Goodwill and Intangible Assets - Schedule of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Balance at December 31, 2015	$ 19,417	[1]
Add: Payment of contingent consideration for SocialMoov acquisition	93
Add: Other adjustments to goodwill	(94)
Balance at September 30, 2016	$ 19,416

[1] Derived from our audited consolidated financial statements as of December 31, 2015.