Business and Nature of Operations - Additional Information (Details)	3 Months Ended
Mar. 31, 2021
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of incorporation	2004-04
Date of operating commencement	2016-02

Entity incorporation date of incorporation month and year.

No definition available.

Name:	urgn_EntityIncorporationDateOfIncorporationMonthAndYear
Namespace Prefix:	urgn_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration