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Commitments and Contingencies - Pfizer License Agreement (Details) $ in Thousands	1 Months Ended	9 Months Ended
	Mar. 31, 2015 USD ($)	Sep. 30, 2020 USD ($)
Commitments and Contingencies
Milestones or royalty payments triggered		$ 0
License Agreement
Commitments and Contingencies
Termination fee		$ 3,000
Pfizer, Inc. | License Agreement
Commitments and Contingencies
Number of years after the first commercial sale	P5Y
Notice period	90 days
Pfizer, Inc. | License Agreement | Milestone Payments | Maximum
Commitments and Contingencies
Potential payments upon achievement of certain milestones	37,000

X

- Definition

Represents a contingent liability to make payments if certain conditions are achieved.

+ References

No definition available.

+ Details

Name:	nrbo_ContingentLiability
Namespace Prefix:	nrbo_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of early termination fee payable on termination of license agreement.

+ References

No definition available.

+ Details

Name:	nrbo_LicenseAgreementEarlyTerminationFee
Namespace Prefix:	nrbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The period for which the entity inform for the termination of license agreement.

+ References

No definition available.

+ Details

Name:	nrbo_LicenseTerminationNoticePeriod
Namespace Prefix:	nrbo_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Refers to milestone or royalty payments triggered.

+ References

No definition available.

+ Details

Name:	nrbo_MilestonesOrRoyaltyPaymentsTriggered
Namespace Prefix:	nrbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Refers to number of years after the first sale occurs.

+ References

No definition available.

+ Details

Name:	nrbo_NumberOfYearsAfterFirstSaleOccurs
Namespace Prefix:	nrbo_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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_CollaborativeArrangementsAndNoncollaborativeArrangementTransactionsLineItems
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Data Type:	xbrli:stringItemType
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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

X

- Details

Name:	us-gaap_OtherCommitmentsAxis=nrbo_MilestonePaymentsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
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