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Collaboration Agreements (Bristol-Myers Squibb Collaboration) (Details) - Collaborative Arrangement, 2 BMS Compound Utilized [Member] [Member]	6 Months Ended
	Jun. 30, 2017
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Share in costs, percentage	33.33%
BMS [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Share in costs, percentage	66.67%

X

- Definition

Collaborative Arrangement, Share in Costs, Percentage

+ References

No definition available.

+ Details

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Namespace Prefix:	exel_
Data Type:	num:percentItemType
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Period Type:	duration

X

- 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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	dei_LegalEntityAxis=exel_BristolMyersSquibbMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: