v3.25.4
Shareholders’ equity - Narrative (Details)
 1 Months Ended 12 Months Ended
Aug. 31, 2022
shares
Dec. 31, 2025
CHF (SFr)
vote
SFr / shares
shares
Dec. 31, 2024
CHF (SFr)
shares
Dec. 31, 2023
CHF (SFr)
shares
Feb. 11, 2025
CHF (SFr)
Dec. 31, 2022
CHF (SFr)
shares
Disclosure of classes of share capital [line items]            
Equity   SFr 80,334,000 SFr 141,637,000 SFr 176,429,000   SFr 235,166,000
Number of shares outstanding (in shares) | shares   40,374,641 40,363,095 36,354,297   36,044,706
Par value per share (in CHF per share) | SFr / shares   SFr 0.10        
Nominal value of treasury shares     SFr 350,000      
Transaction costs related to issuance of treasury shares     631,336      
Number of treasury shares withheld to cover social security and tax liabilities (in shares) | shares   95,630        
PSU, RSU and options            
Disclosure of classes of share capital [line items]            
Decrease in authorized share capital, employee participation   SFr 1,155        
Proceeds from exercise of options   63,266 36,581 SFr 30,959    
Minimum            
Disclosure of classes of share capital [line items]            
Capital range limit   3,672,011        
Minimum | Potential ordinary share transactions            
Disclosure of classes of share capital [line items]            
Capital range limit         SFr 5,490,880  
Maximum            
Disclosure of classes of share capital [line items]            
Capital range limit   5,489,726        
Maximum | Potential ordinary share transactions            
Disclosure of classes of share capital [line items]            
Capital range limit         SFr 3,673,165  
Common shares            
Disclosure of classes of share capital [line items]            
Equity   SFr 4,036,310        
Number of shares outstanding (in shares) | shares   40,363,095        
Number of votes per share | vote   1        
Conditional share capital            
Disclosure of classes of share capital [line items]            
Number of shares outstanding (in shares) | shares   11,546        
Authorized share capital, employee participation   SFr 362,264 363,419      
Number of shares authorized, employee participation (in shares) | shares   3,622,644        
Authorized share capital, financing transactions   SFr 226,087        
Number of shares authorized, financing transactions (in shares) | shares   2,260,870        
Conditional share capital | PSU, RSU and options            
Disclosure of classes of share capital [line items]            
Proceeds from exercise of options   SFr 1,155        
Share capital            
Disclosure of classes of share capital [line items]            
Equity   SFr 4,037,464 4,036,000 3,635,000   SFr 3,604,000
Number of shares outstanding (in shares) | shares   40,374,641        
Treasury share reserve            
Disclosure of classes of share capital [line items]            
Equity   SFr (1,129,000) SFr (981,000) SFr (981,000)   SFr (981,000)
Number of shares outstanding (in shares) | shares   2,962,973 3,500,000 3,500,000    
Increase (decrease) in number of shares outstanding | shares 3,500,000