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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Accounts Payable and Accrued Expenses [Abstract]    
Research and development $ 17,536 $ 19,100
Employee compensation 4,199 10,006
Property and equipment 1,794 2,095
Professional fees 2,813 1,436
Acquisition related expenses 0 1,153
Government grant payable 597 597
Other 1,670 2,273
Accounts payable and accrued expenses $ 28,609 $ 36,660