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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Payables And Accruals [Abstract]    
Payroll and employee-related expenses $ 371 $ 1,945
Third-party research and development expenses 3,195 984
Professional fees 677 250
Loan interest 227 242
Other 10  
Total accrued expenses $ 4,480 $ 3,421