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Subsequent Event (Details) - Collaborative Arrangement with Invenra - Subsequent Event $ in Millions	May 02, 2018 USD ($)
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

X

- Definition

Eligible Payment From Collaboration For Development And Regulatory Milestone Achievement Under Collaborations Agreement

+ References

No definition available.

+ Details

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Period Type:	instant

X

- Definition

Upfront and milestone payments.

+ References

No definition available.

+ Details

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Namespace Prefix:	exel_
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Balance Type:	credit
Period Type:	duration

X

- 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

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X

- Details

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X

- Details

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Namespace Prefix:
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X

- Details

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Namespace Prefix:
Data Type:	na
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X

- Details

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X

- Details

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