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Share-based compensation (Tables)
9 Months Ended
Sep. 30, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Share-Based Payment Arrangement, Option, Activity
Movements in the number of awards outstanding under the Plans described above and their related weighted average strike prices are as follows:
Weighted average strike price per share (in $ per share)
Number of
awards
Weighted average remaining life in yearsAggregate Intrinsic Value (in $ thousands)
Outstanding as of December 31, 2024$8.6910,697,288 7.56$— 
Granted2.61536,650 
Forfeited3.53(422,773)
Expired17.41(302,625)
Exercised2.18(146,213)
Outstanding as of September 30, 2025$8.4310,362,327 6.88$— 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
Three Months Ended
September 30,
Nine Months Ended
September 30,
2025202420252024
Expected volatility
100%
95%
100 %95 %
Expected life, (years)
6.086.08
6.08
6.08
Expected dividend yield
— — — — 
Risk-free interest rate
3.87-3.94%
 3.63-4.35%
3.87-4.43%
3.63-4.54%
Schedule of Share-Based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes the RSU awards outstanding as of September 30, 2025:
Number of awardsWeighted average grant date fair value (in $ per share)
December 31, 20243,106,310 $1.81
Granted5,295,765 1.71
Vested (1)
(511,433)5.38
Forfeited(873,880)1.44
September 30, 20257,016,762 $1.52
(1) Includes 87,054 shares withheld to cover tax withholding obligations in connection with the vesting of RSUs previously granted.