License and Development Agreements	3 Months Ended
Mar. 31, 2026
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 our collaboration partner 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 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 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 intellectual property 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. No such royalty revenue has been recorded to date. 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 $1.5 million and $1.5 million for the three months ended March 31, 2026 and 2025, 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 $0.8 million and $0.8 million for the three months ended March 31, 2026 and 2025, respectively. The contract liability was $5.2 million and $7.7 million as of March 31, 2026 and 2025, respectively. Revenue recognized for the three months ended March 31, 2026, that was included in the contract liabilities balances as of January 1, 2026 was approximately $1.5 million. Revenue recognized for the three months ended March 31, 2025, that was included in the contract liabilities balances as of January 1, 2025, was approximately $1.5 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. Accounting Analysis and Revenue Recognition At contract inception, the Company evaluated the goods and services promised in the Kwangdong Agreement, including the license, access to certain technology and know‑how, support services, and future product manufacturing. The Company concluded that these promises are not distinct in the context of the contract, as Kwangdong cannot derive benefit from the license without the Company’s manufacturing and related support. Accordingly, the Company identified a single combined performance obligation, consisting of the manufacture and supply of OCU400, inclusive of the related license and support activities. At contract inception, the transaction price consisted of the $0.8 million upfront payment. All other forms of consideration, including regulatory and development milestones, sales milestone payments, and royalties, represent variable consideration. Because these payments are dependent on future regulatory approvals or sales in the territory — events that are outside the Company’s control and subject to significant uncertainty — the Company has fully constrained such amounts in accordance with ASC 606. The Company will include these amounts in the transaction price only when it becomes probable that a significant reversal of cumulative revenue will not occur. The Company will recognize revenue related to the Kwangdong Agreement at a point in time, when control of the manufactured product is transferred to Kwangdong. The specific point at which control transfers will be determined based on terms in the future supply agreement (e.g., title passage, shipping terms, acceptance provisions). No revenue was recognized under the Kwangdong Agreement during the quarter ended March 31, 2026, as the Company did not deliver any manufactured product and therefore did not satisfy any portion of the combined performance obligation. On the consolidated balance sheet, the Company classified the $0.8 million upfront payment as deferred revenue under other non-current liabilities as of March 31, 2026 and December 31, 2025. This amount will be recognized as revenue once the Company fulfills its overall performance obligation by delivering the manufactured products to Kwangdong.

The Company entered into a co-development and commercialization agreement with our collaboration partner 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 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 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.

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. No such royalty revenue has been recorded to date. 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 $1.5 million and $1.5 million for the three months ended March 31, 2026 and 2025, 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 $0.8 million and $0.8 million for the three months ended March 31, 2026 and 2025, respectively.

The contract liability was $5.2 million and $7.7 million as of March 31, 2026 and 2025, respectively. Revenue recognized for the three months ended March 31, 2026, that was included in the contract liabilities balances as of January 1, 2026 was approximately $1.5 million. Revenue recognized for the three months ended March 31, 2025, that was included in the contract liabilities balances as of January 1, 2025, was approximately $1.5 million.

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.

At contract inception, the Company evaluated the goods and services promised in the Kwangdong Agreement, including the license, access to certain technology and know‑how, support services, and future product manufacturing. The Company concluded that these promises are not distinct in the context of the contract, as Kwangdong cannot derive benefit from the license without the Company’s manufacturing and related support.

Because these payments are dependent on future regulatory approvals or sales in the territory — events that are outside the Company’s control and subject to significant uncertainty — the Company has fully constrained such amounts in accordance with ASC 606. The Company will include these amounts in the transaction price only when it becomes probable that a significant reversal of cumulative revenue will not occur.

The Company will recognize revenue related to the Kwangdong Agreement at a point in time, when control of the manufactured product is transferred to Kwangdong. The specific point at which control transfers will be determined based on terms in the future supply agreement (e.g., title passage, shipping terms, acceptance provisions).

On the consolidated balance sheet, the Company classified the $0.8 million upfront payment as deferred revenue under other non-current liabilities as of March 31, 2026 and December 31, 2025. This amount will be recognized as revenue once the Company fulfills its overall performance obligation by delivering the manufactured products to Kwangdong.