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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2021
Prepaid forward obligation at closing of RTW Transaction |  |  | $ 85,713 | $ 75,000 | $ 75,000 |
Capitalized closing costs |  |  |  |  | (2,599) |
Financing on prepaid forward obligation | $ 4,819 | $ 6,828 | 16,478 | $ 9,948 | 17,291 |
Amounts paid and payable |  |  | (5,999) |  | (3,979) | [1]
Carrying value of prepaid forward obligation as of December 31, 2021 | $ 96,192 |  | $ 96,192 |  | $ 85,713 |
[1] | $1.5M of the Amounts paid and payable are included as current portion of the prepaid forward obligation within other current liabilities on the balance sheet

X
- Definition The amount of capitalized closing costs on prepaid forward obligation. + References No definition available. + Details
Name: | urgn_CapitalizedClosingCostsOnPrepaidForwardObligation
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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