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Fair value measurements - Measurement of Fair Value of Major Asset and Liability classed (Details) - USD ($) $ in Thousands | Mar. 31, 2025 | Dec. 31, 2024
--- | --- | ---
Assets: |  |
Investments in equity | $ 62,160 | $ 57,948
Investments in equity securities recorded at cost | 3,500 | 3,500
Fair value, recurring |  |
Assets: |  |
Investments in equity | 58,660 | 54,448
Total assets | 58,660 | 54,448
Level 1 | Fair value, recurring |  |
Assets: |  |
Investments in equity | 0 | 0
Total assets | 0 | 0
Level 2 | Fair value, recurring |  |
Assets: |  |
Investments in equity | 0 | 0
Total assets | 0 | 0
Level 3 | Fair value, recurring |  |
Assets: |  |
Investments in equity | 0 | 0
Total assets | 0 | 0
Investments Measured at Net Asset Value | Fair value, recurring |  |
Assets: |  |
Investments in equity | 58,660 | 54,448
Total assets | $ 58,660 | $ 54,448

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- Definition Fair value portion of asset recognized for present right to economic benefit. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 100 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-100 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -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 3: http://www.xbrl.org/2003/role/disclosureRef -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 Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI) and investment in equity security without readily determinable fair value. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 825 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482736/825-10-45-1A + Details
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