Stock-based compensation - Allocated Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2025 |
Jun. 30, 2026 |
Jun. 30, 2025 |
|
| Share-based Payment Arrangement, Expensed | ||||
| Total stock-based compensation expense | $ 5,245 | $ 4,752 | $ 9,625 | $ 9,697 |
| Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense | ||||
| Share-based Payment Arrangement, Expensed | ||||
| Total stock-based compensation expense | 2,913 | 2,737 | 5,279 | 5,659 |
| Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense | ||||
| Share-based Payment Arrangement, Expensed | ||||
| Total stock-based compensation expense | $ 2,332 | $ 2,015 | $ 4,346 | $ 4,038 |