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</LabelSeparator><CurrencyCode>USD</CurrencyCode><FootnoteIndexer /><hasSegments>true</hasSegments><hasScenarios>false</hasScenarios><MCU><KeyName /><CurrencySymbol>$</CurrencySymbol><contextRef><ContextID /><EntitySchema /><EntityValue /><PeriodDisplayName /><PeriodType>na</PeriodType><PeriodStartDate>0001-01-01T00:00:00</PeriodStartDate><PeriodEndDate>0001-01-01T00:00:00</PeriodEndDate><Segments><anyType xsi:type="Segment"><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid in Capital</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></anyType></Segments><Scenarios /></contextRef><UPS /><CurrencyCode>USD</CurrencyCode><OriginalCurrencyCode>USD</OriginalCurrencyCode></MCU><CurrencySymbol>$</CurrencySymbol><Labels><Label Key="" Id="0" Label="Additional Paid in Capital" /></Labels></Column><Column FlagID="0"><Id>8</Id><IsAbstractGroupTitle>false</IsAbstractGroupTitle><EmbedRequirements><EmbedCommands><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementEquityComponentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_StatementScenarioAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>us-gaap_OtherCommitmentsAxis</SelectionString><Selection>Axis</Selection><Style>Compact</Style><Filter>*</Filter></CommandIterator><CommandIterator><Type>Column</Type><SelectionString>unit</SelectionString><Selection>Unit</Selection><Style>Grouped</Style><Filter>*</Filter></CommandIterator></EmbedCommands><Segments><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Additional Paid in Capital</ValueName><ValueType>us-gaap_StatementEquityComponentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>us-gaap_AdditionalPaidInCapitalMember</Id><dimensionId>us-gaap_StatementEquityComponentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>true</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>Scenario, Unspecified [Domain]</ValueName><ValueType>us-gaap_StatementScenarioAxis</ValueType><Namespace /><Schema /><DimensionInfo><Id>us-gaap_ScenarioUnspecifiedDomain</Id><dimensionId>us-gaap_StatementScenarioAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment><Segment><IsDefaultForEntity>false</IsDefaultForEntity><Name /><IsFromEntityGroup>false</IsFromEntityGroup><ValueName>$1.5 Million Purchase Agreement with Lincoln Park</ValueName><ValueType>us-gaap_OtherCommitmentsAxis</ValueType><Namespace>xbrldi</Namespace><Schema>http://xbrl.org/2006/xbrldi</Schema><DimensionInfo><Id>opxa_PurchaseCommitmentOneMember</Id><dimensionId>us-gaap_OtherCommitmentsAxis</dimensionId><type>explicitMember</type></DimensionInfo></Segment></Segments><SegmentLabels><string>Additional Paid in Capital</string><string>Scenario, Unspecified [Domain]</string><string>$1.5 Million Purchase Agreement with Lincoln Park</string></SegmentLabels><Unit><OtherUnits /><UnderlyingUnitProperty><UnitID>iso4217_USD</UnitID><UnitType>Standard</UnitType><StandardMeasure><MeasureSchema>http://www.xbrl.org/2003/iso4217</MeasureSchema><MeasureValue>USD</MeasureValue><MeasureNamespace>iso4217</MeasureNamespace><MeasureDescription /><MeasureType /></StandardMeasure><Scale>0</Scale></UnderlyingUnitProperty></Unit></EmbedRequirements><LabelSeparator>

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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 -Name Staff Accounting Bulletin (SAB)

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Reference 3: http://www.xbrl.org/2003/role/presentationRef

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Reference 4: http://www.xbrl.org/2003/role/presentationRef

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