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Accrued Expenses and Other Liabilities (Details)
$ in Thousands, £ in Millions
Sep. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2018
GBP (£)
Payables and Accruals [Abstract]      
Compensation and benefits $ 5,937 $ 6,568  
Research and development costs 13,073 10,449  
UCLB milestone and option 840 663 £ 0.5
Professional fees 5,148 2,611  
U.S. corporate income and local taxes 0 391  
Other liabilities 402 716  
Total accrued expenses and other liabilities $ 25,400 $ 21,398