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Stock-based compensation - Narrative (Details)
$ in Thousands
3 Months Ended
Sep. 26, 2018
shares
Dec. 31, 2022
USD ($)
shares
Dec. 31, 2021
USD ($)
Sep. 30, 2022
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, options   $ 9,400    
Stock based compensation credit   $ 2,325 $ (18,068)  
Aggregate number of common stock shares reserved for issuance (in shares) | shares   757,000   507,000
Employer matching percentage   50.00%    
Percentage of employee's gross pay matched   6.00%    
Employer matching contributions   $ 700    
Restricted Stock Units (RSUs)        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Conversion ratio   1    
Unrecognized compensation cost, stock options   $ 86,300    
Recognize cost weighted average period   3 years    
Grant date fair value   $ 15,500    
Restricted Stock Units (RSUs) | Director        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Performance Stock Unit        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Unrecognized compensation cost, stock options   $ 24,300    
Recognize cost weighted average period   1 year 7 months 6 days    
Grant date fair value   $ 10,100    
Performance Stock Unit | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of PSUs that may vest based on performance   0.00%    
Performance Stock Unit | Minimum | Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Performance Stock Unit | Minimum | Non-Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   1 year    
Performance Stock Unit | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of PSUs that may vest based on performance   150.00%    
Performance Stock Unit | Maximum | Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Performance Stock Unit | Maximum | Non-Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Option        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Recognize cost weighted average period   10 months 24 days    
Award term   10 years    
Expected dividend rate   0.00%    
Performance Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Recognize cost weighted average period   1 year 7 months 6 days    
Award term   10 years    
Unrecognized compensation cost, options   $ 800    
Performance Stock Options | Executive Officers and Senior Level Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   2 years    
Vest outstanding (in shares) | shares   56,250    
Performance Stock Options | Non-Employee        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   5 years    
Performance Stock Options | Minimum | Executive Officers and Senior Level Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of PSUs that may vest based on performance   0.00%    
Performance Stock Options | Maximum | Executive Officers and Senior Level Employees        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Percentage of PSUs that may vest based on performance   150.00%    
Share-based Payment Arrangement        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Capitalized computer software, net   $ 900    
2018 ESPP        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Aggregate number of common stock shares reserved for issuance (in shares) | shares 275,225      
Minimum annual increase in share reserved for issuance | shares 249,470      
Annual automatic Increase in share reserved for issuance (as a percent) 1.00%      
Percentage of payroll deduction to purchase common stock 15.00%      
ESPP eligible employee common stock purchase price ratio 85.00%