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Property, plant and equipment - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Depreciation $ 3.4 $ 3.2
Product [Member]    
Property, Plant and Equipment [Line Items]    
Cost, Depreciation $ 1.9 $ 1.7