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Related Parties-Transactions and Balances - Additional Information (Details) - UroGen Pharma Inc.	1 Months Ended
	May 31, 2016	Nov. 30, 2015
Related Party Transaction [Line Items]
Lease agreement date		Nov. 30, 2015
Lease commencement date	May 31, 2016

X

- Definition

Lease agreement date.

+ References

No definition available.

+ Details

Name:	urgn_LeaseAgreementDate
Namespace Prefix:	urgn_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Lease commencement date.

+ References

No definition available.

+ Details

Name:	urgn_LeaseCommencementDate
Namespace Prefix:	urgn_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

X

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

X

- Details

Name:	us-gaap_ConsolidatedEntitiesAxis=us-gaap_SubsidiariesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: