Quarterly report pursuant to Section 13 or 15(d)

Common Stock - Additional Information (Detail)

v2.4.1.9
Common Stock - Additional Information (Detail) (USD $)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common stock, shares authorized 50,000,000us-gaap_CommonStockSharesAuthorized   50,000,000us-gaap_CommonStockSharesAuthorized
Common stock, par value $ 0.001us-gaap_CommonStockParOrStatedValuePerShare   $ 0.001us-gaap_CommonStockParOrStatedValuePerShare
Preferred stock, shares authorized 5,000,000us-gaap_PreferredStockSharesAuthorized    
Preferred stock, par value $ 0.001us-gaap_PreferredStockParOrStatedValuePerShare    
Stock option exercises, Shares 0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised  
Restricted stock unit settlements 82,410us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 35,309us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures  
2010 Performance incentive plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares available for future option grants 963,014us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
   
Stock options [Member] | Employees and consultants [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 4 years    
Stock options [Member] | Minimum [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 7 years    
Stock options [Member] | Minimum [Member] | Board of Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 1 year    
Stock options [Member] | Maximum      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award expiration period 10 years    
Stock options [Member] | Maximum | Board of Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Award vesting period 3 years    
Stock options [Member] | 2010 Performance incentive plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for issuance under various plans 2,824,367us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
   
Common shares reserved for options currently outstanding 1,270,817us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedNumberOfShares
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
   
Restricted stock unit awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards currently outstanding 590,536us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
  680,201us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
Award vesting period 4 years    
Restricted stock unit awards [Member] | 2010 Performance incentive plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Common shares reserved for awards currently outstanding 590,536us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember