XML 100 R86.htm IDEA: XBRL DOCUMENT
v3.25.2

Share Based Payments - Schedule of Valuations of Options Approved and Issued (Details) | 12 Months Ended
--- | ---
Jun. 30, 2025 $ / shares
ATHAAB[Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | September 18,2020
Exercise Price per Share | $ 0.09
Share Price at Grant Date | $ 0.05
Years to Expiry | 5 years
Risk-free Interest Rate | 0.43%
Expected Share Price Volatility | 98.00%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.032
ATHAAD[Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | January 7,2021
Exercise Price per Share | $ 0.03
Share Price at Grant Date | $ 0.032
Years to Expiry | 5 years
Risk-free Interest Rate | 0.38%
Expected Share Price Volatility | 139.52%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.028
ATHAAE [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | November 29, 2021
Exercise Price per Share | $ 0.04
Share Price at Grant Date | $ 0.025
Years to Expiry | 5 years
Risk-free Interest Rate | 1.35%
Expected Share Price Volatility | 138.47%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.021
ATHAAF [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | July 31, 2021
Exercise Price per Share | $ 0.07
Share Price at Grant Date | $ 0.034
Years to Expiry | 5 years
Risk-free Interest Rate | 0.13%
Expected Share Price Volatility | 169.42%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.027
ATHAAG [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | November 29, 2021
Exercise Price per Share | $ 0.02
Share Price at Grant Date | $ 0.0238
Years to Expiry | 5 years
Risk-free Interest Rate | 1.35%
Expected Share Price Volatility | 138.47%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.021
ATHAAH [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | December 21, 2023
Exercise Price per Share | $ 0.01
Share Price at Grant Date | $ 0.0065
Years to Expiry | 3 years
Risk-free Interest Rate | 3.67%
Expected Share Price Volatility | 133.87%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.005
ATHAA [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | March 13, 2024
Exercise Price per Share | $ 0.004
Share Price at Grant Date | $ 0.004
Years to Expiry | 5 years
Risk-free Interest Rate | 3.47%
Expected Share Price Volatility | 158.31%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.004
ATHAB [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | March 13, 2024
Exercise Price per Share | $ 0.004
Share Price at Grant Date | $ 0.004
Years to Expiry | 5 years
Risk-free Interest Rate | 3.47%
Expected Share Price Volatility | 158.31%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.004
ATHAC [Member] |
Schedule of Valuations of Options Approved and Issued [Line Items] |
Grant Date | March 21, 2024
Exercise Price per Share | $ 0.003
Share Price at Grant Date | $ 0.004
Years to Expiry | 5 years
Risk-free Interest Rate | 3.48%
Expected Share Price Volatility | 158.83%
Dividend Yield | 0.00%
Fair Value per Options | $ 0.004

X
- Definition Fair value per option. + References No definition available. + Details
Name: | athe_FairValuePerOptions
Namespace Prefix: | athe_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage of risk-free interest rate. + References No definition available. + Details
Name: | athe_RiskfreeInterestRate
Namespace Prefix: | athe_
Data Type: | dtr:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Share price at grant date. + References No definition available. + Details
Name: | athe_SharePriceAtGrantDate
Namespace Prefix: | athe_
Data Type: | dtr:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition Years to expiry. + References No definition available. + Details
Name: | athe_YearsToExpiry
Namespace Prefix: | athe_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The date on which share-based payment arrangements are granted. [Refer: Types of share-based payment arrangements [domain]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 45 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_45_a&doctype=Standard -URIDate 2024-03-27 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph IG23 -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_IG23&doctype=Implementation%20Guidance -URIDate 2024-03-27 + Details
Name: | ifrs-full_DateOfGrantOfSharebasedPaymentArrangement
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The expected volatility of the share price used to calculate the fair value of the share options granted. Expected volatility is a measure of the amount by which a price is expected to fluctuate during a period. The measure of volatility used in option pricing models is the annualised standard deviation of the continuously compounded rates of return on the share over a period of time. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_DescriptionOfExpectedVolatilityShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
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 exercise price of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ExercisePriceShareOptionsGranted2019
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:perShareItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of an expected dividend used to calculate the fair value of share options granted. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2024-01-01 -Paragraph 47 -Subparagraph a -Clause i -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2024-en-r&anchor=para_47_a_i&doctype=Standard -URIDate 2024-03-27 + Details
Name: | ifrs-full_ExpectedDividendAsPercentageShareOptionsGranted
Namespace Prefix: | ifrs-full_
Data Type: | dtr-2022:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAABMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAADMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAAEMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAAFMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAAGMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAAHMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHAAMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHABMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | athe_OptionsSeriesAxis=athe_ATHACMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |