Business and Nature of Operations	3 Months Ended
Mar. 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 (“UPL”). UroGen Pharma Inc., a subsidiary of UPL, was incorporated in Delaware in October 2015 and began operating in February 2016 (“UPI”). UPL and UPI (together the “Company”) is a clinical stage biopharmaceutical company focused on developing novel therapies designed to change the standard of care for urological pathologies. Since commencing operations, the Company has devoted substantially all of its efforts to securing intellectual property rights, performing research and development activities, including conducting clinical trials and manufacturing activities, hiring personnel, preparing for the potential commercial launch of its lead product candidates, UGN-101 and UGN-102, and raising capital to support and expand these activities.

The entire disclosure for the nature of an entity's business, major products or services, principal markets including location, and the relative importance of its operations in each business and the basis for the determination, including but not limited to, assets, revenues, or earnings. For an entity that has not commenced principal operations, disclosures about the risks and uncertainties related to the activities in which the entity is currently engaged and an understanding of what those activities are being directed toward.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=99393423&loc=d3e5967-108592

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 275
-URI http://asc.fasb.org/topic&trid=2134479

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