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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2024
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Prepaid Expenses and Other Current Assets
Prepaid expenses and other current assets consisted of the following (in thousands):
December 31,
20242023
UK R&D tax credit$20,712 $27,877 
Prepaid research and development
11,332 6,826 
Prepaid income tax
197 1,123 
VAT recoverable1,109 1,052 
Prepaid insurance premium
280 1,885 
Other current assets2,191 1,895 
$35,821 $40,658