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Stock-based compensation - Stock Option Narratives (Details) - USD ($)
$ / shares in Units, $ in Millions
1 Months Ended 3 Months Ended
Jan. 31, 2022
Jun. 30, 2021
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Jul. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award            
Fair value of vested options     $ 0.8 $ 1.2    
Exercised     $ 1.2      
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)     10,677,292   7,757,401  
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average exercise price (usd per share)     $ 4.97   $ 3.72  
2020 Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Additional shares authorized for issuance (shares)   11,980,029        
2021 Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Additional shares authorized for issuance (shares) 4,632,401          
Shares available for grant (shares)     9,710,500     8,133,750
2021 ESPP            
Share-based Compensation Arrangement by Share-based Payment Award            
Shares authorized, shares           903,750
Stock options | 2020 Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Weighted average grant date fair value of shares granted (usd per share)     $ 4.49 $ 1.79    
Share based compensation expense not yet recognized, options     $ 36.1      
Share based compensation expense not yet recognized, recognition period (years)     3 years 3 months 18 days      
Stock options | 2020 Plan | Tranche One            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting percentage (percent)     25.00%      
Vesting period (years)     1 year      
Stock options | 2020 Plan | Tranche Two            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (years)     3 years      
Certain options | 2020 Plan | Tranche Two | Minimum            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (years)     2 years      
Certain options | 2020 Plan | Tranche Two | Maximum            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (years)     4 years      
SARs | 2020 Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Vesting period (years)     4 years      
SARs | 2020 And 2021 Plan            
Share-based Compensation Arrangement by Share-based Payment Award            
Share based compensation expense not yet recognized, options     $ 0.9      
Share based compensation expense not yet recognized, recognition period (years)     3 years 3 months 18 days      
Share-based compensation arrangement by share-based payment award, options, outstanding, number (in shares)     143,631      
Share-based compensation arrangement by share-based payment award, options, outstanding, weighted average exercise price (usd per share)     $ 5.65      
Deferred compensation liability, classified, noncurrent     $ 0.2