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Prepaid Expenses and Other Current Assets
 12 Months Ended
Dec. 31, 2021
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,
20212020
UK R&D tax credit$9,587 $4,610 
Prepaid insurance premium3,359 3,154 
Prepaid research and development4,562 2,317 
VAT recoverable1,629 1,171 
Deferred offering costs840 — 
Security deposit274 287 
Other current assets1,370 509 
$21,621 $12,048