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Business concentrations - Summary of Vendors with Product Purchases (Details) - Product purchases [Member] - Vendor Concentration Risk [Member]
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Catalent [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 27.00% 39.00%
Vendor A [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 41.00% 18.00%
Vendor B [Member]    
Disclosure Of Vendors With Product Purchases And Accounts Payable For The Periods [Line Items]    
Concentration Risk, Percentage 30.00% 36.00%