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Leases - Schedule of Sublease Income Recognized Net within Operating Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2020 | Sep. 30, 2020
Leases [Abstract] |  |
Sublease income from fixed lease payments | $ 56 | $ 168

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- Definition Lessee operating sub lease income from fixed lease payments. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeaseIncomeFromFixedLeasePayments
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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