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Prepaid Expenses and Other Current Assets
 9 Months Ended
Sep. 30, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
September 30,December 31,
20232022
Research and development claims receivable$37,111 $24,685 
Prepayments7,535 12,337 
VAT receivable2,327 2,701 
Other receivable2,357 1,469 
Deferred cost1,911 1,494 
Other assets127 203 
Accounts receivable165 121 
Total prepaid expenses and other current assets$51,533 $43,010