| Document and Entity Information | Sep. 24, 2019 |
| Cover [Abstract] | |
| Entity Registrant Name | UroGen Pharma Ltd. |
| Title of 12(b) Security | Ordinary Shares, par value NIS0.01 per share |
| Entity Tax Identification Number | 98-1460746 |
| Amendment Flag | false |
| Entity Central Index Key | 0001668243 |
| Document Type | 8-K |
| Document Period End Date | Sep. 24, 2019 |
| Entity Incorporation, State or Country Code | L3 |
| Entity File Number | 001-38079 |
| Entity Address, Address Line One | 499 Park Avenue |
| Entity Address, City or Town | New York |
| Entity Address, State or Province | NY |
| Entity Address, Postal Zip Code | 10014 |
| City Area Code | 646 |
| Local Phone Number | 768-9780 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Trading Symbol | URGN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
