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Significant accounting policies - Intangible assets (other than goodwill) (Details)
 12 Months Ended
Dec. 31, 2022
Website and mobile apps  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 2 years
Trademark and technology | Bottom of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 10 years
Trademark and technology | Top of range [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 20 years
Products development cost  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 3 years
Computer software [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 3 years
Customer relationship [member]  
Disclosure of detailed information about intangible assets [line items]  
Estimated useful lives 10 years