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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