Quarterly report pursuant to Section 13 or 15(d)

Short-Term Notes Payable - Additional Information (Detail)

v2.4.1.9
Short-Term Notes Payable - Additional Information (Detail) (USD $)
 0 Months Ended
Mar. 10, 2014
Jul. 24, 2014
Mar. 16, 2015
Mar. 31, 2015
Dec. 31, 2014
Short-term Debt [Line Items]          
Short term notes payable for financing insurance policies       $ 79,390us-gaap_ShortTermNonBankLoansAndNotesPayable $ 64,840us-gaap_ShortTermNonBankLoansAndNotesPayable
Product Liability Insurance Financings One [Member] | Short Term Note Payable [Member]          
Short-term Debt [Line Items]          
Short-term note payable 50,694us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ogen_ProductLiabilityInsuranceFinancingsOneMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		       
Interest rate on short-term note 6.57%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ogen_ProductLiabilityInsuranceFinancingsOneMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		       
Debt instrument issuance date Apr. 10, 2014        
Short-term notes payable amortization period 10 months        
Final payment date of short-term note payable Jan. 10, 2015        
Directors And Officers Liability Insurance Financings [Member] | Short Term Note Payable [Member]          
Short-term Debt [Line Items]          
Short-term note payable   108,306us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ogen_DirectorsAndOfficersLiabilityInsuranceFinancingsMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		     
Interest rate on short-term note   4.647%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ogen_DirectorsAndOfficersLiabilityInsuranceFinancingsMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		     
Debt instrument issuance date   Aug. 24, 2014      
Short-term notes payable amortization period   11 months      
Final payment date of short-term note payable   Jun. 24, 2015      
Product Liability Insurance Financings Two [Member] | Short Term Note Payable [Member]          
Short-term Debt [Line Items]          
Short-term note payable     $ 49,395us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= ogen_ProductLiabilityInsuranceFinancingsTwoMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		   
Interest rate on short-term note     5.68%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= ogen_ProductLiabilityInsuranceFinancingsTwoMember
/ us-gaap_ShortTermDebtTypeAxis
= ogen_ShortTermNotePayableMember 		   
Debt instrument issuance date     Apr. 16, 2015    
Short-term notes payable amortization period     10 months    
Final payment date of short-term note payable     Jan. 16, 2016