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Commitments - Summary of Expenditure Commitments Payable (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Jun. 30, 2023
--- | --- | ---
Commitments [Line Items] |  |
Commercial commitments | $ 63 | $ 47
Within One Year |  |
Commitments [Line Items] |  |
Commercial commitments | $ 63 | $ 47

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- Definition Commercial commitments. + References No definition available. + Details
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Namespace Prefix: | opt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Commitments. + References No definition available. + Details
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Namespace Prefix: | opt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |