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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 3,727 | $ 1,313
Prepayments and VAT receivable | 577 | 684
Other current assets | 79 | 66
Prepaid expenses and other current assets | 4,383 | 2,063
Non-current assets | $ 1,551 | $ 0

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