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Stock Compensation Plan - Summary of Stock Option Activity (Detail) (USD $)
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12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Number of Options, Outstanding, beginning balance | 633,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 660,423us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Number of Options, Forfeited | (70,475)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (56,050)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod |
| Number of Options, Granted | 257,500us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross | 61,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |
| Number of Options, Exercised | (31,533)us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | |
| Number of Options, Outstanding, ending balance | 820,865us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 633,840us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Number of Options, Exercisable | 583,882us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | |
| Weighted Average Exercise Price, Outstanding, beginning balance | $ 4.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 4.70us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Weighted Average Exercise Price, Forfeited | $ 2.93us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 2.19us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice |
| Weighted Average Exercise Price, Granted | $ 1.65us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice | $ 3.13us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice |
| Weighted Average Exercise Price, Exercised | $ 1.26us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | |
| Weighted Average Exercise Price, Outstanding, ending balance | $ 4.03us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 4.88us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Weighted Average Exercise Price, Exercisable | $ 5.02us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice | |
| Minimum [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Option Price Per Share, beginning balance |
$ 1.20ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
$ 1.20ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Option Price Per Share, forfeited |
$ 1.50ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
$ 1.20ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Option Price Per Share, granted |
$ 0.86ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
$ 2.75ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Option Price Per Share, exercised |
$ 1.20ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Option Price Per Share, ending balance |
$ 0.86ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
$ 1.20ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MinimumMember |
| Option Price Per Share, exercisable |
$ 1.20ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisableOptionPricePerShare / us-gaap_RangeAxis = us-gaap_MinimumMember |
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| Maximum [Member] | ||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||
| Option Price Per Share, beginning balance |
$ 17.00ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
$ 17.00ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Option Price Per Share, forfeited |
$ 4.00ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
$ 5.40ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Option Price Per Share, granted |
$ 2.84ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
$ 3.55ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Option Price Per Share, exercised |
$ 1.50ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
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| Option Price Per Share, ending balance |
$ 17.00ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
$ 17.00ogen_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingExercisePrice / us-gaap_RangeAxis = us-gaap_MaximumMember |
| Option Price Per Share, exercisable |
$ 17.00ogen_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisableOptionPricePerShare / us-gaap_RangeAxis = us-gaap_MaximumMember |
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- Definition
Share based compensation arrangement by share based payment award options outstanding exercise price. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options exercisable option price per share. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options exercises in period exercise price. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options forfeitures in period exercise price. No definition available.
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- Definition
Share based compensation arrangements by share based payment award options grants in period exercise price. No definition available.
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- Details
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| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Gross number of share options (or share units) granted during the period. No definition available.
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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- Definition
Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. No definition available.
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- Definition
Number of share options (or share units) exercised during the current period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Details
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