Note 13 - License and Collaboration Agreements	6 Months Ended
Jun. 30, 2023
Notes to Financial Statements
Collaborative Arrangement Disclosure [Text Block]	Note 13 – License and Collaboration Agreements *Agenus Agreement* In November 2019, the Company entered into a license agreement with Agenus Inc., pursuant to which Agenus granted to the Company an exclusive, worldwide (not including Argentina, Brazil, Chile, Colombia, Peru, Venezuela and their respective territories and possessions), royalty-bearing, sublicensable license under Agenus’s intellectual property rights to develop, make, use, sell, import, and otherwise commercialize products incorporating a proprietary monoclonal antibody of Agenus known as AGEN1884 (zalifrelimab), an anti-CTLA-4 antagonist, for the treatment of cancers of the urinary tract via intravesical delivery. UGN-301 is a formulation of zalifrelimab administered using RTGel technology that is in Phase 1 clinical development for high-grade non-muscle invasive bladder cancer ("high-grade NMIBC"). *MD Anderson Agreement* In January 2021, the Company announced that it entered into a three-year strategic research collaboration agreement with MD Anderson focusing on the sequential use of UGN-201 and UGN-301 as an investigational treatment for high-grade NMIBC. Pursuant to the agreement, the Company has made bi-annual payments totaling $2.0 million to MD Anderson to fund the collaboration, recognized evenly over the associated period through research and development expenses. In July 2022, the Company determined that it had achieved the objectives that it established when the agreement was initiated, and notified MD Anderson that it was exercising its right to conclude the collaboration in 2022 as the Company did not foresee initiating further development activities as part of the collaboration, although the Company will continue to collaborate on existing joint projects. As a result of this notification, the Company is not responsible for any further fixed bi-annual funding payments in 2023, although the Company will be responsible for costs related to existing joint projects to the extent they exceed the payments already made to MD Anderson.

Note 13 - License and Collaboration Agreements

6 Months Ended

Jun. 30, 2023

Collaborative Arrangement Disclosure [Text Block]

Note 13 – License and Collaboration Agreements

Agenus Agreement

In November 2019, the Company entered into a license agreement with Agenus Inc., pursuant to which Agenus granted to the Company an exclusive, worldwide (not including Argentina, Brazil, Chile, Colombia, Peru, Venezuela and their respective territories and possessions), royalty-bearing, sublicensable license under Agenus’s intellectual property rights to develop, make, use, sell, import, and otherwise commercialize products incorporating a proprietary monoclonal antibody of Agenus known as AGEN1884 (zalifrelimab), an anti-CTLA-4 antagonist, for the treatment of cancers of the urinary tract via intravesical delivery. UGN-301 is a formulation of zalifrelimab administered using RTGel technology that is in Phase 1 clinical development for high-grade non-muscle invasive bladder cancer ("high-grade NMIBC").

MD Anderson Agreement

In January 2021, the Company announced that it entered into a three-year strategic research collaboration agreement with MD Anderson focusing on the sequential use of UGN-201 and UGN-301 as an investigational treatment for high-grade NMIBC. Pursuant to the agreement, the Company has made bi-annual payments totaling $2.0 million to MD Anderson to fund the collaboration, recognized evenly over the associated period through research and development expenses. In July 2022, the Company determined that it had achieved the objectives that it established when the agreement was initiated, and notified MD Anderson that it was exercising its right to conclude the collaboration in 2022 as the Company did not foresee initiating further development activities as part of the collaboration, although the Company will continue to collaborate on existing joint projects. As a result of this notification, the Company is not responsible for any further fixed bi-annual funding payments in 2023, although the Company will be responsible for costs related to existing joint projects to the extent they exceed the payments already made to MD Anderson.