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Note 9 - Prepaid Forward Obligation - Activity in the Carrying Value of the Prepaid Forward Liability (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Prepaid forward obligation at closing of RTW Transaction			$ 85,713	$ 75,000	$ 75,000
Capitalized closing costs					(2,599)
Financing on prepaid forward obligation	$ 4,819	$ 6,828	16,478	$ 9,948	17,291
Amounts paid and payable			(5,999)		(3,979)	[1]
Carrying value of prepaid forward obligation as of December 31, 2021	$ 96,192		$ 96,192		$ 85,713
[1] $1.5M of the Amounts paid and payable are included as current portion of the prepaid forward obligation within other current liabilities on the balance sheet

X

- Definition

The amount of capitalized closing costs on prepaid forward obligation.

+ References

No definition available.

+ Details

Name:	urgn_CapitalizedClosingCostsOnPrepaidForwardObligation
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of decrease in prepaid forward obligation from amounts paid and payable.

+ References

No definition available.

+ Details

Name:	urgn_DecreaseInPrepaidForwardObligationAmountsPaidAndPayable
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of financing on the preapid forward obligation during the period.

+ References

No definition available.

+ Details

Name:	urgn_FinancingOnPrepaidForwardObligation
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of the prepaid forward obligation as of the balance sheet date.

+ References

No definition available.

+ Details

Name:	urgn_PrepaidForwardObligation
Namespace Prefix:	urgn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant