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Accrued Expenses
 3 Months Ended
Mar. 31, 2024
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consists of the following:
March 31,December 31,
(in thousands)20242023
Accrued professional fees$13,927 $26,047 
Accrued compensation and benefits17,121 15,129 
Accrued research and development11,250 11,250 
Accrued other13,975 13,143 
Total accrued expenses$56,273 $65,569