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Accounts Payable and Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable and Accrued Expenses [Abstract]    
Research and development $ 14,962 $ 7,418
Property and equipment 1,456 4,424
Employee compensation 4,875 2,588
Accrued interest 1,122 1,241
Government grant payable 590 562
Professional fees 1,332 553
Internal use software 300 226
Other 835 340
Total $ 25,472 $ 17,352