Summary of Significant Accounting Policies - Income Taxes (Details)	12 Months Ended	24 Months Ended
Dec. 31, 2017	Dec. 31, 2019
U.S.
Income taxes
U.S. federal corporate tax rate	35.00%	21.00%

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.

No definition available.

Name:	nbrv_DisclosureOfIncomeTaxesLineItems
Namespace Prefix:	nbrv_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration