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Defined Contribution Plan (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021
Defined Contribution Plan Disclosure [Line Items] |  |
Minimum age of employee to cover under the plan | 21 years |
Employer matches vesting period | 6 years |
Percentage of employee contribution vested on their contribution | 100.00% |
Amount of discretionary matching contributions on employee deferrals | $ 0.0 | $ 0.0
Maximum |  |
Defined Contribution Plan Disclosure [Line Items] |  |
Employee compensation deferred percentage | 90.00% |

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- Definition Percentage of employee contributions may be deferred to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | nrbo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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- Definition Employee eligibility age criteria under defined contribution plan. + References No definition available. + Details
Name: | nrbo_DefinedContributionPlanEmployeeEligibilityAge
Namespace Prefix: | nrbo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Period which the employer contribution will be vested under defined contribution plan, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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Namespace Prefix: | nrbo_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Percentage of employee contribution vested on contribution made by employee. + References No definition available. + Details
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Namespace Prefix: | nrbo_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

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

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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |