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Stock Compensation Plan - Additional Information (Detail) (USD $)
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0 Months Ended |
12 Months Ended |
0 Months Ended |
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Nov. 27, 2013
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Oct. 18, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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May 30, 2014
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Dec. 31, 2012
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares awards out of common stock approved |
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4,000,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
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| Shares available for future stock option |
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1,501,673us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant
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| Shares issued under incentive plan |
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1,677,462ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedToDate
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| Outstanding stock options, a component of issuable shares |
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820,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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633,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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660,423us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber
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| Shares available for future issuance |
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2,322,538us-gaap_CommonStockCapitalSharesReservedForFutureIssuance
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| Expiration period |
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10 years
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| Shares withheld to cover tax payments |
113,636us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
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84,287us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
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0us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
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197,923us-gaap_SharesPaidForTaxWithholdingForShareBasedCompensation
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| Shares tax payments |
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$ 631,743us-gaap_PaymentsRelatedToTaxWithholdingForShareBasedCompensation
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| Stock awards to employees |
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0ogen_StockBasedAwardToEmployees
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| Unrecognized compensation costs |
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150,388us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptions
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| Weighted average period of stock options |
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1 year 3 months 18 days
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| Total grant date fair value of options vested |
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257,007us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
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166,512us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1
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| Common Stock issued |
502,654us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
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422,359us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
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| Executive Officer [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common Stock issued |
310,669us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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256,434us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Non Employee Director [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common Stock issued |
191,985us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorMember
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165,925us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorMember
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| 2012 Equity Incentive Plan [Member] | Non Employee Director [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total compensation cost |
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102,500us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorMember
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| Maximum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares vesting period |
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3 years
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| Minimum [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Shares vesting period |
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2 years
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| Stock Options [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Total compensation cost |
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$ 184,532us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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$ 191,202us-gaap_AllocatedShareBasedCompensationExpense
/ us-gaap_AwardTypeAxis
= us-gaap_EmployeeStockOptionMember
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| Long Term Performance Based Incentive Program [Member] | 2012 Equity Incentive Plan [Member] | Executive Officer [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common Stock issued |
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ogen_LongTermPerformanceBasedIncentiveProgramMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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567,103us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ogen_LongTermPerformanceBasedIncentiveProgramMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= us-gaap_ExecutiveOfficerMember
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| Long Term Performance Based Incentive Program [Member] | 2012 Equity Incentive Plan [Member] | Non Employee Director [Member] |
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |
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| Common Stock issued |
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0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ogen_LongTermPerformanceBasedIncentiveProgramMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorMember
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357,910us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardSharesIssuedInPeriod
/ us-gaap_AwardTypeAxis
= ogen_LongTermPerformanceBasedIncentiveProgramMember
/ us-gaap_PlanNameAxis
= ogen_TwoThousandTwelveEquityIncentivePlanMember
/ us-gaap_TitleOfIndividualAxis
= ogen_NonEmployeeDirectorMember
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