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Prepaid Expenses and Other Current Assets - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid insurance $ 471 $ 734
Prepaid clinical 217 102
Prepaid other 64 45
Insurance receivable 162 245
Other current assets 83 54
Total prepaid expenses and other current assets $ 997 $ 1,180