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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
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-Topic 820
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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
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- Definition

Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method.

+ References

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-Topic 942
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