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Note 13 - License and Collaboration Agreements (Details Textual) - MD Anderson [Member] - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jan. 31, 2021	Jun. 30, 2023
Collaboration Agreement, Term (Year)	3 years
Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross		$ 2

X

- Definition

The term of the collaboration agreement.

+ References

No definition available.

+ Details

Name:	urgn_CollaborationAgreementTerm
Namespace Prefix:	urgn_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The amount of costs incurred under a research and development arrangement accounted for as a contract to perform research and development for others.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 730
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483041/730-20-50-1

+ Details

Name:	us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

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