XML 103 R91.htm IDEA: XBRL DOCUMENT
v3.25.2

Gain on Remeasurement of Financial Liability -DFA - Summary of Gain on Remeasurement of Financial Liability DFA (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2023
Material income and expense [abstract] |  |  |
Gain on remeasurement of financial liability - DFA | $ 0 | $ 387 | $ 12,302

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

X
- Definition Gain on remeasurement of financial liability dfa. + References No definition available. + Details
Name: | opt_GainOnRemeasurementOfFinancialLiabilityDfa
Namespace Prefix: | opt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration