XML 97 R83.htm IDEA: XBRL DOCUMENT v3.25.2

Share Based Payments (Details) shares in Millions	1 Months Ended	12 Months Ended
	Sep. 30, 2020 shares	Jun. 30, 2025	Jun. 30, 2024 shares	Jun. 30, 2023	Jun. 30, 2022 shares	Jun. 30, 2020 shares	Jun. 30, 2009 shares	Jun. 30, 2008 shares	Jun. 30, 2007 shares	Jun. 30, 2005 shares	Jun. 30, 2004 shares
Share Based Payments [Line Items]
Number of director		4	3	4
Key management personnel		1	1	2
Number of employees		7	7	9
Number of consultant		3	4	3
Number of ordinary shares authorized (in Shares)							60.0	45.0	30.0	22.0	12.0
Shareholders authorized securities (in Shares)	157.5
Issued securities value (in Shares)			450.0		240.0
Percentage of default vesting conditions per year		25.00%
Ads Plan 2018 [Member]
Share Based Payments [Line Items]
Issued securities value (in Shares)						200.0
Percentage of default vesting conditions per year		25.00%

X

- Definition

Represents number of consultant of the entity at a date.

+ References

No definition available.

+ Details

Name:	athe_NumberOfConsultant
Namespace Prefix:	athe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of directors of the entity at a date.

+ References

No definition available.

+ Details

Name:	athe_NumberOfDirector
Namespace Prefix:	athe_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Represents number of directors by the key management personnel of the entity at a date.

+ References

No definition available.

+ Details

Name:	athe_NumberOfKeyManagementPersonnel
Namespace Prefix:	athe_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

This element represents amount of percentage of default vesting conditions per year.

+ References

No definition available.

+ Details

Name:	athe_PercentageOfDefaultVestingConditionsPerYear
Namespace Prefix:	athe_
Data Type:	dtr:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of shareholders authorized securities.

+ References

No definition available.

+ Details

Name:	athe_ShareholdersAuthorizedSecurities
Namespace Prefix:	athe_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of personnel employed by the entity at a date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 112
-Subparagraph c
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_112_c&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NumberOfEmployees
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares issued by the entity.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 106
-Subparagraph d
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_106_d&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_NumberOfSharesIssued
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The number of shares reserved for issue under options and contracts for the sale of shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2024-01-01
-Paragraph 79
-Subparagraph a
-Clause vii
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2024-en-r&anchor=para_79_a_vii&doctype=Standard
-URIDate 2024-03-27

+ Details

Name:	ifrs-full_SharesReservedForIssueUnderOptionsAndContractsForSaleOfShares
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	athe_PlanAxis=athe_AdsPlanTwoThousandEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: