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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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