| Document and Entity Information | Mar. 18, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001668243 |
| Document Type | 8-K |
| Document Period End Date | Mar. 18, 2021 |
| Entity Registrant Name | UROGEN PHARMA LTD. |
| Entity Incorporation State Country Code | L3 |
| Entity File Number | 001-38079 |
| Entity Tax Identification Number | 98-1460746 |
| Entity Address, Address Line One | 400 Alexander Park Drive |
| Entity Address, Address Line Two | 4th Floor |
| Entity Address, City or Town | Princeton |
| Entity Address, State or Province | NJ |
| Entity Address, Postal Zip Code | 08540 |
| City Area Code | +1 (646) |
| Local Phone Number | 768-9780 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Ordinary Shares, par value NIS0.01 per share |
| Trading Symbol | URGN |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
