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Business concentrations - Summary of Customers with Product Revenue (Details) - Customer Concentration Risk [Member] - Revenue [Member]
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Customer A [Member]    
Disclosure Of Customers With Product Revenue and Account Receivable For The Period [Line Items]    
Concentration Risk, Percentage 10.00% 14.00%
Customer B [Member]    
Disclosure Of Customers With Product Revenue and Account Receivable For The Period [Line Items]    
Concentration Risk, Percentage 16.00% 8.00%
Customer C [Member]    
Disclosure Of Customers With Product Revenue and Account Receivable For The Period [Line Items]    
Concentration Risk, Percentage 18.00% 9.00%
Customer D [Member]    
Disclosure Of Customers With Product Revenue and Account Receivable For The Period [Line Items]    
Concentration Risk, Percentage   8.00%
Customer E [Member]    
Disclosure Of Customers With Product Revenue and Account Receivable For The Period [Line Items]    
Concentration Risk, Percentage 12.00%