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LICENSE AGREEMENTS (Details 2) (License agreements, USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
GE Healthcare UK Limited
LICENSE AGREEMENTS
License fee revenue	$ 0us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = us-gaap_CollaborativeArrangementMember / us-gaap_TypeOfArrangementAxis = gern_GEHealthcareUKLimitedMember	$ 825,000us-gaap_LicensesRevenue / us-gaap_CounterpartyNameAxis = us-gaap_CollaborativeArrangementMember / us-gaap_TypeOfArrangementAxis = gern_GEHealthcareUKLimitedMember
TA Sciences
LICENSE AGREEMENTS
Non-refundable upfront payment recognized in other income		$ 2,500,000us-gaap_OtherIncome / us-gaap_CounterpartyNameAxis = us-gaap_CollaborativeArrangementMember / us-gaap_TypeOfArrangementAxis = gern_TelomeraseActivationSciencesIncMember

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Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

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