Operating costs - Additional Information (Details) - CHF (SFr) SFr in Millions |
3 Months Ended | 6 Months Ended |
|---|---|---|
Jun. 30, 2026 |
Jun. 30, 2026 |
|
| Operating costs | ||
| Increase (decrease) in total operating costs | SFr (0.1) | SFr (0.3) |
| Increase (decrease) in professional fees | (0.1) | (0.3) |
| Increase (decrease) external research and development and patent costs | (0.1) | (0.2) |
| Increase (decrease) in expenses recognized for services received at zero cost | (0.1) | |
| Increase (decrease) in staff costs | SFr 0.2 | SFr 0.3 |