Amount pertaining to milestone payment on collaborative arrangement.

No definition available.

Name:	nbrv_CollaborativeArrangementMilestonePaymentReceived
Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount pertaining to regulatory milestone payment on collaborative arrangement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Gross revenue from contract with customers excluding assessed tax.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	srt_CounterpartyNameAxis=nbrv_SinovantSciencesLtdMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=nbrv_MerckCoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=us-gaap_LicenseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=nbrv_LicenseInitialPaymentMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_CounterpartyNameAxis=nbrv_SunovionPharmaceuticsCanadaInc.Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=nbrv_ContingentConsiderationDeemedProbableToBeMetAndReceivedMember
Namespace Prefix:
Data Type:	na
Balance Type:
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- Details

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- Details

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Revenue (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	12 Months Ended
Revenue (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue
Revenue accounted for under Topic 606			$ 5,027	$ 9,481	$ 9,656
Product revenue, gross			500
Sinovant Sciences, LTD \| License Agreement
Revenue
Regulatory milestone payment received				500
Merck & Co \| License Agreement
Revenue
Regulatory milestone payment received			1,800
Collaboration revenue
Revenue
Revenue accounted for under Topic 606			2,756	6,210	6,500
Collaboration revenue - Upfront payment
Revenue
Revenue accounted for under Topic 606			108	1,538
Product revenue, gross			484	2,173
Collaboration revenue - Upfront payment \| License Agreement
Revenue
Revenue accounted for under Topic 606			1,000
Collaboration revenue - Upfront payment \| Sinovant Sciences, LTD \| License Agreement
Revenue
Revenue accounted for under Topic 606	$ 5,000	$ 1,000		1,000
Collaboration revenue - Upfront payment \| Sunovion Pharmaceutics Canada, Inc.
Revenue
Revenue accounted for under Topic 606	$ 1,000
Collaboration revenue - Variable consideration \| Sinovant Sciences, LTD \| License Agreement
Revenue
Milestone payment received				5,000
Research premium
Revenue
Revenue accounted for under Topic 606			1,227	1,311	2,594
Government grants
Revenue
Revenue accounted for under Topic 606			$ 936	$ 422	$ 562