v3.26.3
Derivative financial instruments - inputs (Details) - CHF (SFr)
1 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2026
Dec. 31, 2025
Preferred shares      
Disclosure of fair value measurement of assets      
Financial assets   SFr 285,962 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% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr (21,697) SFr (21,697)
Percentage of reasonably possible decrease in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr 20,357 SFr 20,357
Preferred shares | Underlying share price | Minimum      
Disclosure of fair value measurement of assets      
Significant unobservable input   17 17
Preferred shares | Underlying share price | Maximum      
Disclosure of fair value measurement of assets      
Significant unobservable input   30 30
Phantom shares      
Disclosure of fair value measurement of assets      
Financial assets   SFr 285,962 SFr 285,962
Phantom shares | Underlying share price      
Disclosure of fair value measurement of assets      
Significant unobservable input   17 17
Percentage of reasonably possible increase in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 39,682 SFr 39,682
Percentage of reasonably possible decrease in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (36,138) SFr (36,138)
Anti-dilution protection      
Disclosure of fair value measurement of assets      
Financial assets   SFr 102,547 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% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 25,064 SFr 25,064
Percentage of reasonably possible decrease in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (18,949) SFr (18,949)
Anti-dilution protection | Sale price of shares | Minimum      
Disclosure of fair value measurement of assets      
Significant unobservable input   17 17
Anti-dilution protection | Sale price of shares | Maximum      
Disclosure of fair value measurement of assets      
Significant unobservable input   30 30
Warrants received with ten-year exercise period      
Disclosure of fair value measurement of assets      
Financial assets   SFr 60,547 SFr 60,547
Warrants received with ten-year exercise period | Underlying share price      
Disclosure of fair value measurement of assets      
Significant unobservable input   17 17
Percentage of reasonably possible increase in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 15,673 SFr 15,673
Percentage of reasonably possible decrease in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (12,791) SFr (12,791)
Warrants received with five-year exercise period      
Disclosure of fair value measurement of assets      
Financial assets   SFr 60,011 SFr 60,011
Warrants received with five-year exercise period | Underlying share price      
Disclosure of fair value measurement of assets      
Significant unobservable input   17 17
Percentage of reasonably possible increase in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible increase in unobservable input   SFr 6,091 SFr 6,091
Percentage of reasonably possible decrease in unobservable input   10.00% 10.00%
Increase (decrease) in fair value measurement due to reasonably possible decrease in unobservable input   SFr (5,538) 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