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Debt (Schedule of 2019 and 2010 Notes) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Aug. 31, 2012
Jun. 30, 2010
Senior Subordinated Notes [Member] | Convertible Senior Subordinated Notes due August 15, 2019, 4.25% [Member]          
Debt Instrument [Line Items]          
Net carrying amount of the liability component $ 182,395,000us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
$ 165,296,000us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
     
Unamortized discount of the liability component 105,105,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
122,204,000us-gaap_UnamortizedDebtIssuanceExpense
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
     
Principal amount of the 2019 Notes 287,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
287,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
  287,500,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
 
Stated coupon interest 12,253,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
12,219,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
4,582,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Amortization of debt discount and debt issuance costs 17,804,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
16,201,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
5,726,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Total interest expense 30,057,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
28,420,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
10,308,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_ConvertibleSeniorSubordinatedNotesDueAugust152019425Member
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorSubordinatedNotesMember
   
Secured Convertible Notes Due June 2015 [Member] | Deerfield Financing [Member]          
Debt Instrument [Line Items]          
Net carrying amount of the liability component 104,000,000us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
114,000,000us-gaap_ConvertibleDebt
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
     
Principal amount of the 2019 Notes         124,000,000.0us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
Stated coupon interest 6,000,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
6,000,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
6,000,000exel_InterestExpenseCouponInterest
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
   
Amortization of debt discount and debt issuance costs 11,731,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
10,089,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
9,913,000us-gaap_AmortizationOfFinancingCostsAndDiscounts
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
   
Total interest expense $ 17,731,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
$ 16,089,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember
$ 15,913,000us-gaap_InterestExpenseDebt
/ us-gaap_DebtInstrumentAxis
= exel_DeerfieldFinancingMember
/ us-gaap_LongtermDebtTypeAxis
= exel_SecuredConvertibleNotesDueJuneTwoThousandAndFifteenMember