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

X

- Definition

Annual Rent Escalation Percentage

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Lessee Operating Lease Monthly Base Rent Per Square Foot

+ References

No definition available.

+ Details

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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

- References

No definition available.

+ Details

Name:	us-gaap_LeasesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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 https://asc.fasb.org/extlink&oid=128292326&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 https://asc.fasb.org/extlink&oid=128292326&loc=SL77918673-209980

+ Details

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Balance Type:	na
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