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Commitments and Contingencies - Additional Information (Detail) $ in Billions | Dec. 31, 2019 USD ($)
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Development and Regulatory Milestone Payments |
Commitment And Contingencies [Line Items] |
Potential milestone payments | $ 4.9

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- Definition Commitment and contingencies. + References No definition available. + Details
Name: | nbix_CommitmentAndContingenciesLineItems
Namespace Prefix: | nbix_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of potential milestone payments to be paid under a license agreement. + References No definition available. + Details
Name: | nbix_PotentialMilestonePayments
Namespace Prefix: | nbix_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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