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Stock-based Compensation - Additional Information (Detail) (USD $)
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3 Months Ended |
0 Months Ended |
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Mar. 31, 2015
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Mar. 31, 2014
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Mar. 16, 2015
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Stock option awards |
900,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
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| Weighted-average grant date fair value |
$ 1.30us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageGrantDateFairValue
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| Stock options vested |
6,667us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedNumberOfShares
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| Stock options forfeited |
80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod
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| Number of stock options, exercised |
0us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised
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| Non- employee Directors [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Annual retainer amount for the threshold of stock precluded from selling |
$ 270,000ogen_MinimumDollarValueStockOwnershipHoldingRequirementThreshold
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorsMember
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| 2012 Equity Incentive Plan [Member] | Chief Financial Officer [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Stock option awards |
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200,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember
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| Exercise price of plan |
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$ 1.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ChiefFinancialOfficerMember
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| Vesting period |
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3 years
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| 2012 Equity Incentive Plan [Member] | Non- employee Directors [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Stock option awards |
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80,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorsMember
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| 2012 Equity Incentive Plan [Member] | Non- employee Directors [Member] | Restricted Stock [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Exercise price of plan |
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$ 1.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorsMember
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| Restricted shares awarded |
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40,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorsMember
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| Restricted shares ending date |
Under the Company's 2012 Plan of which 10,000 restricted shares will vest at the end of each calendar quarter in 2015 provided the recipient remains a director through the vesting date.
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| Restricted shares vest in each quarter end |
10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorsMember
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| Operations Or Product Development [Member] | 2012 Equity Incentive Plan [Member] | Senior Vice President [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Stock option awards |
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150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_ProductOrServiceAxis
= ogen_OperationsOrProductDevelopmentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
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| Exercise price of plan |
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$ 1.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_ProductOrServiceAxis
= ogen_OperationsOrProductDevelopmentMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
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| Vesting period |
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3 years
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| Discovery Research [Member] | 2012 Equity Incentive Plan [Member] | Senior Vice President [Member] |
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| Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
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| Stock option awards |
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150,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_ProductOrServiceAxis
= ogen_DiscoveryResearchMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
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| Exercise price of plan |
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$ 1.32us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_ProductOrServiceAxis
= ogen_DiscoveryResearchMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_VicePresidentMember
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| Vesting period |
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3 years
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