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Contingent consideration - Additional Information (Detail)
 12 Months Ended
Jun. 30, 2022
AUD ($)
Milestone
Jun. 30, 2022
EUR (€)
Milestone
Jun. 30, 2021
Disclosure of contingent liabilities [line items]      
Milestone payments not booked $ 456,063,136 € 300,500,000  
Milestone payment discount rate 15.00% 15.00% 15.00%
Glioblast Pty Ltd [member]      
Disclosure of contingent liabilities [line items]      
Number of contingent milestone payments | Milestone 4 4  
Milestone Two [member]      
Disclosure of contingent liabilities [line items]      
Contingent consideration | $ $ 1,250,000