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Property, plant and equipment - Additional Information (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Property, plant and equipment      
Depreciation expense $ 1.5 $ 1.6  
Cost of sales      
Property, plant and equipment      
Depreciation expense $ 1.2   $ 1.2