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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 2,933 $ 4,664
Prepayments and VAT receivable 792 976
Other current assets 341 426
Prepaid expenses and other current assets $ 4,066 $ 6,066