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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Payables and Accruals [Abstract]    
Payroll and employee related expenses $ 1,868 $ 4,216
Professional fees 3,895 377
Third-party research and development expenses 29 773
Legal settlements 1,675 0
Other 380 525
Total $ 7,847 $ 5,891