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Note 10 - Long-term Debt (Details Textual) - Secured Debt [Member] - USD ($) $ in Millions		1 Months Ended
	Mar. 07, 2022	Jul. 31, 2023
Secured Long-Term Debt, Noncurrent	$ 100.0
Secured Long Term Debt, First Tranche	75.0
Secured Long Term Debt, Additional Draw	$ 25.0
Long-Term Debt, Term (Year)	5 years
Debt Instrument, LIBOR Floor	1.25%
Debt Issuance Costs, Gross	$ 4.2
London Interbank Offered Rate (LIBOR) 1 [Member]
Debt Instrument, Basis Spread on Variable Rate	8.25%
Secured Overnight Financing Rate (SOFR) [Member] | Subsequent Event [Member]
Debt Instrument, Basis Spread on Variable Rate		0.26161%

X

- Definition

Represents the debt instrument, LIBOR floor.

+ References

No definition available.

+ Details

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Namespace Prefix:	urgn_
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Balance Type:	na
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X

- Definition

Represents additional draw under the secured long term debt.

+ 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 first tranche related to secured long term debt.

+ References

No definition available.

+ Details

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

X

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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X

- Definition

Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-3

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X

- Definition

Period between issuance and maturity of long-term debt, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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X

- Definition

Carrying amount of collateralized debt obligations with maturities initially due after one year or beyond the operating cycle, if longer, excluding the current portion. Obligations include, but not limited to, mortgage loans, chattel loans, and other borrowings secured by assets.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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- Details

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