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Stock-based compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 11, 2021
Oct. 12, 2020
Mar. 31, 2021
Mar. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Options, grants in period (in shares)         645,796    
Management And Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Promissory notes, percentage forgiven     50.00%        
Certain Executives              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Proceeds from noteholders debt     $ 300        
Non-executive Noteholders              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Partial recourse promissory notes         $ 500    
2015 Stock Plan | Management And Employee | OTI              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Partial recourse promissory notes   $ 1,100          
Stated interest rate   0.38%          
Vested options, exercised in period (in shares)   2,883,672          
Unvested options, exercised in period (in shares)   4,603,833          
2015 Stock Plan | Certain Executives              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Compensation cost upon forgiveness of promissory notes       $ 300 $ 300    
2021 Incentive Award Plan              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Number of shares reserved for issuance (in shares) 18,558,576       13,680,487    
Increase in number of shares authorized, annual increase percentage 5.00%            
Number of common stock received upon vesting of each performance stock unit (in shares) 1            
Options, weighted average grant date fair value (in dollars per share)         $ 5.9    
Unamortized stock-based compensation expense of option         $ 27,500    
Option | 2021 Incentive Award Plan              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Option expiration period (up to) 10 years            
Unamortized stock-based compensation expense, period for recognition         1 year 8 months 12 days    
Option | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Minimum exercise price as percentage of fair value of shares on grant date 100.00%            
Option | 2021 Incentive Award Plan | A Shareholder With 10% Ownership              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Option expiration period (up to) 5 years            
Minimum exercise price as percentage of fair value of shares on grant date 110.00%            
Shareholder ownership percentage 10.00%            
Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Options, grants in period (in shares) 1,614,492            
Award vesting period 5 years            
Threshold percentage of exercise price 130.00%            
Threshold consecutive trading days 30 days            
Number of shares forfeited (in shares)             1,614,492
Stock Appreciation Rights | 2021 Incentive Award Plan              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Option expiration period (up to) 10 years            
Restricted Stock              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Stock granted in period, other than options (in shares)         0    
RSAs granted in period (in shares)         $ 0    
Restricted Stock | 2021 Incentive Award Plan              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
RSAs granted in period (in shares)         $ 0    
RSAs vested in period, fair value         $ 100    
Restricted Stock | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting period 4 years            
Award vesting rights, vested percentage 100.00%            
Restricted Stock Units (RSUs)              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Stock granted in period, other than options (in shares)         4,332,224    
RSAs granted in period (in shares)         $ 9.50    
Restricted Stock Units (RSUs) | 2021 Incentive Award Plan              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Unamortized stock-based compensation expense, period for recognition           3 years 2 months 12 days  
Unrecognized stock-based compensation expense           $ 34,200  
Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting period 4 years            
Award vesting rights, vested percentage 100.00%            
Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting period 5 years            
Stock granted in period, other than options (in shares) 807,246            
Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Several Members of the Board of Directors              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Stock granted in period, other than options (in shares)     152,628        
Performance Stock Unit | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting period 4 years            
Stock granted in period, other than options (in shares) 807,246            
Percentage of performance stock units 25.00%            
Performance Stock Unit | 2021 Incentive Award Plan | Minimum | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Performance stock, stock price increase percentage 150.00%            
Performance Stock Unit | 2021 Incentive Award Plan | Maximum | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Performance stock, stock price increase percentage 300.00%            
Share-based Payment Arrangement, Tranche One | Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche One | Restricted Stock | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche One | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche One | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Two | Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Two | Restricted Stock | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Two | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Two | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Three | Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Three | Restricted Stock | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Three | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Three | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Four | Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Four | Restricted Stock | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Four | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | Employee              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 25.00%            
Share-based Payment Arrangement, Tranche Four | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Five | Option | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%            
Share-based Payment Arrangement, Tranche Five | Restricted Stock Units (RSUs) | 2021 Incentive Award Plan | One Senior Advisor              
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]              
Award vesting schedule in percentage 20.00%