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INCOME TAXES (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant components of deferred tax assets      
Net operating loss carryforwards $ 281,300,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards $ 271,800,000us-gaap_DeferredTaxAssetsOperatingLossCarryforwards  
Purchased technology   6,300,000us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets  
Research credits 23,400,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch 22,700,000us-gaap_DeferredTaxAssetsTaxCreditCarryforwardsResearch  
Capitalized research and development 2,100,000gern_DeferredTaxAssetsCapitalizedResearchAndDevelopment 6,600,000gern_DeferredTaxAssetsCapitalizedResearchAndDevelopment  
License fees 500,000gern_DeferredTaxAssetsCapitalizedLicenseFees 700,000gern_DeferredTaxAssetsCapitalizedLicenseFees  
Other - net 7,600,000us-gaap_DeferredTaxAssetsOther 10,100,000us-gaap_DeferredTaxAssetsOther  
Total deferred tax assets 314,900,000us-gaap_DeferredTaxAssetsGross 318,200,000us-gaap_DeferredTaxAssetsGross  
Valuation allowance for deferred tax assets (314,900,000)us-gaap_DeferredTaxAssetsValuationAllowance (318,200,000)us-gaap_DeferredTaxAssetsValuationAllowance  
Valuation allowance      
Increase (decrease) in valuation allowance (3,300,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount (5,500,000)us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount 14,200,000us-gaap_ValuationAllowanceDeferredTaxAssetChangeInAmount
Valuation allowance for deferred tax assets related to benefits of stock option deductions $ 4,900,000gern_DeferredTaxesValuationAllowanceStockOptionDeduction