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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 2,514 | $ 1,313
Prepayments and VAT receivable | 530 | 684
Other current assets | 112 | 66
Prepaid expenses and other current assets | $ 3,156 | $ 2,063

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- Definition Represents the amount of current prepayments and value added tax receivable. + References No definition available. + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other tax receivables expected to be realized or consumed within one year or operating cycle, if longer. + References No definition available. + Details
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