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Leases - Additional Information (Details) - USD ($) | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Nov. 30, 2019 | Apr. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2020 | Sep. 30, 2020
Lessee Lease Description [Line Items] |  |  |  |  |
Operating leases, existence of option to extend |  |  |  |  | true
Operating leases, options to extend lease term, description |  |  |  |  | UPL signed an addendum to its November 2014 lease agreement for the Company’s executive offices located in Israel, in order to increase the office space rented and to extend the rent period until 2019. In March 2019, UPL utilized the agreement extension option and extended the rent period for additional three years until August 2022.
Operating leases, options to extend lease term |  |  |  | 3 years | 3 years
Operating lease extended lease expiration, month and year |  |  |  |  | 2022-08
Remaining rental payments to be received over the lease term |  |  |  | $ 56,000 | $ 168,000
Impairment losses on operating leases |  |  |  |  | $ 0
Minimum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease expiration year |  |  |  |  | 2021
Maximum |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease expiration year |  |  |  |  | 2023
UroGen Pharma Inc. | New York |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease commencement period, month and year |  |  | 2017-10 |  |
Lease termination period, month and year |  |  | 2021-02 |  |
Remaining contractual obligation |  |  |  | 300,000 | $ 300,000
UroGen Pharma Inc. | Los Angeles, California |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Lease termination period, month and year |  | 2024-03 |  |  |
Remaining contractual obligation |  |  |  | 1,000,000.0 | 1,000,000.0
Lease commencement date |  | Jul. 10, 2018 |  |  |
Proceeds from tenant allowance |  | $ 200,000 |  |  |
Lessee operating sublease commencement date | Jan. 01, 2020 |  |  |  |
Lessee operating sublease termination period, month and year | 2024-03 |  |  |  |
Remaining rental payments to be received over the lease term |  |  |  |  | 800,000
UroGen Pharma Inc. | Princeton, NJ | Lease Agreement |  |  |  |  |
Lessee Lease Description [Line Items] |  |  |  |  |
Remaining contractual obligation |  |  |  | $ 1,300,000 | $ 1,300,000
Lease commencement date | Nov. 29, 2019 |  |  |  |
Lease term | 38 months |  |  |  |

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