v3.26.1
Share-based compensation - Schedule of the Activity Related to Share Option Awards (Details) - USD ($)
$ / shares in Units, $ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2026
Dec. 31, 2025
Number of Options    
Outstanding as of January 1, 2026 (in shares) 41,778,521  
Granted (in shares) 0  
Exercised (in shares) 0  
Canceled (in shares) (767,981)  
Forfeited (in shares) (1,070,309)  
Outstanding as of June 30, 2026 (in shares) 39,940,231 41,778,521
Options exercisable as of June 30, 2026 (in shares) 9,618,884  
Options unvested as of June 30, 2026 (in shares) 30,321,347  
Weighted-Average Exercise Price    
Outstanding as of January 1, 2026, Weighted-Average Exercise Price (in usd per share) $ 21.43  
Options Canceled, Weighted-Average Exercise Price (in usd per share) 19.42  
Options Forfeited, Weighted-Average Exercise Price (in usd per share) 21.62  
Outstanding as of June 30, 2026, Weighted-Average Exercise Price (in usd per share) 21.46 $ 21.43
Options exercisable, Weighted-Average Exercise Price (in usd per share) 20.06  
Options unvested, Weighted-Average Exercise Price (in usd per share) $ 21.91  
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Additional Disclosures [Abstract]    
Outstanding, Weighted-Average Remaining Contractual Term 8 years 7 months 6 days 9 years 1 month 6 days
Options exercisable, Weighted-Average Remaining Contractual Term 7 years 7 months 6 days  
Options unvested, Weighted-Average Remaining Contractual Term 8 years 10 months 24 days  
Outstanding, Aggregate Intrinsic Value $ 0.0  
Options Exercisable, Aggregate Intrinsic Value 0.0  
Options unvested, Aggregate Intrinsic Value $ 0.0  
Outstanding, Weighted- Average Fair Value (in usd per share) $ 7.17 $ 7.12
Options exercisable, Weighted- Average Fair Value (in usd per share) 2.87  
Options unvested, Weighted- Average Fair Value (in usd per share) $ 8.54