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Significant Accounting Policies - Schedule of Annual Rates of Depreciation (Details)	12 Months Ended
	Dec. 31, 2019
Computers and Software
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	33.00%
Laboratory Equipment \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	15.00%
Laboratory Equipment \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	30.00%
Furniture \| Minimum
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	6.00%
Furniture \| Maximum
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	15.00%
Manufacturing Equipment
Property Plant And Equipment [Line Items]
Property and equipment, annual rates of depreciation	50.00%

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
CURRENT ASSETS:
Cash and cash equivalents	$ 49,688	$ 101,318
Marketable securities	97,389
Restricted cash	523	253
Prepaid expenses and other current assets	1,034	672
TOTAL CURRENT ASSETS	148,634	102,243
NON-CURRENT ASSETS
Property and equipment, net	977	948
Restricted deposit	223	51
Right of use asset	3,735
Marketable securities	48,555
Other non-current assets	264	317
TOTAL ASSETS	202,388	103,559
CURRENT LIABILITIES:
Accounts payable and accrued expenses	11,186	8,540
Employee related accrued expenses	6,711	4,925
Other current liabilities	1,585
TOTAL CURRENT LIABILITIES	19,482	13,465
NON-CURRENT LIABILITY:
Long-term lease liability	2,604
TOTAL LIABILITIES	22,086	13,465
COMMITMENTS AND CONTINGENCIES (Note 14)
SHAREHOLDERS’ EQUITY:
Ordinary shares, NIS 0.01 par value; 100,000,000 shares authorized at December 31, 2019 and 2018; 21,026,184 and 16,214,883 shares issued and outstanding as of December 31, 2019 and 2018, respectively	57	44
Additional paid-in capital	407,986	212,921
Accumulated deficit	(228,017)	(122,871)
Accumulated other comprehensive income	276
TOTAL SHAREHOLDERS’ EQUITY	180,302	90,094
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ 202,388	$ 103,559

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands	Total	IPO	Ordinary Shares	Ordinary Shares IPO	Preferred Shares	Additional Paid-In Capital	Additional Paid-In Capital IPO	Accumulated Deficit	Other Comprehensive Income
Balance at Dec. 31, 2016	$ 16,307		$ 6		$ 13	$ 43,502		$ (27,214)
Balance,Share at Dec. 31, 2016			2,305,743		5,193,427
Exercise of options into ordinary shares	404		$ 2			402
Exercise of options into ordinary shares, shares			743,806
Share-based compensation	6,300					6,300
Exercise of warrants into preferred shares	4,732				$ 1	4,731
Exercise of warrants into preferred shares, shares					364,036
Exercise of preferred shares into ordinary shares			$ 14		$ (14)
Exercise of preferred shares into ordinary shares, shares			5,557,463		(5,557,463)
Issuance of ordinary shares in public offering, net of issuance expenses		$ 60,772		$ 15			$ 60,757
Issuance of ordinary shares in public offering, net of issuance expenses, shares				5,144,378
Net loss	(20,000)							(20,000)
Balance at Dec. 31, 2017	68,515		$ 37			115,692		(47,214)
Balance,Share at Dec. 31, 2017			13,751,390
Exercise of options into ordinary shares	2,401		$ 2			2,399
Exercise of options into ordinary shares, shares			780,567
Share-based compensation	30,642					30,642
Issuance of ordinary shares in public offering, net of issuance expenses		64,193		$ 5			64,188
Issuance of ordinary shares in public offering, net of issuance expenses, shares				1,682,926
Net loss	(75,657)							(75,657)
Balance at Dec. 31, 2018	90,094		$ 44			212,921		(122,871)
Balance,Share at Dec. 31, 2018			16,214,883
Exercise of options into ordinary shares	3,664		$ 2			3,662
Exercise of options into ordinary shares, shares			603,984
Share-based compensation	29,967					29,967
Issuance of ordinary shares in public offering, net of issuance expenses		$ 161,447		$ 11			$ 161,436
Issuance of ordinary shares in public offering, net of issuance expenses, shares				4,207,317
Other comprehensive income	276								$ 276
Net loss	(105,146)							(105,146)
Balance at Dec. 31, 2019	$ 180,302		$ 57			$ 407,986		$ (228,017)	$ 276
Balance,Share at Dec. 31, 2019			21,026,184

Leases - Schedule of Maturities of Lease Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Leases [Abstract]
2020	$ 1,758
2021	1,269
2022	1,101
2023	348
2024 and thereafter	58
Total future minimum lease payments	4,534
Less: Interest	345
Operating lease liabilities	$ 4,189
2019		$ 1,136
2020		1,251
2021		676
2022		567
2023		301
2024 and thereafter		58
Total future minimum lease payments		$ 3,989

Business and Nature of Operations

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Business and Nature of Operations

NOTE 1-BUSINESS AND NATURE OF OPERATIONS

Nature of Operations

UroGen Pharma Ltd. is an Israeli company incorporated in April 2004.

UroGen Pharma Inc., a subsidiary of UroGen Pharma Ltd., was incorporated in Delaware in October 2015 and began operating in February 2016.

UroGen Pharma Ltd. and UroGen Pharma Inc. (together the “Company”) is a biopharmaceutical company dedicated to building and commercializing novel solutions that treat specialty cancers and urologic diseases.

As of the date of issuance of the consolidated financial statements, the Company has the ability to fund its planned operations for at least the next 12 months. However, the Company’s product candidates may never achieve commercialization and it will continue to incur losses for the foreseeable future. Therefore, in order to fund the Company’s research and development expenses, general and administrative expenses and capital expenditures until such time that the Company can generate substantial revenues, the Company may need to raise additional funds.

Selected Quarterly Financial Data (Unaudited) - Summarized Quarterly Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Information Disclosure [Abstract]
Total revenues			$ 18			$ 283	$ 364	$ 481	$ 18	$ 1,128	$ 8,158
Total operating expenses	$ 39,839	$ 23,453	23,771	$ 22,433	$ 24,017	20,317	18,480	13,691	109,496	76,505
Loss from operations	(39,839)	(23,453)	(23,753)	(22,433)	(24,017)	(21,089)	(18,434)	(13,640)	(109,478)	(77,180)	(19,950)
Net loss attributable to common shareholders	$ (38,973)	$ (22,252)	$ (22,477)	$ (21,444)	$ (23,716)	$ (20,533)	$ (18,026)	$ (13,382)	$ (105,146)	$ (75,657)	$ (20,000)
Net loss per share attributable to common shareholders - basic and diluted	$ (1.86)	$ (1.06)	$ (1.08)	$ (1.11)	$ (1.46)	$ (1.28)	$ (1.14)	$ (0.88)	$ (5.12)	$ (4.80)	$ (2.14)

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Leases - Components of Lease Cost (Details) $ in Thousands	12 Months Ended
Leases - Components of Lease Cost (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Leases [Abstract]
Operating lease cost	$ 1,243
Sublease income	(19)
Variable lease cost	105
Lease, Cost	$ 1,329

License and Collaboration Agreements

12 Months Ended

Dec. 31, 2019

Liscense Agreement [Abstract]

License and Collaboration Agreements

NOTE 8- LICENSE AND COLLABORATION AGREEMENTS

Allergan Agreement

In October 2016, the Company entered into the Allergan Agreement with Allergan and granted Allergan an exclusive worldwide license to research, develop, manufacture and commercialize pharmaceutical products that contain RTGel and clostridial toxins (including BOTOX), alone or in combination with certain other active ingredients, referred to as the Licensed Products, which are approved for the treatment of adults with overactive bladder who cannot use or do not adequately respond to anticholinergics. Additionally, the Company granted Allergan a non-exclusive, worldwide license to use certain of our trademarks as required for Allergan to practice its exclusive license with respect to the Licensed Products.

Under the Allergan Agreement, Allergan is solely responsible, at its expense, for developing the Licensed Products and obtaining all regulatory approvals for Licensed Products worldwide. Allergan is also solely responsible, at its expense, for commercializing the Licensed Products worldwide after receiving the regulatory approval to do so. Allergan is required to use commercially reasonable efforts to develop and commercialize the Licensed Products for overactive bladder in certain major market countries.

The Company will supply Allergan with certain quantities of RTGel for development of Licensed Products through Phase 2 clinical trials using BOTOX together with RTGel in patients with overactive bladder, at Allergan’s request and expense. Allergan has the right to reduce the next milestone payment if there is a material supply failure from the Company. Prior to completion of the first Phase 2 clinical trial, Allergan has the right to request that the Company transfers to Allergan our manufacturing process for RTGel and Allergan will assume the responsibility to manufacture RTGel and Licensed Product for its own development and commercialization activities.

Allergan paid the Company a nonrefundable upfront license fee of $17.5 million upon signing the agreement, and, in the third quarter of 2017, the Company received an additional $7.5 million milestone payment upon the submission by Allergan of an IND to the FDA for a Licensed Product. In October 2017, Allergan began a Phase 2 study of RTGel in combination with BOTOX for the treatment of overactive bladder. Additionally, during the years ended December 31, 2018 and 2017 the Company recognized revenue of $1.1 million and $0.7 million related to RTGel that was supplied to Allergan, respectively.

Further, the Company is eligible to receive additional material milestone payments of up to an aggregate of $200.0 million upon the successful completion of certain development, regulatory and commercial milestones, including $20.0 million upon initiation of a Phase 3 clinical trial for a Licensed Product for overactive bladder; $15.0 million upon initiation of a Phase 3 clinical trial for a Licensed Product for a specified second indication; $50.0 million and $25.0 million upon the first commercial sale of a Licensed Product for overactive bladder in the United States and the European Union, respectively; $25.0 million and $15.0 million upon the first commercial sale of a Licensed Product for a specified second indication in the United States and the European Union, respectively; and $50.0 million upon net sales of all Licensed Products of $500.0 million. Allergan will pay the Company a tiered royalty in the low single digits based on worldwide annual net sales of Licensed Products, subject to certain reductions for the market entry of competing products and/or loss of our patent coverage of Licensed Products. The Company is responsible for payments to any third party for certain RTGel-related third party intellectual properties.

Under the Allergan Agreement, Allergan granted the Company a non-exclusive, sublicensable, fully paid-up, perpetual, worldwide license under any improvements Allergan makes to the composition, formulation, or manufacture of RTGel for the research, development, manufacture and commercialization of any product containing RTGel and any active ingredient (other than a clostridial toxin) for all indications other than indications covered by the agreement and an exclusive, sublicensable, royalty-bearing (in low single digits), perpetual worldwide license under such improvements for use in the prevention or treatment of oncology indications.

Either party may terminate the Allergan Agreement for uncured material breach by the other party and for the insolvency of the other party. The Company may terminate the Allergan Agreement if Allergan or its affiliates challenges any of our patents licensed to Allergan and such patent challenge is not required under a court order or subpoena and is not a defense against a claim, action or proceeding asserted by the Company, its affiliates or licensees against Allergan, its affiliates or sublicensees. In addition, Allergan may unilaterally terminate the Allergan Agreement for any reason upon advance notice. If Allergan has the right to terminate the Allergan Agreement due to an uncured material breach by the Company, Allergan may elect to continue the agreement and reduce all future milestone and royalty payment obligations to the Company by a specified percentage. In the event of any termination of the Allergan Agreement, Allergan will assign or grant a right of reference to any regulatory documentation related to RTGel to the Company, all rights and licenses to Allergan will terminate, and the license Allergan granted to us under their improvements to RTGel will continue.

Agenus Agreement

On November 8, 2019, the Company entered into a license agreement with Agenus Inc, pursuant to which Agenus granted to the Company an exclusive, worldwide (not including Argentina, Brazil, Chile, Colombia, Peru, Venezuela and their respective territories and possessions), royalty-bearing, sublicensable license under Agenus’s intellectual property rights to develop, make, use, sell, import, and otherwise commercialize products incorporating a proprietary antibody of Agenus known as AGEN1884 for the treatment of cancers of the urinary tract via intravesical delivery. AGEN1884 is an anti-CTLA-4 antagonist that is currently being evaluated by Agenus as a monotherapy in PD-1 refractory patients and in combination with Agenus’ anti-PD-1 antibody in solid tumors. Initially, the Company plans to develop AGEN1884 in combination with UGN-201 for the treatment of high-grade non-muscle invasive bladder cancer.

Pursuant to the license Agreement, the Company paid Agenus an upfront fee of $10.0 million and has agreed to pay Agenus up to $115.0 million upon achieving certain clinical development and regulatory milestones, up to $85.0 million upon achieving certain commercial milestones, and royalties on net sales of licensed products in the 14%-20% range. The Company will be responsible for all development and commercialization activities. Under the terms of the license agreement, Agenus has agreed to use commercially reasonable efforts to supply AGEN1884 to the Company for use in preclinical studies or clinical trials.

Unless earlier terminated in accordance with the terms of the license agreement, the license agreement will expire on a product-by-product and country-by-country basis at the later of (a) the expiration of the last to expire valid claim of a licensed patent right that covers the licensed product in such country or (b) 15 years after the first commercial sale of the licensed product in such country. The Company may terminate the license agreement for convenience upon 180 days’ written notice to Agenus. Either party may terminate the license agreement upon 60 days’ notice to the other party if, prior to the first commercial sale of a licensed product, the Company substantially ceases to conduct development activities of the licensed products for nine consecutive months (and during such period, Agenus has complied with its obligations under the license agreement) other than in response to a requirement of an applicable regulatory authority or an event outside of the Company’s control. In addition, either party may terminate the license agreement in the event of an uncured material breach of the other party.

The Company recorded the $10.0 million milestone in acquired in-process research and development expenses for the year ended December 31, 2019.

Early-Stage Feasibility Evaluation with Janssen Research & Development, LLC

On April 22, 2019, the Company entered into an agreement with Janssen to conduct an early-stage feasibility evaluation in a therapeutic area of mutual interest. The Company and Janssen will each conduct certain activities under the terms of the agreement, and the Company will incur the costs of its own efforts related to the feasibility evaluation.

Commitments and Contingencies - Additional Information (Details) - IIA - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Commitments And Contingent Liabilities [Line Items]
Royalty amount payable	$ 0.8	$ 0.8
Minimum
Commitments And Contingent Liabilities [Line Items]
Royalty fees payable on product sales, percentage	3.00%
Maximum
Commitments And Contingent Liabilities [Line Items]
Royalty fees payable on product sales, percentage	5.00%
Maximum percentage of royalty payable on grant received	100.00%
Royalty amount payable	$ 2.1

License and Collaboration Agreements - Additional Information (Details) - USD ($)			3 Months Ended					12 Months Ended
	Nov. 08, 2019	Oct. 07, 2016	Jun. 30, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Research And Development Arrangement Contract To Perform For Others [Line Items]
Revenues			$ 18,000	$ 283,000	$ 364,000	$ 481,000		$ 18,000	$ 1,128,000	$ 8,158,000
Agenus Agreement
Research And Development Arrangement Contract To Perform For Others [Line Items]
Upfront fee	$ 10,000,000.0
Maximum amount payable upon achieving certain clinical development and regulatory milestones	115,000,000.0
Maximum amount payable upon achieving certain commercial milestones	$ 85,000,000.0
License agreement milestone in acquired in-process research and development expenses								10,000,000.0
Agenus Agreement \| After First Commercial Sale of Licensed Product
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement expiration term	15 years
Agenus Agreement \| Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Royalty ranging on net sales of licensed products	20.00%
Agenus Agreement \| Minimum
Research And Development Arrangement Contract To Perform For Others [Line Items]
Royalty ranging on net sales of licensed products	14.00%
Allergan
Research And Development Arrangement Contract To Perform For Others [Line Items]
Consideration received for license and future supply services		$ 17,500,000									$ 17,500,000
Milestone payment for licensing agreement							$ 7,500,000			7,500,000
Revenues								$ 18,000	$ 1,100,000	$ 700,000
Type Of Revenue Extensible List								urgn:RTGelMember	urgn:RTGelMember	urgn:RTGelMember
Allergan \| License Agreement
Research And Development Arrangement Contract To Perform For Others [Line Items]
Net sales of licensed products								$ 500,000,000.0
Allergan \| License Agreement \| Maximum
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								200,000,000.0
Allergan \| License Agreement \| Upon Initiation of Phase 3 Clinical Trial for a Licensed Product for Overactive Bladder
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								20,000,000.0
Allergan \| License Agreement \| Upon Initiation of Phase 3 Clinical Trial for a Licensed Product for a Specified Second Indication
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								15,000,000.0
Allergan \| License Agreement \| Upon Net Sales of All Licensed Products of $500.0 Million
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								50,000,000.0
Allergan \| United States \| License Agreement \| Upon First Commercial Sale of a Licensed Product for Overactive Bladder
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								50,000,000.0
Allergan \| United States \| License Agreement \| Upon First Commercial Sale of a Licensed Product for a Specified Second Indication
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								25,000,000.0
Allergan \| European Union \| License Agreement \| Upon First Commercial Sale of a Licensed Product for Overactive Bladder
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								25,000,000.0
Allergan \| European Union \| License Agreement \| Upon First Commercial Sale of a Licensed Product for a Specified Second Indication
Research And Development Arrangement Contract To Perform For Others [Line Items]
License agreement additional milestone payments eligible to receive								$ 15,000,000.0

Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Principles of Consolidation

The Company’s consolidated financial statements include the accounts of its subsidiary, UroGen Pharma Inc. Intercompany balances and transactions have been eliminated during consolidation.

Use of Estimates

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results may differ from those estimates. As applicable to these consolidated financial statements, the most significant estimates and assumptions relate to the fair value of share-based compensation and timing of revenue recognition.

Functional Currency

The U.S. dollar (“Dollar”) is the currency of the primary economic environment in which the operations of the Company and subsidiary are conducted. Therefore, the functional currency of the Company is the Dollar.

Accordingly, transactions in currencies other than the Dollar are measured and recorded in the functional currency using the exchange rate in effect at the date of the transaction. At the balance sheet date, monetary assets and liabilities that are denominated in currencies other than the Dollar are measured using the official exchange rate at the balance sheet date. The effects of foreign currency re-measurements are recorded in the consolidated statements of operations as “Interest and other (income) expenses, net.”

Cash and Cash Equivalents

The Company considers all highly liquid investments with an original maturity of three months or less when purchased to be cash equivalents. Cash and cash equivalents consist primarily of money market funds and bank money market accounts and are stated at cost, which approximates fair value.

Marketable Securities

The Company classifies its marketable securities as available-for-sale in accordance with the Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 320, “Investments — Debt Securities”. Available-for-sale debt securities are carried at fair value with unrealized gains and losses reported in other comprehensive income/loss within shareholders’ equity. Realized gains and losses and declines in fair value judged to be other than temporary, if any, on available-for-sale securities are included in interest and other income (expense), net. The cost of securities sold is based on the specific-identification method.

The Company reviews its available-for-sale securities for other-than-temporary declines in fair value below its cost basis each quarter and whenever events or changes in circumstances indicate that the cost basis of an asset may not be recoverable. This evaluation is based on a number of factors that include the length of time and extent to which fair value has been less than the cost basis and adverse conditions related specifically to the security, and the intent to sell, or whether the Company will more likely than not be required to sell, the security before recovery of its amortized cost basis. The Company’s assessment of whether a security is other-than-temporarily impaired could change in the future due to new developments or changes in assumptions related to any particular security.

Concentration of Credit Risk

Financial instruments, which potentially subject the Company to significant concentrations of credit risk, consist primarily of cash and cash equivalents and marketable securities. The primary objectives for the Company’s investment portfolio are the preservation of capital and the maintenance of liquidity. The Company does not enter into any investment transaction for trading or speculative purposes.

The Company’s investment policy limits investments to certain types of instruments such as certificates of deposit, money market instruments, obligations issued by the U.S. government and U.S. government agencies as well as corporate debt securities, and places restrictions on maturities and concentration by type and issuer. The Company maintains cash balances in excess of amounts insured by the FDIC and concentrated within a limited number of financial institutions. The accounts are monitored by management to mitigate the risk.

Income Taxes

The Company provides for income taxes based on pretax income, if any, and applicable tax rates available in the various jurisdictions in which we operate. Deferred taxes are computed using the asset and liability method. Under the asset and liability method, deferred income tax assets and liabilities are determined based on the differences between the financial reporting and tax bases of assets and liabilities and are measured using the currently enacted tax rates and laws. A valuation allowance is recognized to the extent that it is more likely than not that the deferred taxes will not be realized in the foreseeable future.

The Company follows a two-step approach in recognizing and measuring uncertain tax positions. The first step is to evaluate the tax position for recognition by determining if the available evidence indicates that it is more likely than not that the position will be sustained upon examination by the taxing authorities based on the technical merits of the position. If this threshold is met, the second step is to measure the tax benefit as the largest amount that is more likely than not of being realized upon ultimate settlement. As of December 31, 2019 and 2018, the Company had not accrued a provision for uncertain tax positions. See Note 12 for further discussion related to income taxes.

Property and Equipment

Property and equipment is recorded at historical cost, net of accumulated depreciation, amortization and, if applicable, impairment charges. We review our property and equipment assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable.

Annual rates of depreciation are as follows:

	%
Computers and software		33
Laboratory equipment	15-30
Furniture	6-15
Manufacturing equipment		50

Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or lease terms. See Note 6 for further discussion regarding property and equipment.

Leases

The Company is a lessee in several noncancelable operating leases, primarily for office space, office equipment and vehicles. The Company currently has no finance leases.

Commencing January 1, 2019, the Company accounts for leases in accordance with ASC Topic 842, “Leases”. The Company determines if an arrangement is a lease at inception. Right-of-use, or ROU, assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term as of the commencement date. Operating lease ROU assets are presented as operating lease right of use assets on the consolidated balance sheets. The current portion of operating lease liabilities is included in other current liabilities and the long-term portion is presented separately as operating lease liabilities on the consolidated balance sheets.

Lease expense is recognized on a straight-line basis for operating leases. Variable lease payments associated with the Company’s leases are recognized when the event, activity, or circumstance in the lease agreement on which those payments are assessed occurs. Variable lease payments are presented as operating expense on the consolidated statements of operations in the same line item as expense arising from fixed lease payments.

The Company’s lease terms may include options of the Company as the lessee to extend the lease. The lease extensions are included in the measurement of the right of use asset and lease liability if it is reasonably certain that it will exercise that option.

Because the Company’s leases do not provide an implicit rate of return, an incremental borrowing rate is used based on the information available at the commencement date in determining the present value of lease payments on an individual lease basis. The Company’s incremental borrowing rate for a lease is the rate of interest it would have to pay on a collateralized basis to borrow an amount equal to the lease payments under similar terms.

The Company has lease agreements with lease and non-lease components and has elected the practical expedient to combine lease and non-lease components for all underlying classes of assets.

We applied the modified retrospective transition method and elected the transition option to use the effective date of January 1, 2019 as the date of initial application (“Transition Date”). Consequently, the disclosures required under Topic 842 are not provided for dates and periods before January 1, 2019.

Topic 842 provides for a number of optional practical expedients in transition. The Company elected the ‘package of practical expedients’, which permits not to reassess under Topic 842 its prior conclusions about lease identification, lease classification, and initial direct costs. The Company did not elect the use-of-hindsight or the practical expedient pertaining to land easements; the latter not being applicable to the Company.

Topic 842 had a material impact on our consolidated balance sheets but did not have an impact on our consolidated statements of operations. The most significant impact was the recognition of $3.7 million in ROU assets and $4.2 million in lease liabilities.

ROU assets for operating leases are periodically reviewed for impairment losses under ASC 360-10, “Property, Plant, and Equipment”, to determine whether a ROU asset is impaired, and if so, the amount of the impairment loss to recognize.

Accounts Payable and Accrued Expenses

Accrued expenses and other current liabilities consist of the following as of December 31, 2019 and 2018, respectively (in thousands):

	December 31, 2019		December 31, 2018
Accounts payable	$	4,694	$	4,272
Accrued clinical expenses		399		673
Accrued research and development costs		2,644		780
Accrued general and administrative expenses		2,767		1,029
Accrued other expense		682		1,786
Total accrued expenses and other current liabilities	$	11,186	$	8,540

Revenues

The Company derives virtually all of its revenues from its license and supply agreement with Allergan. Under the agreement, the Company grants Allergan an exclusive license to develop, commercialize, and otherwise exploit products that contain RTGel and agrees to supply Allergan with pre-clinical and clinical quantities of the RTGel product, also referred to as the RTGelvials. The license agreement contains up-front license fees, future supply fees, development, regulatory, and sales-based milestone payments, and sales-based royalty payments.

The Company determined that Allergan is its customer and the license and supply agreements are in scope of ASC 606, which was adopted as of January 1, 2018. The Company adopted ASC 606 under the modified retrospective method, which did not have a material impact on the Consolidated Statements of Operations. Previously, the Company analyzed revenues under ASC 605, which states that revenue is recognized only when all of the following conditions have been met: (i) there is persuasive evidence of an arrangement; (ii) delivery has occurred: (iii) the fee is fixed or determinable: and (iv) collectability of the fee is reasonably assured. The adoption of ASC 606 did not have a material impact on the timing and manner of recognized revenues.

Under ASC 606, in determining the appropriate amount of revenue to be recognized as it fulfills its obligations under the agreements with Allergan, the Company performs the following steps:

Identification of the contract;

Determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract;

Measurement of the transaction price, including the constraint on variable consideration;

Allocation of the transaction price to the performance obligations;

Recognition of revenue when or as the Company satisfies each performance obligation.

In an arrangement with multiple goods and services, a good or service that is promised to a customer shall be considered a separate performance obligation if all of the following criteria are met:

The customer can benefit from the good or service either on its own or together with other resources that are readily available to the customer (that is, the good or service is capable of being distinct); and

The entity’s promise to transfer the good or service to the customer is separately identifiable from other promises in the contract (that is, the promise to transfer the good or service is distinct within the context of the contract).

The license agreement contains two performance obligations: (a) the license component and (b) Allergan’s right to require supply services of RTGel vials from the Company. The license component has standalone value (and therefore is accounted for separately from the supply services) since Allergan can use the license for its intended purposes without the Company’s supply services.

Allocating the Consideration in the Arrangement

Since the license to the Company’s intellectual property was determined to be functional and distinct from the other performance obligations identified in the arrangement, the Company recognized revenues from non-refundable, up-front fees allocated to the license when the license was transferred to Allergan and Allergan was able to use and benefit from the license. During the year ended December 31, 2016, the Company received consideration in an amount of $17.5 million for both the license of the intellectual property as well as Allergan’s right to future supply services (which would be provided in consideration for future payments to the Company according to the pricing stipulated in the supply agreement). The Company determined that the pricing of the supply services represented their standalone selling price. Accordingly, the Company allocated the entire upfront fee of $17.5 million to the license performance obligation.

Development and Regulatory Milestone Payments

At the inception of an arrangement that includes development milestone payments, the Company evaluates whether the development milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method. If it is probable that a significant revenue reversal would not occur, the associated development milestone value is included in the transaction price. Development milestone payments that are not within the control of the Company or the licensee, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The milestones are allocated entirely to the license performance obligation, as (1) the terms of milestone and royalty payments relate specifically to the license and (2) allocating milestones and royalties to the license performance obligation is consistent with the overall allocation objective, because management’s estimate of the supply fee approximates the standalone selling price for RTGel vials and management’s estimate of milestones and royalties approximates the standalone selling price of the license. During the year ended December 31, 2017, the Company recognized revenue of $7.5 million related to a development milestone payment resulting from Allergan’s submission of an IND application for the Company’s RTGel in combination with Allergan’s BOTOX for the treatment of overactive bladder to the U.S. FDA.

Royalties Based on Allergan’s Revenue

The Company is also entitled to royalties based on Allergan’s revenue from its product and recognize revenue related to the sales-base royalty when the related sales occur,

Supply of RTGel to Allergan

The Company recognizes revenue related to supply of RTGel at a point in time, upon delivery to Allergan. During the years ended December 31, 2019, 2018 and 2017, the Company recognized $18,000, $1.1 million and $0.7 million of revenue related to RTGel vials supplied to Allergan, respectively.

Shipping and handling costs associated with supply of RTGel vials are accounted for as a fulfillment cost and are in included in cost of revenues.

General and Administrative Expenses

General and administrative expenses consist primarily of personnel costs (including share-based compensation related to directors, executives, finance, commercial, medical affairs, business development, investor relations and human resources functions). Other significant costs include commercial, medical affairs, external professional service costs, facility costs, accounting and audit services, legal services and other consulting fees. General and administrative costs are expensed as incurred, and the Company accrues for services provided by third parties related to the above expenses by monitoring the status of services provided and receiving estimates from its service providers and adjusting its accruals as actual costs become known.

Research and Development

Research and development costs are expensed as incurred and consist primarily of the cost of salaries, share-based compensation expenses, payroll taxes and other employee benefits, subcontractors and materials used for research and development activities, including nonclinical studies, clinical trials, professional services, active pharmaceutical ingredient, or API, and other related manufacturing costs. The costs of services performed by others in connection with the research and development activities of an entity, including research and development conducted by others on behalf of the entity, shall be included in research and development costs and expensed as the contracted work is performed. The Company accrues for costs incurred as the services are being provided by monitoring the status of the trial or project and the invoices received from its external service providers. The Company adjusts its accrual as actual costs become known. Where contingent milestone payments are due to third parties under research and development arrangements or license agreements, the milestone payment obligations are expensed when the milestone results are achieved.

License fees and development milestone payments related to in-licensed products and technology are expensed as in-process research and development if it is determined at that point that they have no established alternative future use.

On November 8, 2019, the Company entered into a license agreement with Agenus Inc. pursuant to which Agenus granted to the Company an exclusive, worldwide (not including Argentina, Brazil, Chile, Colombia, Peru, Venezuela and their respective territories and possessions), royalty-bearing, sublicensable license under Agenus’s intellectual property rights to develop, make, use, sell, import, and otherwise commercialize products incorporating a proprietary antibody of Agenus known as AGEN1884 for the treatment of cancers of the urinary tract via intravesical delivery. AGEN1884 is an anti-CTLA-4 antagonist that is currently being evaluated by Agenus as a monotherapy in PD-1 refractory patients and in combination with Agenus’ anti-PD-1 antibody in solid tumors. Initially, the Company plans to develop AGEN1884 in combination with UGN-201 for the treatment of high-grade non-muscle invasive bladder cancer.

Pursuant to the license agreement, the Company paid Agenus an upfront fee of $10.0 million and has agreed to pay Agenus up to $115.0 million upon achieving certain clinical development and regulatory milestones, up to $85.0 million upon achieving certain commercial milestones, and royalties on net sales of licensed products in the 14% to 20% range. The Company will be responsible for all development and commercialization activities. Under the terms of the license agreement, Agenus has agreed to use commercially reasonable efforts to supply AGEN1884 to the Company for use in preclinical studies or clinical trials.

No inventory was purchased on the effective date and subsequent purchases of pre-clinical and clinical supplies are at arm’s length and are priced at cost plus mark-up. The Company’s acquired right to Agenus’s intellectual property represents a single identifiable asset sourced from the license agreement. Therefore, all the fair value associated with the license agreement is concentrated in one identifiable asset and is not considered a business in accordance with ASC 805-10-55-5A. Therefore, the Company has accounted for the right to Agenus’s intellectual property acquired under the license agreement as an acquisition of an asset.

Share-Based Compensation

Share-based compensation cost is measured at the grant date based on the fair value of the award and is recognized as expense over the required service period, which is equal to the vesting period. The fair value of stock options is determined using the Black-Scholes option-pricing model. The fair value of a restricted stock unit equaled the closing price of our ordinary shares on the grant date.The Company accounts for forfeitures as they occur according to the FASB’s Accounting Standards Update (ASU) 2016-09, Improvements to Employee Share-Based Payment Accounting.

The Company elected to recognize compensation costs for awards conditioned only on continued service that have a graded vesting schedule using the straight-line method and to value the awards based on the single-option award approach.

As of December 31, 2018, the Company adopted ASU 2018-07, Compensation-Stock Compensation, which establishes that the measurement of equity-classified nonemployee awards will be fixed at the grant date. The adoption of ASU 2018-07 did not have an impact on the condensed consolidated statements of operations.

Interest and Other (Income) Expense, net

Interest and Other (Income) Expense, net, consisted of the following as of December 31, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2019			2018			2017
Changes in fair value of warrants for preferred shares	$	—		$	—		$	168
Interest income on cash, cash equivalents and marketable securities		(4,616	)		(1,872	)		(125	)
Realized loss on sale of short-term investment		—			100			—
Other expense (income)		284			124			(12	)
Total interest and other (income) expenses	$	(4,332	)	$	(1,648	)	$	31

Net Loss per Common Share

Basic net loss per share is computed by dividing the net loss attributable to common shareholders by the weighted-average number of common shares outstanding. Diluted net loss per share is computed similarly to basic net loss per share except that the denominator is increased to include the number of additional common shares that would have been outstanding if the potential common shares had been issued and if the additional common shares were dilutive. In addition, the net loss attributable to common shareholders is adjusted for Series A and A-1 Preferred Stock dividends for the periods in which Series A and A-1 Preferred Stock is outstanding.

For all periods presented, potentially dilutive securities are excluded from the computation of fully diluted loss per share as their effect is anti-dilutive.

The following table summarizes the calculation of basic and diluted loss per common share for the periods presented (in thousands, except share and per share amounts):

	Year Ended December 31,
	2019		2018		2017
Basic and diluted:
Loss attributable to equity holders of the Company	$	105,146	$	75,657	$	20,000
Dividend accumulated for preferred shares during the period	$	—	$	—	$	825
Loss attributable to equity holders of the Company, after deducting dividend accumulated for preferred shares	$	105,146	$	75,657	$	20,825
Weighted-average number of ordinary shares		20,528,727		15,754,193		9,716,790
Loss per ordinary share	$	5.12	$	4.80	$	2.14

Recently Issued Accounting Pronouncements

In June 2016, the Financial Accounting Standards Board, or FASB, issued Accounting Standards Update, or ASU, No. 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments, or ASU 2016-13. ASU 2016-13 requires an entity to measure and recognize expected credit losses for certain financial instruments, including trade receivables, as an allowance that reflects the entity's current estimate of credit losses expected to be incurred. For available-for-sale debt securities with unrealized losses, the standard requires allowances to be recorded through net income instead of directly reducing the amortized cost of the investment under the current other-than-temporary impairment model. The standard is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2019, with early adoption permitted. We do not expect the adoption of this standard to have a significant impact on our financial statements.

Recently Adopted Accounting Pronouncements

In February 2016, FASB issued ASU No. 2016-02, “Leases”, or Topic 842. Topic 842 supersedes existing guidance in Leases (“Topic 840”). Topic 842 was subsequently amended by ASU No. 2018-01, Land Easement Practical Expedient for Transition to Topic 842; ASU No. 2018-10, Codification Improvements to Topic 842, Leases; and ASU No. 2018-11, Targeted Improvements. Topic 842 requires lessees to recognize right-of-use, or ROU, assets and lease liabilities on the balance sheet for leases with lease terms greater than twelve months, including those classified as operating leases. Leases are classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the income statement. The lease liability is measured at the present value of the unpaid lease payments and the ROU assets are derived from the calculation of the lease liability. Lease payments will include fixed and in-substance fixed payments, variable payments based on an index or rate, exercise price of purchase options that are reasonably certain to be exercised, termination penalties, and probable amounts the lessee will owe under a residual value guarantee. Topic 842 also requires lessees to disclose key information about leasing arrangements. Lessor accounting will remain largely unchanged.

The Company applied the modified retrospective transition method and elected the transition option to use the effective date of January 1, 2019 as the date of initial application, or Transition Date. Consequently, financial information was not updated, and the disclosures required under the Topic 842 were not provided for dates and periods before January 1, 2019.

Marketable Securities - Summary of Fair Values of Marketable Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Available For Sale Securities Debt Maturities Fair Value [Abstract]
Maturities within one year	$ 114,386	$ 89,965
Maturities after one year through three years	48,556
Debt securities, Available-for-sale	$ 162,942	$ 89,965

Subsequent Events - Additional Information (Details) - USD ($)	Jan. 12, 2020	Jan. 02, 2020	Dec. 31, 2019	Dec. 31, 2018
IIA
Subsequent Event [Line Items]
Maximum percentage of commitment to continue employment of research and development jobs	75.00%
Maximum term for commitment to continue employment of research and development jobs	3 years
Royalty amount payable			$ 800,000	$ 800,000
Subsequent Event \| IIA
Subsequent Event [Line Items]
Royalty amount payable	$ 6,600,000
Maximum \| IIA
Subsequent Event [Line Items]
Royalty amount payable			$ 2,100,000
Cowen and Company Limited Liability Company \| Maximum \| Subsequent Event
Subsequent Event [Line Items]
Aggregate offering price of ordinary shares		$ 100,000,000.0

Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

NOTE 16-SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED)

The following financial information reflects all normal recurring adjustments, which are, in the opinion of management, necessary for a fair statement of the results of the interim periods. Summarized quarterly data for 2019 and 2018 are as follows (in thousands, except per share data):

	2019
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Total revenues	$	—		$	18		$	—		$	—		$	18
Total operating expenses	$	22,433		$	23,771		$	23,453		$	39,839		$	109,496
Loss from operations	$	(22,433	)	$	(23,753	)	$	(23,453	)	$	(39,839	)	$	(109,478	)
Net loss attributable to common shareholders	$	(21,444	)	$	(22,477	)	$	(22,252	)	$	(38,973	)	$	(105,146	)
Net loss per share attributable to common shareholders - basic and diluted	$	(1.11	)	$	(1.08	)	$	(1.06	)	$	(1.86	)	$	(5.12	)

	2018
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Total revenues	$	481		$	364		$	283		$	—		$	1,128
Total operating expenses	$	13,691		$	18,480		$	20,317		$	24,017		$	76,505
Loss from operations	$	(13,640	)	$	(18,434	)	$	(21,089	)	$	(24,017	)	$	(77,180	)
Net loss attributable to common shareholders	$	(13,382	)	$	(18,026	)	$	(20,533	)	$	(23,716	)	$	(75,657	)
Net loss per share attributable to common shareholders - basic and diluted	$	(0.88	)	$	(1.14	)	$	(1.28	)	$	(1.46	)	$	(4.80	)

Net loss per share is computed independently for each of the quarters presented in the tables above. Therefore, the sum of the quarterly per-share calculations will not equal the annual per share calculation.

Leases - Schedule of Amounts Recognized Upon Adoption (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jan. 01, 2019
Leases [Abstract]
Right of use asset	$ 3,735	$ 3,022
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent	us-gaap:OtherAssetsNoncurrent
Long-term lease liability	$ 2,604	$ 2,429
Other current liabilities	$ 1,585	$ 929
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilitiesCurrent	us-gaap:OtherLiabilitiesCurrent

Share-Based Compensation - Additional Information (Details)					1 Months Ended					12 Months Ended
	Jan. 03, 2019 USD ($) $ / shares shares	Jan. 02, 2019 USD ($)	Oct. 12, 2018 shares	Jan. 01, 2018 shares	Dec. 31, 2019 USD ($)	Jun. 30, 2019 USD ($) $ / shares shares	Aug. 31, 2018 USD ($) shares	Apr. 30, 2017 USD ($) shares	Mar. 31, 2017 shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	May 31, 2019 shares	Dec. 31, 2016 shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation										$ 29,967,000	$ 30,642,000	$ 6,300,000
Stock options granted \| shares										955,732	1,195,000	589,600
Stock option exercise prices ranging lower limit \| $ / shares										$ 33.21	$ 38.64	$ 1.78
Stock option exercise prices ranging upper limit \| $ / shares										$ 47.57	$ 59.23	$ 39.26
Fair value of option granted										$ 27,600,000	$ 40,300,000	$ 10,900,000
Unrecognized compensation cost of employee options					$ 30,800,000					$ 30,800,000
Expected to be recognized over a weighted average period										1 year 8 months 19 days
Number of ordinary shares issuable upon vesting of options granted \| shares														9,600
Intrinsic value of stock options exercised										$ 14,200,000	31,600,000	21,400,000
Aggregate intrinsic value of the total vested and exercisable options					22,000,000.0					22,000,000.0
General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation										21,676,000	18,604,000	2,377,000
Research and Development Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation										$ 8,291,000	12,038,000	$ 3,923,000
Options \| Board Of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Grants related option awards		$ 3,400,000
Options \| Elizabeth Barrett
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option to purchase of ordinary shares \| shares	277,432
Exercise price of option to purchase of ordinary shares \| $ / shares	$ 47.57
Options \| Non-employee Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expected term						10 years
Awards vesting period						1 year
Estimated fair value of options granted						$ 1,900,000
Number of stock options approved for grants \| shares						70,000
Stock options granted \| shares						10,000
Exercise of option to ordinary shares conversion ratio						1
Stock option exercise \| $ / shares						$ 34.83
Options \| Chairman of Board of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted \| shares						10,000
Options \| General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation					900,000						7,200,000
Options \| Research and Development Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation											$ 7,200,000
Options \| General and Administrative and Research and Development Expenses \| Board Of Directors
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Estimated fair value of options granted		$ 2,800,000
Options \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage										33.00%
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards vesting period										2 years
Modifications of performance conditions in shares \| shares								67,200
Share-based compensation					0
Share-based compensation arrangement by share-based payment award, granted \| shares										455,465	116,493	123,300
Expected to be recognized over a weighted average period										2 years 14 days
Number of ordinary shares issuable upon vesting of options granted \| shares														28,800
Fair value of RSUs granted										$ 19,900,000	$ 5,700,000	$ 3,300,000
Unrecognized compensation cost of RSUs					$ 16,100,000					$ 16,100,000
Restricted Stock Units (RSUs) \| Senior Executive
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation							$ 0
Share-based compensation arrangement by share-based payment award, granted \| shares							10,466
Restricted Stock Units (RSUs) \| Elizabeth Barrett
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Option to purchase of ordinary shares \| shares	317,065
Restricted Stock Units (RSUs) \| General and Administrative Expenses
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation								$ 500,000
Restricted Stock Units (RSUs) \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting percentage										33.00%
2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of ordinary share issuable under the 2017 incentive plan \| shares									1,400,000	5,600,000
Number of ordinary shares reserved for issuance, percentage										12.00%
Increase in number of ordinary share issuable under the 2017 incentive plan \| shares			1,900,000	250,167
Stock Options and Restricted Stock Units (RSUs) \| Elizabeth Barrett
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Fair value	$ 24,100,000
Plan \| Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Awards vesting period										3 years
Combined voting power percentage										10.00%
Ordinary Shares \| 2019 Inducement Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of stock options approved for grants \| shares													900,000
Ordinary Shares \| 2017 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Maximum number of ordinary share issuable under the 2017 incentive plan \| shares			3,550,167	1,650,167
Maximum \| Plan \| Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock options granted, expected term										10 years
Minimum \| Plan \| Options
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Exercise price of stock options as percentage of fair market value of shares on grant date										100.00%
Stock options exercise price percentage for individuals possesses more than 10% of the combined voter power										110.00%

Share Based Compensation - Schedule of Fair Value of Options Granted (Details) - Options - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield	0.00%	0.00%	0.00%
Expected volatility, Minimum	74.09%	72.00%	68.45%
Expected volatility, Maximum	80.52%	82.04%	76.32%
Risk-free interest rate, Minimum	1.36%	1.72%	1.38%
Risk-free interest rate, Maximum	2.62%	3.07%	2.47%
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Value of ordinary shares	$ 33.21	$ 38.64	$ 1.58
Expected term	5 years 9 months 18 days	2 months 12 days	3 years 10 months 24 days
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Value of ordinary shares	$ 47.57	$ 59.23	$ 39.26
Expected term	10 years	10 years	10 years

Property and Equipment - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Property Plant And Equipment [Abstract]
Depreciation and amortization expense	$ 0.3	$ 0.4	$ 0.2

Income Taxes - Schedule of Deferred Income Taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
In respect of:
Net operating loss carryforward	$ 33,817	$ 16,943	$ 5,844
Deferred rent		61	46
Research and development expenses	4,591	3,891	2,887
Stock-based compensation	6,543	4,769	897
Issuance costs	2,063	1,367	1,261
In-process research and development	2,749	629	761
Right of use asset	(800)
Lease Liability	896
Accrued expenses	762	598	5
Depreciation of fixed assets	(90)	(93)
Other	62	84	24
Less—valuation allowance	$ (50,593)	$ (28,249)	$ (11,725)	$ (4,158)

Share-Based Compensation

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Share-Based Compensation

NOTE 11-SHARE-BASED COMPENSATION

In October 2010, the Company’s board of directors approved a share option plan (the “Plan”) for grants to Company employees, consultants, directors, and other service providers.

The grant of options to Israeli employees under the Plan is subject to the terms stipulated by Section 102 of the Israeli Income Tax Ordinance (“Section 102”). The option grants are subject to the track chosen by the Company, either the “regular income” track or the “capital gains” track, as set out in Section 102. The Company registered the Plan under the capital gains track, which offers more favorable tax rates to the employees. As a result, and pursuant to the terms of Section 102, the Company is not allowed to claim as an expense for tax purposes the amounts credited to the employees in respect of options granted to them under the Plan, including amounts recorded as salary benefits in the Company’s accounts, with the exception of the work-income benefit component, if any, determined on grant date. For non-employees and for non-Israeli employees, the Plan is subject to Section 3(i) of the Israeli Income Tax Ordinance.

Certain management and professional level employees typically receive stock options and RSU grants upon commencement of employment. Eligible employees may also receive a grant of stock options or RSUs annually. Non-employee members of our Board of Directors and any new, future directors may receive a grant of RSUs and/or stock options annually. The term of any stock option granted under the Plan cannot exceed 10 years. Options shall not have an exercise price less than 100% of the fair market value of the Company’s ordinary shares on the grant date, and generally vest over a period of three years. If the individual possesses more than 10% of the combined voting power of all classes of stock of the Company, the exercise price shall not be less than 110% of the fair market value of a common share of stock on the date of grant.

The Company’s RSU and stock option grants provide for accelerated or continued vesting in certain circumstances as defined in the plans and related grant agreements, including a termination in connection with a change in control. RSUs generally vest in a 33% increment upon the first anniversary of grant, and in equal quarterly amounts for the two years following the one-year anniversary of the grant date. Stock options generally vest in a 33% increment upon the first anniversary of the grant date, and in equal quarterly amounts for the three years following the one-year anniversary of the grant date.

In March 2017, the Company’s Board of Directors adopted the 2017 Equity Incentive Plan ("2017 Plan"), which was approved by the shareholders in April 2017. The 2017 Plan provides for the grant of incentive stock options to the Company's employees and for the grant of nonstatutory stock options, stock appreciation rights, restricted stock awards, restricted stock unit awards, performance stock awards, performance cash awards, and other forms of stock awards to the Company's employees, directors and consultants.

The maximum number of ordinary shares that may initially be issued under the 2017 Plan is 1,400,000. In addition, the number of ordinary shares reserved for issuance under the 2017 Plan will automatically increase on January 1st of each calendar year, from January 1, 2018 through January 1, 2026, so that the number of such shares reserved for issuance will equal 12% of the total number of ordinary shares outstanding on the last day of the calendar month prior to the date of each automatic increase, or a lesser number of shares determined by our board of directors. The maximum number of ordinary shares that may be issued upon the exercise of incentive stock options under the 2017 Plan is 5,600,000. On January 1, 2018, the share reserve increased by 250,167 to 1,650,167. On October 12, 2018, the Company filed a registration statement on Form S-8 increasing the amount of registered ordinary shares of the Company’s 2017 Plan by 1,900,000 to 3,550,167.

In April 2017, the Company’s board of directors approved modifications of performance conditions for 67,200 restricted stock units and contingent options for executive management. The Company recorded an expense of $0.5 million under general and administrative expenses with respect to these modifications.

In August 2018, in addition to the modifications, one senior executive was granted 10,466 RSUs in which no compensation expense was taken because the award vests upon a future performance condition that is not currently probable of occurring.

During the year ended December 31, 2018, the Company recorded $7.2 million in general and administrative and research and development expenses in the Company’s Statements of Operations for the year ended December 31, 2018 related to the stock option modifications related to the termination of certain senior executives, based on the executive’s respective allocations.

On January 2, 2019, the Company announced the resignation of its CEO, and the Company's board of directors approved a severance package, which included a combination of cash and modifications to grants of his related option awards in the amount of $3.4 million. The cash element followed the termination section in the CEO employment agreement, and the options element included acceleration to certain grants of his related option awards. The fair value of the modifications to these option awards was estimated at $2.8 million. The entire severance package was recorded in general and administrative and research and development expenses, based on salary allocations respectively, in the Company’s Statements of Operations for the year ended December 31, 2018.

On January 3, 2019, the Company appointed Elizabeth Barrett as its President and Chief Executive Officer. In connection with Ms. Barrett’s employment, she was granted 277,432 options to purchase the Company’s ordinary shares, at an exercise price of $47.57, as well as 317,065 RSUs, with a combined fair value of $24.1 million.

In May 2019, the Company adopted the UroGen Pharma Ltd. 2019 Inducement Plan (the “Inducement Plan”). Under the Inducement Plan, the Company is authorized to issue up to 900,000 ordinary shares pursuant to awards issued under the Inducement Plan. The only persons eligible to receive grants of Awards (as defined below) under the Inducement Plan are individuals who satisfy the standards for inducement grants under Nasdaq Marketplace Rule 5635(c)(4) or 5635(c)(3) and the related guidance under Nasdaq IM 5635-1, including individuals who were not previously an employee or director of the Company or are following a bona fide period of non-employment, in each case as an inducement material to such individual’s agreement to enter into employment with the Company. Under the Inducement Plan, an “Award” is a nonstatutory stock option, restricted stock unit or other right to receive ordinary shares pursuant to the Inducement Plan.

In June 2019, as part of the Company’s Annual Meeting of Shareholders, the Company’s Board of Directors approved grants of 70,000 options to its non-employee directors. Each then current non-employee director, including the Chairman of the Board, received a grant of 10,000 options. Each option is exercisable into one ordinary share of the Company’s stock at an exercise price of $34.83 per share. The options vest quarterly over one year and expire 10 years from grant date. The grant date fair value of these options was approximately $1.9 million.

In December 2019, the Company’s board of directors approved a modification of options and RSU's for a consultant. The Company recorded an expense of $0.9 million under general and administrative expenses with respect to options' modification. No compensation expense was taken in relation to the RSUs modification because the award vests upon a future performance condition that is not currently probable of occurring.

Options granted:

Set forth below are grants made by the Company as of December 31, 2019. The majority of options vest over three years and expire on the tenth anniversary of the date of grant.

During 2019, the Company granted 955,732 options with exercise prices ranging from $33.21 to $47.57 per share.

During 2018, the Company granted 1,195,000 options with exercise prices ranging from $38.64 to $59.23 per share.

During 2017, the Company granted 589,600 options with exercise prices ranging from $1.78 to $39.26 per share.

The fair value of options granted during 2019, 2018 and 2017 was $27.6 million, $40.3 million and $10.9 million, respectively.

The total unrecognized compensation cost of options as of December 31, 2019 is $30.8 million, which is expected to be recognized over a weighted average period of 1.72 years.

The fair value of options granted was computed using the Black-Scholes model. The underlying data used for computing the fair value of the options are as follows:

	2019	2018	2017
Value of ordinary shares	$33.21-47.57	$38.64-59.23	$1.58-39.26
Dividend yield	0%	0%	0%
Expected volatility	74.09%-80.52%	72.00%-82.04%	68.45%-76.32%
Risk-free interest rate	1.36%-2.62%	1.72%-3.07%	1.38%-2.47%
Expected term	5.8-10 years	0.2-10 years	3.9-10 years

The expected volatility is based on a mix of the Company's historical volatility and the historical volatility of comparable companies with similar attributes to the Company, including industry, stage of life cycle, size and financial leverage. The risk-free interest rate assumption is based on observed interest rates appropriate for the expected term of the options granted. The expected term is the length of time until the expected dates of exercising the options and is estimated for employees using the simplified method due to insufficient specific historical information of employees’ exercise behavior, and for non-employees, and directors using the contractual term.

The following table summarizes the number of employee and non-employee options outstanding under the Plan for the years ended December 31, 2019, 2018 and 2017, and related information:

	Number of options				Weighted Average price per share
Outstanding as of January 1, 2017		2,389,899			$	4.69
Granted		589,600		*	$	23.95
Canceled/Forfeited		(45,186	)		$	5.41
Exercised		(690,281	)		$	4.12
Outstanding as of December 31, 2017		2,244,032			$	9.91
Granted		1,195,000			$	47.19
Canceled/Forfeited		(167,149	)		$	35.37
Exercised		(748,902	)		$	8.99
Outstanding as of December 31, 2018		2,522,981			$	26.16
Granted		955,732			$	41.96
Canceled/Forfeited		(183,725	)		$	41.85
Exercised		(423,653	)		$	9.10
Outstanding as of December 31, 2019		2,871,335			$	32.93

*	Includes 9,600 ordinary shares issuable upon the vesting of options granted in 2016, which were contingent upon the closing of the IPO

The intrinsic value of stock options exercised was $14.2 million, $31.6 million, and $21.4 for the years ended December 31, 2019, 2018, and 2017, respectively.

The following table summarizes the outstanding and exercisable options as of December 31, 2019:

	Options outstanding				Options exercisable
Exercise price per share	Number of options outstanding at end of year		Weighted average remaining contractual life		Number of options exercisable at end of year		Weighted average remaining contractual life
$0.00 - 10.00		725,394		2.80		725,394		2.80
$10.01 - 20.00		75,000		7.39		63,333		7.40
$20.01 - 30.00		100,000		7.82		66,668		7.82
$30.01 - 40.00		433,500		7.78		208,331		6.33
$40.01 - 50.00		1,340,441		8.49		366,273		7.44
$50.01 - 59.23		197,000		7.94		145,000		7.80
		2,871,335				1,574,999

The aggregate intrinsic value of the total vested and exercisable options as of December 31, 2019 is $22.0 million.

The following table summarizes information about RSU activity as of December 31, 2019:

	Outstanding Restricted Stock Units
Outstanding as of January 1, 2017		275,200
Granted		123,300		*
Vested and released		(121,940	)
Forfeited		—
Outstanding as of December 31, 2017		276,560
Granted		116,493
Vested and released		(118,447	)
Forfeited		(10,907	)
Outstanding as of December 31, 2018		263,699
Granted		455,465
Vested and released		(183,975	)
Forfeited		(15,762	)
Outstanding as of December 31, 2019		519,427

*	Including 28,800 ordinary shares issuable upon the vesting of options granted in 2016, which were contingent upon the closing of the IPO

The fair value of RSUs granted during 2019, 2018 and 2017 was $19.9 million, $5.7 million, and $3.3, respectively. The total unrecognized compensation cost of RSUs as of December 31, 2019 is $16.1 million with a weighted average recognition period of 2.04 years.

The following table illustrates the effect of share-based compensation on the statements of operations:

	Year ended December 31,
	2019		2018		2017
Research and development expenses	$	8,291	$	12,038	$	3,923
General and administrative expenses		21,676		18,604		2,377
	$	29,967	$	30,642	$	6,300

Leases - Additional Information (Details) - USD ($)	1 Months Ended				12 Months Ended
Leases - Additional Information (Details) - USD ($)	Nov. 30, 2019	Oct. 31, 2019	Apr. 30, 2018	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Lessee Lease Description [Line Items]
Operating leases, existence of option to extend					true
Operating leases, options to extend lease term, description					UroGen Pharma Ltd. signed an addendum to its November 2014 lease agreement for the Company’s principal executive offices located in Israel, in order to increase the office space rented and to extend the rent period until September 2019, with an option to extend the lease for an additional period of three years. In 2019, the option was exercised, and the lease period was extended until September 2022.
Operating leases, options to extend lease term					3 years
Operating lease extended lease expiration, month and year					2022-09
Impairment losses on operating leases					$ 0
Rent expense					$ 1,200,000	$ 1,200,000	$ 600,000
Minimum
Lessee Lease Description [Line Items]
Lease expiration year					2021
Maximum
Lessee Lease Description [Line Items]
Lease expiration year					2024
UroGen Pharma Inc.
Lessee Lease Description [Line Items]
Lease commencement period, month and year				2017-10	2016-05
Lease termination period, month and year	2024-03		2024-03	2021-02
Remaining contractual obligation			$ 1,200	$ 800,000
Lease commencement date	Jan. 01, 2020	Nov. 29, 2019	Jul. 10, 2018
Rent income					$ 1,200
UroGen Pharma Inc. \| Lease Agreement
Lessee Lease Description [Line Items]
Lease term		38 months

Property and Equipment

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Property and Equipment

NOTE 6-PROPERTY AND EQUIPMENT

Property and equipment, consists of the following as of December 31, 2019 and 2018 (in thousands):

	December 31,
	2019			2018
Laboratory equipment	$	259		$	241
Computer equipment and software		416			271
Furniture		544			395
Leasehold improvements		530			561
Manufacturing equipment		226			227
		1,975			1,695
Less: accumulated depreciation and amortization		(998	)		(747	)
Property and equipment, net	$	977		$	948

Depreciation and amortization expense was $0.3 million $0.4 million and $0.2 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2019

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

NOTE 14-COMMITMENTS AND CONTINGENCIES

Grants from the Israeli Innovation Authority in Israel (“IIA”)

The Company has received grants from the IIA for research and development funding. Up until 2007, the IIA participation in the funding of the Company’s operations was as part of the Director General Directive 8.2 of Israel by grants provided to Granot Ventures. Since 2008, the funding was provided directly to Company.

The Company is committed to pay royalties to the Government of Israel on proceeds from sales of products in the research and development of which the IIA participates by way of grants. At the time the grants were received, successful development of the related projects was not assured. In the case of failure of a project that was partly financed as above, the Company is not obligated to pay any such royalties. Under the terms of the funding from the IIA, royalties of 3% to 5% are payable on sales of products developed from a project so funded, up to 100% of the amount of the grant received by the Company (dollar linked); with the addition of annual interest at a rate based on 12-month LIBOR. The Company is subject to several conditions, including restrictions on its intellectual property.

As of December 31, 2019, the maximum royalty amount payable by the Company under these funding arrangements is $2.1 million (excluding interest, and inclusive of the $0.8 million in royalties that the Company has accrued as of December 31, 2019). As of December 31, 2018, the Company has accrued $0.8 million in royalties due to the IIA, which has been recorded in cost of revenues in our results of operations for the year ended December 31, 2018. In January 2020, the IIA approved the Company’s request to unwind its obligation to the IIA as a transfer of knowledge (see Note 15).

Leases

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Leases

NOTE 7-LEASES

In April 2016, UroGen Pharma Ltd. signed an addendum to its November 2014 lease agreement for the Company’s principal executive offices located in Israel, in order to increase the office space rented and to extend the rent period until September 2019, with an option to extend the lease for an additional period of three years. In 2019, the option was exercised, and the lease period was extended until September 2022.

UroGen Pharma Inc. entered into a lease agreement for its office for a period of seven years commencing on May 1, 2016. As part of the agreement it provided the lessor with a letter of credit which renews on an annual basis. On December 1, 2018 it completed a full assignment and assumption of the lease to Allogene Therapeutics, Inc. The letter of credit was returned and there is no further liability to the Company as of December 31, 2018.

In September 2017, UroGen Pharma Inc. entered into a new lease agreement for its New York headquarters. The lease agreement commenced in October 2017 and shall terminate in February 2021. The remaining contractual obligation is approximately $0.8 million.

In April 2018, UroGen Pharma Inc. entered into a new lease agreement for an office in Los Angeles, CA. The lease commencement date was July 10, 2018 and terminates in March 2024. The contractual obligation for the remainder of the lease is $1.2 million.

In November 2019, UroGen Pharma Inc. subleased its offices in Los Angeles, CA. The lease commencement date was January 1, 2020 and terminates in March 2024. The subtenants exercised their early access clause and moved into the premises the end of November 2019. The expected rental income over the lease term is approximately $1.2 million. The Company accounts for the sublease as on operating lease in accordance with ASC 842-10-25-2 and ASC 842-10-25-3. The main lease was considered for impairment and the amount was determined to be immaterial.

Also, in November 2019, UroGen Pharma Inc. entered into a new lease agreement, dated effective October 31, 2019, for an office in Princeton, NJ. The lease commencement date was November 29, 2019 and the lease term is 38 months. The minimum lease obligation is approximately $1.7 million.

In addition, the Company has other operating office equipment and vehicle leases. The Company’s operating leases may require minimum rent payments, contingent rent payments adjusted periodically for inflation, or rent payments equal to the greater of a minimum rent or contingent rent. The Company’s leases do not contain any residual value guarantees or material restrictive covenants. The Company’s leases expire at various dates from 2021 through 2024, with varying renewal and termination options.

The components of lease cost for the year ended December 31, 2019 were as follows (in thousands):

	Year Ended December 31, 2019
Operating lease cost	$	1,243
Sublease income		(19	)
Variable lease cost		105
	$	1,329

The amounts recognized upon adoption and as of December 31, 2019 were as follows (in thousands):

	January 1, 2019		December 31, 2019
Right of use asset	$	3,022	$	3,735
Long-term lease liability		2,429		2,604
Other current liabilities		929		1,585

As of December 31, 2019, no impairment losses have been recognized to date.

Supplemental information related to leases for the periods reported is as follows (in thousands):

	Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		1,192
Right-of-use assets obtained in exchange for new operating lease liabilities		1,741
Weighted-average remaining lease term of operating leases	2.91 years
Weighted-average discount rate of operating leases	5.54%

As of December 31, 2019, maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Years ending December 31,
2020	$	1,758
2021		1,269
2022		1,101
2023		348
2024 and thereafter		58
Total future minimum lease payments	$	4,534
Less: Interest		345
Present value of lease liabilities	$	4,189

As of December 31, 2018, maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Years ending December 31,
2019	$	1,136
2020		1,251
2021		676
2022		567
2023		301
2024 and thereafter		58
Total future minimum lease payments	$	3,989

Rent expense charged to operations was $1.2 million, $1.2 million, and $0.6 million for the years ended December 31, 2019, 2018 and 2017, respectively.

Shareholders' Equity - Additional Information (Details)				1 Months Ended				12 Months Ended
Shareholders' Equity - Additional Information (Details)	Mar. 02, 2020 USD ($)	Jan. 02, 2020 USD ($)	Apr. 19, 2017 shares	Jan. 31, 2019 USD ($) $ / shares shares	Jan. 31, 2018 USD ($) $ / shares shares	May 31, 2017 USD ($) $ / shares shares	Oct. 31, 2015 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) shares	Dec. 31, 2018 USD ($) shares	Dec. 31, 2017 USD ($)	Dec. 31, 2014 $ / shares shares
Class Of Stock [Line Items]
Ordinary shares, shares authorized								100,000,000	100,000,000
Ordinary shares, issued								21,026,184	16,214,883
Ordinary shares, outstanding								21,026,184	16,214,883
Proceeds from sales \| $								$ 161,662,000	$ 64,235,000	$ 60,841,000
Research and development expenses incurred \| $								49,297,000	36,934,000	18,697,000
Cowen and Company Limited Liability Company \| Subsequent Event
Class Of Stock [Line Items]
Proceeds from sales \| $	$ 0
Cowen and Company Limited Liability Company \| Maximum \| Subsequent Event
Class Of Stock [Line Items]
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs \| $		$ 100,000,000.0
IPO
Class Of Stock [Line Items]
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs \| $								$ 161,447,000	$ 64,193,000	$ 60,772,000
Preferred A and Preferred A-1 shares into ordinary shares conversion ratio						100.00%
IPO \| NASDAQ CAPITAL MARKET
Class Of Stock [Line Items]
Issuance of ordinary shares, shares						5,144,378
Issuance of ordinary shares, price per share \| $ / shares						$ 13.00
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs \| $						$ 60,800,000
Additional ordinary shares exercised under underwriters option to purchase at the public offering price						671,005
Underwritten Public Offering
Class Of Stock [Line Items]
Issuance of ordinary shares, shares				4,207,317	1,682,926
Issuance of ordinary shares, price per share \| $ / shares				$ 41.00	$ 41.00
Issuance of ordinary shares, consideration received net of underwriting discounts and commissions and issuance costs \| $				$ 161,400,000	$ 64,200,000
Additional ordinary shares exercised under underwriters option to purchase at the public offering price				548,780	219,512
Preferred A-1 Shares \| IPO
Class Of Stock [Line Items]
Stock issued during period upon conversion of warrants, shares						364,036
Warrant exercise price per share \| $ / shares											$ 7.81
Exercisable number of warrants for preferred shares											728,312
TMX \| Intellectual Property Costs
Class Of Stock [Line Items]
Stock split description								On April 19, 2017, the Company’s board of directors and shareholders approved an aggregate 3.2 for-1 share split of the Company’s ordinary, Preferred A and Preferred A-1 shares. The share split was effected on April 19, 2017 by the issuance of 2.2 ordinary shares for each outstanding ordinary, Preferred A and Preferred A-1 share held immediately prior to the share split
Research and development expenses incurred \| $							$ 4,100,000
TMX \| Series A Preferred Shares
Class Of Stock [Line Items]
Share split conversion ratio			3.2
Issuance of ordinary shares for each outstanding ordinary, Preferred A and Preferred A-1 shares held immediately prior to share split			2.2
Purchase of IP R&D in consideration, shares							691,200
Preferred stock price per share \| $ / shares							$ 5.94

Significant Accounting Policies - Schedule of Calculation of Basic and Diluted Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic and diluted:
Loss attributable to equity holders of the Company	$ 38,973	$ 22,252	$ 22,477	$ 21,444	$ 23,716	$ 20,533	$ 18,026	$ 13,382	$ 105,146	$ 75,657	$ 20,000
Dividend accumulated for preferred shares during the period											825
Loss attributable to equity holders of the Company, after deducting dividend accumulated for preferred shares									$ 105,146	$ 75,657	$ 20,825
Weighted-average number of ordinary shares									20,528,727	15,754,193	9,716,790
Loss per ordinary share	$ 1.86	$ 1.06	$ 1.08	$ 1.11	$ 1.46	$ 1.28	$ 1.14	$ 0.88	$ 5.12	$ 4.80	$ 2.14

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Basis of Presentation and Management Plans - Addititonal Information (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Accumulated deficit	$ 228,017	$ 122,871

Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	$ 162,942	$ 89,965
Fair Value, Measurements, Recurring
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	162,942
Fair Value, Measurements, Recurring \| Money Market Funds
Assets:
Assets measured at fair value		89,965
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	83,092
Fair Value, Measurements, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money Market Funds
Assets:
Assets measured at fair value		$ 89,965
Fair Value, Measurements, Recurring \| Significant Other Observable Inputs (Level 2)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	79,850
Fair Value, Measurements, Recurring \| US Government
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	66,094
Fair Value, Measurements, Recurring \| US Government \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	66,094
Fair Value, Measurements, Recurring \| Corporate Bonds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	68,084
Fair Value, Measurements, Recurring \| Corporate Bonds \| Significant Other Observable Inputs (Level 2)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	68,084
Fair Value, Measurements, Recurring \| Commercial Paper
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	7,658
Fair Value, Measurements, Recurring \| Commercial Paper \| Significant Other Observable Inputs (Level 2)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	7,658
Fair Value, Measurements, Recurring \| Money Market Funds
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	16,998
Fair Value, Measurements, Recurring \| Money Market Funds \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	16,998
Fair Value, Measurements, Recurring \| Certification Of Deposit
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	4,108
Fair Value, Measurements, Recurring \| Certification Of Deposit \| Significant Other Observable Inputs (Level 2)
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Marketable securities:	$ 4,108

Document and Entity Information - USD ($)
$ in Millions

12 Months Ended

Dec. 31, 2019

Feb. 19, 2020

Jun. 28, 2019

Cover [Abstract]

Document Type

10-K

Amendment Flag

false

Document Period End Date

Dec. 31, 2019

Document Fiscal Year Focus

2019

Document Fiscal Period Focus

Title of 12(b) Security

Ordinary Shares, par value NIS 0.01 per share

Trading Symbol

URGN

Security Exchange Name

NASDAQ

Entity Registrant Name

UROGEN PHARMA LTD.

Entity Central Index Key

0001668243

Current Fiscal Year End Date

--12-31

Entity Well-known Seasoned Issuer

Yes

Entity Current Reporting Status

Yes

Entity Voluntary Filers

Entity Filer Category

Large Accelerated Filer

Entity Small Business

false

Entity Shell Company

false

Entity Emerging Growth Company

false

Entity Common Stock, Shares Outstanding

21,154,965

Entity Public Float

$ 695.3

Entity Interactive Data Current

Yes

Document Annual Report

true

Document Transition Report

false

Entity File Number

001-38079

Entity Incorporation, State or Country Code

Entity Tax Identification Number

98-1460746

Entity Address, Address Line One

400 Alexander Park

Entity Address, City or Town

Princeton

Entity Address, State or Province

Entity Address, Postal Zip Code

08540

City Area Code

646

Local Phone Number

768-9780

Documents Incorporated by Reference

DOCUMENTS INCORPORATED BY REFERENCE

Document Description		10-K Part
Portions of the registrant’s definitive proxy statement to be filed with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the registrant’s fiscal year ended December 31, 2019 are incorporated by reference into Part III of this report.		III

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Schedule of Deferred Income Taxes

Deferred income taxes reflect the net tax effects of temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and the amounts used for income tax purposes. Significant components of the Company and its subsidiary deferred tax assets are as follows:

	December 31,
	2019			2018			2017
In respect of:
Net operating loss carryforward	$	33,817		$	16,943		$	5,844
Deferred rent		—			61			46
Research and development expenses		4,591			3,891			2,887
Stock-based compensation		6,543			4,769			897
Issuance costs		2,063			1,367			1,261
In-process research and development		2,749			629			761
Right of use asset		(800	)		—			—
Lease Liability		896			—			—
Accrued expenses		762			598			5
Depreciation of fixed assets		(90	)		(93	)		—
Other		62			84			24
Less—valuation allowance		(50,593	)		(28,249	)		(11,725	)
Net deferred tax assets	$	—		$	—		$	—

Schedule of Change in Valuation Allowance

The change in valuation allowance for the years ended December 31, 2019, 2018 and 2017 were as follows:

	2019			2018			2017
Balance at the beginning of the year	$	(28,249	)	$	(11,725	)	$	(4,158	)
Changes during the year		(22,344	)		(16,524	)		(7,567	)
Balance at the end of the year	$	(50,593	)	$	(28,249	)	$	(11,725	)

Related Parties

12 Months Ended

Dec. 31, 2019

Related Parties

NOTE 13-RELATED PARTIES

UroGen Pharma Inc. entered into a lease agreement, dated as of November 2015 and commencing as of May 2016, for office space in New York. It shared the office space equitably with Kite Pharma, Inc., a Delaware corporation, which was a cosignatory to such lease agreement. Arie Belldegrun, M.D., the Company’s chairman, served as the Chairman and Chief Executive Officer of Kite Pharma, Inc. until his resignation effective as of October 3, 2017, in connection with the acquisition of Kite Pharma, Inc. by Gilead Sciences, Inc.

In April 2018, it terminated its lease for offices at 689 Fifth Avenue in New York, and on December 1, 2018, UroGen Pharma Inc. and Kite Pharma, Inc., completed a full assignment and assumption of the lease to Allogene Therapeutics, Inc. of which Arie Belldegrun, M.D., serves as the Chairman of the Board of Directors.

UroGen Pharma Inc. recorded a loss on disposal of fixed assets of $0.2 million for the year ended December 31, 2018, regarding accelerated depreciation on the leasehold improvements associated with the lease, and there is no further liability as of December 31, 2018.

There were no related party transactions for the year ended December 31, 2019.

CONSOLIDATED BALANCE SHEETS (Parenthetical) - ₪ / shares	Dec. 31, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Ordinary shares, par value	₪ 0.01	₪ 0.01
Ordinary shares, shares authorized	100,000,000	100,000,000
Ordinary shares, issued	21,026,184	16,214,883
Ordinary shares, outstanding	21,026,184	16,214,883

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CASH FLOWS FROM OPERATING ACTIVITIES:
Net loss	$ (105,146)	$ (75,657)	$ (20,000)
Adjustment to reconcile net loss to net cash from operating activities:
Depreciation and amortization	296	417	207
Amortization/Accretion on marketable securities	(572)
Stock-based compensation	29,967	30,642	6,300
Fair value adjustment of warrants for preferred shares			168
Realized loss on sale of short-term investment		100
Amortization of right of use asset	1,028
Change in lease liability	(910)
Changes in operating assets and liabilities:
Decrease (increase) in inventory		316	(211)
Decrease in accounts receivable			83
(Increase) decrease in prepaid expenses and other current assets	(394)	318	(562)
Increase in accounts payable and accrued expenses	2,928	4,205	2,534
(Decrease) increase in deferred revenues		(650)	650
Increase in employee related accrued expenses	1,786	2,975	1,263
Net cash used in operating activities	(71,017)	(37,334)	(9,568)
CASH FLOWS FROM INVESTING ACTIVITIES:
Sale of short-term investments		35,901
Purchase of marketable securities	(197,686)		(36,001)
Maturities of marketable securities	52,590
Change in restricted deposit	(172)	(54)	(5)
Purchase of property and equipment	(325)	(560)	(271)
Net cash (used in) provided by investing activities	(145,593)	35,287	(36,277)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from exercise of options into ordinary shares	3,664	2,401	404
Proceeds from exercise of warrants for preferred shares			382
Issuance cost for shelf filing	(76)
Issuance of ordinary shares, net of issuance expenses	161,662	64,235	60,841
Issuance cost for secondary offering		(215)	(42)
Net cash provided by financing activities	165,250	66,421	61,585
INCREASE IN CASH AND CASH EQUIVALENTS	(51,360)	64,374	15,740
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT BEGINNING OF THE YEAR	101,571	37,197	21,457
CASH, CASH EQUIVALENTS AND RESTRICTED CASH AT END OF THE YEAR	50,211	101,571	37,197
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES:
Non-cash issuance cost	188	$ 102	202
Non-cash new lease liabilities	$ 1,741
Exercise of warrants to preferred shares			$ 4,732

Significant Accounting Policies - Schedule of Interest and Other (Income) Expense, net (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Changes in fair value of warrants for preferred shares			$ 168
Interest income on cash, cash equivalents and marketable securities	$ (4,616)	$ (1,872)	(125)
Realized loss on sale of short-term investment		100
Other expense (income)	284	124	(12)
Total interest and other (income) expenses	$ (4,332)	$ (1,648)	$ 31

Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of Annual Rates of Depreciation

Annual rates of depreciation are as follows:

	%
Computers and software		33
Laboratory equipment	15-30
Furniture	6-15
Manufacturing equipment		50

Schedule of Accrued Expenses And Other Current Liabilities

Accrued expenses and other current liabilities consist of the following as of December 31, 2019 and 2018, respectively (in thousands):

	December 31, 2019		December 31, 2018
Accounts payable	$	4,694	$	4,272
Accrued clinical expenses		399		673
Accrued research and development costs		2,644		780
Accrued general and administrative expenses		2,767		1,029
Accrued other expense		682		1,786
Total accrued expenses and other current liabilities	$	11,186	$	8,540

Schedule of Interest and Other (Income) Expense, net

Interest and Other (Income) Expense, net, consisted of the following as of December 31, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2019			2018			2017
Changes in fair value of warrants for preferred shares	$	—		$	—		$	168
Interest income on cash, cash equivalents and marketable securities		(4,616	)		(1,872	)		(125	)
Realized loss on sale of short-term investment		—			100			—
Other expense (income)		284			124			(12	)
Total interest and other (income) expenses	$	(4,332	)	$	(1,648	)	$	31

Schedule of Calculation of Basic and Diluted Loss Per Share

The following table summarizes the calculation of basic and diluted loss per common share for the periods presented (in thousands, except share and per share amounts):

	Year Ended December 31,
	2019		2018		2017
Basic and diluted:
Loss attributable to equity holders of the Company	$	105,146	$	75,657	$	20,000
Dividend accumulated for preferred shares during the period	$	—	$	—	$	825
Loss attributable to equity holders of the Company, after deducting dividend accumulated for preferred shares	$	105,146	$	75,657	$	20,825
Weighted-average number of ordinary shares		20,528,727		15,754,193		9,716,790
Loss per ordinary share	$	5.12	$	4.80	$	2.14

Business and Nature of Operations - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Date of incorporation	2004-04
Date of operating commencement	2016-02

Shareholders' Equity

12 Months Ended

Dec. 31, 2019

Equity [Abstract]

Shareholders' Equity

NOTE 10-SHAREHOLDERS’ EQUITY

Ordinary Shares

The Company had 100.0 million ordinary shares authorized for issuance as of December 31, 2019 and 2018, respectively. The Company had 21.0 million and 16.2 million ordinary shares issued and outstanding as of December 31, 2019 and 2018, respectively. Each ordinary share is entitled to one vote. The holders of ordinary shares are also entitled to receive dividends whenever funds are legally available, when and if declared by the Board of Directors. Since its inception, the Company has not declared any dividends.

On April 19, 2017, the Company’s board of directors and shareholders approved an aggregate 3.2 for-1 share split of the Company’s ordinary, Preferred A and Preferred A-1 shares. The share split was effected on April 19, 2017 by the issuance of 2.2 ordinary shares for each outstanding ordinary, Preferred A and Preferred A-1 share held immediately prior to the share split.

In May 2017, the Company completed an IPO on the Nasdaq Global Market, in which it issued 5,144,378 ordinary shares, at a public offering price of $13.00 per share, in consideration for $60.8 million, net of underwriting discounts and commissions and issuance costs, including exercise of the underwriters’ option to purchase additional 671,005 ordinary shares at the IPO price.

Upon completion of the IPO, the Company converted all outstanding warrants for Preferred A-1 shares into 364,036 Preferred A-1 shares of the Company (see below). Subsequently, the Company converted all outstanding Preferred A and Preferred A-1 shares into ordinary shares at a ratio of 1:1. As of December 31, 2017, the Company’s share capital was composed entirely of ordinary shares.

In January 2018, the Company completed an underwritten public offering of 1,682,926 of its ordinary shares, including 219,512 shares sold pursuant to the full exercise of the underwriters’ option to purchase additional shares, at a price to the public of $41.00 per share. The net proceeds to the Company from the public offering were approximately $64.2 million, after deducting the underwriting discounts and commissions and payment of other offering expenses.

In January 2019, the Company completed an underwritten public offering of 4,207,317 of its ordinary shares, including 548,780 shares sold pursuant to the full exercise of the underwriters’ option to purchase additional shares, at a price to the public of $41.00 per share. The net proceeds to the Company from the offering were approximately $161.4 million, after deducting the underwriting discounts and commissions and payment of other offering expenses.

In December 2019, the Company entered into a sales agreement pursuant to which the Company may from time to time offer and sell the Company’s ordinary shares having an aggregate offering price of up to $100.0 million. The shares are offered and will be sold pursuant to the Company’s shelf registration statement on Form S-3 which was declared effective by the SEC on January 2, 2020. No sales have occurred under this agreement as of the date of this filing.

Warrants for Preferred A-1 Shares

In 2014, as part of a share purchase agreement, the Company issued warrants (the “A-1 warrants”) for preferred shares. The warrants were exercisable for Series A-1 preferred shares, in consideration for cash representing the exercise price. The A-1 warrants were measured at fair value in every reporting period, and changes in their fair value were recognized in earnings within finance expenses, net.

In connection with the completion of the IPO, the Company converted all outstanding warrants into 364,036 Preferred A-1 shares of the Company and subsequently converted all of its preferred shares, including the Preferred A-1 shares, into ordinary shares.

The Company’s warrants outstanding prior to the IPO were exercisable for Series A-1 preferred shares at an exercise price of $7.81 per share. Prior to the IPO, such warrants were exercisable for 728,312 Preferred A-1 shares.

Series A Preferred Shares

In October 2015 the Company entered into an asset purchase agreement with Telormedix SA (“TMX”) pursuant to which the Company purchased all of the intellectual property assets of TMX (in process R&D) in consideration for 691,200 Series A preferred shares of the Company at a price per share of $5.94, which were subsequently converted into ordinary shares on the date of the IPO. The Company will issue additional shares upon the occurrence of each of three milestones as set in the agreement. The Company has deemed the probability of achieving these milestones to be remote. The acquired intellectual property costs totaling $4.1 million were expensed as incurred to research and development costs in accordance with ASC 730, as the intellectual property is purchased from others for a particular research and development project and has no alternative future uses and therefore no separate economic value.

Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Schedule of Assets and Liabilities Measured at Fair Value on a Recurring Basis

Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of December 31, 2019 are as follows (in thousands):

			Fair Value Measurements Using
			Quoted Prices		Significant
			in Active		Other		Significant
	Balance as of		Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Marketable securities:
US government	$	66,094	$	66,094	$	—	$	—
Corporate bonds		68,084		—		68,084		—
Commercial paper		7,658		—		7,658		—
Money market funds⁽¹⁾		16,998		16,998		—		—
Certification of deposit		4,108		—		4,108		—
	$	162,942	$	83,092	$	79,850	$	—

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of December 31, 2018 are as follows (in thousands):

Fair Value Measurements Using

Quoted Prices

Significant

in Active

Other

Significant

Balance as of

Markets for

Observable

Unobservable

December 31,

Identical Assets

Inputs

2018

(Level 1)

(Level 2)

(Level 3)

Assets:

Money market funds⁽¹⁾

89,965

—

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

Employee Rights Upon Retirement

12 Months Ended

Dec. 31, 2019

Employee Rights Upon Retirement [Abstract]

Employee Rights Upon Retirement

NOTE 9-EMPLOYEE RIGHTS UPON RETIREMENT

In Israel, the Company is required by law to make severance payments upon dismissal of an employee or upon termination of employment in certain other circumstances.

The Company operates a number of post-employment defined contribution plans. A defined contribution plan is a program that benefits an employee after termination of employment, under which the Company regularly makes fixed payments to a separate and independent entity so that the Company has no legal or constructive obligation to pay additional contributions if the fund does not hold sufficient assets to pay all employees the benefits relating to employee service in the current and prior periods. The fund assets are not included in the Company’s financial position.

The Company operates pension and severance compensation plans subject to Section 14 of the Israeli Severance Pay Law, 5723-1963. The plans are funded through payments to insurance companies or pension funds administered by trustees. In accordance with its terms, the plans meet the definition of a defined contribution plan, as defined above.

Subsequent Events

12 Months Ended

Dec. 31, 2019

Subsequent Events [Abstract]

Subsequent Events

NOTE 15-SUBSEQUENT EVENTS

On January 2, 2020, the Company’s shelf registration statement on Form S-3 was declared effective by the SEC. As a result, the Company is permitted pursuant to its December 2019 sales agreement with Cowen and Company, LLC to offer and sell ordinary shares of stock having an aggregate offering price of up to $100.0 million pursuant to such agreement.

On January 12, 2020, the IIA Office of Chief Scientist approved the company's request to unwind its obligation to the IIA regarding grants that were loaned to the company between January 2004 and September 2016. The Company has previously reported that the repayment of these grants could be up to three-times of the original grants and other amounts. Under the approval from the IIA, the Company will be required to:

1.	Make a one-time payment in 2020, for up to three-times the grants provided (linked to Plan No. 33889) plus annual interest, net of a deduction for the royalties already paid in accordance with Appendix B of the Section 18(F) to Instructions for Benefit Track No. 1 - R&D Fund ("Benefit Track").

2.	Make a commitment to continue employment of at least 75% of its base R&D jobs in Israel (at the time of settlement) for a period of at least 3 years, in accordance with Appendix B of the Benefit Track.

The total payment under the IIA approval, net of the royalties already paid, amounts to $6.6 million plus any additional accrued interest since January 2020. The Company will pay this amount in the first quarter of 2020.

Subject to payment to the IIA to unwind the Company’s obligation, the company will have full freedom to transfer IIA-funded technology or manufacture products developed with IIA-funded technology outside of the State of Israel. Other than the commitment to continue employment, all other obligations with the IIA will also cease to exist as per the current agreement.

CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
REVENUES	$ 18	$ 1,128	$ 8,158
COST OF REVENUES		1,803	600
GROSS PROFIT (LOSS)	18	(675)	7,558
OPERATING EXPENSES:
RESEARCH AND DEVELOPMENT EXPENSES	49,297	36,934	18,697
GENERAL AND ADMINISTRATIVE EXPENSES	60,199	39,571	8,811
OPERATING LOSS	(109,478)	(77,180)	(19,950)
INTEREST AND OTHER (INCOME) EXPENSES, NET	(4,332)	(1,648)	31
LOSS BEFORE INCOME TAXES	(105,146)	(75,532)	(19,981)
INCOME TAX EXPENSE		125	19
NET LOSS	(105,146)	(75,657)	(20,000)
STATEMENTS OF COMPREHENSIVE LOSS
NET LOSS	(105,146)	(75,657)	(20,000)
OTHER COMPREHENSIVE INCOME:
UNREALIZED GAIN ON MARKETABLE SECURITIES	276
COMPREHENSIVE LOSS	$ (104,870)	$ (75,657)	$ (20,000)
LOSS PER ORDINARY SHARE BASIC AND DILUTED	$ (5.12)	$ (4.80)	$ (2.14)
WEIGHTED AVERAGE NUMBER OF SHARES OUTSTANDING USED IN COMPUTATION OF BASIC AND DILUTED LOSS PER ORDINARY SHARE	20,528,727	15,754,193	9,716,790

Share Based Compensation - Summary of Number of Options Outstanding and Exercisable (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 33.21	$ 38.64	$ 1.78
Options outstanding, exercise price per share	$ 47.57	$ 59.23	$ 39.26
Options outstanding, number of options outstanding at end of year	2,871,335
Options exercisable, number of options outstanding at end of year	1,574,999
0.00 - 10.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 0.00
Options outstanding, exercise price per share	$ 10.00
Options outstanding, number of options outstanding at end of year	725,394
Options outstanding, weighted average remaining contractual life	2 years 9 months 18 days
Options exercisable, number of options outstanding at end of year	725,394
Options exercisable, weighted average remaining contractual life	2 years 9 months 18 days
10.01 - 20.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 10.01
Options outstanding, exercise price per share	$ 20.00
Options outstanding, number of options outstanding at end of year	75,000
Options outstanding, weighted average remaining contractual life	7 years 4 months 20 days
Options exercisable, number of options outstanding at end of year	63,333
Options exercisable, weighted average remaining contractual life	7 years 4 months 24 days
20.01 - 30.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 20.01
Options outstanding, exercise price per share	$ 30.00
Options outstanding, number of options outstanding at end of year	100,000
Options outstanding, weighted average remaining contractual life	7 years 9 months 25 days
Options exercisable, number of options outstanding at end of year	66,668
Options exercisable, weighted average remaining contractual life	7 years 9 months 25 days
30.01 - 40.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 30.01
Options outstanding, exercise price per share	$ 40.00
Options outstanding, number of options outstanding at end of year	433,500
Options outstanding, weighted average remaining contractual life	7 years 9 months 10 days
Options exercisable, number of options outstanding at end of year	208,331
Options exercisable, weighted average remaining contractual life	6 years 3 months 29 days
40.01 - 50.00
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 40.01
Options outstanding, exercise price per share	$ 50.00
Options outstanding, number of options outstanding at end of year	1,340,441
Options outstanding, weighted average remaining contractual life	8 years 5 months 26 days
Options exercisable, number of options outstanding at end of year	366,273
Options exercisable, weighted average remaining contractual life	7 years 5 months 8 days
50.01 - 59.23
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Options outstanding, exercise price per share	$ 50.01
Options outstanding, exercise price per share	$ 59.23
Options outstanding, number of options outstanding at end of year	197,000
Options outstanding, weighted average remaining contractual life	7 years 11 months 8 days
Options exercisable, number of options outstanding at end of year	145,000
Options exercisable, weighted average remaining contractual life	7 years 9 months 18 days

Income Taxes

12 Months Ended

Dec. 31, 2019

Income Tax Disclosure [Abstract]

Income Taxes

NOTE 12-INCOME TAXES

The Company is taxed under Israeli tax laws:

Corporate tax rate

Presented hereunder are the Israeli tax rates relevant to the Company:

2017 – 24%

2018 and thereafter– 23%

Current taxes for the reported periods are calculated according to the tax rates presented above.

Income Tax Regulations (Rules on Bookkeeping by Foreign Invested Companies and Certain Partnerships and Determination of their Taxable Income), 1986:

As a "Controller Foreign Cooperation" (as defined in the Israeli Law for the Encouragement of Capital Investments-1959), the Company's management has elected to apply Income Tax Regulations (Rules for Maintaining Accounting Records of Foreign Invested Companies and Certain Partnerships and Determining Their Taxable Income) – 1986, from January 2018. Accordingly, its taxable income or loss is calculated in US Dollars.

Law for the Encouragement of Industry (Taxation), 1969:

The Company is an “Industrial Company” under the Law for the Encouragement of Industry (Taxation), 1969 and, therefore, is entitled to certain tax benefits, mainly as follows:

•

Amortization in three equal annual portions of issuance expenses when registering shares for trading as from the date the shares of the company were registered.

•

An 8-year period of amortization for acquired patents and know-how used in the process of development performed by the enterprise.

Deferred income taxes:

	December 31,
	2019			2018			2017
In respect of:
Net operating loss carryforward	$	33,817		$	16,943		$	5,844
Deferred rent		—			61			46
Research and development expenses		4,591			3,891			2,887
Stock-based compensation		6,543			4,769			897
Issuance costs		2,063			1,367			1,261
In-process research and development		2,749			629			761
Right of use asset		(800	)		—			—
Lease Liability		896			—			—
Accrued expenses		762			598			5
Depreciation of fixed assets		(90	)		(93	)		—
Other		62			84			24
Less—valuation allowance		(50,593	)		(28,249	)		(11,725	)
Net deferred tax assets	$	—		$	—		$	—

The change in valuation allowance for the years ended December 31, 2019, 2018 and 2017 were as follows:

	2019			2018			2017
Balance at the beginning of the year	$	(28,249	)	$	(11,725	)	$	(4,158	)
Changes during the year		(22,344	)		(16,524	)		(7,567	)
Balance at the end of the year	$	(50,593	)	$	(28,249	)	$	(11,725	)

The main reconciling item between the statutory tax rates of the Company and the effective rate is the share-based compensation and provision for full valuation allowance in respect of tax benefits from carryforward tax losses due to the uncertainty of the realization of such tax benefits.

Regarding the Company’s U.S. operations, as of December 31, 2019, UroGen Pharma Inc. had federal tax net operating losses of $2.6 million and state tax net operating losses of $0.6 million in several jurisdictions available to carryforward and reduce future income tax liabilities. The federal and state net operating losses begin to expire after 2036.

The Internal Revenue Code contains provisions that may limit our use of federal net operating loss carryforwards if significant changes occur in the constructive stock ownership of UroGen Pharma Inc. In the event it has had an “ownership change” within the meaning of Section 382 of the Code, utilization of its net operating loss carryforwards could be restricted under Section 382 of the Code and similar state provisions. Such limitations could result in the expiration of the net operating carryforwards incurred before 2018 before their utilization. In addition, under the Tax Act, federal net operating losses incurred in 2018 and in future years may be carried forward indefinitely, but the deductibility of such federal net operating losses is limited.

Losses for tax purposes carried forward to future years

As of December 31, 2019, and December 31, 2018, the Company had approximately $151.9 million and $72.1 million of net carryforward tax losses, respectively, available to reduce future taxable income without limitation of use.

Tax assessments

UroGen Pharma Ltd, has received final tax assessments up to and including its 2013 tax year.

Share Based Compensation - Schedule of Effect of Share-Based Compensation on Statements of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation	$ 29,967	$ 30,642	$ 6,300
Research and Development Expenses
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation	8,291	12,038	3,923
General and Administrative Expenses
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Share-based compensation	$ 21,676	$ 18,604	$ 2,377

Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2019

Property Plant And Equipment [Abstract]

Schedule of Property and Equipment

Property and equipment, consists of the following as of December 31, 2019 and 2018 (in thousands):

	December 31,
	2019			2018
Laboratory equipment	$	259		$	241
Computer equipment and software		416			271
Furniture		544			395
Leasehold improvements		530			561
Manufacturing equipment		226			227
		1,975			1,695
Less: accumulated depreciation and amortization		(998	)		(747	)
Property and equipment, net	$	977		$	948

Basis of Presentation and Management Plans

12 Months Ended

Dec. 31, 2019

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Basis of Presentation and Management Plans

NOTE 2-BASIS OF PRESENTATION AND MANAGEMENT PLANS

The Company has not generated any revenue from the sale of products since its inception. The Company has experienced net losses since its inception and has an accumulated deficit of $228.0 million and $122.9 million as of December 31, 2019 and 2018, respectively. The Company expects to incur losses and have negative net cash flows from operating activities as it expands its portfolio and engages in further research and development activities, particularly conducting nonclinical studies and clinical trials.

The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States.

The success of the Company depends on its ability to develop its technologies to the point of U.S. Food and Drug Administration (“FDA”) approval and subsequent revenue generation or through the sale, merger, or other transfer of all or substantially all of the Company’s assets and, accordingly, to raise enough capital to finance these developmental efforts. In the future, management will need to raise additional capital to finance the continued operating and capital requirements of the Company. Any amounts raised will be used to further develop the Company’s technologies, acquire additional product licenses and for other working capital purposes. There can be no assurances that the Company will be able to secure such additional financing, or if available, that it will be sufficient to meet its needs. If the Company cannot obtain adequate working capital, it will be forced to reevaluate its planned business operations.

Fair Value Measurements

12 Months Ended

Dec. 31, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

NOTE 4-FAIR VALUE MEASUREMENTS

The Company follows authoritative accounting guidance, which among other things, defines fair value, establishes a consistent framework for measuring fair value and expands disclosure for each major asset and liability category measured at fair value on either a recurring or nonrecurring basis. Fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. As such, fair value is a market-based measurement that should be determined based on assumptions that market participants would use in pricing an asset or liability.

As a basis for considering such assumptions, a three-tier fair value hierarchy has been established, which prioritizes the inputs used in measuring fair value as follows:

Level 1: Observable inputs such as quoted prices (unadjusted) in active markets for identical assets or liabilities.

Level 2: Inputs other than quoted prices that are observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets and quoted prices for identical or similar assets or liabilities in markets that are not active.

Level 3: Unobservable inputs that reflect the reporting entity’s own assumptions.

The carrying amounts of the Company’s other current assets, accounts payable and accrued liabilities are generally considered to be representative of their fair value because of the short-term nature of these instruments. No transfers between levels have occurred during the periods presented.

Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of December 31, 2019 are as follows (in thousands):

			Fair Value Measurements Using
			Quoted Prices		Significant
			in Active		Other		Significant
	Balance as of		Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Marketable securities:
US government	$	66,094	$	66,094	$	—	$	—
Corporate bonds		68,084		—		68,084		—
Commercial paper		7,658		—		7,658		—
Money market funds⁽¹⁾		16,998		16,998		—		—
Certification of deposit		4,108		—		4,108		—
	$	162,942	$	83,092	$	79,850	$	—

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

Assets and liabilities measured at fair value on a recurring basis based on Level 1, Level 2, and Level 3 fair value measurement criteria as of December 31, 2018 are as follows (in thousands):

Fair Value Measurements Using

Quoted Prices

Significant

in Active

Other

Significant

Balance as of

Markets for

Observable

Unobservable

December 31,

Identical Assets

Inputs

2018

(Level 1)

(Level 2)

(Level 3)

Assets:

Money market funds⁽¹⁾

89,965

—

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

The Company’s investments in money market funds are valued based on publicly available quoted market prices for identical securities as of December 31, 2019 and 2018.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Share Based Compensation - Summary of Information about RSU Activity (Details) - Restricted Stock Units (RSUs) - shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Outstanding beginning balance	263,699	276,560	275,200
Granted	455,465	116,493	123,300
Vested and released	(183,975)	(118,447)	(121,940)
Forfeited	(15,762)	(10,907)
Number of Options, Outstanding ending balance	519,427	263,699	276,560

Property and Equipment - Schedule of Property and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment	$ 1,975	$ 1,695
Less: accumulated depreciation and amortization	(998)	(747)
Property and equipment, net	977	948
Laboratory Equipment
Property Plant And Equipment [Line Items]
Property and equipment	259	241
Computers and Software
Property Plant And Equipment [Line Items]
Property and equipment	416	271
Furniture
Property Plant And Equipment [Line Items]
Property and equipment	544	395
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment	530	561
Manufacturing Equipment
Property Plant And Equipment [Line Items]
Property and equipment	$ 226	$ 227

Leases (Tables)

12 Months Ended

Dec. 31, 2019

Leases [Abstract]

Components of Lease Cost

The components of lease cost for the year ended December 31, 2019 were as follows (in thousands):

	Year Ended December 31, 2019
Operating lease cost	$	1,243
Sublease income		(19	)
Variable lease cost		105
	$	1,329

Schedule of Amounts Recognized Upon Adoption

The amounts recognized upon adoption and as of December 31, 2019 were as follows (in thousands):

	January 1, 2019		December 31, 2019
Right of use asset	$	3,022	$	3,735
Long-term lease liability		2,429		2,604
Other current liabilities		929		1,585

Schedule of Supplemental Information Related to Leases

Supplemental information related to leases for the periods reported is as follows (in thousands):

	Year Ended December 31, 2019
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases		1,192
Right-of-use assets obtained in exchange for new operating lease liabilities		1,741
Weighted-average remaining lease term of operating leases	2.91 years
Weighted-average discount rate of operating leases	5.54%

Schedule of Maturities of Lease Liabilities

As of December 31, 2019, maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Years ending December 31,
2020	$	1,758
2021		1,269
2022		1,101
2023		348
2024 and thereafter		58
Total future minimum lease payments	$	4,534
Less: Interest		345
Present value of lease liabilities	$	4,189

Schedule of Maturities of Lease Liabilities

As of December 31, 2018, maturities of lease liabilities were as follows (in thousands):

	Operating Leases
Years ending December 31,
2019	$	1,136
2020		1,251
2021		676
2022		567
2023		301
2024 and thereafter		58
Total future minimum lease payments	$	3,989

Share Based Compensation - Summary of Number of Employee and Non-employee Options Outstanding Under the Plan (Details) - $ / shares	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Granted	955,732	1,195,000	589,600
Employees and Non-employees
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Options, Outstanding beginning balance	2,522,981	2,244,032	2,389,899
Number of Options, Granted	955,732	1,195,000	589,600
Number of Options, Canceled/Forfeited	(183,725)	(167,149)	(45,186)
Number of Options, Exercised	(423,653)	(748,902)	(690,281)
Number of Options, Outstanding ending balance	2,871,335	2,522,981	2,244,032
Weighted Average Price Per Share, Outstanding beginning balance	$ 26.16	$ 9.91	$ 4.69
Weighted Average Price Per Share, Granted	41.96	47.19	23.95
Weighted Average Price Per Share, Canceled/Forfeited	41.85	35.37	5.41
Weighted Average Price Per Share, Exercised	9.10	8.99	4.12
Weighted Average Price Per Share, Outstanding ending balance	$ 32.93	$ 26.16	$ 9.91

Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Summary of Marketable Securities

The following table summarizes the Company’s marketable securities as of December 31, 2019 (in thousands):

	Amortized Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Marketable securities:
US government	$	65,947	$	147	$	—		$	66,094
Corporate bonds		67,957		131		(4	)		68,084
Commercial paper		7,658		—		—			7,658
Money market funds⁽¹⁾		16,998		—		—			16,998
Certificates of deposit		4,106		2		—			4,108
	$	162,666	$	280	$	(4	)	$	162,942

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

Summary of Fair Values of Marketable Securities by Contractual Maturity

The fair values of marketable securities by contractual maturity consist of the following (in thousands):

	December 31, 2019		December 31, 2018
Maturities within one year	$	114,386	$	89,965
Maturities after one year through three years		48,556		—
	$	162,942	$	89,965

CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($)
IPO
Shares issuance expense and underwriters discounts	$ 6,105

Fair Value Measurements - Additional Information (Details)	12 Months Ended
	Dec. 31, 2019 USD ($)
Fair Value Disclosures [Abstract]
Fair value assets, transfers between level 1 to level 2	$ 0
Fair value assets, transfers between level 2 to level 1	0
Fair value liabilities, transfers between level 1 to level 2	0
Fair value liabilities, transfers between level 2 to level 1	0
Fair value assets, transfers into level 3	0
Fair value assets, transfers out of level 3	0
Fair value liabilities, transfers into level 3	0
Fair value liabilities, transfers out of level 3	$ 0

Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2019

Quarterly Financial Information Disclosure [Abstract]

Summarized Quarterly Data

	2019
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Total revenues	$	—		$	18		$	—		$	—		$	18
Total operating expenses	$	22,433		$	23,771		$	23,453		$	39,839		$	109,496
Loss from operations	$	(22,433	)	$	(23,753	)	$	(23,453	)	$	(39,839	)	$	(109,478	)
Net loss attributable to common shareholders	$	(21,444	)	$	(22,477	)	$	(22,252	)	$	(38,973	)	$	(105,146	)
Net loss per share attributable to common shareholders - basic and diluted	$	(1.11	)	$	(1.08	)	$	(1.06	)	$	(1.86	)	$	(5.12	)

	2018
	First Quarter			Second Quarter			Third Quarter			Fourth Quarter			Total
Total revenues	$	481		$	364		$	283		$	—		$	1,128
Total operating expenses	$	13,691		$	18,480		$	20,317		$	24,017		$	76,505
Loss from operations	$	(13,640	)	$	(18,434	)	$	(21,089	)	$	(24,017	)	$	(77,180	)
Net loss attributable to common shareholders	$	(13,382	)	$	(18,026	)	$	(20,533	)	$	(23,716	)	$	(75,657	)
Net loss per share attributable to common shareholders - basic and diluted	$	(0.88	)	$	(1.14	)	$	(1.28	)	$	(1.46	)	$	(4.80	)

Marketable Securities - Summary of Marketable Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Marketable securities:
Amortized Cost Basis	$ 162,666
Unrealized Gains	280
Unrealized Losses	(4)
Fair Value	162,942	$ 89,965
US Government
Marketable securities:
Amortized Cost Basis	65,947
Unrealized Gains	147
Fair Value	66,094
Corporate Bonds
Marketable securities:
Amortized Cost Basis	67,957
Unrealized Gains	131
Unrealized Losses	(4)
Fair Value	68,084
Commercial Paper
Marketable securities:
Amortized Cost Basis	7,658
Fair Value	7,658
Money Market Funds
Marketable securities:
Amortized Cost Basis	16,998
Fair Value	16,998
Certificates of Deposit
Marketable securities:
Amortized Cost Basis	4,106
Unrealized Gains	2
Fair Value	$ 4,108

Related Parties - Additional Information (Details) - USD ($)	1 Months Ended	12 Months Ended
	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018
Related Party Transaction [Line Items]
Operating lease liabilities		$ 4,189,000
UroGen Pharma Inc.
Related Party Transaction [Line Items]
Lease agreement period, month and year		2015-11
Lease commencement period, month and year	2017-10	2016-05
Gain (loss) on disposal of fixed assets			$ 200,000
Operating lease liabilities			$ 0

Significant Accounting Policies - Additional Information (Details)			3 Months Ended					12 Months Ended
	Nov. 08, 2019 USD ($)	Oct. 07, 2016 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Jun. 30, 2018 USD ($)	Mar. 31, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2019 USD ($) Obligation	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2019 USD ($)
Summary Of Significant Accounting Policy [Line Items]
Operating lease Right-of-Use assets								$ 3,735,000				$ 3,022,000
Operating lease liabilities								$ 4,189,000
Number of performance obligation \| Obligation								2
Upfront fee allocated to license component								$ 17,500,000
Revenues			$ 18,000	$ 283,000	$ 364,000	$ 481,000		18,000	$ 1,128,000	$ 8,158,000
Agenus Agreement
Summary Of Significant Accounting Policy [Line Items]
Upfront fee	$ 10,000,000.0
Maximum amount payable upon achieving certain clinical development and regulatory milestones	115,000,000.0
Maximum amount payable upon achieving certain commercial milestones	$ 85,000,000.0
Agenus Agreement \| Minimum
Summary Of Significant Accounting Policy [Line Items]
Royalty ranging on net sales of licensed products	14.00%
Agenus Agreement \| Maximum
Summary Of Significant Accounting Policy [Line Items]
Royalty ranging on net sales of licensed products	20.00%
Allergan
Summary Of Significant Accounting Policy [Line Items]
Consideration received for license and future supply services		$ 17,500,000									$ 17,500,000
Milestone payment for licensing agreement							$ 7,500,000			7,500,000
Revenues								$ 18,000	$ 1,100,000	$ 700,000
Type Of Revenue Extensible List								urgn:RTGelMember	urgn:RTGelMember	urgn:RTGelMember
Accounting Standards Update 2016-02
Summary Of Significant Accounting Policy [Line Items]
Operating lease Right-of-Use assets												3,700,000
Operating lease liabilities												$ 4,200,000

Leases - Schedule of Supplemental Information Related to Leases (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	$ 1,192
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 1,741
Weighted-average remaining lease term of operating leases	2 years 10 months 28 days
Weighted-average discount rate of operating leases	5.54%

Income Taxes - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Tax [Line Items]
Corporate tax rate	23.00%	23.00%	24.00%
Federal tax net operating losses carryforward	$ 2.6
State tax net operating losses carryforward	$ 0.6
Federal and state net operating losses expiration year	2036
Net carryforward tax losses	$ 151.9	$ 72.1
Patents
Income Tax [Line Items]
Acquired intangible asset amortization period	8 years

Significant Accounting Policies

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Significant Accounting Policies

NOTE 3-SIGNIFICANT ACCOUNTING POLICIES

Principles of Consolidation

The Company’s consolidated financial statements include the accounts of its subsidiary, UroGen Pharma Inc. Intercompany balances and transactions have been eliminated during consolidation.

Use of Estimates

Functional Currency

Cash and Cash Equivalents

Marketable Securities

Concentration of Credit Risk

Income Taxes

Property and Equipment

Annual rates of depreciation are as follows:

	%
Computers and software		33
Laboratory equipment	15-30
Furniture	6-15
Manufacturing equipment		50

Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or lease terms. See Note 6 for further discussion regarding property and equipment.

Leases

The Company is a lessee in several noncancelable operating leases, primarily for office space, office equipment and vehicles. The Company currently has no finance leases.

The Company has lease agreements with lease and non-lease components and has elected the practical expedient to combine lease and non-lease components for all underlying classes of assets.

Accounts Payable and Accrued Expenses

Accrued expenses and other current liabilities consist of the following as of December 31, 2019 and 2018, respectively (in thousands):

	December 31, 2019		December 31, 2018
Accounts payable	$	4,694	$	4,272
Accrued clinical expenses		399		673
Accrued research and development costs		2,644		780
Accrued general and administrative expenses		2,767		1,029
Accrued other expense		682		1,786
Total accrued expenses and other current liabilities	$	11,186	$	8,540

Revenues

Under ASC 606, in determining the appropriate amount of revenue to be recognized as it fulfills its obligations under the agreements with Allergan, the Company performs the following steps:

Identification of the contract;

Determination of whether the promised goods or services are performance obligations including whether they are distinct in the context of the contract;

Measurement of the transaction price, including the constraint on variable consideration;

Allocation of the transaction price to the performance obligations;

Recognition of revenue when or as the Company satisfies each performance obligation.

In an arrangement with multiple goods and services, a good or service that is promised to a customer shall be considered a separate performance obligation if all of the following criteria are met:

Allocating the Consideration in the Arrangement

Development and Regulatory Milestone Payments

Royalties Based on Allergan’s Revenue

The Company is also entitled to royalties based on Allergan’s revenue from its product and recognize revenue related to the sales-base royalty when the related sales occur,

Supply of RTGel to Allergan

Shipping and handling costs associated with supply of RTGel vials are accounted for as a fulfillment cost and are in included in cost of revenues.

General and Administrative Expenses

Research and Development

Share-Based Compensation

Interest and Other (Income) Expense, net

Interest and Other (Income) Expense, net, consisted of the following as of December 31, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2019			2018			2017
Changes in fair value of warrants for preferred shares	$	—		$	—		$	168
Interest income on cash, cash equivalents and marketable securities		(4,616	)		(1,872	)		(125	)
Realized loss on sale of short-term investment		—			100			—
Other expense (income)		284			124			(12	)
Total interest and other (income) expenses	$	(4,332	)	$	(1,648	)	$	31

Net Loss per Common Share

For all periods presented, potentially dilutive securities are excluded from the computation of fully diluted loss per share as their effect is anti-dilutive.

The following table summarizes the calculation of basic and diluted loss per common share for the periods presented (in thousands, except share and per share amounts):

	Year Ended December 31,
	2019		2018		2017
Basic and diluted:
Loss attributable to equity holders of the Company	$	105,146	$	75,657	$	20,000
Dividend accumulated for preferred shares during the period	$	—	$	—	$	825
Loss attributable to equity holders of the Company, after deducting dividend accumulated for preferred shares	$	105,146	$	75,657	$	20,825
Weighted-average number of ordinary shares		20,528,727		15,754,193		9,716,790
Loss per ordinary share	$	5.12	$	4.80	$	2.14

Recently Issued Accounting Pronouncements

Recently Adopted Accounting Pronouncements

Significant Accounting Policies - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
Accounts payable	$ 4,694	$ 4,272
Accrued clinical expenses	399	673
Accrued research and development costs	2,644	780
Accrued general and administrative expenses	2,767	1,029
Accrued other expense	682	1,786
Total accrued expenses and other current liabilities	$ 11,186	$ 8,540

Income Taxes - Schedule of Change in Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Valuation Allowance [Abstract]
Balance at the beginning of the year	$ (28,249)	$ (11,725)	$ (4,158)
Changes during the year	(22,344)	(16,524)	(7,567)
Balance at the end of the year	$ (50,593)	$ (28,249)	$ (11,725)

Share-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2019

Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]

Schedule of Fair Value of Options Granted

The fair value of options granted was computed using the Black-Scholes model. The underlying data used for computing the fair value of the options are as follows:

	2019	2018	2017
Value of ordinary shares	$33.21-47.57	$38.64-59.23	$1.58-39.26
Dividend yield	0%	0%	0%
Expected volatility	74.09%-80.52%	72.00%-82.04%	68.45%-76.32%
Risk-free interest rate	1.36%-2.62%	1.72%-3.07%	1.38%-2.47%
Expected term	5.8-10 years	0.2-10 years	3.9-10 years

Summary of Number of Employee and Non-employee Options Outstanding Under the Plan

The following table summarizes the number of employee and non-employee options outstanding under the Plan for the years ended December 31, 2019, 2018 and 2017, and related information:

	Number of options				Weighted Average price per share
Outstanding as of January 1, 2017		2,389,899			$	4.69
Granted		589,600		*	$	23.95
Canceled/Forfeited		(45,186	)		$	5.41
Exercised		(690,281	)		$	4.12
Outstanding as of December 31, 2017		2,244,032			$	9.91
Granted		1,195,000			$	47.19
Canceled/Forfeited		(167,149	)		$	35.37
Exercised		(748,902	)		$	8.99
Outstanding as of December 31, 2018		2,522,981			$	26.16
Granted		955,732			$	41.96
Canceled/Forfeited		(183,725	)		$	41.85
Exercised		(423,653	)		$	9.10
Outstanding as of December 31, 2019		2,871,335			$	32.93

*	Includes 9,600 ordinary shares issuable upon the vesting of options granted in 2016, which were contingent upon the closing of the IPO

Summary of Number of Options Outstanding and Exercisable

The following table summarizes the outstanding and exercisable options as of December 31, 2019:

	Options outstanding				Options exercisable
Exercise price per share	Number of options outstanding at end of year		Weighted average remaining contractual life		Number of options exercisable at end of year		Weighted average remaining contractual life
$0.00 - 10.00		725,394		2.80		725,394		2.80
$10.01 - 20.00		75,000		7.39		63,333		7.40
$20.01 - 30.00		100,000		7.82		66,668		7.82
$30.01 - 40.00		433,500		7.78		208,331		6.33
$40.01 - 50.00		1,340,441		8.49		366,273		7.44
$50.01 - 59.23		197,000		7.94		145,000		7.80
		2,871,335				1,574,999

Summary of Information about RSU Activity

The following table summarizes information about RSU activity as of December 31, 2019:

	Outstanding Restricted Stock Units
Outstanding as of January 1, 2017		275,200
Granted		123,300		*
Vested and released		(121,940	)
Forfeited		—
Outstanding as of December 31, 2017		276,560
Granted		116,493
Vested and released		(118,447	)
Forfeited		(10,907	)
Outstanding as of December 31, 2018		263,699
Granted		455,465
Vested and released		(183,975	)
Forfeited		(15,762	)
Outstanding as of December 31, 2019		519,427

*	Including 28,800 ordinary shares issuable upon the vesting of options granted in 2016, which were contingent upon the closing of the IPO

Schedule of Effect of Share-Based Compensation on Statements of Operations

The following table illustrates the effect of share-based compensation on the statements of operations:

	Year ended December 31,
	2019		2018		2017
Research and development expenses	$	8,291	$	12,038	$	3,923
General and administrative expenses		21,676		18,604		2,377
	$	29,967	$	30,642	$	6,300

Marketable Securities

12 Months Ended

Dec. 31, 2019

Investments Debt And Equity Securities [Abstract]

Marketable Securities

NOTE 5-MARKETABLE SECURITIES

The following table summarizes the Company’s marketable securities as of December 31, 2019 (in thousands):

	Amortized Cost Basis		Unrealized Gains		Unrealized Losses			Fair Value
Marketable securities:
US government	$	65,947	$	147	$	—		$	66,094
Corporate bonds		67,957		131		(4	)		68,084
Commercial paper		7,658		—		—			7,658
Money market funds⁽¹⁾		16,998		—		—			16,998
Certificates of deposit		4,106		2		—			4,108
	$	162,666	$	280	$	(4	)	$	162,942

⁽¹⁾	Included within cash and cash equivalents on the Company’s consolidated balance sheets.

The Company classifies its marketable securities as available-for-sale, and they consist of all debt securities. As of December 31, 2019, they were in a net unrealized gain position of $0.3 million. Unrealized gains and losses on available-for-sale debt securities are included as a component of comprehensive loss.

As of December 31, 2019, the aggregate fair value of marketable securities held by the Company in an unrealized loss position was $17.9 million, which consisted of 17 securities. No securities have been in an unrealized loss position for more than 12 months.

As of December 31, 2019 and 2018, the Company considered the decreases in market value on its marketable securities to be temporary in nature and did not consider any of the Company’s investments to be other-than-temporarily impaired.

The Company’s marketable securities as of December 31, 2019 mature at various dates through November 2021. The fair values of marketable securities by contractual maturity consist of the following (in thousands):

	December 31, 2019		December 31, 2018
Maturities within one year	$	114,386	$	89,965
Maturities after one year through three years		48,556		—
	$	162,942	$	89,965

Marketable Securities - Additional Information (Details) $ in Millions	Dec. 31, 2019 USD ($) Security
Investments Debt And Equity Securities [Abstract]
Available-for-sale debt securities, unrealized gain position \| $	$ 0.3
Available-for-sale debt securities, unrealized loss position \| $	$ 17.9
Available-for-sale debt securities, number of securities in unrealized loss position \| Security	17
Available-for-sale debt securities, number of securities in unrealized loss position for more than 12 months \| Security	0