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Fair value of financial instruments - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Offsetting Liabilities [Line Items]          
Cash collateral $ 0   $ 0   $ 0
Equity investments [Member]          
Offsetting Liabilities [Line Items]          
Impairment $ 0 $ 0 $ 0 $ 0