Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Summary of Interest Expense and Income (Detail)

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Summary of Significant Accounting Policies - Summary of Interest Expense and Income (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Interest Income (Expense), Net [Abstract]        
Interest expense $ 349 $ 3 $ 901 $ 46
Interest income (578) (93) (989) (93)
Interest income, net $ (229) $ (90) $ (88) $ (47)