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Note 9 - Prepaid Forward Obligation (Tables) | 3 Months Ended
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Mar. 31, 2026
Notes Tables |
Schedule of Activity in the Carrying Value of the Prepaid Forward Liability [Table Text Block] |
Carrying value of prepaid forward obligation as of December 31, 2024 |  | $ | 121,387 |
Financing on prepaid forward obligation |  |  | 18,503 |
Amounts paid and payable (1) |  |  | (12,614 | )
Carrying value of prepaid forward obligation as of December 31, 2025 |  |  | 127,276 |
Financing on prepaid forward obligation |  |  | 4,506 |
Amounts paid and payable (1) |  |  | (3,554 | )
Carrying value of prepaid forward obligation as of March 31, 2026 |  | $ | 128,228 |

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- Definition The tabular disclosure of activity in the carrying value of the prepaid forward liability. + References No definition available. + Details
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Namespace Prefix: | urgn_
Data Type: | dtr-types:textBlockItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_TableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration