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Common Stock - Summary of Outstanding Warrants (Parenthetical) (Detail) | 9 Months Ended
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Sep. 30, 2014
Series A Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2014-07
Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2014-07
Stock warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2010-10
Pre-Funded Series B Warrants [Member] |
Class of Warrant or Right [Line Items] |
Warrants issued date | 2014-07

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- Definition Class of warrants issue date + References No definition available. + Details
Name: | ogxi_ClassOfWarrantsIssueDate
Namespace Prefix: | ogxi_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_ClassOfWarrantOrRightLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration