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Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid insurance $ 1,021 $ 1,344
Prepaid clinical 1,398 2,039
Prepaid other 212 96
Other current assets 17 34
Total prepaid expenses and other current assets $ 2,648 $ 3,513