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Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid insurance $ 698 $ 1,344
Prepaid clinical 1,373 2,039
Prepaid other 225 96
Other current assets 32 34
Total prepaid expenses and other current assets $ 2,328 $ 3,513