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Restatement of comparatives - Schedule of material restatement of profit or loss and other comprehensive income (Detail) - AUD ($)
 6 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Disclosure of Detailed Information about Material Restatement of Profit or Loss and Other Comprehensive Income [Line Items]    
Research and development expense $ (9,359,972) $ (10,988,075)
General and administrative expense (4,276,514) (2,482,582)
Loss before tax (13,721,573) (13,517,822)
Income tax benefit 135,546 315,974
Loss after tax $ (13,586,027) $ (13,201,848)
Impact on basic and diluted earnings per share increase/(decrease) in earning per share    
Basic loss for the year attributable to equity holders $ (9.327) $ (10)
Diluted loss for the year attributable to equity holders $ (9.327) $ (10)
Previously stated [member]    
Disclosure of Detailed Information about Material Restatement of Profit or Loss and Other Comprehensive Income [Line Items]    
Research and development expense   $ (11,029,851)
General and administrative expense   (2,261,366)
Loss before tax   (13,338,382)
Income tax benefit   315,974
Loss after tax   $ (13,022,408)
Impact on basic and diluted earnings per share increase/(decrease) in earning per share    
Basic loss for the year attributable to equity holders   $ (9.864)
Diluted loss for the year attributable to equity holders   $ (9.864)
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   $ 41,776
General and administrative expense   (221,216)
Loss before tax   (179,440)
Income tax benefit   0
Loss after tax   $ (179,440)
Impact on basic and diluted earnings per share increase/(decrease) in earning per share    
Basic loss for the year attributable to equity holders   $ (0.136)
Diluted loss for the year attributable to equity holders   $ (0.136)