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Accrued Expenses
9 Months Ended
Sep. 30, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consisted of the following (in thousands):
September 30, 2021December 31, 2020
Accrued external research and development expenses$10,348 $4,206 
Accrued personnel-related expenses3,909 5,516 
Accrued professional services1,324 133 
Accrued other948 1,014 
Total accrued expenses$16,529 $10,869