XML 52 R38.htm IDEA: XBRL DOCUMENT v3.22.4

Debt Securities - Amortized Cost, Gross Unrealized Gains and Losses, Allowance for Credit Losses and Fair Value of Debt Securities Available-For-Sale (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	$ 735.8	$ 370.6
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(9.4)	(0.1)
Fair value, current	726.4	370.5
Amortized cost, noncurrent	304.5	563.2
Unrealized gain, noncurrent	0.2	0.0
Unrealized loss, noncurrent	(5.3)	(2.5)
Fair value, noncurrent	299.4	560.7
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	156.2	204.8
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(0.2)	0.0
Fair value, current	156.0	204.8
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	296.2	128.2
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(3.2)	(0.1)
Fair value, current	293.0	128.1
Amortized cost, noncurrent	259.5	358.9
Unrealized gain, noncurrent	0.2	0.0
Unrealized loss, noncurrent	(4.3)	(1.5)
Fair value, noncurrent	255.4	357.4
Securities of government-sponsored entities
Debt Securities, Available-for-sale [Line Items]
Amortized cost, current	283.4	37.6
Unrealized gain, current	0.0	0.0
Unrealized loss, current	(6.0)	0.0
Fair value, current	277.4	37.6
Amortized cost, noncurrent	45.0	204.3
Unrealized gain, noncurrent	0.0	0.0
Unrealized loss, noncurrent	(1.0)	(1.0)
Fair value, noncurrent	$ 44.0	$ 203.3

X

- Definition

Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Current

+ References

No definition available.

+ Details

Name:	nbix_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxCurrent
Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Available For Sale Debt Securities Accumulated Gross Unrealized Gain Before Tax Noncurrent

+ References

No definition available.

+ Details

Name:	nbix_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTaxNoncurrent
Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Current

+ References

No definition available.

+ Details

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

X

- Definition

Available For Sale Debt Securities Accumulated Gross Unrealized Loss Before Tax Noncurrent

+ References

No definition available.

+ Details

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

X

- Definition

Debt Securities, Available-for-Sale, Fair Value, Current

+ References

No definition available.

+ Details

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

X

- Definition

Debt Securities, Available-for-Sale, Fair Value, Noncurrent

+ References

No definition available.

+ Details

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

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as current.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), classified as noncurrent.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 45
-Paragraph 1
-URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

+ Details

Name:	us-gaap_DebtSecuritiesAvailableForSaleAmortizedCostNoncurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: