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Shanghai Adicet Biotechnology Co., Ltd. (the Adicet VIE) (Additional Information) (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2026 | Mar. 31, 2025
Variable Interest Entity [Line Items] |  |
Expenses | $ 21,570 | $ 29,885
Research and development Expense | 17,487 | 22,814
General and administrative Expense | $ 4,083 | $ 7,071

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