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Earnings Per Share - Summary of Earnings Per Share (Detail) - AUD ($)
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2021
Earnings per share [line items]      
Loss after income tax attributable to the owners of Immutep Limited $ (39,896,348) $ (32,210,826) $ (29,902,624)
Weighted average number of ordinary shares used in calculating basic earnings per share (EPS) 892,399,810 848,968,068 594,927,440
Weighted average number of ordinary shares used in calculating diluted earnings per share (EPS) 892,399,810 848,968,068 594,927,440
Basic earnings per share $ (0.0447) $ (0.0379) $ (0.0503)
Diluted earnings per share $ (0.0447) $ (0.0379) $ (0.0503)