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Restatement of comparatives - Schedule of material restatement of profit or loss and other comprehensive income (Detail) - AUD ($)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Disclosure of Detailed Information about Material Restatement of Profit or Loss and Other Comprehensive Income [Line Items]      
Research and development expense (Amortisation) $ (15,564,000) $ (20,169,000) $ (14,541,000)
General and administrative expense (foreign exchange impact)   (4,961,000) (7,020,000)
Loss on revaluation of contingent consideration   (152,000) (2,570,000)
Commercialisation expense 0 (127,000) 0
Loss before tax (20,736,000) (25,382,000) (8,904,000)
Income tax benefit 271,000 368,000 484,000
Loss after tax $ (20,465,180) $ (25,014,055) $ (8,420,000)
Impact on basic and diluted earnings per share increase/ (decrease) in earning per share      
Basic loss for the year attributable to equity holders $ (0.1123) $ (0.1888) $ (0.0716)
Diluted loss for the year attributable to equity holders $ (0.1123) $ (0.1888) $ (0.0716)
Previously stated [member]      
Disclosure of Detailed Information about Material Restatement of Profit or Loss and Other Comprehensive Income [Line Items]      
Research and development expense (Amortisation)   $ (20,252,000) $ (14,541,000)
General and administrative expense (foreign exchange impact)   (4,511,000) (7,022,000)
Loss on revaluation of contingent consideration   (152,000) (2,570,000)
Commercialisation expense   (127,000)  
Loss before tax   (25,016,000) (8,906,000)
Income tax benefit   368,000 484,000
Loss after tax   $ (24,648,000) $ (8,422,000)
Impact on basic and diluted earnings per share increase/ (decrease) in earning per share      
Basic loss for the year attributable to equity holders   $ (0.1861) $ (0.0716)
Diluted loss for the year attributable to equity holders   $ (0.1861) $ (0.0716)
Increase (decrease) due to corrections of prior period errors [Member]      
Disclosure of Detailed Information about Material Restatement of Profit or Loss and Other Comprehensive Income [Line Items]      
Research and development expense (Amortisation)   $ 83,000  
General and administrative expense (foreign exchange impact)   (450,000) $ 2,000
Loss before tax   (366,000) 2,000
Loss after tax   $ (366,000) $ 2,000
Impact on basic and diluted earnings per share increase/ (decrease) in earning per share      
Basic loss for the year attributable to equity holders   $ (0.0027)  
Diluted loss for the year attributable to equity holders   $ (0.0027)