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Prepaid Expenses Other Assets Accrued Expenses and Other Liabilities - Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Prepaid Expense And Other Assets Current [Abstract]    
Prepaid insurance $ 734 $ 413
Prepaid clinical 102 208
Prepaid other 45 53
Insurance receivable 245 594
Other current assets 54 36
Total prepaid expenses and other current assets $ 1,180 $ 1,304