Quarterly report pursuant to Section 13 or 15(d)

Warrants - Additional Information (Detail)

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Warrants - Additional Information (Detail) (USD $)
0 Months Ended 3 Months Ended 12 Months Ended
Mar. 23, 2015
Mar. 31, 2015
Dec. 31, 2014
Equity [Abstract]      
Shares underlying warrant outstanding 2,170,925ogen_ClassOfWarrantExpired 2,170,925ogen_ClassOfWarrantExpired 5,000ogen_ClassOfWarrantExpired
Warrants exercisable price per share $ 2.00ogen_ClassOfWarrantExpiredWeightedAverageExercisePrice $ 2.00ogen_ClassOfWarrantExpiredWeightedAverageExercisePrice $ 10.00ogen_ClassOfWarrantExpiredWeightedAverageExercisePrice