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

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- 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: |