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Leases - Schedule of Sublease Income Recognized Net within Operating Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	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