Represents the cumulative amount paid and payable for a prepaid forward agreement.

No definition available.

Name:	urgn_PrepaidForwardAgreementCumulativeAmountPaidAndPayable
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- 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

- 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

- 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

- 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

- 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

- 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

- 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

- Details

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

- Details

Name:	srt_StatementScenarioAxis=urgn_SalesOfUpTo200MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_ProductOrServiceAxis=urgn_JelmytoMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=urgn_SalesBetween200MillionAnd300MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=urgn_SalesOver300MillionMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_StatementScenarioAxis=urgn_SalesUpTo200MillionWithFDAApprovalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

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

- Details

Name:	srt_StatementScenarioAxis=urgn_SalesOver300MillionWithFDAApprovalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

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%