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Prepaid Expenses and Other Assets (Schedule of Prepaid Expenses and Other Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Prepaid Expenses and Other Assets |  |
Research and development tax credit receivable |  | $ 2,933
Prepayments and VAT receivable | $ 237 | 792
Other current assets | 300 | 341
Prepaid expenses and other assets | $ 537 | $ 4,066

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