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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2022
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):
December 31,
20222021
UK R&D tax credit$13,972 $9,587 
Prepaid insurance premium2,818 3,359 
Prepaid research and development28,211 4,562 
VAT recoverable1,652 1,629 
Deferred offering costs— 840 
Security deposit97 274 
Other current assets945 1,370 
$47,695 $21,621