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Prepaid Expenses and Other Current Assets (Tables)
3 Months Ended
Mar. 31, 2023
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):
March 31,December 31,
20232022
UK R&D tax credit$18,672 $13,972 
Prepaid insurance premium1,755 2,818 
Prepaid research and development26,775 28,211 
VAT recoverable1,689 1,652 
Other current assets1,490 1,042 
$50,381 $47,695