XML 57 R40.htm IDEA: XBRL DOCUMENT
v3.19.1

Collaboration Agreements - Royalty Revenues under the Collaboration Agreement with GSK (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 29, 2019 | Mar. 30, 2018
Collaboration Agreement with GlaxoSmithKline |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Royalties accruing to GSK | $ 7,282 | $ 5,125
GSK | Collaborative Arrangement with Ipsen |  |
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items] |  |
Percent of royalty on net sale | 3.00% |

X
- Definition Percent of royalty on net sale. + References No definition available. + Details
Name: | exel_PercentOfRoyaltyOnNetSale
Namespace Prefix: | exel_
Data Type: | num:percentItemType
Balance Type: | na
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
Name: | us-gaap_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.3) -URI http://asc.fasb.org/extlink&oid=115205541&loc=SL114868664-224227 + Details
Name: | us-gaap_RoyaltyExpense
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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

X
- Details
Name: | srt_MajorCustomersAxis=exel_GlaxoSmithKlineMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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