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v3.25.2

Expenditure Commitments (Details) $ in Millions | 12 Months Ended
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Jun. 30, 2025 AUD ($)
Expenditure Commitments [Abstract] |
Termination notice period for research and development | 30 days
Research and development termination | $ 1.7

X
- References No definition available. + Details
Name: | athe_ExpenditureCommitmentsAbstract
Namespace Prefix: | athe_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents the amount of research and development contract termination commitments. + References No definition available. + Details
Name: | athe_ResearchAndDevelopmentTerminationCommitments
Namespace Prefix: | athe_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the termination notice period for research and development contracts. + References No definition available. + Details
Name: | athe_TerminationNoticePeriodForResearchAndDevelopmentContracts
Namespace Prefix: | athe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration