The amount of end of term loan charge obligation to be paid by the company under the loan and security arrangement.

No definition available.

Name:	nbrv_DebtInstrumentEndOfTermLoanCharge
Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of end of term loan charge payments by the company under the loan and security arrangement.

+ References

No definition available.

+ Details

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

- Definition

The threshold amount of balance to be maintained by the company if actual net product revenues do no exceed a specified percentage of forecasted net product revenues over specified time periods under the debt agreement.

+ References

No definition available.

+ Details

Name:	nbrv_DebtInstrumentThresholdPerformanceCovenantAmount
Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the minimum liquidity requirement under the loan and security agreement.

+ References

No definition available.

+ Details

Name:	nbrv_LoanAndSecurityAgreementMinimumLiquidityRequirement
Namespace Prefix:	nbrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Represents the threshold percent of revised net product sales target achievement of which the minimum liquidity requirement does not apply.

+ References

No definition available.

+ Details

Name:	nbrv_LoanAndSecurityAgreementThresholdPercentageOfNetProductSaleMilestone
Namespace Prefix:	nbrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

Name:	us-gaap_DebtInstrumentFaceAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ 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(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585

+ Details

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

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

- Details

Name:	us-gaap_LongtermDebtTypeAxis=nbrv_TermLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=nbrv_LoanAndSecurityAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=nbrv_TrancheSevenAdvanceMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Subsequent Events (Details) - Term loan - Loan Agreement - USD ($)				1 Months Ended
	Apr. 03, 2020	Apr. 01, 2020	Mar. 11, 2020	Feb. 29, 2020	Dec. 31, 2018
Subsequent Event [Line Items]
Maximum borrowing capacity					$ 75,000,000
Subsequent Event
Subsequent Event [Line Items]
Repayment of debt	$ 30,000,000	$ 30,000,000
Aggregate principal amount of debt outstanding			$ 35,000,000
Percent of net product revenue sales target			70.00%	80.00%
Minimum liquidity requirement				$ 40,000,000
Minimum amount to be maintained in cash and cash equivalents			$ 3,000,000
End of term loan charge payment			2,300,000
End of term loan charge			300,000	$ 600,000
Tranche 7 Advance
Subsequent Event [Line Items]
Maximum borrowing capacity					$ 5,000,000
Tranche 7 Advance \| Subsequent Event
Subsequent Event [Line Items]
Maximum borrowing capacity			$ 5,000,000