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Property and equipment - Additional Information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 2,869 $ 2,266
Property, Plant and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Depreciation expense $ 900 $ 900
Property, Plant and Equipment [Member] | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P2Y  
Property, Plant and Equipment [Member] | Maximum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives P10Y  
Computer software | Minimum    
Property, Plant and Equipment [Line Items]    
Estimated useful lives three