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Prepaid Expenses and Other Current Assets - Summary of Schedule of Prepaid and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid expenses $ 152 $ 64
Australian research and development tax credit 99  
Other current assets 16 26
Total prepaid expenses and other current assets $ 267 $ 90