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Subsequent Events (Details) - Voyager - Collaborative Arrangement - USD ($) $ in Millions	Jan. 08, 2023	Dec. 31, 2019
Subsequent Event [Line Items]
Upfront payments made		$ 165.0
Subsequent Event
Subsequent Event [Line Items]
Upfront payments made	$ 175.0
Equity investment to acquire the worldwide rights	$ 39.0

X

- Definition

Business Acquisition, Equity Investment To Acquire The Worldwide Rights

+ References

No definition available.

+ Details

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Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Upfront payments made under a collaboration agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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

X

- Details

Name:	srt_CounterpartyNameAxis=nbix_VoyagerTherapeuticsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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