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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accounts Payable and Accrued Expenses [Abstract]    
Research and development $ 13,948 $ 12,082
Property and equipment 1,635 725
Employee compensation 1,484 4,533
Government grant payable 597 597
Professional fees 1,402 1,196
Other 965 482
Accounts payable and accrued expenses $ 20,031 $ 19,615