License and Development Agreements	9 Months Ended
License and Development Agreements	Sep. 30, 2025
Revenue from Contract with Customer [Abstract]
License and Development Agreements	License and Development Agreements Co-Development and Commercialization Agreement with CanSino Biologics, Inc. The Company entered into a co-development and commercialization agreement with CanSino Biologics, Inc. ("CanSinoBIO") with respect to the development and commercialization of the Company's modifier gene therapy product candidates, OCU400, OCU410, and OCU410ST. The co-development and commercialization agreement was originally entered into in September 2019 ("the Original CanSinoBIO Agreement") with regards to OCU400 and was subsequently amended in September 2021 and November 2022 ("the Amendments"), to include OCU410 and OCU410ST, respectively. The Company concluded that the Original CanSinoBIO Agreement and the Amendments are separate agreements (collectively referred to as the "CanSinoBio Agreements"). Pursuant to the CanSinoBIO Agreements, the Company and CanSinoBIO are collaborating on the development of the Company's modifier gene therapy platform. CanSinoBIO is responsible for the chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products and is responsible for the costs associated with such activities. CanSinoBIO has an exclusive license to develop, manufacture, and commercialize the Company's modifier gene therapy platform in and for China, Hong Kong, Macau, and Taiwan (the "CanSinoBIO Territory"), and the Company maintains exclusive development, manufacturing, and commercialization rights with respect to the Company's modifier gene therapy platform outside the CanSinoBIO Territory (the "Company Territory"). Should any of the product candidates be commercialized in the CanSinoBIO Territory, CanSinoBIO will pay to the Company an annual royalty between mid- and high-single digits based on Net Sales (as defined in the CanSinoBIO Agreements) of the products included in the Company's modifier gene therapy platform in the CanSinoBIO Territory. The Company will pay to CanSinoBIO an annual royalty between low- and mid-single digits based on Net Sales of the products included in the Company's modifier gene therapy platform in the Company Territory. Accounting analysis and revenue recognition The Company determined the collaboration arrangements with CanSinoBIO, are within the scope of ASC 808 and has analogized to ASC 606 to account for CanSinoBIO's access to its IP as well as data generated in connection with the co-development activities to be undertaken by Ocugen. These elements of the arrangements are not distinct and are accounted for as a single performance obligation. The non-cash consideration to be received related to the Company's satisfaction of the performance obligation includes but is not limited to services related to chemistry, manufacturing, and controls development and manufacture of clinical supplies of such products through completion of pre-clinical, clinical, regulatory, and other commercialization readiness services. The estimated market value of the co-development services to be performed by CanSinoBIO, represents variable consideration that is included in the transaction price. The Company recognizes collaborative arrangement revenue over time using an input method using ratio of costs incurred to date compared to total estimated costs required to satisfy the performance obligation under the CanSinoBIO Agreements. The Company constrained the transaction price related to certain future co-development services, as it assessed that it is probable that the inclusion of such variable consideration could result in a significant reversal of cumulative revenue in future periods. Royalty revenue will be recorded as sales occur based on the agreed upon royalties. The variable consideration, which is based on continued successful development of our programs, is reevaluated at each reporting period and as changes in circumstances occur. The services provided by CanSinoBIO are recorded as research and development expense as incurred and the difference between the revenue and expense recognized is recorded on the Company's balance sheet as a contract liability within Accrued expenses and other current liabilities. The related revenue recognized was recorded in the condensed consolidated statements of operations and comprehensive loss as collaborative arrangement revenue and was approximately $4.6 million and $3.3 million for the nine months ended September 30, 2025 and 2024, respectively. The related expense incurred for services provided by CanSinoBIO was recorded in the condensed consolidated statements of operations and comprehensive loss as research and development expense and was approximately $1.9 million and $0.9 million for the nine months ended September 30, 2025 and 2024, respectively. The contract liability was $5.7 million and $8.1 million as of September 30, 2025 and 2024, respectively. Revenue recognized for the nine months ended September 30, 2025, that was included in the contract liabilities balances as of January 1, 2025 was approximately $4.6 million. Revenue recognized for the nine months ended September 30, 2024, that was included in the contract liabilities balances as of January 1, 2024, was approximately $3.3 million. License Agreement with Kwangdong Pharmaceutical, Ltd. The Company entered into a license agreement (“Kwangdong License”) with Kwangdong Pharmaceutical, Ltd ("Kwangdong") for the development and commercialization of the Company's modifier gene therapy product candidate OCU400 in September 2025. Pursuant to the Kwangdong License, Kwangdong gains the exclusive rights to commercialize and develop OCU400 in South Korea (“Kwangdong Territory”). Kwangdong is responsible for commercialization and regulatory approval in the Kwangdong Territory. The Company retains exclusive right to manufacture for Kwangdong. The Company will also provide additional support services to Kwangdong throughout the term of the agreement to support commercialization. In accordance with the Kwangdong License, the Company received an initial $0.8 million (net of tax) non-refundable fee and is entitled to additional milestone based fees upon FDA and regulatory approval in the Kwangdong Territory as well as manufacturing based fees upon shipment. The Kwangdong License also includes an option (“Repurchase Option”) for the Company to purchase the license back from Kwangdong for three times the amount of fees paid to date plus expenses. That option expires upon regulatory approval in Kwangdong Territory. The Company determined the Kwangdong License is within the scope of ASC 606 as it does not meet the criteria to be accounted for as a collaboration agreement, and Kwangdong is considered to be a customer who is purchasing product from the Company. The Company determined that the license to commercialize and the manufacturing performance obligations are inseparable as Kwangdong cannot benefit from the license without the manufacturing. Revenue will be recognized upon delivery of product to Kwangdong. As of September 30, 2025, all $0.8 million of the non-refundable fee received is deferred as the Company has not delivered any product under the contract and has been recorded in Other non-current liabilities on the condensed consolidated balance sheets.