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Property and equipment - Narrative (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Property, Plant and Equipment [Abstract]        
Property and equipment, depreciation expense $ 0.2 $ 0.2 $ 0.4 $ 0.4