Annual report pursuant to Section 13 and 15(d)

Common Stock - Schedule of Common Stock (Detail)

v2.4.1.9
Common Stock - Schedule of Common Stock (Detail) (USD $)
In Thousands, except Share data, unless otherwise specified
 0 Months Ended 1 Months Ended 12 Months Ended
Jul. 02, 2014
Oct. 31, 2010
Dec. 31, 2014
Dec. 31, 2012
Class of Warrant or Right [Line Items]        
Gross Proceeds $ 24,000us-gaap_ProceedsFromIssuanceOfWarrants $ 46,700us-gaap_ProceedsFromIssuanceOfWarrants    
Gross Proceeds     22,372us-gaap_ProceedsFromIssuanceOfCommonStock 53,777us-gaap_ProceedsFromIssuanceOfCommonStock
Underwriting discount and offering expense 1,600ogxi_WarrantIssuanceCosts   531ogxi_WarrantIssuanceCosts  
Underwriting discount and offering expense     100us-gaap_PaymentsOfStockIssuanceCosts  
Common stock [Member]        
Class of Warrant or Right [Line Items]        
Common stock shares issued in financing 5,559,866us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		  809,214us-gaap_StockIssuedDuringPeriodSharesNewIssues
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		 
Gross Proceeds 14,084us-gaap_ProceedsFromIssuanceOfCommonStock
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		     
Underwriting discount and offering expense 885us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember 		     
Series B Pre-Funded Common Stock Warrants [Member]        
Class of Warrant or Right [Line Items]        
Warrants Issued 1,340,538us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		     
Gross Proceeds 3,387us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		     
Underwriting discount and offering expense 213ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBPreFundedCommonStockWarrantsMember 		     
Series A Warrants [Member]        
Class of Warrant or Right [Line Items]        
Warrants Issued 2,779,933us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember 		     
Gross Proceeds 5,261us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember 		     
Underwriting discount and offering expense 428ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesACommonStockWarrantsMember 		     
Series B Warrants [Member]        
Class of Warrant or Right [Line Items]        
Warrants Issued 670,269us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember 		     
Gross Proceeds 1,268us-gaap_ProceedsFromIssuanceOfWarrants
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember 		     
Underwriting discount and offering expense $ 103ogxi_WarrantIssuanceCosts
/ us-gaap_ClassOfWarrantOrRightAxis
= ogxi_SeriesBCommonStockWarrantsMember