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Business Combinations - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Oct. 01, 2020
USD ($)
cofounder
$ / shares
shares
Sep. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
May 31, 2019
$ / shares
Business Acquisition [Line Items]                
Revenue   $ 86,735   $ 70,638 $ 256,613 $ 208,225    
Net loss   $ 56,198   $ 23,778 $ 165,176 $ 50,228    
Common Class A                
Business Acquisition [Line Items]                
Common stock, par value (in USD per share) | $ / shares               $ 0.00002
Signal Sciences Corp.                
Business Acquisition [Line Items]                
Business acquisition, percentage of voting interests acquired 100.00%              
Aggregate consideration transferred $ 759,400              
Cash consideration transferred 223,000              
Acquisition, value of equity consideration $ 536,400              
Number of cofounders with shares subject to revesting | cofounder 3              
Shares held back for restricted stock awards, revesting period 2 years              
Unvested stock option assumed, fair value $ 21,800              
Amount allocated to purchase price 1,100              
Amount allocated to future services $ 20,700              
Amount allocated to future services, recognition period 2 years 6 months              
Unvested stock options assumed, conversion ratio 10.00%              
Estimated useful life (in years) 6 years 7 months 6 days              
Tax benefit from release of valuation allowance             $ 13,000  
Acquisition related costs             $ 20,800  
Revenue     $ 6,700          
Net loss     $ 23,000          
Signal Sciences Corp. | Common Class A                
Business Acquisition [Line Items]                
Shares issued related to a business combination (in shares) | shares 6,367,709              
Number of shares issued in acquisition (in shares) | shares 5,471,210              
Number of shares restricted for stock awards (in shares) | shares 896,499              
Common stock, par value (in USD per share) | $ / shares $ 0.00002              
Unvested stock options assumed (in shares) | shares 251,754