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Investments in marketable securities - Narrative (Details) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2025 USD ($) numberOfSegments	Dec. 31, 2024 USD ($) numberOfSegments
Marketable Securities [Line Items]
Fair Value		$ 60,676	$ 86,293
Debt securities, available-for-sale, unrealized loss Position, number of positions | numberOfSegments		20	6
Accrued investment income receivable		$ 100	$ 300
Realized gains or losses	$ 100	0
Short Term Marketable Securities
Marketable Securities [Line Items]
Fair Value		60,700	86,300
Long Term Marketable Securities
Marketable Securities [Line Items]
Fair Value		$ 0	$ 0

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Interest, dividends, rents, ancillary and other revenues earned but not yet received by the entity on its investments.

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