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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Prepaid Expense and Other Assets, Current [Abstract] |  |
Research and development tax credit receivable | $ 1,326 | $ 1,148
Prepayments | 703 | 899
Other current assets | 103 | 236
Prepaid expenses and other current assets | $ 2,132 | $ 2,283

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