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Accrued Expenses
6 Months Ended
Jun. 30, 2021
Payables and Accruals [Abstract]  
Accrued Expenses Accrued Expenses
Accrued expenses consist of the following (in thousands):
June 30,December 31,
20212020
Accrued research and development expenses$16,640 $11,947 
Accrued employee expenses6,389 5,649 
Accrued legal expenses785 — 
Accrued general and administrative expenses126 996 
Lease liability804 902 
Taxes payable560 410 
Other$— $36 
Total accrued expenses$25,304 $19,940