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Share-based compensation (Tables) | 9 Months Ended
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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 years |  | Aggregate Intrinsic Value (in $ thousands)
Outstanding as of December 31, 2024 |  | $8.69 |  | 10,697,288 |  |  | 7.56 |  | $ | — |
Granted |  | 2.61 |  | 536,650 |  |  |  |  |
Forfeited |  | 3.53 |  | (422,773) |  |  |  |  |
Expired |  | 17.41 |  | (302,625) |  |  |  |  |
Exercised |  | 2.18 |  | (146,213) |  |  |  |  |
Outstanding as of September 30, 2025 |  | $8.43 |  | 10,362,327 |  |  | 6.88 |  | $ | — |
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions |
|  | Three Months Ended September 30, |  | Nine Months Ended September 30,
|  | 2025 |  | 2024 |  | 2025 |  | 2024
Expected volatility |  | 100% |  | 95% |  | 100 | % |  | 95 | %
Expected life, (years) |  | 6.08 |  | 6.08 |  | 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 awards |  | Weighted average grant date fair value (in $ per share)
December 31, 2024 | 3,106,310 |  |  | $1.81
Granted | 5,295,765 |  |  | 1.71
Vested (1) | (511,433) |  |  | 5.38
Forfeited | (873,880) |  |  | 1.44
September 30, 2025 | 7,016,762 |  |  | $1.52
(1) Includes 87,054 shares withheld to cover tax withholding obligations in connection with the vesting of RSUs previously granted.

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- Definition Tabular disclosure of the number and weighted-average grant date fair value for restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock units that were granted, vested, or forfeited during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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