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Significant accounting policies - Summary Of Estimated Useful Lives For Property, Plant and Equipment (Details)
 12 Months Ended
Dec. 31, 2021
Computers [Member] | Bottom of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 2 years
Computers [Member] | Top of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 3 years
Building and renovation [Member] | Bottom of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 3 years
Building and renovation [Member] | Top of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 4 years
Motor vehicles [Member] | Bottom of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 5 years
Motor vehicles [Member] | Top of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 7 years
Office and other equipment [Member] | Bottom of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 4 years
Office and other equipment [Member] | Top of range [member]  
Disclosure Of Estimated Useful Lives For Current And Comparative Years Of Property Plant and Equipment [Line Items]  
Useful lives for the current and comparative years 5 years