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Commitment and Contingencies - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 8 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
May 01, 2016 | Apr. 30, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Rent expenses |  |  |  |  | $ 276 | $ 218 | $ 121
Future minimum lease payments, 2018 |  |  | $ 1,115 |  | 1,115 |  |
Future minimum lease payments, 2019 |  |  | 1,054 |  | 1,054 |  |
Future minimum lease payments, 2020 |  |  | 873 |  | 873 |  |
Future minimum lease payments, 2021 |  |  | 305 |  | 305 |  |
Future minimum lease payments, 2022 |  |  | 192 |  | 192 |  |
Future minimum lease payments, 2023 |  |  | $ 80 |  | 80 |  |
Success fees to third parties in stock options |  |  |  |  |  | 5,726 |
Fair value of stock options issued to third parties |  |  |  |  |  | $ 9 |
Success fees to third parties in cash |  |  |  |  | 28 |  |
UroGen Pharma Inc. |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Rent expenses |  |  |  | $ 102 | $ 342 |  |
Lease agreement period | 7 years |  |  |  |  |  |
Lease agreement, commencement period |  |  | 2017-10 |  |  |  |
Lease agreement, termination period |  |  | 2021-02 |  |  |  |
Minimum [Member] | IIA |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty fees payable on product sales, percentage |  |  |  |  | 3.00% |  |
Maximum |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Lease expiration year |  | 2019 |  |  |  |  |
Maximum | IIA |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |
Royalty fees payable on product sales, percentage |  |  |  |  | 4.50% |  |
Maximum percentage of royalty payable on grant received |  |  |  |  | 100.00% |  |
Royalty amount payable excluding interest |  |  | $ 2,105 |  | $ 2,105 |  |

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