XML 51 R38.htm IDEA: XBRL DOCUMENT
v3.8.0.1

Real Estate - Additional Information (Detail) ft² in Thousands, $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2007 USD ($) Building | Sep. 30, 2017 USD ($) RenewalOptions | Jun. 30, 2017 USD ($) | Sep. 30, 2016 USD ($) | Mar. 31, 2016 USD ($) | Sep. 30, 2017 USD ($) ft² RenewalOptions Lease_Agreements | Sep. 30, 2016 USD ($) | Dec. 31, 2008 USD ($)
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Sale of facility and associated real property | $ 109.0 |  |  |  |  |  |  |
Mortgage debt retired | 47.7 |  |  |  |  |  |  |
Cash received net of transaction costs and debt retirement | $ 61.0 |  |  |  |  |  |  |
Leaseback transaction lease period | 12 years |  |  |  |  |  |  |
Number of building leased | Building | 2 |  |  |  |  |  |  |
Net deferred gain on real estate sale |  | $ 9.0 |  |  |  | $ 9.0 |  | $ 39.1
Deferred gain recognized on real estate sale |  | 0.2 |  | $ 0.9 |  | $ 2.0 | $ 2.6 |
Lease expiration year |  |  |  |  |  | 2029 |  |
Lease security deposit |  | 4.7 |  |  |  | $ 4.7 |  |
Letter of credit |  | $ 3.0 |  |  |  | $ 3.0 |  |
Percentage of management fee included in the base annual rent |  |  |  |  |  | 3.50% |  |
Lease extension period |  |  |  |  |  | 10 years |  |
Number of times to renew the lease contract | RenewalOptions |  | 2 |  |  |  | 2 |  |
Subleased area | ft² |  |  |  |  |  | 16 |  |
Rental income from sublease agreement |  |  |  |  |  | $ 0.6 |  |
Amended Lease Term [Member] |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  |  | Dec. 31, 2029 |  |
Percentage reduction in base rental |  |  |  |  |  | 8.00% |  |
Tenant improvement allowances |  | $ 13.1 |  |  |  | $ 13.1 |  |
Lease security deposit |  | $ 3.0 |  |  |  | $ 3.0 |  |
Sublease |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Number of sublease agreements | Lease_Agreements |  |  |  |  |  | 1 |  |
Reversal of cease use expense |  |  | $ 0.5 |  | $ 0.8 |  |  |
Second Sublease |  |  |  |  |  |  |  |
Real Estate Properties [Line Items] |  |  |  |  |  |  |  |
Lease expiration date |  |  |  |  |  | 2018-03 |  |

X
- Definition The percentage decrease in the cost of the rental rates under the terms of the lease + References No definition available. + Details
Name: | nbix_BaseRentalReductionPercentage
Namespace Prefix: | nbix_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of expense (reversal of expense) in connection with exit or disposal activity (including executory costs such as maintenance charges) net of estimated income from potential subleasing. + References No definition available. + Details
Name: | nbix_CeaseUseExpenseReversalOfExpense
Namespace Prefix: | nbix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The date of expiration of the sublease agreement between the entity and a third party, in CCYY-MM format. + References No definition available. + Details
Name: | nbix_LeaseExpirationMonthAndYear
Namespace Prefix: | nbix_
Data Type: | xbrli:gYearMonthItemType
Balance Type: | na
Period Type: | duration

X
- Definition The year of expiration of the initial lease term. + References No definition available. + Details
Name: | nbix_LeaseExpirationYear
Namespace Prefix: | nbix_
Data Type: | xbrli:gYearItemType
Balance Type: | na
Period Type: | duration

X
- Definition Lease Extension Period + References No definition available. + Details
Name: | nbix_LeaseExtensionPeriod
Namespace Prefix: | nbix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Letter of credit issued by the bank in lieu of a cash security deposit under the terms of a lease, secured by a deposit of equal amount with that bank. + References No definition available. + Details
Name: | nbix_LettersOfCreditCollateral
Namespace Prefix: | nbix_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number Of Buildings Leased + References No definition available. + Details
Name: | nbix_NumberOfBuildingsLeased
Namespace Prefix: | nbix_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition The number of sublease agreements related to real estate properties. + References No definition available. + Details
Name: | nbix_NumberOfLeaseAgreements
Namespace Prefix: | nbix_
Data Type: | xbrli:integerItemType
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 The term whereby the Company leased back the property in a sale leaseback transaction involving the sale of the property to another party and the lease of the property back to the Company, in PnY format. + References No definition available. + Details
Name: | nbix_SaleLeasebackTransactionLeasePeriod
Namespace Prefix: | nbix_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition The total area (square footage) of the subleased property. + References No definition available. + Details
Name: | nbix_SubleasedAgreementArea
Namespace Prefix: | nbix_
Data Type: | num:areaItemType
Balance Type: | na
Period Type: | duration

X
- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
Name: | us-gaap_LeaseExpirationDate1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:dateItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of mortgage loans on real estate that were sold during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 10 -Section S99 -Paragraph 6 -Subparagraph (SX 210.5-04.(c) Schedule IV) -URI http://asc.fasb.org/extlink&oid=27047687&loc=d3e5864-122674 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 310 -Section S99 -Paragraph 1 -Subparagraph (SX 210.12-29.6) -URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014 + Details
Name: | us-gaap_MortgageLoansOnRealEstateCostOfMortgagesSold
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The total amount of sublease rental income recognized during the period that reduces the entity's rent expense incurred under operating leases. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 + Details
Name: | us-gaap_OperatingLeasesRentExpenseSubleaseRentals1
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The percentage charged for managing real estate properties. + References No definition available. + Details
Name: | us-gaap_PropertyManagementFeePercentFee
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_RealEstatePropertiesLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The portion of the deferred gain that was recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907795&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionCurrentPeriodGainRecognized
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The portion of the gain that will be recorded as income or a reduction in rent expense in future periods less amounts recognized in the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77907795&loc=d3e50609-112754 + Details
Name: | us-gaap_SaleLeasebackTransactionDeferredGainNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of cash inflow before closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 + Details
Name: | us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Amount of cash inflow after closing and debt issuance costs received by a seller-lessee in a sale-leaseback recognized in financing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=82846721&loc=d3e51843-112757 + Details
Name: | us-gaap_SaleLeasebackTransactionNetProceedsFinancingActivities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of an asset, typically cash, provided to a counterparty to provide certain assurance of performance by the entity pursuant to the terms of a written or oral agreement, such as a lease. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.8,17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
Name: | us-gaap_SecurityDeposit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Carrying amount as of the balance sheet date of improvements having a life longer than one year that were made for the benefit of one or more tenants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.1(f)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
Name: | us-gaap_TenantImprovements
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_LeaseArrangementTypeAxis=nbix_AmendedLeaseTermMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=nbix_SubleaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_OtherCommitmentsAxis=nbix_SecondSubleaseMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |