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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Short-term deposits $ 893 $ 1,630
Prepaid insurance 385 168
Interest receivable on short-term investments 572 306
Reimbursable costs 741 262
Prepaid clinical supplies 316 461
Other 370 202
Total prepaid expenses and other current assets $ 3,277 $ 3,029