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Accrued Expenses
9 Months Ended
Sep. 30, 2023
Accrued Liabilities, Current [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following (in thousands):
September 30,
2023
December 31,
2022
External research and development expenses$17,135 $16,452 
Employee related expenses9,536 10,140 
Intellectual property and patent related fees1,385 1,809 
Professional service expenses943 1,260 
Other expenses1,279 1,635 
Total accrued expenses$30,278 $31,296