Business Combinations - Additional Information (Detail) - USD ($) shares in Thousands, $ in Thousands			3 Months Ended	12 Months Ended
	Feb. 12, 2015	Jun. 02, 2014	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Purchase price attributable to goodwill				$ 19,318	$ 19,417
Number of RSUs, granted				3,123	1,185	777
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
Purchase price of net liabilities assumed	1,761			$ 3,382
Cash acquired from acquisition	1,120
Purchase price attributable to intangible assets	6,140
Purchase price attributable to goodwill	$ 7,789			$ 7,789
Additional shares of common stock issued in connection with acquisition	927
Common stock issued in connection with acquisition closing date fair value	$ 6,487
Additional shares of common stock issued in connection with acquisition, description				In addition, the Company agreed to issue 927 shares of common stock at future dates as defined in the Share Purchase Agreement, valued at $6,487 upon the closing date of the acquisition using the Company’s closing date stock price immediately preceding the acquisition, to existing employee shareholders of SocialMoov in connection with the acquisition, which are conditioned upon such employees’ continuous employment with the Company. These shares have been excluded from the purchase consideration and are being recognized as post-acquisition stock-based compensation expense over the employees’ requisite service periods. The Company issued half of these shares in February 2016 and the remaining half in February 2017.
SocialMoov [Member] | RSUs [Member]
Business Acquisition [Line Items]
Number of RSUs, granted	219
Value of RSUs, granted	$ 959
NowSpots, Inc. [Member]
Business Acquisition [Line Items]
Acquisition date				Jun. 02, 2014
Business acquisition, purchase price		$ 16,470
Number of common stock, shares at the date of acquisition		1,119
Consideration in common stock		$ 11,195
Common stock value at the date of acquisition		5,275
Purchase price of net liabilities assumed		4,713		$ 5,082
Cash acquired from acquisition		1,124
Purchase price attributable to intangible assets		8,530
Purchase price attributable to goodwill		$ 11,529		$ 11,529
Additional shares of common stock issued in connection with acquisition		630
Common stock issued in connection with acquisition closing date fair value		$ 6,301