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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 4,664 | $ 3,727
Prepayments and VAT receivable | 976 | 577
Other current assets | 426 | 79
Prepaid expenses and other current assets | 6,066 | $ 4,383
Deposits Assets, Noncurrent Clinical Trials | $ 3,500 |

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