Annual report pursuant to Section 13 and 15(d)

Licenses and Exclusive Channel Collaboration Agreements - Additional Information (Detail)

v2.4.1.9
Licenses and Exclusive Channel Collaboration Agreements - Additional Information (Detail) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
MU1140 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Minimum annual amount to Texas A&M $ 32,467us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_MuOneOneFourZeroMember
$ 41,953us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_MuOneOneFourZeroMember
License agreement, original date Jun. 22, 2000  
License agreement, first amendment date Sep. 15, 2000  
License agreement, second amendment date Jul. 10, 2002  
License agreement, third amendment date Sep. 25, 2002  
License agreement, fourth amendment date Mar. 17, 2003  
License agreement, fifth amendment date Apr. 19, 2013  
Patents license expiration period 2017 through 2019  
Smart Replacement Therapy [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Minimum annual amount to Texas A&M 10,000us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_SmartReplacementTherapyMember
49,575us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_SmartReplacementTherapyMember
License agreement, original date Aug. 04, 1998  
License agreement, first amendment date Sep. 15, 2000  
License agreement, second amendment date Jul. 10, 2002  
License agreement, third amendment date Sep. 25, 2002  
License agreement, fourth amendment date Mar. 17, 2003  
License agreement, fifth amendment date Apr. 19, 2013  
Shares issued as partial consideration 29,997ogen_SharesIssuedInPreviousYearsUnderLicensingAgreement
/ us-gaap_TypeOfArrangementAxis
= ogen_SmartReplacementTherapyMember
 
Patent right filling date Jun. 07, 1995  
Patent effective date Mar. 04, 1997  
Patent right expire date Jun. 07, 2015  
Texas A and M University [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Minimum annual amount to Texas A&M $ 0us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_TexasAAndMUniversityMember
$ 0us-gaap_LicenseCosts
/ us-gaap_TypeOfArrangementAxis
= ogen_TexasAAndMUniversityMember
Number of patent application filed 2ogen_NumberOfPatentApplicationsFiled
/ us-gaap_TypeOfArrangementAxis
= ogen_TexasAAndMUniversityMember