based Compensation Arrangement by Share-based Payment Award      
Purchase price as a percentage of common stock (as a percent) 100.00%    
Weighted average stock options | Chief Executive Officer      
Share-based Compensation Arrangement by Share-based Payment Award      
Shares subject to repurchase related to stock options early exercised and not yet vested $ 1.1   $ 1.3