Goodwill and Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014	[1]
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 19,432		$ 19,432		$ 11,527
Amortization of intangible assets	826	$ 485	2,308	$ 646
SocialMoov [Member]
Finite Lived Intangible Assets [Line Items]
Goodwill	$ 19,432		$ 19,432

[1] Derived from our audited consolidated financial statements as of December 31, 2014.