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Accrued Expenses (Tables)
3 Months Ended
Mar. 31, 2021
Payables and Accruals [Abstract]  
Schedule of accrued expenses
Accrued expenses consists of the following:
March 31,December 31,
(in thousands)20212020
Accrued professional fees$889 $827 
Accrued compensation and benefits1,920 5,834 
Accrued research and development11,789 7,922 
Accrued other658 302 
Total accrued expenses$15,256 $14,885