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FAIR VALUE MEASUREMENTS (Schedule Of Changes In Level 3 Instruments Measured On A Recurring Basis Using Significant Unobservable Inputs) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
FAIR VALUE MEASUREMENTS [Abstract]    
Balance at beginning of year $ 12,431us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue $ 6,864us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Fair value of Exchange Option within the proceeds under the mAb Funding Agreement   4,756us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssues
Change in fair value of Exchange Option and embedded derivatives within research and development arrangement (269)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease 811us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPeriodIncreaseDecrease
Issuance of shares in respect to Termination and Equity Conversion Agreement (12,162)us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetSales  
Balance at end of year    12,431us-gaap_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetValue
Researhc and development component $ 421cgen_LiabilitiesArisingFromParticipationRights $ 758cgen_LiabilitiesArisingFromParticipationRights