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Note 12 - Revenue From Product Sales - Sales Reserves Activity (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Balance | $ 9,401 | $ 10,562
Accruals | 13,034 | 7,302
Utilizations | (10,532) | (10,624)
Balance | 11,903 | 7,240
Government Sponsored Programs Reserves [Member] |  |
Balance | 1,530 | 887
Accruals | 5,605 | 3,686
Utilizations | (5,566) | (3,889)
Balance | 1,569 | 684
Medicare Refunds for Discarded Drug Reserve [Member] |  |
Balance | 4,022 | 7,729
Accruals | 884 | 903
Utilizations | 0 | (3,809)
Balance | 4,906 | 4,823
Other Reserves [Member] |  |
Balance | 3,849 | 1,946
Accruals | 6,545 | 2,713
Utilizations | (4,966) | (2,926)
Balance | $ 5,428 | $ 1,733

X
- Definition Carrying value as of the balance sheet date of accrued sales reserve. + References No definition available. + Details
Name: | urgn_AccruedSalesReserve
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of sales reserve accruals during the period. + References No definition available. + Details
Name: | urgn_SalesReserveAccruals
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition The amount of utilization of sales reserve during the period. + References No definition available. + Details
Name: | urgn_SalesReserveUtilization
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=urgn_GovernmentSponsoredProgramsReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=urgn_MedicareRefundsForDiscardedDrugReserveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis=urgn_OtherReservesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |