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

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- References

No definition available.

+ Details

Name:	athe_ExpenditureCommitmentsAbstract
Namespace Prefix:	athe_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

Represents the amount of research and development contract termination commitments.

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No definition available.

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Name:	athe_ResearchAndDevelopmentTerminationCommitments
Namespace Prefix:	athe_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- 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