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Stock-based compensation - Allocated Share-based Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Share-based Payment Arrangement, Expensed        
Total stock-based compensation expense $ 4,396 $ 5,508 $ 14,093 $ 14,401
Research and development        
Share-based Payment Arrangement, Expensed        
Total stock-based compensation expense 1,982 2,010 6,020 5,577
Selling, general and administrative        
Share-based Payment Arrangement, Expensed        
Total stock-based compensation expense $ 2,414 $ 3,498 $ 8,073 $ 8,824