v3.24.3
Equity-Based Compensation - Narrative (Details)
$ / shares in Units, $ in Millions
 1 Months Ended 3 Months Ended 30 Months Ended
Sep. 30, 2019
period
Aug. 31, 2019
Sep. 30, 2024
USD ($)
$ / shares
shares
Sep. 30, 2023
USD ($)
period
$ / shares
Aug. 31, 2023
$ / shares
shares
Oct. 31, 2023
shares
Jul. 01, 2023
shares
Class of Stock [Line Items]              
Aggregate intrinsic value     $ 0.6 $ 5.0      
Weighted-average grant date fair value per option (in dollars per share) | $ / shares     $ 2.86 $ 0      
Stock-based compensation expense     $ 47.2 $ 74.2      
Number of employees eligible, terminated their employment | period       1      
Stock-based compensation expense       $ 5.4      
2019 Equity Incentive Plan              
Class of Stock [Line Items]              
Vesting period (in months)   4 years          
Expiration period (in years)   10 years          
Severance Plan | Minimum              
Class of Stock [Line Items]              
Post-termination period during which an employee may exercise outstanding stock options extended term       90 days      
Severance Plan | Maximum              
Class of Stock [Line Items]              
Post-termination period during which an employee may exercise outstanding stock options extended term       3 years      
ESPP              
Class of Stock [Line Items]              
Expected dividend yield     0.00% 0.00%      
Stock-based compensation expense     $ 1.6 $ 1.1      
Unrecognized stock-based compensation expense     $ 7.0        
Unrecognized stock-based compensation expense, period for recognition (in years)     1 year 9 months 18 days        
ESPP | 2019 Employee Stock Purchase Plan              
Class of Stock [Line Items]              
Number of purchase periods | period 4            
Purchase period (in months) 6 months            
Commencement of offering period (in years) 2 years            
Commencement of purchase period (in months) 6 months            
Employee Stock Options              
Class of Stock [Line Items]              
Expected dividend yield     0.00%        
Unrecognized stock-based compensation expense     $ 433.7        
Unrecognized stock-based compensation expense, period for recognition (in years)     2 years 4 months 24 days        
Class A Common Stock | 2019 Equity Incentive Plan              
Class of Stock [Line Items]              
Increase in number of shares authorized, as a percentage of total common stock outstanding 5.00%            
Increase in number of shares available for future issuance (in shares) | shares           36,000,000 18,813,085
Number of shares available for future issuance (in shares) | shares     60,724,755        
Class A Common Stock | ESPP              
Class of Stock [Line Items]              
Number of shares purchased under ESPP (in shares) | shares         375,829    
Weighted-average price of shares purchased under ESPP (in dollars per share) | $ / shares         $ 3.91    
Class A Common Stock | ESPP | 2019 Employee Stock Purchase Plan              
Class of Stock [Line Items]              
Increase in number of shares authorized, as a percentage of total common stock outstanding 1.00%            
Increase in number of shares available for future issuance (in shares) | shares             3,762,617
Number of shares available for future issuance (in shares) | shares     18,632,205        
Purchase price of common stock, percentage of fair market value 85.00%