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Stock-based Compensation - Additional Infomation (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jun. 30, 2021
Jun. 16, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock, shares, issued 239,789,000 239,789,000   239,789,000   15,570,000    
Weighted average grant date fair value       $ 6.55 $ 3.21      
Share Based Compensation Expense   $ 13,042 $ 9,748 $ 41,023 $ 20,290      
Total stock-based compensation cost related to unvested awards not yet recognized $ 122,500 $ 122,500   $ 122,500        
Expected weighted-average period compensation cost to be recognized       2 years 5 months 15 days        
IPO [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Share-based Payment Arrangement, Accelerated Cost       $ 2,600        
2021 Plan                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Vesting period       4 years        
Common shares reserved for future issuance 24,900,000 24,900,000   24,900,000       26,662,087
Percentage of Common shares reserved for future issuance increase       5.00%        
2021 Plan | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Option expiration period       10 years        
2021 ESPP                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Common stock, shares, issued 0 0   0        
Common shares reserved for future issuance             2,470,000  
Percentage of Common shares reserved for future issuance increase           1.00%    
Share-based compensation arrangement by share-based payment award, other share increase (decrease)       4,940,000        
Percentage of Purchase of shares at fair value 85.00%              
2021 ESPP | Maximum [Member]                
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]                
Maximum offering period 27 months              
Purchase of common stock at discount 15.00% 15.00%   15.00%