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Significant accounting policies - Property, plant and equipment (Details)
 12 Months Ended
Dec. 31, 2021
Computer equipment  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property, plant and equipment 3 years
Maximum | Leasehold improvements  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property, plant and equipment 9 years
Minimum | Leasehold improvements  
Disclosure of detailed information about property, plant and equipment [line items]  
Estimated useful lives of property, plant and equipment 5 years