Annual report pursuant to Section 13 and 15(d)

Common Stock - Additional Information (Detail)

v2.4.1.9
Common Stock - Additional Information (Detail) (USD $)
 0 Months Ended 1 Months Ended 12 Months Ended
Jul. 02, 2014
Mar. 27, 2012
Oct. 22, 2010
Oct. 31, 2010
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Sep. 30, 2014
Mar. 21, 2012
Jun. 30, 2013
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          
Common stock, shares issued     3,174,602us-gaap_CommonStockSharesIssued   22,630,652us-gaap_CommonStockSharesIssued 14,707,886us-gaap_CommonStockSharesIssued     4,165,000us-gaap_CommonStockSharesIssued  
Common stock, purchase price                 $ 12.00us-gaap_SaleOfStockPricePerShare  
Public offering, unit description         Each unit consisting of one share of our common stock and one-half (1/2) of one warrant          
Proceeds from ATM Financing, net of issuance costs   $ 53,800,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity $ 50,000,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity   $ 57,500,000us-gaap_ProceedsFromIssuanceOrSaleOfEquity          
Exercise price per unit of warrant     $ 20us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1              
Black-Scholes value of the warrant on an assumed risk-free rate         1.83%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 1.25%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate 0.96%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate      
Black-Scholes value of the warrant on volatility         82.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 86.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate 95.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate      
Black-Scholes value of the warrant expected life         5 years 10 months 24 days 5 years 9 months 18 days 5 years 10 months 24 days      
Net proceeds to OncoGenex, from the sale of the units 24,000,000us-gaap_ProceedsFromIssuanceOfWarrants     46,700,000us-gaap_ProceedsFromIssuanceOfWarrants            
Allocation to common shares       32,300,000ogxi_AdditionalCommonSharesDueToAllocatedByProceedsFromWarrantIssued            
Allocation to warrant liability       15,400,000ogxi_AdditionalWarrantLiabilityDueToAllocatedByProceedsFromWarrantIssued            
Underwriting discounts and commissions and other offering expenses allocated to the value of warrants       1,000,000ogxi_WarrantIssuanceExpenses            
Net proceeds         22,372,000us-gaap_ProceedsFromIssuanceOfCommonStock   53,777,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Offering expenses         100,000us-gaap_PaymentsOfStockIssuanceCosts          
Common stock available for sale under offering               22,000,000ogxi_CommonStockSalesAgreementNetAmount    
Net proceeds received from offering after deducting underwriting discount and offering expenses 22,400,000ogxi_NetProceedsReceivedFromOfferingAfterDeductingUnderwritingDiscountsAndOfferingExpenses                  
Warrant issuance costs 1,600,000ogxi_WarrantIssuanceCosts       531,000ogxi_WarrantIssuanceCosts          
Stock option exercises, Shares         10,000us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 3,475us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised 117,347us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised      
Restricted stock unit settlements         203,148us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 47,495us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures 0us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardNetOfForfeitures      
Common shares reserved for options currently outstanding         1,283,419us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions          
2010 Performance incentive plan [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common shares available for future option grants         943,157us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember 		1,016,553us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember 		       
2010 Performance incentive plan [Member] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock available for issuance under performance incentive plan           1,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		450,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember 		     
2010 Performance incentive plan [Member] | Minimum [Member] | Employees and consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         3 years          
2010 Performance incentive plan [Member] | Minimum [Member] | Board of Directors [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         1 year          
2010 Performance incentive plan [Member] | Maximum                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Stock available for issuance under performance incentive plan           2,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		1,050,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember 		     
Award expiration period         10 years          
2010 Performance incentive plan [Member] | Maximum | Employees and consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         4 years          
2010 Performance incentive plan [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] | Minimum [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award expiration period         7 years          
Stock options [Member] | Minimum [Member] | Employees and consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         3 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 | Employees and consultants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Award vesting period         4 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         2,906,777us-gaap_DeferredCompensationArrangementWithIndividualCommonStockReservedForFutureIssuance
/ us-gaap_AwardTypeAxis
= us-gaap_StockOptionMember
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember 		         
Common shares reserved for options currently outstanding         1,283,419us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansExercisePriceRangeNumberOfOutstandingOptions
/ 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         680,201us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		356,589us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember 		172,085us-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         680,201us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockUnitsRSUMember
/ us-gaap_PlanNameAxis
= ogxi_PerformanceIncentivePlanMember 		         
Series B Pre-Funded Common Stock Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares issued 1,340,538us-gaap_CommonStockSharesIssued
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		                 
Net proceeds to OncoGenex, from the sale of the units 3,387,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		                 
Registered Offering, price per unit $ 3.47us-gaap_SharesIssuedPricePerShare
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		                 
Warrant issuance costs 213,000ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		                 
Series A Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Net proceeds to OncoGenex, from the sale of the units 5,261,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember 		                 
Warrant issuance costs 428,000ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember 		                 
Series B Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Net proceeds to OncoGenex, from the sale of the units 1,268,000us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember 		                 
Warrant issuance costs 103,000ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember 		                 
Series A [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Shares issued in financing, Shares 5,559,866us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		                 
Registered Offering, price per unit $ 3.48us-gaap_SharesIssuedPricePerShare
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		                 
Common stock purchase right description         Each Series A unit consisted of one share of common stock and a Series A warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share.          
Series A [Member] | Series A Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Strike price of warrants $ 4.00invest_InvestmentWarrantsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember 		                 
Warrant exercisable period 5 years                  
Series B [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock purchase right description         Each Series B unit consisted of a Pre-Funded Series B warrant to purchase up to one share of common stock at an initial exercise price of $0.01 per share and a Series B warrant to purchase up to one-half of one share of common stock at an initial exercise price of $4.00 per share.          
Series B [Member] | Series B Pre-Funded Common Stock Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Strike price of warrants $ 0.01invest_InvestmentWarrantsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBMember 		                 
Warrant exercisable period         5 years          
Series B [Member] | Series B Warrants [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Strike price of warrants $ 4.00invest_InvestmentWarrantsExercisePrice
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember
/ us-gaap_StatementClassOfStockAxis
= us-gaap_SeriesBMember 		                 
Warrant exercisable period         5 years          
MLV [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares issued         809,214us-gaap_CommonStockSharesIssued
/ us-gaap_CounterpartyNameAxis
= ogxi_MlvMember 		0us-gaap_CommonStockSharesIssued
/ us-gaap_CounterpartyNameAxis
= ogxi_MlvMember 		       
Common stock sales agreement aggregate offering amount                   25,000,000ogxi_CommonStockSalesAgreementAggregateOfferingAmount
/ us-gaap_CounterpartyNameAxis
= ogxi_MlvMember
Common stock sales agreement aggregate commission in percentage                   3.00%ogxi_CommonStockSalesAgreementCommissionInPercentage
/ us-gaap_CounterpartyNameAxis
= ogxi_MlvMember
Net proceeds         $ 3,000,000us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_CounterpartyNameAxis
= ogxi_MlvMember 		         
Additional offering on exercise of overallotment option [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, shares issued                 624,750us-gaap_CommonStockSharesIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= ogxi_AdditionalOfferingOnExerciseOfOverallotmentOptionMember 		 
Common stock, purchase price                 $ 12.00us-gaap_SaleOfStockPricePerShare
/ us-gaap_SubsidiarySaleOfStockAxis
= ogxi_AdditionalOfferingOnExerciseOfOverallotmentOptionMember 		 
Common Stock And Warrant                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Common stock, purchase price     $ 15.75us-gaap_SaleOfStockPricePerShare
/ us-gaap_StatementEquityComponentsAxis
= ogxi_CommonStockAndWarrantMember 		             
Warrant [Member]                    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                    
Exercise price per unit of warrant         $ 20.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember 		         
Black-Scholes value of the warrant on an assumed risk-free rate       1.17%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsRiskFreeInterestRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember 		           
Black-Scholes value of the warrant on volatility       75.00%us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardFairValueAssumptionsExpectedVolatilityRate
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_WarrantMember 		           
Black-Scholes value of the warrant expected life       5 years