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Leases - Schedule of Undiscounted Cash Flows to be Received Under Operating Sublease on an Annual Basis (Details) $ in Thousands | Sep. 30, 2020 USD ($)
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Leases [Abstract] |
Remainder of 2020 | $ 57
2021 | 235
2022 | 243
2023 | 251
2024 | 49
Lessee operating sublease payments to be received | $ 835

X
- Definition Lessee operating sub lease payments to be received. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceived
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating sub lease payments to be received four years. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceivedFourYears
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating sublease payments to be received next twelve months. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceivedNextTwelveMonths
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating sub lease payments to be received remainder of fiscal year. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceivedRemainderOfFiscalYear
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating sub lease payments to be received three years. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceivedThreeYears
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Lessee operating sub lease payments to be received two years. + References No definition available. + Details
Name: | urgn_LesseeOperatingSubLeasePaymentsToBeReceivedTwoYears
Namespace Prefix: | urgn_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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