v3.26.1
Financial risk management - net debt (Details) - CHF (SFr)
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Net debt    
Net asset / (debt) beginning balance SFr 3,306,240 SFr 3,521,993
Cash flows (1,662,000) (544,089)
Effect of modification to lease terms   (23,940)
Disposal   10,178
Assets transferred to Neurosterix Pharma Sarl   242,416
Foreign exchange differences (35,186) 99,682
Net asset / (debt) ending balance 1,609,054 3,306,240
Leases    
Net debt    
Net asset / (debt) beginning balance (41,994) (344,336)
Cash flows 7,306 73,688
Effect of modification to lease terms   (23,940)
Disposal   10,178
Assets transferred to Neurosterix Pharma Sarl   242,416
Net asset / (debt) ending balance (34,688) (41,994)
Cash and cash equivalents    
Net debt    
Net asset / (debt) beginning balance 3,341,738 3,865,481
Cash flows (1,667,940) (623,425)
Foreign exchange differences (35,186) 99,682
Net asset / (debt) ending balance 1,638,612 3,341,738
Other financial assets    
Net debt    
Net asset / (debt) beginning balance 6,496 848
Cash flows (1,366) 5,648
Net asset / (debt) ending balance SFr 5,130 SFr 6,496