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Note 9 - Prepaid Forward Obligation (Details Textual) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended |
--- | --- | --- | ---
May 31, 2021 | Mar. 31, 2021 | Mar. 31, 2026 | Dec. 31, 2025
Prepaid Forward Obligation, Current |  |  | $ 3.6 | $ 3.4
RTW Investments [Member] |  |  |  |
Proceeds from Prepaid Forward Obligation | $ 75.0 | $ 75.0 |  |
Proceeds from Prepaid Forward Arrangement, Net | $ 72.4 | $ 72.4 |  |
Prepaid Forward Agreement, Minimum Future Cash Flows |  |  | $ 200.0 |
Prepaid Forward Agreement, Minimum Future Cash Flows, Rate (Rate) |  |  | 13.00% |
Prepaid Forward Agreement, Cumulative Amount Paid and Payable |  |  | $ 51.0 |
RTW Investments [Member] | Sales of Up to $200 Million [Member] | Jelmyto [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 9.50% |  |
Prepaid Forward Agreement, Minimum Future Cash Flows |  | $ 200.0 |  |
Prepaid Forward Agreement, Future Cash Flows, Increase in Percentage of Net Sales |  | 3.50% |  |
RTW Investments [Member] | Sales Between $200 Million and $300 Million [Member] | Jelmyto [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 3.00% |  |
RTW Investments [Member] | Sales Over $300 Million [Member] | Jelmyto [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 1.00% |  |
RTW Investments [Member] | Sales Up to $200 Million with FDA Approval [Member] | UGN-102 [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 2.50% |  |
RTW Investments [Member] | Sales Between $200 Million and $300 Million with FDA Approval [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 1.00% |  |
RTW Investments [Member] | Sales Over $300 Million with FDA Approval [Member] |  |  |  |
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales |  | 0.50% |  |

X
- Definition Represents the cumulative amount paid and payable for a prepaid forward agreement. + References No definition available. + Details
Name: | urgn_PrepaidForwardAgreementCumulativeAmountPaidAndPayable
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The increase in percentage of net sales for future cash flows under the prepaid forward agreement. + References No definition available. + Details
Name: | urgn_PrepaidForwardAgreementFutureCashFlowsIncreaseInPercentageOfNetSales
Namespace Prefix: | urgn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The percentage of net sales for future cash payments under the prepaid forward agreement. + References No definition available. + Details
Name: | urgn_PrepaidForwardAgreementFutureCashPaymentsPercentageOfNetSales
Namespace Prefix: | urgn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The minimum amount of future cash flows under the prepaid forward agreement. + References No definition available. + Details
Name: | urgn_PrepaidForwardAgreementMinimumFutureCashFlows
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Represents the rate related to minimum future cash flow. + References No definition available. + Details
Name: | urgn_PrepaidForwardAgreementMinimumFutureCashFlowsRate
Namespace Prefix: | urgn_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

X
- Definition Current amount of the prepaid forward obligation as of the balance sheet date. + References No definition available. + Details
Name: | urgn_PrepaidForwardObligationCurrent
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of cash inflow from prepaid forward arrangement, net of transaction costs. + References No definition available. + Details
Name: | urgn_ProceedsFromPrepaidForwardArrangementNet
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of cash inflow for prepaid forward obligation. + References No definition available. + Details
Name: | urgn_ProceedsFromPrepaidForwardObligation
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | srt_CounterpartyNameAxis=urgn_RTWInvestmentsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=urgn_SalesOfUpTo200MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_ProductOrServiceAxis=urgn_JelmytoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=urgn_SalesBetween200MillionAnd300MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=urgn_SalesOver300MillionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=urgn_SalesUpTo200MillionWithFDAApprovalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_ProductOrServiceAxis=urgn_UGN102Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_StatementScenarioAxis=urgn_SalesBetween200MillionAnd300MillionWithFDAApprovalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_StatementScenarioAxis=urgn_SalesOver300MillionWithFDAApprovalMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |