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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 2,010 $ 1,313
Prepayments and VAT receivable 448 684
Other current assets 228 66
Prepaid expenses and other current assets $ 2,686 $ 2,063