Share-Based Payments - Employee Stock Purchase Plan (Details) - Employee Stock Purchase Plan - USD ($) $ in Millions	1 Months Ended	9 Months Ended
Aug. 31, 2018	Sep. 30, 2019
Share-Based Payments
Maximum number of shares authorized under plan (in shares)	500,000
ESPP Share Pool as a percentage of total number of ordinary shares outstanding		0.60%
Purchase discount as a percentage of current market price		15.00%
Share-based compensation expense		$ 0.1

Represents the discount percentage of shares under Employee Stock Purchase Plan for eligible employees.

No definition available.

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents percentage of ESPP share pool represented of the total number of common shares outstanding.

+ References

No definition available.

+ Details

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- Definition

Represents the total maximum aggregate number of shares authorized under Employee Stock Purchase Plan.

+ References

No definition available.

+ Details

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Namespace Prefix:	nbrv_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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- Details

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