Leases - Schedule of Undiscounted Cash Flows to be Received Under Operating Sublease on an Annual Basis (Details) $ in Thousands	Mar. 31, 2021 USD ($)
Leases [Abstract]
Remainder of 2021	$ 176
2022	243
2023	251
2024	49
Lessee operating sublease payments to be received	$ 719

Lessee operating sub lease payments to be received remainder of fiscal year.

No definition available.

Name:	urgn_LesseeOperatingSubLeasePaymentsToBeReceivedRemainderOfFiscalYear
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant