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Stockholders' Equity - Restricted Stock Units (Revest shares), Narrative (Details)
12 Months Ended
Jan. 31, 2022
USD ($)
Dec. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
$ / shares
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2020
cofounder
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 136,303,000 $ 145,796,000 $ 140,488,000  
Signal Sciences Corp          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares restricted for stock awards (in shares) | shares         896,499
Number of cofounders with shares subject to revesting | cofounder         3
Shares held back for restricted stock awards, revesting period         2 years
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Granted (in dollars per share) | $ / shares   $ 15.80 $ 14.63 $ 54.92  
Vested in period, grant date fair value   $ 127,300,000 $ 97,900,000 $ 67,700,000  
Stock-based compensation expense   105,200,000 98,500,000 $ 78,300,000  
Unrecognized stock-based compensation cost   $ 177,100,000      
Weighted-average period of recognition   2 years 4 months 24 days      
RSUs | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
RSUs | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
RSUs | First Year | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   3 years      
Award vesting percentage per year   25.00%      
RSUs | First Year | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   4 years      
Award vesting percentage per year   33.00%      
RSUs | Remaining Period | Minimum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   24 months      
RSUs | Remaining Period | Maximum          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period   36 months      
RSAs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 0 27,600,000    
Unrecognized stock-based compensation cost   0      
Nonvested shares sold that remain unvested (in shares) | shares       224,124  
Proceeds from nonvested shares sold $ 10,700,000        
Incremental cost due to plan modification   $ 0 $ 5,600,000