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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
CONSOLIDATED STATEMENTS OF OPERATIONS
License fees and royalties	$ 1,153,000gern_LicensesAndRoyaltyRevenue	$ 1,283,000gern_LicensesAndRoyaltyRevenue	$ 2,709,000gern_LicensesAndRoyaltyRevenue
Operating expenses:
Research and development	20,707,000us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	23,155,000us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost	51,368,000us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Restructuring charges		1,462,000us-gaap_RestructuringCharges	2,702,000us-gaap_RestructuringCharges
General and administrative	16,758,000us-gaap_GeneralAndAdministrativeExpense	15,624,000us-gaap_GeneralAndAdministrativeExpense	20,397,000us-gaap_GeneralAndAdministrativeExpense
Total operating expenses	37,465,000us-gaap_OperatingExpenses	40,241,000us-gaap_OperatingExpenses	74,467,000us-gaap_OperatingExpenses
Loss from operations	(36,312,000)us-gaap_OperatingIncomeLoss	(38,958,000)us-gaap_OperatingIncomeLoss	(71,758,000)us-gaap_OperatingIncomeLoss
Unrealized gain (loss) on derivatives	351,000us-gaap_UnrealizedGainLossOnDerivatives	(316,000)us-gaap_UnrealizedGainLossOnDerivatives	13,000us-gaap_UnrealizedGainLossOnDerivatives
Interest and other income	373,000us-gaap_InterestAndOtherIncome	951,000us-gaap_InterestAndOtherIncome	3,097,000us-gaap_InterestAndOtherIncome
Interest and other expense	(82,000)us-gaap_OtherNonoperatingExpense	(56,000)us-gaap_OtherNonoperatingExpense	(233,000)us-gaap_OtherNonoperatingExpense
Net loss	$ (35,670,000)us-gaap_NetIncomeLoss	$ (38,379,000)us-gaap_NetIncomeLoss	$ (68,881,000)us-gaap_NetIncomeLoss
Basic and diluted net loss per share (in dollars per share)	$ (0.23)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.30)us-gaap_EarningsPerShareBasicAndDiluted	$ (0.54)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing basic and diluted net loss per share (in shares)	153,540,341us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	128,380,800us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted	126,941,024us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted

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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. Royalty revenue is derived from a percentage or stated amount of sales proceeds or revenue generated by the third party using the entity's property. Examples of property from which royalties may be derived include patents and oil and mineral rights.

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