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Financial instruments - Fair values and risk management - Cash and Cash Equivalents narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Financial Risk Management And Fair Value Of Financial Instruments [Abstract]        
Cash and cash equivalents $ 32,131 $ 52,251 $ 45,706 $ 146,660