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Accounts Payable, Accrued Expenses and Other - Schedule of Accounts Payable, Accrued Expenses and Other (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Payables And Accruals [Abstract]    
Accounts payable $ 177 $ 120
Accrued goods and services 112 167
Accrued clinical trial costs 84 84
Others 191 191
Total accounts payable, accrued expenses and other $ 564 $ 562