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Accrued Expenses and Other Liabilities
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Accrued Expenses and Other Liabilities Accrued Expenses and Other Liabilities
Accrued expenses and other liabilities consisted of the following (in thousands):
March 31, 2021December 31, 2020
Compensation and benefits
$8,695 $8,732 
Research and development costs
11,468 15,343 
UCLB milestone and option
206 205 
Professional fees
3,311 3,005 
U.S. corporate income and local taxes
429 — 
Other liabilities
574 496 
Total accrued expenses and other liabilities
$24,683 $27,781