Fair value measurement - Changes in fair value of pre funded warrants (Details) - USD ($) $ in Thousands |
3 Months Ended | 9 Months Ended |
|---|---|---|
Sep. 30, 2025 |
Sep. 30, 2025 |
|
| Fair value measurement | ||
| Beginning balance | $ 0 | |
| Issuance of pre-funded warrants in connection with follow-on public offering | 25,000 | |
| Changes in fair value of liability related to pre-funded warrants | $ 5,700 | 5,722 |
| Ending balance | $ 30,722 | $ 30,722 |