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Accrued Expenses
3 Months Ended
Mar. 31, 2025
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consist of the following (in thousands):
 March 31,December 31,
 20252024
Payroll and employee related expenses$1,424 $3,534 
Accrued patent fees221 813 
Accrued external research and development costs4,917 2,987 
Accrued professional and consulting services1,668 3,674 
Property and equipment531 782 
Other436 286 
Accrued expenses$9,197 $12,076