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Goodwill and Intangible Assets
 3 Months Ended
Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
On November 13, 2023, the Company merged with Old Cartesian in accordance with the terms of the Merger Agreement, by and among Selecta, Sakura Merger Sub I, Inc., a wholly owned subsidiary of Selecta, or First Merger Sub, Sakura Merger Sub II, LLC, a wholly owned subsidiary of Selecta, or Second Merger Sub, and Old Cartesian. Pursuant to the Merger Agreement, First Merger Sub merged with and into Old Cartesian, pursuant to which Old Cartesian was the surviving corporation and became a wholly owned subsidiary of Selecta, or the First Merger. Immediately following the First Merger, Old Cartesian merged with and into Second Merger Sub, pursuant to which Second Merger Sub was the surviving entity, or the Second Merger and, together with the First Merger, the Merger. In connection with the Second Merger, Old Cartesian changed its name to Cartesian Bio, LLC. As a result of the Merger, Selecta changed its corporate name to Cartesian Therapeutics, Inc. See Note 4 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024 for further discussion of the Merger.
Goodwill
The Merger resulted in goodwill of approximately $48.2 million. There were no changes to the carrying value of the Company’s goodwill during the three months ended March 31, 2025.
Intangible Assets
The following summarizes the Company’s indefinite-lived intangible assets, all of which were acquired in the Merger (in thousands):

March 31,December 31,
20252024
Descartes-08 for MG$93,900 $93,900 
Descartes-08 for SLE56,700 56,700 
Total in-process research and development assets$150,600 $150,600