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CONDENSED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Revenues:    
License fees and royalties $ 537gern_LicensesAndRoyaltyRevenue $ 474gern_LicensesAndRoyaltyRevenue
Operating expenses:    
Research and development 4,987us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost 5,211us-gaap_ResearchAndDevelopmentExpenseExcludingAcquiredInProcessCost
Restructuring charges 406us-gaap_RestructuringCharges  
General and administrative 4,600us-gaap_GeneralAndAdministrativeExpense 3,994us-gaap_GeneralAndAdministrativeExpense
Total operating expenses 9,993us-gaap_OperatingExpenses 9,205us-gaap_OperatingExpenses
Loss from operations (9,456)us-gaap_OperatingIncomeLoss (8,731)us-gaap_OperatingIncomeLoss
Unrealized gain on derivatives 16us-gaap_UnrealizedGainLossOnDerivatives 224us-gaap_UnrealizedGainLossOnDerivatives
Interest and other income 149us-gaap_InterestAndOtherIncome 83us-gaap_InterestAndOtherIncome
Interest and other expense (24)us-gaap_OtherNonoperatingExpense (16)us-gaap_OtherNonoperatingExpense
Net loss $ (9,315)us-gaap_NetIncomeLoss $ (8,440)us-gaap_NetIncomeLoss
Basic and diluted net loss per share (in dollars per share) $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted $ (0.06)us-gaap_EarningsPerShareBasicAndDiluted
Shares used in computing basic and diluted net loss per share (in shares) 157,547,568us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted 143,465,818us-gaap_WeightedAverageNumberOfShareOutstandingBasicAndDiluted