Merger - Contingent Value Rights Agreement (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Jul. 23, 2019
Merger Agreement
Percentage of gross consideration	80.00%
Contingent value rights term	15 years
Contingent value rights term incase of other than grant, sale or transfer	10 years
Commitment to support develop gemcabene	$ 1.0
License Agreement with Beijing SL
Merger Agreement
Upfront payment to be received	$ 2.5	$ 2.5

Percentage of gross consideration under the contingent value right agreement.

No definition available.

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Namespace Prefix:	nrbo_
Data Type:	num:percentItemType
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- Definition

The amount of commitment to support further development of gemcabene.

+ References

No definition available.

+ Details

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

- Definition

Represents the contingent value rights term.

+ References

No definition available.

+ Details

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

- Definition

Represents the contingent value rights term in case of other than a grant, sale or transfer of rights involving a sale or disposition of the post-Merger combined company.

+ References

No definition available.

+ Details

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- Definition

Amount of upfront payment to be received under the license agreement.

+ References

No definition available.

+ Details

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Namespace Prefix:	nrbo_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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

- Details

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Namespace Prefix:
Data Type:	na
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Period Type: