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Commitments and Contingencies - Additional Information (Detail) $ in Billions | 12 Months Ended
--- | ---
Dec. 31, 2018 USD ($)
Minimum |
Commitment And Contingencies [Line Items] |
Lease cancellation, notice period | 0 days
Maximum |
Commitment And Contingencies [Line Items] |
Lease cancellation, notice period | 180 days
Milestone payables | $ 1.0
Royalty, rate | 6.00%

X
- 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 Lease cancellation notice period. + References No definition available. + Details
Name: | nbix_LeaseCancellationNoticePeriod
Namespace Prefix: | nbix_
Data Type: | xbrli:durationItemType
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

X
- Definition Royalty rate percentage. + References No definition available. + Details
Name: | nbix_RoyaltyRatePercentage
Namespace Prefix: | nbix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |