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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued Liabilities Current [Abstract]    
Research and development expenses $ 15,169 $ 5,821
Payroll and payroll-related 6,033 2,918
Professional fees 1,417 1,585
Other 352 6
Accrued expenses $ 22,971 $ 10,330