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Fixed assets - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Property, Plant and Equipment [Abstract]        
Depreciation $ 0.0 $ 0.2 $ 0.0 $ 0.4