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Stockholders' Equity - RSUs and Revest Shares (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Oct. 01, 2020
cofounder
shares
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 36,636 $ 12,142 $ 100,900 $ 34,752
Modification expense   2,400 400 $ 3,700 400
Signal Sciences Corp.          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of cofounders with shares subject to revesting | cofounder 3        
Shares held back for restricted stock awards, revesting period 2 years        
Signal Sciences Corp. | Common Class A          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares restricted for stock awards (in shares) | shares 896,499        
RSUs          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       4 years  
Stock-based compensation expense   23,000 $ 10,600 $ 52,000 28,000
Modification expense   3,900   3,900 $ 4,800
Unrecognized stock-based compensation cost   176,600   $ 176,600  
Weighted-average period of recognition       2 years 8 months 12 days  
RSUs | First Year          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       4 years  
Award vesting percentage       25.00%  
RSUs | Remaining Period          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Award vesting period       36 months  
Revest Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   11,000   $ 32,900  
Unrecognized stock-based compensation cost   $ 43,900   $ 43,900  
Weighted-average period of recognition       1 year