Acquisition and Goodwill - Summary of Goodwill Activity (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Business Combination, Goodwill [Abstract]
Beginning balance	$ 1,676	$ 0
Goodwill acquired during the period	0	1,676
Ending balance	$ 1,676	$ 1,676