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Accrued and Other Current Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Accrued and other current liabilities:    
Other accrued expenses $ 173 $ 2,616
Accrued employee expenses 1,045 974
Accrued research and development expenses 739 923
Professional services 2,771 342
Total accrued and other current liabilities $ 4,728 $ 4,855