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Income Taxes (Schedule Of Reconciliation Of Income Taxes At The Statutory Federal Income Tax Rate To Net Income Taxes) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Income Tax Disclosure [Abstract]      
U.S. federal income tax (benefit) provision at statutory rate $ (91,366)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (83,251)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate $ (50,163)us-gaap_IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
Unutilized net operating losses 87,448exel_IncomeTaxReconciliationUnutilizedNetOperatingLosses (3,438)exel_IncomeTaxReconciliationUnutilizedNetOperatingLosses 46,324exel_IncomeTaxReconciliationUnutilizedNetOperatingLosses
Non-deductible interest 3,598us-gaap_IncomeTaxReconciliationNondeductibleExpense 3,380us-gaap_IncomeTaxReconciliationNondeductibleExpense 3,297us-gaap_IncomeTaxReconciliationNondeductibleExpense
Stock-based compensation 255us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 393us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost 504us-gaap_IncomeTaxReconciliationNondeductibleExpenseShareBasedCompensationCost
State tax expense (182)us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 10us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes 74us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Refundable tax credit 0us-gaap_IncomeTaxReconciliationTaxCredits 0us-gaap_IncomeTaxReconciliationTaxCredits 32us-gaap_IncomeTaxReconciliationTaxCredits
Available-for-sale investments 0exel_EffectiveIncomeTaxRateReconciliationDeductionAFSSecurities (106)exel_EffectiveIncomeTaxRateReconciliationDeductionAFSSecurities 0exel_EffectiveIncomeTaxRateReconciliationDeductionAFSSecurities
Impact of intellectual property rights transfer 0exel_EffectiveIncomeTaxRateReconciliationDeductionIPTransfer 82,858exel_EffectiveIncomeTaxRateReconciliationDeductionIPTransfer 0exel_EffectiveIncomeTaxRateReconciliationDeductionIPTransfer
Other 65us-gaap_IncomeTaxReconciliationOtherAdjustments 58us-gaap_IncomeTaxReconciliationOtherAdjustments 39us-gaap_IncomeTaxReconciliationOtherAdjustments
Income tax (benefit) provision $ (182)us-gaap_IncomeTaxExpenseBenefit $ (96)us-gaap_IncomeTaxExpenseBenefit $ 107us-gaap_IncomeTaxExpenseBenefit