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Accrued Expenses
 3 Months Ended
Mar. 31, 2024
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following (in thousands):
March 31, 2024December 31, 2023
Research and development$3,165 $3,131 
Professional fees669 1,366 
Compensation and related expenses881 3,100 
Other14 65 
$4,729 $7,662