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Accrued Expenses and Other Current Liabilities
 3 Months Ended
Mar. 31, 2022
Payables and Accruals [Abstract]  
Accrued Expenses and Other Current Liabilities Accrued Expenses and Other Current Liabilities
Accrued expenses consisted of the following (in thousands):
March 31, 2022December 31, 2021
Accrued employee compensation and benefits$1,365 $5,596 
Accrued external research and development expenses4,697 3,079 
Accrued professional fees718 495 
Other230 392 
$7,010 $9,562