Business Combinations - Summary of Fair Values of Tangible Assets Acquired, Liabilities Assumed, Intangible Assets and Residual Goodwill (Detail) - Jun. 30, 2015 - USD ($) $ in Thousands	Total
Business Acquisition [Line Items]
Tangible assets acquired	$ 2,829
Liabilities assumed (see Note 5)	(3,863)
Total purchase price	13,195
Developed technology [Member]
Business Acquisition [Line Items]
Developed technology	$ 3,800
Developed technology	5 years
Customer relationships [Member]
Business Acquisition [Line Items]
Developed technology	$ 2,080
Developed technology	4 years
Tradename [Member]
Business Acquisition [Line Items]
Developed technology	$ 260
Developed technology	3 years
SocialMoov [Member]
Business Acquisition [Line Items]
Goodwill	$ 8,089
Goodwill	Indefinite