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Note 9 - Prepaid Forward Obligation - Activity in the Carrying Value of the Prepaid Forward Liability (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2026 | Mar. 31, 2025 | Dec. 31, 2025
Carrying value of prepaid forward obligation |  | $ 127,276 | $ 121,387 | $ 121,387
Financing on prepaid forward obligation |  | 4,506 | $ 4,583 | 18,503
Amounts paid and payable | [1] | (3,554) |  | (12,614)
Carrying value of prepaid forward obligation |  | $ 128,228 |  | $ 127,276
[1] | $3.6 million and $3.4 million of the Amounts paid and payable are included as the current portion of the prepaid forward obligation within other current liabilities on the condensed consolidated balance sheets as of March 31, 2026, and December 31, 2025, respectively.

X
- Definition The amount of decrease in prepaid forward obligation from amounts paid and payable. + References No definition available. + Details
Name: | urgn_DecreaseInPrepaidForwardObligationAmountsPaidAndPayable
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of financing on the preapid forward obligation during the period. + References No definition available. + Details
Name: | urgn_FinancingOnPrepaidForwardObligation
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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