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Contingent consideration - non-current - Summary of reconciliation of contingent consideration (Detail) - AUD ($)
 6 Months Ended
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Disclosure In Tabular Form Of Changes In Contingent Consideration During The Period [Line Items]      
Contingent Consideration $ 8,967,785 $ 11,094,441  
Interest 221,637 414,662 $ 207,068
Loss on revaluation of contingent consideration 85,226 152,287 74,110
Contingent Consideration 9,556,778 8,967,785 $ 11,094,441
Contingent consideration [member]      
Disclosure In Tabular Form Of Changes In Contingent Consideration During The Period [Line Items]      
Foreign currency loss $ 282,130 (328,873)  
EVT801 Licensing Agreement [Member]      
Disclosure In Tabular Form Of Changes In Contingent Consideration During The Period [Line Items]      
Payment of milestone   $ (2,364,732)