Commitments and Contingencies	3 Months Ended
Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	14. COMMITMENTS AND CONTINGENCIES Guarantees and Indemnifications As permitted under Delaware law, the Company indemnifies its officers and directors for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The term of the indemnification is for the officer’s or director’s lifetime. Through March 31, 2025, the Company had not experienced any losses related to these indemnification obligations and no material claims were outstanding. The Company does not expect significant claims related to these indemnification obligations, and consequently, concluded that the fair value of these obligations is negligible, and no related reserves were established. In-License Agreements MEEI Agreement The Company was developing ADX‑2191 for the treatment of proliferative vitreoretinopathy pursuant to an Exclusive License Agreement with Massachusetts Eye and Ear Infirmary (MEEI), originally entered into in July 2016 between MEEI and Helio Vision, Inc., as amended, (the MEEI Agreement). The Company assumed the MEEI Agreement in connection with the 2019 acquisition of Helio Vision. Pursuant to the MEEI Agreement, the Company obtained an exclusive worldwide license from MEEI to develop and commercialize ADX‑2191 under certain patents and patent applications, in addition to other licenses to intellectual property (the MEEI Patent Rights). The Company has agreed to use commercially reasonable efforts to develop ADX‑2191, and to meet certain specified effort and achievement benchmarks by certain dates. In consideration for the rights licensed under the MEEI Agreement, Helio Vision issued MEEI a number of shares of preferred stock and Helio Vision agreed, during the term of the agreement, to pay non-creditable nonrefundable license maintenance fees to MEEI of $15,000 on each of the second and third anniversary of the agreement, $25,000 on each of the fourth and fifth anniversary of the agreement, and $35,000 on the sixth and each subsequent anniversary of the agreement. In addition, Helio Vision was obligated to make future sales-dependent milestone payments to MEEI of up to low seven figures in the aggregate, as well as royalty payments to MEEI at a rate which, as a percentage of net sales, is in the low single digits for products that incorporate or use the MEEI Patent Rights. Helio is also obligated under the MEEI Agreement to pay MEEI a percentage of certain sublicense revenue at a percentage rate that descends from low-double digits to mid-single digits based on the date of the sublicense. Following the Company’s acquisition of Helio Vision, the Company became obligated to make any future payments previously owed by Helio under the MEEI Agreement. There is no additional equity consideration issuable under the MEEI Agreement. The MEEI Agreement will remain in effect until the expiration date of the last to expire patent licensed under the MEEI Agreement. The Company may terminate the MEEI Agreement with timely written notice to MEEI. MEEI has the right to terminate the MEEI Agreement, subject to certain specified cure periods, in the event of the Company’s insolvency or bankruptcy or if the Company ceases all business operations with respect to licensed products; the Company fails to pay amounts due under the MEEI Agreement; the Company fails to comply with certain due diligence obligations; the Company does not maintain specific levels of insurance; one of the Company's officers is convicted of a felony relating to the manufacture, use, sale or importation of licensed products; or the Company materially breaches any provisions of the MEEI Agreement or in the event of insolvency or bankruptcy. In the event of an early termination of the MEEI Agreement, all rights licensed and developed by the Company under the MEEI Agreement will revert to MEEI. The Company has agreed to indemnify MEEI for certain claims that may arise under the MEEI Agreement. Legal Proceedings On July 31, 2023, a purported stockholder filed a putative class action lawsuit (the Securities Class Action) in the U.S. District Court for the District of Massachusetts, against the Company and certain current and former officers, captioned Juliana Paice v. Aldeyra Therapeutics, Inc., et al. (No. 23-cv-11737). On January 2, 2024, the lead plaintiff filed an amended complaint. The lawsuit alleged violations by the defendants of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 10b-5. The plaintiff alleged that the defendants made false or misleading statements or failed to disclose certain information concerning (i) the NDA for and the prospects of ADX‑2191 for the treatment of primary vitreoretinal lymphoma and (ii) the NDA for and the prospects of reproxalap for the treatment of dry eye disease. The lawsuit sought, among other things, compensatory damages on behalf of herself and all persons and entities that purchased or otherwise acquired our securities between January 7, 2021, and October 16, 2023, as well as attorneys’ fees and costs. On March 14, 2025, the court granted defendants’ motion to dismiss the entire case with prejudice. In addition, from time to time, the Company is subject to litigation and claims arising in the ordinary course of business but, except as stated above, the Company is not currently a party to any material legal proceedings and the Company is not aware of any pending or threatened legal proceedings against them that the Company believes could have a material adverse effect on the Company's business, operating results, cash flows, or financial condition.

Commitments and Contingencies

3 Months Ended

Mar. 31, 2025

Commitments and Contingencies Disclosure [Abstract]

14.

COMMITMENTS AND CONTINGENCIES

Guarantees and Indemnifications

As permitted under Delaware law, the Company indemnifies its officers and directors for certain events or occurrences while the officer or director is, or was, serving at the Company’s request in such capacity. The term of the indemnification is for the officer’s or director’s lifetime. Through March 31, 2025, the Company had not experienced any losses related to these indemnification obligations and no material claims were outstanding. The Company does not expect significant claims related to these indemnification obligations, and consequently, concluded that the fair value of these obligations is negligible, and no related reserves were established.

In-License Agreements

MEEI Agreement

The Company was developing ADX‑2191 for the treatment of proliferative vitreoretinopathy pursuant to an Exclusive License Agreement with Massachusetts Eye and Ear Infirmary (MEEI), originally entered into in July 2016 between MEEI and Helio Vision, Inc., as amended, (the MEEI Agreement). The Company assumed the MEEI Agreement in connection with the 2019 acquisition of Helio Vision.

Pursuant to the MEEI Agreement, the Company obtained an exclusive worldwide license from MEEI to develop and commercialize ADX‑2191 under certain patents and patent applications, in addition to other licenses to intellectual property (the MEEI Patent Rights). The Company has agreed to use commercially reasonable efforts to develop ADX‑2191, and to meet certain specified effort and achievement benchmarks by certain dates.

In consideration for the rights licensed under the MEEI Agreement, Helio Vision issued MEEI a number of shares of preferred stock and Helio Vision agreed, during the term of the agreement, to pay non-creditable nonrefundable license maintenance fees to MEEI of $15,000 on each of the second and third anniversary of the agreement, $25,000 on each of the fourth and fifth anniversary of the agreement, and $35,000 on the sixth and each subsequent anniversary of the agreement. In addition, Helio Vision was obligated to make future sales-dependent milestone payments to MEEI of up to low seven figures in the aggregate, as well as royalty payments to MEEI at a rate which, as a percentage of net sales, is in the low single digits for products that incorporate or use the MEEI Patent Rights. Helio is also obligated under the MEEI Agreement to pay MEEI a percentage of certain sublicense revenue at a percentage rate that descends from low-double digits to mid-single digits based on the date of the sublicense. Following the Company’s acquisition of Helio Vision, the Company became obligated to make any future payments previously owed by Helio under the MEEI Agreement. There is no additional equity consideration issuable under the MEEI Agreement.

The MEEI Agreement will remain in effect until the expiration date of the last to expire patent licensed under the MEEI Agreement. The Company may terminate the MEEI Agreement with timely written notice to MEEI. MEEI has the right to terminate the MEEI Agreement, subject to certain specified cure periods, in the event of the Company’s insolvency or bankruptcy or if the Company ceases all business operations with respect to licensed products; the Company fails to pay amounts due under the MEEI Agreement; the Company fails to comply with certain due diligence obligations; the Company does not maintain specific levels of insurance; one of the Company's officers is convicted of a felony relating to the manufacture, use, sale or importation of licensed products; or the Company materially breaches any provisions of the MEEI Agreement or in the event of insolvency or bankruptcy.

In the event of an early termination of the MEEI Agreement, all rights licensed and developed by the Company under the MEEI Agreement will revert to MEEI. The Company has agreed to indemnify MEEI for certain claims that may arise under the MEEI Agreement.

Legal Proceedings

On July 31, 2023, a purported stockholder filed a putative class action lawsuit (the Securities Class Action) in the U.S. District Court for the District of Massachusetts, against the Company and certain current and former officers, captioned Juliana Paice v. Aldeyra Therapeutics, Inc., et al. (No. 23-cv-11737). On January 2, 2024, the lead plaintiff filed an amended complaint. The lawsuit alleged violations by the defendants of Sections 10(b) and 20(a) of the Securities Exchange Act of 1934 and SEC Rule 10b-5. The plaintiff alleged that the defendants made false or misleading statements or failed to disclose certain information concerning (i) the NDA for and the prospects of ADX‑2191 for the treatment of primary vitreoretinal lymphoma and (ii) the NDA for and the prospects of reproxalap for the treatment of dry eye disease. The lawsuit sought, among other things, compensatory damages on behalf of herself and all persons and entities that purchased or otherwise acquired our securities between January 7, 2021, and October 16, 2023, as well as attorneys’ fees and costs. On March 14, 2025, the court granted defendants’ motion to dismiss the entire case with prejudice.

In addition, from time to time, the Company is subject to litigation and claims arising in the ordinary course of business but, except as stated above, the Company is not currently a party to any material legal proceedings and the Company is not aware of any pending or threatened legal proceedings against them that the Company believes could have a material adverse effect on the Company's business, operating results, cash flows, or financial condition.