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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2022 | Dec. 31, 2021
Research and development tax credit receivable | $ 4,732 | $ 3,727
Prepayments and VAT receivable | 667 | 577
Other current assets | 1,539 | 79
Prepaid expenses and other current assets | 6,938 | $ 4,383
Xcyte Therapies, Inc. [Member] |  |
Other current assets | 1,300 |
Other income | $ 1,300 |

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