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Share-based compensation - Schedule of RSU Activity (Details) - Restricted Stock Units
 9 Months Ended
Sep. 30, 2025
$ / shares
shares
Number of awards  
Beginning balance (in shares) 3,106,310
Granted (in shares) 5,295,765
Vested (in shares) (511,433)
Forfeited (in shares) (873,880)
Ending balance (in shares) 7,016,762
Weighted average grant date fair value  
Beginning balance (in dollars per share) | $ / shares $ 1.81
Granted (in dollars per share) | $ / shares 1.71
Vested (in dollars per share) | $ / shares 5.38
Forfeited (in dollars per share) | $ / shares 1.44
Ending balance (in dollars per share) | $ / shares $ 1.52
Shares withheld for tax withholding obligations 87,054