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Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid insurance $ 335 $ 734
Prepaid clinical 5 102
Prepaid other 66 45
Insurance receivable 214 245
Other current assets 17 54
Total prepaid expenses and other current assets $ 637 $ 1,180