v3.26.1
Share-based compensation - Share option plans - DSPPP (Details) - Deferred Strike Price Payment Plan (DSPPP)
12 Months Ended
Dec. 31, 2025
EquityInstruments
SFr / shares
Dec. 31, 2024
EquityInstruments
SFr / shares
Dec. 31, 2023
EquityInstruments
SFr / shares
Share-based compensation      
Payment deferral period for equity incentive units exercised 10 years    
Expiration period for options 10 years    
Beginning balance 29,950,268 29,958,807 17,438,883
Forfeited (45,578) (8,539) (7,311)
Granted 0 0 12,527,235
Ending balance 29,904,690 29,950,268 29,958,807
Average subscription price / floor price / deferred strike price at beginning of period | SFr / shares SFr 0.09 SFr 0.09 SFr 0.13
Forfeited | SFr / shares 0.07 0.09 0.13
Granted | SFr / shares     0.043
Average subscription price / floor price / deferred strike price at end of period | SFr / shares SFr 0.09 SFr 0.09 SFr 0.09
Shares not subject to sales restrictions 23,632,556 18,512,037  
Shares related to employees and Executive Managers transferred on disposal of operations 8,660,516 25,234,215