Business Combination - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands			3 Months Ended	9 Months Ended
	Feb. 29, 2016	Feb. 12, 2015	Mar. 31, 2016	Sep. 30, 2016
Business Acquisition [Line Items]
Number of RSUs, granted				1,534
SocialMoov [Member]
Business Acquisition [Line Items]
Acquisition date				Feb. 12, 2015
Business acquisition, purchase price		$ 13,288
Number of common stock, shares at the date of acquisition		636
Consideration in common stock		$ 4,337
Common stock value at the date of acquisition		8,858
Cash paid as contingent consideration			$ 93
Held in escrow to secure indemnification obligations		$ 1,894
Additional shares of common stock issued in connection with acquisition	463	927
Common stock issued in connection with acquisition closing date fair value		$ 6,487
SocialMoov [Member] | RSUs [Member]
Business Acquisition [Line Items]
Number of RSUs, granted		219
Value of RSUs, granted		$ 959