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Income Tax Expense - Disclosure of Income Tax Expense Benefit (Detail) - AUD ($)
 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Current tax      
Current tax on profits for the fiscal year   $ 34 $ 33
Total current tax expense   34 33
Deferred income tax      
Decrease in deferred tax assets $ (2,326,468) 244,144 358,825
Decrease in deferred tax liabilities 2,326,468 (244,144) (358,825)
Total deferred tax (benefit)/expense   0 0
Income tax expense $ 0 $ 34 [1] $ 33 [1]
[1] Income tax expense relates to tax payable for the Immutep subsidiary in the United States.