v3.25.4
Personnel expenses - Disclosure of Exercise Prices, Number and Weighted Average Remaining Contractual Life of Outstanding Instruments (Details)
 12 Months Ended
Dec. 31, 2025
shares
SFr / shares
Dec. 31, 2024
shares
SFr / shares
Dec. 31, 2023
shares
Disclosure Of Exercise Prices, Number And Weighted Average Remaining Contractual Life Of Outstanding Instruments [Line Items]      
Number of PSUs and RSUs outstanding (in shares) 3,423,001 2,593,065 1,530,661
Weighted average remaining contractual life of outstanding PSUs and RSUs   1 year 4 months 24 days  
Number of instruments outstanding (in shares) 3,423,001 2,593,065 1,812,766
Exercise price, range one      
Disclosure Of Exercise Prices, Number And Weighted Average Remaining Contractual Life Of Outstanding Instruments [Line Items]      
Exercise price of outstanding PSUs and RSUs (in CHF per share) | SFr / shares SFr 0.1 SFr 0.1  
Number of PSUs and RSUs outstanding (in shares) 3,423,001    
Weighted average remaining contractual life of outstanding PSUs and RSUs 1 year 3 months 18 days