Financial risk management - Sensitivity Analysis to Reasonable Possible Change in Exchange Rates (Details) - Currency risk - CHF (SFr) SFr in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2025 |
Dec. 31, 2024 |
Dec. 31, 2023 |
|
| USD Positions | |||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | |||
| Increase in exchange rates | 10.00% | 10.00% | 10.00% |
| Decrease in exchange rates | (10.00%) | (10.00%) | (10.00%) |
| Effect on result before tax if exchange rates increase | SFr 2,289 | SFr 4,468 | SFr 4,718 |
| Effect on result before tax if interest rates decrease | SFr (2,289) | SFr (4,468) | SFr (4,718) |
| EUR Positions | |||
| Disclosure of nature and extent of risks arising from financial instruments [line items] | |||
| Increase in exchange rates | 10.00% | 10.00% | 10.00% |
| Decrease in exchange rates | (10.00%) | (10.00%) | (10.00%) |
| Effect on result before tax if exchange rates increase | SFr 33 | SFr 291 | SFr 479 |
| Effect on result before tax if interest rates decrease | SFr (33) | SFr (291) | SFr (479) |