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Share-based compensation - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Sep. 30, 2021
Mar. 31, 2021
Jan. 01, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Share-based compensation expense $ 16,010   $ 2,832  
Target-based stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 0      
Shares vested (in shares) 0      
Unrecognized compensation expense $ 33,000      
Service-based stock option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Awards granted (in shares) 0      
Unrecognized compensation expense $ 800      
Vesting period 4 years      
Total fair value, options vested in period $ 200      
Weighted average period over which unrecognized compensation expense would be recognized 1 year 4 months 24 days      
Anniversary period 10 years      
Service-based stock option | Tranche one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Percentage of RSUs that vest 25.00%      
Service-based stock option | Tranche two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Percentage of RSUs that vest 25.00%      
Service-based stock option | Tranche three        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Percentage of RSUs that vest 25.00%      
Service-based stock option | Tranche four        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 1 year      
Percentage of RSUs that vest 25.00%      
Unvested restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Weighted average period over which unrecognized compensation expense would be recognized 3 years 4 months 24 days      
Unrecognized compensation expense $ 224,500      
Fair value of units vested $ 800      
Granted (in shares) 1,516,117 413,234    
Share-based compensation expense $ 1,600      
Unvested restricted stock units | Tranche one        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of RSUs that vest   50.00%    
Unvested restricted stock units | Tranche two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Percentage of RSUs that vest   50.00%    
ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation expense $ 200      
Weighted average period over which unrecognized compensation expense would be recognized 1 month      
Eligible employee compensation $ 2,900      
Common stock reserved for future issuance (in shares) 4,194,260      
Common stock issued (in shares) 0      
Omnibus Incentive Plan 2020 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate number of shares of common stock to be issued (in shares)       24,256,740
Common stock reserved for additional grants under the plan (in shares) 15,484,707      
Omnibus Incentive Plan 2020 Plan | Unvested restricted stock units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period 4 years      
Stock Option Plan 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Common stock reserved for additional grants under the plan (in shares) 128,928      
Awards granted (in shares) 0