Annual report pursuant to Section 13 and 15(d)

Common Stock - Summary of Fair Value of Warrants Issued (Detail)

v2.4.1.9
Common Stock - Summary of Fair Value of Warrants Issued (Detail)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Warrant issued in October 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rates 0.25%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
0.33%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
Expected dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
Expected life 9 months 22 days 1 year 9 months 18 days
Expected volatility 113.49%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
39.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
Series A and Series B Warrants issued in July 2014 Financing    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rates 1.51%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesAAndSeriesBWarrantsMember
 
Expected dividend yield 0.00%us-gaap_FairValueAssumptionsExpectedDividendRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesAAndSeriesBWarrantsMember
 
Expected life 4 years 6 months  
Expected volatility 62.91%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesAAndSeriesBWarrantsMember