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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Costs Capitalized Prepaid And Other Assets Disclosure [Abstract]    
Short-term deposits $ 663 $ 1,286
Prepaid clinical supplies 101 220
Interest receivable on investments 253 377
Reimbursable costs 797 1,029
Prepaid insurance 188 192
Other 332 258
Total prepaid expenses and other current assets $ 2,334 $ 3,362