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Accrued Expenses and Other Liabilities
9 Months Ended
Sep. 30, 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):
September 30, 2021December 31, 2020
Compensation and benefits
$8,798 $8,732 
Research and development costs
16,457 15,343 
UCLB milestone and option
— 205 
Professional fees
3,060 3,005 
U.S. corporate income and local taxes
— 
Other liabilities
312 496 
Total accrued expenses and other liabilities
$28,634 $27,781