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Accrued Expenses and Other Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Payables and Accruals [Abstract]    
Compensation and benefits $ 8,258 $ 8,747
Research and development costs 23,231 11,311
UCLB milestone and option 0 10
Professional fees 2,299 3,449
U.S. corporate income and local taxes 26 0
Other liabilities 855 150
Total accrued expenses and other liabilities $ 34,669 $ 23,667