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Contract revenues - Morphomer Tau small molecule - 2018 license agreement with Eli Lilly and Company (Details)
SFr in Thousands
3 Months Ended 12 Months Ended 78 Months Ended 83 Months Ended
Jan. 23, 2019
CHF (SFr)
Mar. 31, 2020
CHF (SFr)
installment
Sep. 30, 2019
CHF (SFr)
installment
Mar. 31, 2019
CHF (SFr)
Dec. 31, 2025
CHF (SFr)
item
Dec. 31, 2024
CHF (SFr)
Dec. 31, 2023
CHF (SFr)
Dec. 31, 2025
CHF (SFr)
Dec. 31, 2025
CHF (SFr)
Contract revenues                  
Revenue from contracts with customers         SFr 3,573 SFr 27,309 SFr 14,801    
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly and Company                  
Contract revenues                  
Milestone payment received       SFr 80,000          
Period to provide notice of termination of agreement         3 months        
Number of representatives in joint steering committee by each party | item         3        
Revenue from contracts with customers         SFr 0 SFr 0 SFr 0    
Deferred income         0     SFr 0 SFr 0
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly and Company | Clinical and Regulatory | Maximum                  
Contract revenues                  
Transaction price         880,000     880,000 880,000
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly and Company | Commercial | Maximum                  
Contract revenues                  
Transaction price         SFr 900,000     900,000 900,000
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly and Company | Research and Development                  
Contract revenues                  
Deferred research and development costs SFr 6,900                
Revenue from contracts with customers                 SFr 6,900
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly and Company | Right-of-use License                  
Contract revenues                  
Revenue from contracts with customers SFr 73,100             SFr 40,000  
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, First Amendment                  
Contract revenues                  
Total potential collaboration agreement value     SFr 60,000            
Number of installments | installment     2            
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, First Amendment | Quarter 3, 2019                  
Contract revenues                  
Milestone payment receivable     SFr 30,000            
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, First Amendment | March 31, 2020                  
Contract revenues                  
Milestone payment receivable   SFr 30,000 SFr 30,000            
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, Second Amendment                  
Contract revenues                  
Number of installments | installment   2              
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, Second Amendment | March 31, 2020                  
Contract revenues                  
Milestone payment receivable   SFr 10,000              
Morphomer Tau Small Molecule | 2018 License Agreement with Eli Lilly, Second Amendment | Upon first patient dosed in a Phase 2 clinical study of a licensed product in the U.S. or EU.                  
Contract revenues                  
Milestone payment receivable   SFr 60,000