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Accrued Expenses and Other Liabilities (Details)
£ in Thousands, $ in Thousands
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2018
GBP (£)
Payables and Accruals [Abstract]      
Compensation and benefits $ 8,695 $ 8,732  
Research and development costs 11,468 15,343  
UCLB milestone and option 206 205 £ 350
Professional fees 3,311 3,005  
U.S. corporate income and local taxes 429 0  
Other liabilities 574 496  
Total accrued expenses and other liabilities $ 24,683 $ 27,781