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Commitments and Contingencies, Type of Agreement (Details) - Maximum [Member] - USD ($) $ in Millions	Dec. 23, 2022	Jun. 15, 2022	Nov. 09, 2021	Apr. 10, 2019	Jun. 06, 2018
LCA5/RDH12 Agreement [Member] | Development, Regulatory and Commercial Milestone [Member]
Type of Arrangement [Abstract]
Milestone payments		$ 2.6
Iveric Agreement [Member] | Commercial Milestones [Member] | BEST1 Program [Member]
Type of Arrangement [Abstract]
Milestone payments	$ 111.7
BEST1 License Agreement [Member] | Commercial Milestones [Member] | First Licensed Product [Member]
Type of Arrangement [Abstract]
Milestone payments				$ 76.4
Penn and UF RHO License Agreement [Member] | Development, Regulatory and Commercial Milestone [Member]
Type of Arrangement [Abstract]
Milestone payments					$ 93.5
Massachusetts Eye and Ear Infirmary License Agreement [Member] | Development, Regulatory and Commercial Milestone [Member]
Type of Arrangement [Abstract]
Milestone payments			$ 0.4

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- Definition

The amount of consideration not recognized during the period for the future milestone or milestones.

+ References

No definition available.

+ Details

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- References

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