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Inventories (Details) Note 6 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) Other current liabilities Note 7 - Marketable Securities - Summary of Marketable Securities (Details) Note 7 - Marketable Securities - Fair Values of Marketable Securities by Contractual Maturity (Details) Note 8 - Property and Equipment - Property and Equipment (Details) Note 9 - Prepaid Forward Obligation - Activity in the Carrying Value of the Prepaid Forward Liability (Details) Note 10 - Long-term Debt (Details) Note 11 - Leases - Components of Lease Cost (Details) Note 11 - Leases - Amounts of Assets and Liabilities (Details) Note 11 - Leases - Supplemental Information Related to Leases (Details) Note 11 - Leases - Maturities of Lease Liabilities (Details) Note 11 - Leases - Sublease Income Recognized (Details) Note 12 - Revenue From Product Sales - Net Product Sales (Details) Note 12 - Revenue From Product Sales - Sales Reserves Activity (Details) Note 15 - Share-based Compensation - Effect of Share-based Compensation On the Condensed Consolidated Statements of Operations (Details) Notes To Financial Statements Notes To Financial Statements [Abstract] Maturities of marketable securities Corporate Debt Securities [Member] Other comprehensive income US Treasury and Government [Member] us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition Debt Securities, Available-for-Sale, Unrealized Loss Position, Total Accounts payable and accrued expense Total accounts payable and accrued expense Employee related accrued expense Lessee, Operating Leases [Text Block] Accounts payable Secured Debt [Member] Accrued other expense us-gaap_PolicyTextBlockAbstract Accounting Policies us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) 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Arrangement by Share-based Payment Award, Award Vesting Period (Year) us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardAwardVestingRightsPercentage Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage Current liabilities: Vesting [Axis] Vesting [Domain] Share-Based Payment Arrangement, Tranche One [Member] us-gaap_Assets Total Assets us-gaap_OperatingLeaseImpairmentLoss Operating Lease, Impairment Loss Plan Name [Axis] Plan Name [Domain] us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedShareBasedAwardsOtherThanOptions Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount Sublease income from fixed lease payments us-gaap_SubleaseIncome Sublease Income Sublease income us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1 Share-Based Payment Arrangement, Nonvested Award, 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us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities Related Party Transactions Disclosure [Text Block] us-gaap_IncomeTaxExpenseBenefit Income tax expense Cash and cash equivalents Cash and Cash Equivalents, at Carrying Value, Total Other current liabilities us-gaap_IncreaseDecreaseInOtherCurrentLiabilities Share-based compensation us-gaap_AllocatedShareBasedCompensationExpense Amendment Flag Statements of Comprehensive Loss us-gaap_ComprehensiveIncomeNetOfTax Comprehensive Loss City Area Code Use of Estimates, Policy [Policy Text Block] New Accounting Pronouncements, Policy [Policy Text Block] us-gaap_SharesOutstanding Balance (in shares) Balance (in shares) Ordinary shares, outstanding (in shares) Common Stock, Shares, Outstanding, Ending Balance (in shares) Current Fiscal Year End Date us-gaap_DebtInstrumentBasisSpreadOnVariableRate1 Debt Instrument, Basis Spread on Variable Rate Variable lease cost us-gaap_LeaseCost Lease, Cost, Total us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets Prepaid expense and other current assets Basis of Accounting [Text Block] Weighted-average discount rate of operating leases Document Fiscal Period Focus Operating lease cost Document Fiscal Year Focus Consolidation, Policy [Policy Text Block] Lease, Cost [Table Text Block] Document Period End Date Right-of-use assets obtained in exchange for new operating lease liabilities Weighted-average remaining lease term of operating leases (Year) Entity File Number Entity Emerging Growth Company Long-term debt at closing of Pharmakon loan Document Type Entity Small Business Entity Shell Company Document Information [Line Items] Document Information [Table] Entity Filer Category Entity Current Reporting Status London Interbank Offered Rate (LIBOR) [Member] Variable Rate [Domain] Schedule of Long-Term Debt Instruments [Table Text Block] Variable Rate [Axis] us-gaap_IncreaseDecreaseInAccountsReceivable Accounts receivable Share-based compensation Entity Tax Identification Number Entity Central Index Key Entity Registrant Name Entity [Domain] Legal Entity [Axis] Entity Address, Address Line One Entity Address, City or Town Entity Address, Postal Zip Code Entity Address, State or Province Entity Common Stock, Shares Outstanding Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Marketable Securities [Table Text Block] us-gaap_IncreaseDecreaseInOtherNoncurrentAssets Other non-current assets Investments [Domain] us-gaap_IncreaseDecreaseInInventories Inventory Trading Symbol Investment Type [Axis] Nature of Operations [Text Block] Local Phone Number Exercise of options into ordinary shares (in shares) us-gaap_TableTextBlock Notes Tables Exercise of options into ordinary shares Selling, general and administrative expense urgn_InventoryCurrentAndNoncurrentNet Total inventories The amount of inventory, net of allowances, classified as both current and noncurrent. Raw materials Inventory, Raw Materials, Net of Reserves us-gaap_LongTermDebtTerm Long-Term Debt, Term (Year) us-gaap_LiabilitiesAndStockholdersEquity Total Liabilities and Shareholders' Equity (Deficit) Finished goods Accumulated deficit Retained Earnings (Accumulated Deficit), Total Research and development expense Accumulated other comprehensive income (loss) Money Market Funds [Member] Cash and Cash Equivalents [Axis] Debt Disclosure [Text Block] Cash and Cash Equivalents [Domain] Changes in operating assets and liabilities: Restricted deposit us-gaap_DisclosureTextBlockAbstract Notes to Financial Statements Inventory Disclosure [Text Block] us-gaap_InterestExpenseLongTermDebt Interest expense Interest expense on long-term debt Long-term lease liabilities Long-term lease liability Schedule of Inventory, Current [Table Text Block] Present value of lease liabilities Operating Lease, Liability, Total Other current liabilities us-gaap_OperatingLeaseLiabilityCurrent Subsequent Events [Text Block] Right of use asset Right of use asset us-gaap_LesseeOperatingLeaseLiabilityPaymentsDue Total future minimum lease payments Less: Interest us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearThree 2025 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueNextTwelveMonths 2023 us-gaap_LesseeOperatingLeaseLiabilityPaymentsDueYearTwo 2024 Foreign Currency Transactions and Translations Policy [Policy Text Block] Lessee, Operating Lease, Liability, Maturity [Table Text Block] Share-based compensation us-gaap_ShareBasedCompensation Other non-current assets Lessee, Leases [Policy Text Block] us-gaap_LesseeOperatingLeaseLiabilityPaymentsRemainderOfFiscalYear Remainder of 2022 Earnings Per Share, Policy [Policy Text Block] Prepaid forward obligation Prepaid forward obligation at closing of RTW Transaction Carrying value of prepaid forward obligation as of December 31, 2021 The amount of the prepaid forward obligation as of the balance sheet date. urgn_InterestAndOtherIncomeNet Total other income (expense) The amount of interest and other income, net of expenses. Financing on prepaid forward obligation Financing on prepaid forward obligation The amount of financing on the preapid forward obligation during the period. Operating expense: Income Tax, Policy [Policy Text Block] us-gaap_AccretionAmortizationOfDiscountsAndPremiumsInvestments Amortization on marketable securities us-gaap_LesseeOperatingLeaseTermOfContract Lessee, Operating Lease, Term of Contract (Month) Research and Development Expense, Policy [Policy Text Block] Marketable securities us-gaap_AvailableForSaleSecuritiesDebtSecuritiesNoncurrent Depreciation and amortization Depreciation, Depletion and Amortization, Total Share-Based Payment Arrangement, Director [Policy Text Block] us-gaap_AssetsCurrent Total current assets Non-current assets: Stockholders' Equity Note Disclosure [Text Block] Selling, General and Administrative Expenses, Policy [Policy Text Block] Ordinary shares, NIS 0.01 par value; 100,000,000 shares authorized at March 31, 2022 and December 31, 2021; 22,682,221 and 22,462,995 shares issued and outstanding as of March 31, 2022 and December 31, 2021, respectively Adjustment to reconcile net loss to net cash from operating activities: Measurement Frequency [Axis] Measurement Frequency [Domain] Fair Value, Recurring [Member] Ordinary shares, authorized (in shares) Common Stock, Shares Authorized (in shares) Commercial Paper [Member] Ordinary shares, issued (in shares) Certificates of Deposit [Member] Ordinary shares, par value (in ILS per share) us-gaap_CommonStockCapitalSharesReservedForFutureIssuance Common Stock, Capital Shares Reserved for Future Issuance (in shares) urgn_ProceedsFromPrepaidForwardArrangementNet Proceeds from Prepaid Forward Arrangement, Net The amount of cash inflow from prepaid forward arrangement, net of transaction costs. Statistical Measurement [Domain] Operating cash flows from operating leases Maximum [Member] urgn_OperatingLeaseLiabilityNoncashAdjustments Lease liability The amount of noncash adjustments to operating lease liability. Supplemental Disclosures of Non-Cash Activities Minimum [Member] Accrued financing on prepaid forward obligation The amount of prepaid financing on prepaid forward obligation. Product and Service [Axis] Product and Service [Domain] Statistical Measurement [Axis] Debt, Policy [Policy Text Block] Non-cash issuance cost The amount of issuance costs that were incurred during a noncash or partial noncash transaction. Property, Plant and Equipment Disclosure [Text Block] Property, Plant and Equipment [Table Text Block] Inventories Schedule of Sales Reserves [Table Text Block] Tabular disclosure for the schedule of sales reserves. Fair Value Hierarchy and NAV [Domain] Accruals The amount of sales reserve accruals during the period. Utilizations The amount of utilization of sales reserve during the period. Fair Value, Inputs, Level 1 [Member] Government Sponsored Programs Reserves [Member] Related to government sponsored programs reserves. Fair Value, Inputs, Level 2 [Member] urgn_LesseeOperatingLeaseLiabilityToBePaidAfterYearThree 2026 and thereafter Amount of lessee's undiscounted obligation for lease payment for operating lease due after third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). Fair Value Hierarchy and NAV [Axis] Other Reserves [Member] Related to other reserves. Accrued sales reserves The value of accrued sales reserve classified as current. Prepaid Forward Obligation Policy [Policy Text Block] Disclosure for accounting policy for prepaid forward obligation. Property, Plant and Equipment, Useful Life [Table Text Block] Tabular disclosure of the useful life of property, plant and equipment. Useful life (Year) Manufacturing Equipment [Member] Represents manufacturing equipment. Furniture [Member[ Represents furniture. Cash Flows From Operating Activities Cash, Cash Equivalents and Marketable Securities Policy [Policy Text Block] Disclosure of accounting policy for cash, cash equivalents and marketable securities. Revenue [Policy Text Block] Statement [Line Items] Laboratory Equipment [Member] Represents laboratory equipment. Computers and Software [Member] Represents computers and software. Other Financial Information [Text Block] The entire disclosure for other financial information. Accounts receivable us-gaap_CashCashEquivalentsAndShortTermInvestments Cash, Cash Equivalents, and Short-Term Investments, Total Additional paid-in capital AOCI Attributable to Parent [Member] Shareholders' equity: Leasehold Improvements [Member] Marketable securities Property, Plant and Equipment, Policy [Policy Text Block] Long-Lived Tangible Asset [Axis] Interest Income and Interest Expense Disclosure [Table Text Block] Long-Lived Tangible Asset [Domain] Restricted cash Current assets: Fair Value Disclosures [Text Block] us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsIncludingDisposalGroupAndDiscontinuedOperations Cash, Cash Equivalents and Restricted Cash at Beginning of Period Cash, Cash Equivalents and Restricted Cash at End of Period Inventory, Policy [Policy Text Block] Interest income us-gaap_CashCashEquivalentsRestrictedCashAndRestrictedCashEquivalentsPeriodIncreaseDecreaseIncludingExchangeRateEffect Increase (Decrease) in Cash and Cash Equivalents us-gaap_NetCashProvidedByUsedInFinancingActivities Net cash provided by financing activities us-gaap_Liabilities Total Liabilities Commitments and contingencies (Note 18) us-gaap_OperatingIncomeLoss Operating loss us-gaap_NetCashProvidedByUsedInOperatingActivities Net cash used in operating activities us-gaap_NetCashProvidedByUsedInInvestingActivities Net cash (used in) provided by investing activities Prepaid expense and other current assets urgn_AccruedSalesReserve Balance Balance Carrying value as of the balance sheet date of accrued sales reserve. Cost of revenue Accrued research and development expense Carrying value as of the balance sheet date of accrued research and development expense us-gaap_GrossProfit Gross profit Accrued clinical expense Carrying value as of the balance date of accrued clinical expense. Counterparty Name [Axis] Counterparty Name [Domain] Accrued selling, general and administrative expense Carrying value as of the balance sheet date of accrued selling, general and administrative expense. Other finance (expense), net The amount of other finance income (expense). us-gaap_UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestAccrued Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued, Total Maturities after one year through three years Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through third fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). us-gaap_PaymentsOfStockIssuanceCosts Issuance cost related to at-the-market issuances Concentration Risk, Credit Risk, Policy [Policy Text Block] RTW Investments [Member] Represents RTW Investments (“RTW”). Prepaid Forward Obligation Disclosure [Text Block] The entire disclosure for the prepaid forward obligation. Sales of Up to $200 Million [Member] Represents sales of up to $200 million. Sales Between $200 Million and $300 Million [Member] Represents sales between $200 million and $300 million. Sales Over $300 Million [Member] Represents sales over $300 million. urgn_PrepaidForwardAgreementFutureCashFlowsIncreaseInPercentageOfNetSales Prepaid Forward Agreement, Future Cash Flows, Increase in Percentage of Net Sales The increase in percentage of net sales for future cash flows under the prepaid forward agreement. urgn_ProceedsFromPrepaidForwardObligation Proceeds from Prepaid Forward Obligation The amount of cash inflow for prepaid forward obligation. Scenario [Domain] urgn_PrepaidForwardAgreementFutureCashPaymentsPercentageOfNetSales Prepaid Forward Agreement, Future Cash Payments, Percentage of Net Sales The percentage of net sales for future cash payments under the prepaid forward agreement. UGN-102 [Member] Represents UGN-102. urgn_PrepaidForwardAgreementMinimumFutureCashFlows Prepaid Forward Agreement, Minimum Future Cash Flows The minimum amount of future cash flows under the prepaid forward agreement. urgn_PrepaidForwardObligationExpectedCashFlowsInNextTwelveMonths Prepaid Forward Obligation, Expected Cash Flows in Next Twelve Months The amount of expected cash flows in the next twelve months for the prepaid forward obligation. Retained Earnings, Appropriated [Member] Schedule of Activity in the Carrying Value of the Prepaid Forward Liability [Table Text Block] The tabular disclosure of activity in the carrying value of the prepaid forward liability. Proceeds from exercise of options into ordinary shares Revenue Sales Up to $200 Million with FDA Approval [Member] Represents sales up to $200 million with FDA approval. Sales Between $200 Million and $300 Million with FDA Approval [Member] Represents sales between $200 million and $300 million with FDA approval. Sales Over $300 Million with FDA Approval [Member] Represents sales over $300 million with FDA approval. Scenario [Axis] Jelmyto [Member] Represents Jelmyto. Lease Agreement for Office in Los Angeles, California [Member] Represents the lase agreement for office in Los Angeles, California. Lease Agreement for Office in Princeton, New Jersey [Member] Represents lease agreement for office in Princeton, New Jersey. Assets and Liabilities, Lessee [Table Text Block] Tabular disclosure of lessee's assets and liabilities. Additional Paid-in Capital [Member] urgn_CapitalizedClosingCostsOnPrepaidForwardObligation Capitalized closing costs The amount of capitalized closing costs on prepaid forward obligation. Common Stock [Member] UroGen Pharma Inc. [Member] Represents UroGen Pharma Inc. Lessee, Operating Lease, Sublease Income Recognized Net in Operating Expenses [Table Text Block] Tabular disclosure of sublease income recognized net in operating expenses under operating lease of the lessee. Equity Components [Axis] Equity Component [Domain] Schedule of Supplemental Information Related to Leases [Table Text Block] Tabular disclosure of supplemental information related to leases. Other Noncurrent Assets [Member] Other Current Liabilities [Member] urgn_PaymentsForLicenseAgreement Payments for License Agreement The amount of cash outflow for the license agreement. us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest Loss before income taxes urgn_LicenseAgreementMaximumPayableForCertainClinicalDevelopmentAndRegulatoryMilestones License Agreement, Maximum Payable for Certain Clinical Development and Regulatory Milestones The maximum amount to be paid for certain clinical developments and regulatory milestones under the license agreement. urgn_LicenseAgreementMaximumPayableForCertainCommercialMilestones License Agreement, Maximum Payable for Certain Commercial Milestones The maximum amount of to be paid upon achievement of certain commercial milestones. Agenus Inc. [Member] Represents Agenus Inc. MD Anderson [Member] Represents MD Anderson. Share Option Plan [Member] Represents information regarding a share option plan. urgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardIndividualVotingPowersPercentage Share-based Compensation Arrangement By Share-based Payment Award, Individual Voting Powers, Percentage Represents the individual voting powers percentage that serves as the threshold beyond which certain pricing criteria will apply. us-gaap_DebtSecuritiesAvailableForSaleAccruedInterestAfterAllowanceForCreditLoss Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Total urgn_ShareBasedCompensationArrangementByShareBasedPaymentAwardPercentageOfPurchasePriceForIndividualsHavingMoreThanTenPercentOfCombinedVotingPower Share-based Compensation Arrangement By Share-based Payment Award, Percentage of Purchase Price for Individuals Having More than Ten Percent of Combined Voting Power Stock options exercise price percentage for individuals possesses more than 10% of the combined voter power. Two Thousand Seventeen Equity Incentive Plan [Member] Represents information regarding the 2017 Equity Incentive Plan. urgn_LicenseAgreementRoyaltyPercentageOfNetSalesOfLicensedProducts License Agreement, Royalty, Percentage of Net Sales of Licensed Products The percentage of net sales of licensed products to be paid as royalties under the license agreement. urgn_LicenseAgreementExpirationTerm License Agreement, Expiration Term (Year) The expiration term of the license agreement. urgn_CollaborationAgreementTerm Collaboration Agreement, Term (Year) The term of the collaboration agreement. Disaggregation of Revenue [Table Text Block] Revenue from Contract with Customer [Text Block] Non-cash new lease liabilities Represents the amount include in supplemental disclosures of non-cash activities for new lease liabilities. Balance Sheet Location [Axis] Balance Sheet Location [Domain] Document Quarterly Report Entity Incorporation, State or Country Code us-gaap_UnrecognizedTaxBenefits Unrecognized Tax Benefits, Ending Balance Carrying value of Pharmakon loan as of March 31, 2022 Accounting Policies [Abstract] Significant Accounting Policies [Text Block] urgn_DebtInstrumentCapitalizedCostsAndDiscounts Capitalized costs and discounts Represents capitalized costs and discounts. Document Transition Report urgn_DebtInstrumentPaidAndPayableAmount Amounts paid and payable Represents the amount of paid and payable related to debt instrument. Selling, General and Administrative Expenses [Member] Entity Interactive Data Current Other income (expense) Represents other income (expense). urgn_SecuredLongTermDebtAdditionalDraw Secured Long Term Debt, Additional Draw Represents additional draw under the secured long term debt. urgn_PrepaidForwardAgreementMinimumFutureCashFlowsRate Prepaid Forward Agreement, Minimum Future Cash Flows, Rate (Rate) Represents the rate related to minimum future cash flow. Security Exchange Name Title of 12(b) Security urgn_SecuredLongTermDebtFirstTranche Secured Long Term Debt, First Tranche Represents the first tranche related to secured long term debt. Proceeds from issuance of long-term debt Receivable Type [Axis] Receivable [Domain] Research and Development Expense [Member] Income Statement Location [Axis] Income Statement Location [Domain] urgn_DebtInstrumentLIBORFloor Debt Instrument, LIBOR Floor Represents the debt instrument, LIBOR floor. Collaborative Arrangement Disclosure [Text Block] The 2019 Inducement Plan [Member] Related to the 2019 Inducement Plan. urgn_DecreaseInPrepaidForwardObligationAmountsPaidAndPayable Amounts paid and payable The amount of decrease in prepaid forward obligation from amounts paid and payable. Statement [Table] Statement of Financial Position [Abstract] Weighted average number of shares outstanding used in computation of basic and diluted loss per ordinary share (in shares) Net loss per ordinary share basic and diluted (in dollars per share) Statement of Cash Flows [Abstract] Lease Contractual Term [Domain] Statement of Stockholders' Equity [Abstract] Lease Contractual Term [Axis] Income Statement [Abstract] us-gaap_OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent Other comprehensive income Other comprehensive income Schedule of Accounts Payable and Accrued Liabilities [Table Text Block] Investments Classified by Contractual Maturity Date [Table Text Block] Cash Flows From Financing Activities Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block] Uncertain tax positions liability us-gaap_ResearchAndDevelopmentArrangementContractToPerformForOthersCostsIncurredGross Research and Development Arrangement, Contract to Perform for Others, Costs Incurred, Gross Amortization of right of use asset us-gaap_StockholdersEquity Total Shareholders' Equity (Deficit) Balance Balance Class of Stock [Axis] Long-term debt us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax Unrealized losses Unrealized gains Amortized cost basis