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Prepaid Expenses and Other Current Assets (Schedule of Prepaid Expenses and Other Current Assets) (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 4,664 $ 3,727
Prepayments and VAT receivable 976 577
Other current assets 426 79
Prepaid expenses and other current assets 6,066 4,383
Non-current assets $ 2,916 $ 1,551