v3.26.1
Material accounting estimates and judgments - (Details) - CHF (SFr)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Material accounting estimates and judgments          
Percentage of reasonably possible increase in volatility assumption     20.00% 20.00% 20.00%
Percentage of reasonably possible decrease in volatility assumption     (20.00%) (20.00%) (20.00%)
Risk free interest rate assumption, high amount     1.00% 1.00% 1.00%
Risk free interest rate assumption, low amount     0.50% 0.50% 0.50%
Expense from share-based payment transactions     SFr 70,820 SFr 175,283 SFr 280,200
Continuing and discontinued operations          
Material accounting estimates and judgments          
Expense from share-based transactions, if calculated on higher reasonably possible assumptions     55,000 1,300,000 1,300,000
Expense from share-based transactions, if calculated on lower reasonably possible assumptions     82,000 1,900,000 2,100,000
Expense from share-based payment transactions     71,000 1,700,000 SFr 1,800,000
Neurosterix US Holdings LLC          
Material accounting estimates and judgments          
Equity interest received 20.00% 20.00%      
Impairment loss     SFr 0 SFr 0