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Stock-based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2021
Dec. 31, 2019
Nov. 30, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Jun. 30, 2021
Jun. 16, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total stock-based compensation expense       $ 62,201 $ 33,261 $ 15,732      
Weighted average grant date fair value (in dollars per share)       $ 6.59 $ 3.36 $ 2.24      
Total stock-based compensation cost related to unvested awards not yet recognized $ 136,800     $ 136,800          
Expected weighted-average period compensation cost to be recognized       2 years 3 months 29 days          
Intrinsic value of options exercised       $ 16,100 $ 300 $ 0      
IPO                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Total stock-based compensation expense       2,600          
Stock option                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Incremental stock-based compensation expense of modifications       3,300          
Incremental stock-based compensation expense of modifications recognized during period       300 700 600      
Weighted average grant date fair value (in dollars per share)   $ 3.65 $ 4.78            
RSAs                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Incremental stock-based compensation expense of modifications           8,600      
Fair value of awards vested during period       $ 57,100 $ 29,400 $ 33,500      
2021 Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares reserved for future issuance (in shares)                 26,662,087
Period of increase in term of awards       10 years          
Proportion of stock outstanding (as a percent)       5.00%          
Vesting period       4 years          
Future issuance of common shares (in shares) 24,700,000     24,700,000          
2021 Plan | Maximum                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award expiration period       10 years          
2021 ESPP                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Common shares reserved for future issuance (in shares)               2,470,000  
Period of increase in term of awards             10 years    
Proportion of stock outstanding (as a percent)         1.00%        
Purchase of common stock at discount (as a percent) 15.00%     15.00%          
Purchase price in relation to common stock price (as a percent) 85.00%                
Maximum number of shares to be purchased under ESPP (in shares)       4,940,000          
Maximum offering period 27 months                
Awards issued during period (in shares)       0          
2018 Equity Incentive Plan                  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                  
Award expiration period             10 years    
Vesting period             4 years    
Future issuance of common shares (in shares)             0