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Accounts Payable and Accrued Expenses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Accounts Payable and Accrued Expenses    
Accounts payable $ 718 $ 427
Clinical trials 2,161 2,995
Professional fees 1,028 510
Accrued compensation 11 389
Commercial insurance premium financing 757 269
Other 82 221
Accounts payable and accrued expenses $ 4,757 $ 4,811