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Merger - Schedule of Allocation of the Purchase Price to the Estimated Fair Values of the Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023 | Nov. 13, 2023
--- | --- | --- | ---
Assets acquired: |  |  |
Goodwill | $ 48,163 | $ 48,163 |
Old Cartesian |  |  |
Assets acquired: |  |  |
Cash and cash equivalents |  |  | $ 6,561
Prepaid expenses and other current assets |  |  | 309
Property and equipment, net |  |  | 215
Right-of-use asset, net |  |  | 915
In-process research and development assets |  |  | 150,600
Goodwill |  |  | 48,163
Total assets acquired |  |  | 206,763
Liabilities assumed |  |  |
Accrued expenses and other current liabilities |  |  | 2,530
Lease liability |  |  | 292
Lease liability, net of current portion |  |  | 623
Deferred tax liability |  |  | 34,853
Total liabilities assumed |  |  | 38,298
Net assets acquired |  |  | $ 168,465

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