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Accrued Expenses
 9 Months Ended
Sep. 30, 2021
Payables and Accruals [Abstract]  
Accrued Expenses ACCRUED EXPENSESAccrued expenses consisted of the following:
(in thousands)September 30,
2021		December 31,
2020
Accrued employee compensation and benefits$4,759 3,756 
Accrued external research and development expenses2,977 3,150 
Accrued professional fees899 627 
Other439 485 
$9,074 $8,018