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Accrued Expenses
 9 Months Ended
Sep. 30, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses and other current liabilities consisted of the following (in thousands):
 September 30,December 31,
 20212020
Accrued accounts payable$2,732 $1,220 
Collaboration cost-sharing obligation 2,543 — 
Research and development fees8,422 2,001 
Compensation expense2,914 2,759 
Accrued license obligations1,655 358 
Lease liabilities1,032 1,030 
Audit and tax fees165 128 
Other current liabilities222 235 
Total $19,685 $7,731