Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Other Income and Expenses [Abstract]
Interest and amortization expense	$ (604)	$ (622)	$ (1,201)	$ (1,310)
Foreign exchange loss	(391)	(3)	(402)	(9)
Investment income	377	143	673	289
Other income (expense), net	$ (618)	$ (482)	$ (930)	$ (1,030)