v3.25.2
Share-based compensation (Tables)
 6 Months Ended
Jun. 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$8.6910,697,288 7.56$— 
Granted2.54362,950 
Forfeited3.62(320,972)
Expired17.62(75,599)
Exercised1.87(18,565)
Outstanding as of June 30, 2025$8.5910,645,102 6.96$— 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions
The fair values of the options granted during the three and six months ended June 30, 2025 and 2024 were determined on the date of grant using the following assumptions:
Three Months Ended June 30,Six Months Ended June 30,
2025202420252024
Share price, in $
 1.35-3.59
3.31-4.71
1.35-3.59
1.69-4.86
Strike price, in $
1.35-3.59
3.31-4.71
1.35-3.59
1.69-4.86
Expected volatility, in %
100
95
100 95 
Award life, in years
6.086.08
6.08
6.08
Expected dividends
— — — — 
Risk-free interest rate, in %
3.97-4.14
 4.24-4.54
3.97-4.43
3.75-4.54
Schedule of Share-Based Payment Arrangement, Restricted Stock Unit, Activity
The following table summarizes the RSU awards outstanding as of June 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(487,974)1.42
June 30, 20257,402,668 $1.52
(1) Includes 87,054 shares withheld to cover tax withholding obligations in connection with the vesting of RSUs previously granted.