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Prepaid Expenses and Other Current Assets (Tables)
 3 Months Ended
Mar. 31, 2022
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,
20222021
UK R&D tax credit$12,178 $9,587 
Prepaid insurance premium2,117 3,359 
Prepaid research and development4,618 4,562 
VAT recoverable1,424 1,629 
Deferred offering costs817 840 
Security deposit276 274 
Other current assets1,334 1,370 
$22,764 $21,621