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Cover
 12 Months Ended
Jun. 30, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard International Financial Reporting Standards
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Jun. 30, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name ALTERITY THERAPEUTICS LIMITED
Entity Central Index Key 0001131343
Entity File Number 000-49843
Entity Incorporation, State or Country Code C3
Current Fiscal Year End Date --06-30
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One Level 14, 350 Collins Street
Entity Address, City or Town Melbourne
Entity Address, Country AU
Entity Address, Postal Zip Code 3000
Entity Listings [Line Items]  
Title of 12(b) Security American Depositary Shares, each representing 600 Ordinary Shares
Trading Symbol ATHE
Security Exchange Name NASDAQ
Entity Common Stock, Shares Outstanding 9,127,370,686
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name David Stamler
Entity Address, Address Line One Level 14, 350 Collins Street
Entity Address, City or Town Melbourne
Entity Address, Country AU
Entity Address, Postal Zip Code 3000
Entity Phone Fax Numbers [Line Items]  
City Area Code +61
Local Phone Number 3 9349 4906