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Note 3 - Significant Accounting Policies - Useful Lives of Property and Equipment (Details) | Jun. 30, 2023
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Computers and Software [Member] |
Useful life (Year) | 3 years
Laboratory Equipment [Member] | Minimum [Member] |
Useful life (Year) | 3 years
Laboratory Equipment [Member] | Maximum [Member] |
Useful life (Year) | 6 years 6 months
Furniture [Member[ | Minimum [Member] |
Useful life (Year) | 5 years
Furniture [Member[ | Maximum [Member] |
Useful life (Year) | 16 years 6 months
Manufacturing Equipment [Member] | Minimum [Member] |
Useful life (Year) | 2 years
Manufacturing Equipment [Member] | Maximum [Member] |
Useful life (Year) | 10 years

X
- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentUsefulLife
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=urgn_ComputersAndSoftwareMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=urgn_LaboratoryEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=urgn_FurnitureMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=urgn_ManufacturingEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |