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Stock-based compensation - Narrative (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 26, 2018
shares
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2024
USD ($)
shares
Jun. 30, 2023
USD ($)
Sep. 30, 2023
shares
Aug. 22, 2023
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Unrecognized compensation cost, options   $ 300     $ 300      
Stock based compensation expense (reduction)   $ 13,734 $ 10,598   $ 38,578 $ 18,531    
Share-based payment arrangement, amount capitalized     (100)     (500)    
Aggregate number of common stock shares reserved for issuance (in shares) | shares   664,000     664,000   539,000  
Employer matching percentage         50.00%      
Percentage of employee's gross pay matched         6.00%      
Employer matching contributions   $ 700 $ 700   $ 2,000 $ 2,200    
Abveris                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Share-based payment arrangement, expense (credit)       $ (9,900)        
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   62,300     $ 62,300      
Recognize cost weighted average period         2 years 7 months 6 days      
Grant date fair value   36,900            
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   18,100     $ 18,100      
Recognize cost weighted average period         1 year 3 months 18 days      
Grant date fair value   11,500            
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         2 years      
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         1 year 1 month 6 days      
Award term         10 years      
Performance Stock Options                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Recognize cost weighted average period         9 months 18 days      
Award term         10 years      
Unrecognized compensation cost, options   $ 200     $ 200      
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   30,000     30,000      
Performance Stock Options | Non-Employee                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Vesting period         5 years      
2018 ESPP | Shares subject to options (including performance options) to purchase common stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock based compensation expense (reduction)   $ 500     $ 1,300      
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%              
Inducement Plan                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Maximum aggregate number of shares (in shares) | shares               700,000