Quarterly report pursuant to Section 13 or 15(d)

Excess Lease Liability - Additional Information (Detail)

v2.4.1.9
Excess Lease Liability - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended
Feb. 28, 2015
Operating Leased Assets [Line Items]  
Lease termination agreement, additional fee payable 1.3ogxi_AdditionalContingentLiabilityEarlyTerminationOfLeaseAgreement
BMR-217TH Place LLC  
Operating Leased Assets [Line Items]  
Lease termination agreement, date of termination Mar. 01, 2015
BMR-217TH Place LLC | Termination Fee [Member]  
Operating Leased Assets [Line Items]  
Lease termination agreement, fee paid 2.0us-gaap_LossOnContractTermination
/ us-gaap_CounterpartyNameAxis
= ogxi_BMR217THPlaceLLCMember
/ us-gaap_LeaseArrangementTypeAxis
= ogxi_TerminationFeeMember
Minimum | BMR-217TH Place LLC  
Operating Leased Assets [Line Items]  
Amount of funding to raise that would trigger payment of additional termination fee 20.0ogxi_AmountOfFundingToRaiseThatWouldTriggerPaymentOfAdditionalTerminationFee
/ us-gaap_CounterpartyNameAxis
= ogxi_BMR217THPlaceLLCMember
/ us-gaap_RangeAxis
= us-gaap_MinimumMember