Quarterly report pursuant to Section 13 or 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)
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Warrant issued in October 2010 [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Risk-free interest rates 0.26%us-gaap_FairValueAssumptionsRiskFreeInterestRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
0.30%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 6 months 22 days 1 year 7 months 6 days
Expected volatility 49.87%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_OctoberTwoThousandAndTenWarrantMember
41.00%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 1.19%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 3 months  
Expected volatility 63.35%us-gaap_FairValueAssumptionsExpectedVolatilityRate
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesAAndSeriesBWarrantsMember