Document and Entity Information - shares
6 Months Ended
Jun. 30, 2019
Aug. 05, 2019
Document And Entity Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Jun. 30, 2019  
Document Fiscal Year Focus 2019  
Document Fiscal Period Focus Q2  
Trading Symbol URGN  
Entity Registrant Name UroGen Pharma Ltd.  
Entity Central Index Key 0001668243  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Common Stock, Ordinary Shares Outstanding   20,897,813
Entity Shell Company false  
Entity Current Reporting Status Yes  
Entity File Number 001-38079  
Entity Tax Identification Number 981460746  
Entity Address, Address Line One 499 Park Ave  
Entity Address, City or Town New York  
Entity Address, State or Province New York  
Entity Address, Postal Zip Code 10004  
City Area Code 646  
Local Phone Number 768-9780