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Share-based compensation - Narrative (Details) - shares
9 Months Ended
Jul. 21, 2020
Sep. 30, 2021
Jan. 01, 2021
Nov. 13, 2017
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) 14,800,000   19,479,699  
Share based compensation, number of shares reserved for issuance, period of increases 10 years      
Share based compensation, increase in shares reserved for issuance, minimum percentage increase 4.00%      
Common stock reserved for additional grants under the plan (in shares)   15,544,733    
Stock Option Plan 2017 Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate number of shares of common stock to be issued (in shares)       8,470,000
Common stock reserved for additional grants under the plan (in shares)   128,928    
Awards granted (in shares)   0