Related Party Transactions - Statements of work (Details) - Dong-A $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2023 USD ($)	Jun. 30, 2023 USD ($)
Secondment of DongA Personnel, Sow 2
Related Party Transactions
SOW amount		$ 120
R&D expense	$ 30	30
Manufacture of DA-1241 and DA-1726
Related Party Transactions
SOW amount		780
R&D expense	780	780
Accounts payable/Accrued research and development	780	780
Preclinical and Research Overhead for DA-1241 and DA-1726
Related Party Transactions
SOW amount		1,231
R&D expense	707	1,033
Accounts payable/Accrued research and development	1,033	1,033
Secondment of DongA Personnel, Sow 5
Related Party Transactions
SOW amount		18
R&D expense	3	3
Accounts payable/Accrued research and development	3	3
Shared Services Agreement
Related Party Transactions
SOW amount		2,149
R&D expense	1,520	1,846
Accounts payable/Accrued research and development	$ 1,816	$ 1,816

Carrying amount as of the balance sheet date of obligations incurred for research and development, due to related parties.

No definition available.

+ Details

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

- Definition

Amount of research and development expenses resulting from transactions, excluding transactions that are eliminated in consolidated or combined financial statements, with related party.

+ References

No definition available.

+ Details

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

- Definition

Amount of transactions with related party during the financial reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 850
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-1

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483326/850-10-50-3

+ Details

Name:	us-gaap_RelatedPartyTransactionAmountsOfTransaction
Namespace Prefix:	us-gaap_
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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(c)(2)(ii))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 946
-SubTopic 220
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.6-07(2)(g)(3))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483575/946-220-S99-1

+ Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nrbo_SecondmentOfDongaPersonnelSow2Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nrbo_ManufactureOfDa1241AndDa1726Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nrbo_PreclinicalAndResearchOverheadForDa1241AndDa1726Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nrbo_SecondmentOfDongaPersonnelSow5Member
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionAxis=nrbo_SharedServicesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: