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Other Balance Sheet Details - Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Other Balance Sheet Details [Abstract]
Accrued employee related costs	$ 50.6	$ 38.2
Revenue-related reserves for discounts and allowances	62.7	34.6
Accrued development costs	32.4	32.9
Current branded prescription drug fee	28.6	23.6
Accounts payable and other accrued liabilities	51.5	39.4
Total accounts payable and accrued liabilities	$ 225.8	$ 168.7

X

- Definition

Accrued Branded Prescription Drug Fee

+ References

No definition available.

+ Details

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Balance Type:	credit
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X

- Definition

Accrued research and development expense current.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbix_
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X

- Definition

Other balance sheet details.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbix_
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Balance Type:	na
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X

- Definition

Revenue-related reserves for discounts and allowances.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbix_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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X

- Definition

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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X

- Definition

Amount of liabilities incurred to vendors for goods and services received, and accrued liabilities classified as other, payable within one year or the normal operating cycle, if longer.

+ References

No definition available.

+ Details

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X

- Definition

Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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