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Merger with Sesen Bio (Details) - USD ($) $ in Thousands | Mar. 07, 2023 | Mar. 31, 2023 | Dec. 31, 2022
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Merger with Sesen Bio |  |  |
Entity common stock, shares outstanding immediately after merger |  | 40,254,666 | 2,217,737
Cash and cash equivalents | $ 37,873 |  |
Marketable securities | 44,588 |  |
Prepaid expenses and other assets | 1,316 |  |
Restricted cash | 30 |  |
Accounts payable and accrued expenses | (3,499) |  |
Total net assets acquired | 80,308 |  |
Less: Transaction costs | (8,264) |  |
Total net assets acquired less transaction costs | 72,044 |  |
Carisma Therapeutics Inc. |  |  |
Merger with Sesen Bio |  |  |
Severance and personnel costs paid | $ 4,600 |  |
CARISMA Therapeutics Inc, Legacy, Stockholders | Carisma Therapeutics Inc. |  |  |
Merger with Sesen Bio |  |  |
Business acquisition percentage of voting interests acquired | 74.20% |  |
Entity common stock, shares outstanding immediately after merger | 40,254,666 |  |

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