Summary of Significant Accounting Policies - Components of Other Expense, Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Regulatory Assets [Abstract]
Interest expense (income), net	$ 18	$ 15	$ (2)
Accretion of contingent earnout consideration	1,710
Loss on foreign exchange transactions	285	166	94
Other expense, net	$ 2,013	$ 181	$ 92