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Subsequent Events (Details) - Subsequent Event	Feb. 08, 2022 USD ($) renewalOption
Subsequent Event [Line Items]
Operating lease term	13 years 7 months 6 days
Monthly base rent per square foot | $	$ 6
Annual rent escalation percentage	3.00%
Rent abatement period	10 months
Number of lease renewal options | renewalOption	2
Lease renewal term	5 years
Lessee option term for construction of fifth building	6 years

X

- Definition

AnnualRentEscalationPercentage

+ References

No definition available.

+ Details

Name:	nbix_AnnualRentEscalationPercentage
Namespace Prefix:	nbix_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Lessee Operating Lease Monthly Base Rent Per Square Foot

+ References

No definition available.

+ Details

Name:	nbix_LesseeOperatingLeaseMonthlyBaseRentPerSquareFoot
Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Description of term of lessee's option for the construction of a fifth building under operating lease.

+ References

No definition available.

+ Details

Name:	nbix_LesseeOperatingLeaseOptionTermToConstructFifthBuilding
Namespace Prefix:	nbix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The number of renewal options under the terms of the lease.

+ References

No definition available.

+ Details

Name:	nbix_NumberOfRenewalOptions
Namespace Prefix:	nbix_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Rent Abatement Period

+ References

No definition available.

+ Details

Name:	nbix_RentAbatementPeriod
Namespace Prefix:	nbix_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseRenewalTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
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

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

X

- Details

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