v3.26.1
Derivative financial instruments - inputs (Details) - CHF (SFr)
1 Months Ended 12 Months Ended
Jun. 30, 2025
Dec. 31, 2025
Preferred shares    
Disclosure of fair value measurement of assets    
Financial assets   SFr 285,962
Preferred shares | Underlying share price    
Disclosure of fair value measurement of assets    
Percentage of reasonably possible increase in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 21,697
Percentage of reasonably possible decrease in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (20,357)
Preferred shares | Underlying share price | Minimum    
Disclosure of fair value measurement of assets    
Significant unobservable input   17
Preferred shares | Underlying share price | Maximum    
Disclosure of fair value measurement of assets    
Significant unobservable input   30
Phantom shares    
Disclosure of fair value measurement of assets    
Financial assets   SFr 285,962
Phantom shares | Underlying share price    
Disclosure of fair value measurement of assets    
Significant unobservable input   17
Percentage of reasonably possible increase in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 39,682
Percentage of reasonably possible decrease in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (36,138)
Anti-dilution protection    
Disclosure of fair value measurement of assets    
Financial assets   SFr 102,547
Anti-dilution protection | Sale price of shares    
Disclosure of fair value measurement of assets    
Percentage of reasonably possible increase in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 25,064
Percentage of reasonably possible decrease in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (18,949)
Anti-dilution protection | Sale price of shares | Minimum    
Disclosure of fair value measurement of assets    
Significant unobservable input   17
Anti-dilution protection | Sale price of shares | Maximum    
Disclosure of fair value measurement of assets    
Significant unobservable input   30
Warrants received with ten-year exercise period    
Disclosure of fair value measurement of assets    
Financial assets   SFr 60,547
Warrants received with ten-year exercise period | Underlying share price    
Disclosure of fair value measurement of assets    
Significant unobservable input   17
Percentage of reasonably possible increase in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 15,673
Percentage of reasonably possible decrease in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (12,791)
Warrants received with five-year exercise period    
Disclosure of fair value measurement of assets    
Financial assets   SFr 60,011
Warrants received with five-year exercise period | Underlying share price    
Disclosure of fair value measurement of assets    
Significant unobservable input   17
Percentage of reasonably possible increase in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 6,091
Percentage of reasonably possible decrease in unobservable input   10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (5,538)
Stalicla SA    
Disclosure of fair value measurement of assets    
Subscription price for investment in Stalicla SA SFr 795,029  
Stalicla SA | Preferred shares | Underlying share price    
Disclosure of fair value measurement of assets    
Subscription price for investment in Stalicla SA SFr 795,029