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Collaboration Agreements (Invenra Collaboration, Narrative) (Details) - Collaborative Arrangement With Invenra $ in Millions | 12 Months Ended
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Jan. 01, 2021 USD ($)
Development and Regulatory Milestone |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement | $ 131.5
Additional Development and Regulatory Milestone |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Project initiation fee | 43.4
Product Commercialization |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement | 325.0
Discovery Project |
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items] |
Upfront and milestone 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
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Balance Type: | debit
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- Definition Project Initiation Fee Payment + References No definition available. + Details
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Namespace Prefix: | exel_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Upfront and milestone payments. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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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: |