Business concentrations - Summary Of The Vendors With Product Purchases For The Periods (Details)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Catalent [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage	29.00%	24.00%
Vendor A [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage	33.00%	28.00%
Vendor B [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage	32.00%	32.00%
Vendor C [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage		13.00%
Vendor D [Member] | Accounts Payable [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage	19.00%
Vendor E [Member] | Accounts Payable [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage		17.00%
Vendor F [Member] | Accounts Payable [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage		16.00%
Vendor G [Member] | Accounts Payable [Member]
Disclosure Of Vendors With Product Purchases and Accounts Payable For The Periods [Line Items]
Concentration Risk, Percentage		10.00%