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Business concentrations - Summary of Vendors Accounted for 10% or Greater of Accounts Payable (Details) - Vendor Concentration Risk [Member] - Accounts Payable [Member]
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Vendor E [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 15.00% 17.00%
Vendor F [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 23.00% 16.00%
Vendor G [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage   10.00%
Vendor H [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 15.00%