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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 1,313 | $ 1,326
Prepayments and VAT receivable | 684 | 703
Other current assets | 66 | 103
Prepaid expenses and other current assets | $ 2,063 | $ 2,132

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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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