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Subsequent Events (Details) - Head Quarters in Boston Lease - USD ($) $ in Thousands		1 Months Ended
	Nov. 11, 2020	Sep. 30, 2019
Subsequent Event [Line Items]
Term of contract	6 months	1 year
Monthly rental cost	$ 3	$ 21
Rent concessions granted by the landlord	$ 1	$ 32

X

- Definition

The amount of monthly operating lease cost.

+ References

No definition available.

+ Details

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

X

- Definition

This item represents the deferred credit for an incentive or inducement received by a lessee from a lessor, in order to motivate the lessee to enter the operating lease agreement, which incentive or inducement is to be recognized as a reduction of rental expense over the lease term.

+ References

No definition available.

+ Details

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

X

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918673-209980

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=nrbo_HeadquartersInBostonLeaseMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: