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Note 9 - Prepaid Forward Obligation (Details Textual) - USD ($) $ in Thousands	1 Months Ended		9 Months Ended
	May 31, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
Proceeds from Prepaid Forward Arrangement, Net			$ 0	$ 72,417
RTW Investments [Member]
Proceeds from Prepaid Forward Obligation	$ 75,000	$ 75,000
Proceeds from Prepaid Forward Arrangement, Net	$ 72,400	$ 72,400
Prepaid Forward Agreement, Minimum Future Cash Flows			$ 200,000
Prepaid Forward Agreement, Minimum Future Cash Flows, Rate (Rate)			13.00%
Prepaid Forward Obligation, Expected Cash Flows in Next Twelve Months			$ 0
RTW Investments [Member] | Sales of Up to $200 Million [Member] | Jelmyto [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		9.50%
Prepaid Forward Agreement, Future Cash Flows, Increase in Percentage of Net Sales		3.50%
RTW Investments [Member] | Sales Between $200 Million and $300 Million [Member] | Jelmyto [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		3.00%
RTW Investments [Member] | Sales Over $300 Million [Member] | Jelmyto [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		1.00%
RTW Investments [Member] | Sales Up to $200 Million with FDA Approval [Member] | UGN-102 [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		2.50%
RTW Investments [Member] | Sales Between $200 Million and $300 Million with FDA Approval [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		1.00%
RTW Investments [Member] | Sales Over $300 Million with FDA Approval [Member]
Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales		0.50%
Prepaid Forward Agreement, Future Cash Flows, Increase in Percentage of Net Sales		1.50%

X

- Definition

The increase in percentage of net sales for future cash flows under the prepaid forward agreement.

+ References

No definition available.

+ Details

Name:	urgn_PrepaidForwardAgreementFutureCashFlowsIncreaseInPercentageOfNetSales
Namespace Prefix:	urgn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The percentage of net sales for future cash payments under the prepaid forward agreement.

+ References

No definition available.

+ Details

Name:	urgn_PrepaidForwardAgreementFutureCashPaymentsPercentageOfNetSales
Namespace Prefix:	urgn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The minimum amount of future cash flows under the prepaid forward agreement.

+ References

No definition available.

+ Details

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

X

- Definition

Represents the rate related to minimum future cash flow.

+ References

No definition available.

+ Details

Name:	urgn_PrepaidForwardAgreementMinimumFutureCashFlowsRate
Namespace Prefix:	urgn_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The amount of expected cash flows in the next twelve months for the prepaid forward obligation.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of cash inflow from prepaid forward arrangement, net of transaction costs.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of cash inflow for prepaid forward obligation.

+ References

No definition available.

+ Details

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

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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X

- Details

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- Details

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- Details

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