Goodwill and Intangible Assets - Schedule of Changes to Goodwill (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Intangible Assets Disclosure [Abstract]
Beginning balance	$ 10,010	$ 10,503
Translation adjustment	(1,668)	(493)
Ending balance	$ 8,342	$ 10,010