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Subsidiaries - Summary of Subsidiaries (Detail)
12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Immutep USA, Inc [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation United States  
Equity holdings 100.00% 100.00%
PRR Middle East FZ LLC [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation United Arab Emirates  
Equity holdings 100.00% 100.00%
Immutep GmbH [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation Germany  
Equity holdings 100.00% 100.00%
Immutep Australia Pty Ltd [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation Australia  
Equity holdings 100.00% 100.00%
Immutep IP Pty Ltd [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation Australia  
Equity holdings 100.00% 100.00%
Immutep S.A.S. [member]    
Disclosure of subsidiaries [line items]    
Country of incorporation France  
Equity holdings 100.00% 100.00%