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Company information and operations - Additional Information (Details)
$ / shares in Units, $ in Millions
 3 Months Ended 12 Months Ended
Aug. 25, 2021
USD ($)
$ / shares
shares
Jul. 27, 2021
USD ($)
$ / shares
shares
Jun. 30, 2021
Jun. 30, 2023
shares
Mar. 31, 2022
shares
Dec. 31, 2023
$ / shares
shares
Dec. 31, 2022
shares
Dec. 31, 2023
SFr / shares
shares
Dec. 31, 2021
shares
Aug. 25, 2021
SFr / shares
shares
Jul. 27, 2021
SFr / shares
shares
Dec. 31, 2020
shares
Disclosure Of Company Information And Operations [Line Items]                        
Share split ratio     0.05                  
Issued capital                        
Disclosure Of Company Information And Operations [Line Items]                        
Number of shares issued (in shares)           76,898,164 66,398,164 76,898,164 63,857,604     47,955,700
Number of shares outstanding (in shares)           65,230,559 64,231,220 65,230,559        
Issuance of shares to be held as treasury shares (in shares)       10,500,000 2,540,560 10,500,000 2,540,560          
Treasury shares                        
Disclosure Of Company Information And Operations [Line Items]                        
Number of shares issued (in shares)           11,667,605 2,166,944 11,667,605 0     0
Issuance of shares to be held as treasury shares (in shares)           10,500,000 2,540,560          
Ordinary Shares                        
Disclosure Of Company Information And Operations [Line Items]                        
Shares issued, par value (in dollars per share) | (per share)           $ 0.05   SFr 0.05        
Ordinary Shares | Initial Public Offering                        
Disclosure Of Company Information And Operations [Line Items]                        
Number of shares issued (in shares)   13,000,000                 13,000,000  
Shares price per share (in dollars per share) | $ / shares   $ 18.00                    
Shares issued, par value (in dollars per share) | (per share)   $ 0.05                 SFr 0.05  
Net proceeds from IPO | $   $ 211.7                    
Preferred shares were converted into ordinary shares (in shares)   24,561,200                 24,561,200  
Preferred stock conversion ratio 1                 1    
Ordinary Shares | Private Placement                        
Disclosure Of Company Information And Operations [Line Items]                        
Number of shares issued (in shares)   1,111,111                 1,111,111  
Shares price per share (in dollars per share) | $ / shares   $ 18.00                    
Shares issued, par value (in dollars per share) | (per share)   $ 0.05                 SFr 0.05  
Net proceeds from IPO | $   $ 19.6                    
Ordinary Shares | Underwriters                        
Disclosure Of Company Information And Operations [Line Items]                        
Number of shares issued (in shares) 519,493                 519,493    
Shares price per share (in dollars per share) | $ / shares $ 18.00                      
Shares issued, par value (in dollars per share) | (per share) $ 0.05                 SFr 0.05    
Net proceeds from issuance | $ $ 8.5