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Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |
UK R&D tax credit | $ 16,774 | $ 9,587
Prepaid insurance premium | 3,068 | 3,359
Prepaid research and development | 22,203 | 4,562
VAT recoverable | 1,348 | 1,629
Deferred offering costs | 0 | 840
Security deposit | 89 | 274
Other current assets | 1,273 | 1,370
Prepaid expenses and other current assets | $ 44,755 | $ 21,621

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