Other Income (Expense), Net - Schedule of Other Income (Expense), Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Other Income:
Interest income	$ 701	$ 163	$ 386
Foreign currency forward contract gains, net	0	0	12
Foreign currency exchange gains, net	5	8	0
Total other income	706	171	398
Other Expense:
Skyfence holdback liability accretion	(212)	(186)	0
Foreign currency exchange losses, net	(322)	0	(373)
Other	(574)	(205)	(150)
Total other expense	(1,108)	(391)	(523)
Total other income (expense), net	$ (402)	$ (220)	$ (125)