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Investments in marketable securities - Narrative (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2025 USD ($) numberOfSegments | Mar. 31, 2024 USD ($) | Dec. 31, 2024 USD ($) numberOfSegments
Investments, Debt and Equity Securities [Abstract] |  |  |
Investments in marketable securities, fair value | $ 75,631 |  | $ 86,293
Debt securities, available-for-sale, unrealized loss Position, number of positions | numberOfSegments | 14 |  | 6
Accrued investment income receivable | $ 200 |  | $ 200
Realized gains or losses | $ 0 | $ 100 |

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