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Prepaid Expenses and Other Current Assets
 9 Months Ended
Sep. 30, 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):
September 30,December 31,
20212020
UK R&D tax credit$6,664 $4,610 
Prepaid insurance premium4,469 3,154 
Prepaid research and development4,920 2,317 
VAT recoverable1,394 1,171 
Deferred offering costs228 — 
Other current assets1,058 796 
$18,733 $12,048