Significant accounting policies - Proceeds from Grants (Details) - USD ($) $ in Millions |
1 Months Ended | 6 Months Ended | |||
|---|---|---|---|---|---|
Aug. 31, 2022 |
May 31, 2022 |
Jun. 30, 2026 |
Jun. 30, 2025 |
Dec. 31, 2025 |
|
| Government Assistance [Line Items] | |||||
| Grant awarded, amount | $ 3.8 | $ 4.1 | |||
| Government Assistance, Statement of Income or Comprehensive Income [Extensible Enumeration] | Research and Development Expense | ||||
| Reduction of research and development expense | 0.0 | $ 0.0 | |||
| Grant, grants receivable | $ 0.2 | $ 0.2 | |||
| Government Assistance, Asset, Current, Statement of Financial Position [Extensible Enumeration] | Grants Receivable, Net | Grants Receivable, Net | |||
| Additional funding | |||||
| Government Assistance [Line Items] | |||||
| Grant awarded, amount | $ 0.5 | ||||