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Subsequent Event (Details) - Collaborative Arrangement with Invenra - Subsequent Event $ in Millions | May 02, 2018 USD ($)
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Subsequent Event [Line Items] |
Upfront payments | $ 2.0
Development and Regulatory Milestone |
Subsequent Event [Line Items] |
Additional milestone achievement | 131.5
Product Commercialization |
Subsequent Event [Line Items] |
Additional milestone achievement | 325.0
Discovery Projects |
Subsequent Event [Line Items] |
Upfront payments | $ 2.0

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- Definition Eligible Payment From Collaboration For Development And Regulatory Milestone Achievement Under Collaborations Agreement + References No definition available. + Details
Name: | exel_EligiblePaymentFromCollaborationForDevelopmentAndRegulatoryMilestoneAchievementUnderCollaborationsAgreement
Namespace Prefix: | exel_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Upfront and milestone payments. + References No definition available. + Details
Name: | exel_UpfrontAndMilestonePayments
Namespace Prefix: | exel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
Name: | us-gaap_SubsequentEventLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | us-gaap_TypeOfArrangementAxis=exel_CollaborativeArrangementWithInvenraMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | exel_MilestoneObjectiveAxis=exel_DevelopmentAndRegulatoryMilestoneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | exel_MilestoneObjectiveAxis=exel_ProductCommercializationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | exel_MilestoneObjectiveAxis=exel_DiscoveryProjectMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |