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Fair value measurements (Tables) | 9 Months Ended
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Sep. 30, 2025
Fair Value Disclosures [Abstract] |
Schedule of Fair Value, Liabilities Measured on Recurring Basis | As of September 30, 2025, the fair value of the major classes of the Company's assets and liabilities measured at fair value on a recurring basis were as follows:
| Level 1 | Level 2 | Level 3 | Investments Measured at Net Asset Value | Total
| (in thousands)
Assets: |  |  |  |  |
Investments in equity 1 | $ | — |  | $ | — |  | $ | — |  | $ | 67,784 |  | $ | 67,784 |
Total assets | $ | — |  | $ | — |  | $ | — |  | $ | 67,784 |  | $ | 67,784 |
As of December 31, 2024, the fair value of the major classes of the Company's assets and liabilities measured at fair value on a recurring basis were as follows:
| Level 1 | Level 2 | Level 3 | Investments Measured at Net Asset Value | Total
| (in thousands)
Assets: |  |  |  |  |
Investments in equity 1 | $ | — |  | $ | — |  | $ | — |  | $ | 54,448 |  | $ | 54,448 |
Total assets | $ | — |  | $ | — |  | $ | — |  | $ | 54,448 |  | $ | 54,448 |
1 To determine the classification of its investments in equity, the Company considered the nature of its investment, the extent of influence over operating and financial decisions and the availability of readily determinable fair values. The Company determined that certain interests in funds meet the definition of equity securities without readily determinable fair values, which qualify for the Net Asset Value (NAV) practical expedient in ASC 820 'Fair value measurement'. Any increases or decreases in fair value are recognized in net income in the period. Investments in equity excludes investments in equity securities recorded at cost of $3.5 million (December 31, 2024: $3.5 million) which do not qualify for the NAV practical expedient.
Schedule of Fair Value, Assets Measured on Recurring Basis | As of September 30, 2025, the fair value of the major classes of the Company's assets and liabilities measured at fair value on a recurring basis were as follows:
| Level 1 | Level 2 | Level 3 | Investments Measured at Net Asset Value | Total
| (in thousands)
Assets: |  |  |  |  |
Investments in equity 1 | $ | — |  | $ | — |  | $ | — |  | $ | 67,784 |  | $ | 67,784 |
Total assets | $ | — |  | $ | — |  | $ | — |  | $ | 67,784 |  | $ | 67,784 |
As of December 31, 2024, the fair value of the major classes of the Company's assets and liabilities measured at fair value on a recurring basis were as follows:
| Level 1 | Level 2 | Level 3 | Investments Measured at Net Asset Value | Total
| (in thousands)
Assets: |  |  |  |  |
Investments in equity 1 | $ | — |  | $ | — |  | $ | — |  | $ | 54,448 |  | $ | 54,448 |
Total assets | $ | — |  | $ | — |  | $ | — |  | $ | 54,448 |  | $ | 54,448 |
1 To determine the classification of its investments in equity, the Company considered the nature of its investment, the extent of influence over operating and financial decisions and the availability of readily determinable fair values. The Company determined that certain interests in funds meet the definition of equity securities without readily determinable fair values, which qualify for the Net Asset Value (NAV) practical expedient in ASC 820 'Fair value measurement'. Any increases or decreases in fair value are recognized in net income in the period. Investments in equity excludes investments in equity securities recorded at cost of $3.5 million (December 31, 2024: $3.5 million) which do not qualify for the NAV practical expedient.

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). Where the quoted price in an active market for the identical liability is not available, the Level 1 input is the quoted price of an identical liability when traded as an asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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