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Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Accounts Payable and Accrued Expenses    
Accounts payable $ 218 $ 427
Clinical trials 1,930 2,995
Professional fees 663 510
Commercial insurance premium financing 473 269
Accrued severance 223  
Accrued compensation   389
Other 85 221
Accounts payable and accrued expenses $ 3,592 $ 4,811