3. Collaboration and Research Arrangements

Collaboration with Global Blood Therapeutics

On December 17, 2019, the Company entered into a license and collaboration agreement (the “GBT Collaboration Agreement”) with Global Blood Therapeutics, Inc. (“GBT”), now a subsidiary of Pfizer, pursuant to which the parties agreed to a research collaboration to discover novel targets that induce fetal hemoglobin in order to develop new small molecule treatments for sickle cell disease and beta thalassemia. The research term (the “Research Term”) was for an initial period of three years and could be extended for up to two additional one-year terms upon mutual agreement. In November 2022, the Company and GBT agreed to extend the Research Term for an additional one-year period. In July 2023, Pfizer, as successor to GBT, elected to exercise its right to terminate the GBT Collaboration Agreement, effective October 16, 2023.

Pursuant to the terms of the GBT Collaboration Agreement, GBT paid the Company an upfront payment of $20.0 million. GBT also agreed to reimburse the Company for full-time employee and out-of-pocket costs and expenses

incurred by the Company in accordance with the agreed-upon research budget, which was anticipated to total approximately $40.0 million over the initial Research Term.

The Company granted to GBT an option (the “Option”) to obtain an exclusive, worldwide license, with the right to sublicense, under relevant intellectual property rights and know-how of the Company arising from the collaboration to develop, manufacture and commercialize any compounds or products resulting from the collaboration. This Option terminated simultaneously with the effective date of termination of the GBT Collaboration Agreement, and the Company is no longer eligible to receive any milestone or royalty-based payments from GBT.

GBT Collaboration Revenue

The Company analyzed the GBT Collaboration Agreement and concluded that it represented a contract with a customer within the scope of ASC 606.

The Company identified a single performance obligation, which included a (i) non-exclusive research license that GBT had access to during the initial Research Term and (ii) research and development services provided during the initial Research Term. The non-exclusive research license only allowed GBT to evaluate the candidate compounds developed under the research plan or to conduct work allocated to it during the Research Term. GBT could not extract any benefit from the non-exclusive research license without the research and development services performed by the Company, including the provision of data package information. As such, these two promises are inputs to a combined output (the delivery of data package allowing GBT to make an Option exercise decision) and are bundled into a single performance obligation (the non-exclusive research license and research and development service performance obligation).

ASC 606 requires an entity to recognize revenue only when it satisfies a performance obligation by transferring a promised good or service to a customer. A good or service is considered to be transferred when the customer obtains control. As the non-exclusive research license and research and development services represent one performance obligation, the Company has determined that it would satisfy its performance obligation over a period of time as services are performed and GBT receives the benefit of the services, as the overall purpose of the arrangement is for the Company to perform the services. The Company recognizes revenue associated with the performance obligation as the research and development services are provided using an input method, according to the costs incurred as related to the research and development activities and the costs expected to be incurred in the future to satisfy the performance obligation. The transfer of control occurs during this time and is the best measure of progress towards satisfying the performance obligation.