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Significant accounting policies (Details)
 12 Months Ended
Dec. 31, 2020
Furniture and fixtures [member] | Minimum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 3 years
Furniture and fixtures [member] | Maximum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 5 years
Computer equipment [member]  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 3 years
Other equipment [member] | Minimum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 2 years
Other equipment [member] | Maximum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 4 years
Leasehold improvement [member] | Minimum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 3 years
Leasehold improvement [member] | Maximum  
Disclosure Of Significant Accounting Policies [Line Items]  
Useful lives or depreciation rates, property, plant and equipment 15 years