Acquisitions - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions					12 Months Ended
	Oct. 30, 2015	Oct. 10, 2014	Aug. 04, 2014	Jan. 02, 2014	Dec. 31, 2015
Shopmium
Business Acquisition [Line Items]
Total acquisition consideration	$ 19.5
Cash payments for purchase of assets	$ 16.5
Number of shares Issuable	278,639
Total acquisition consideration (Values)	$ 1.5
Share issuable price	$ 5.54
Contingent consideration payable in cash	$ 4.8
Business combination, contingent consideration issuable date					Mar. 31, 2018
Shopmium | Scenario One
Business Acquisition [Line Items]
Business combination, contingent consideration milestones date					Dec. 31, 2016
Shopmium | Scenario Two
Business Acquisition [Line Items]
Business combination, contingent consideration milestones date					Dec. 31, 2017
Padopolis, Inc
Business Acquisition [Line Items]
Total acquisition consideration		$ 1.7
Eckim, LLC
Business Acquisition [Line Items]
Total acquisition consideration			$ 19.3
Cash payments for purchase of assets			$ 12.5
Number of shares Issuable					335,891
Share issuable price					$ 6.82
Business combination, contingent consideration milestones date			Dec. 31, 2015
Business combination, contingent consideration issuable date			Apr. 30, 2016
Eckim, LLC | Maximum
Business Acquisition [Line Items]
Contingent consideration, value of shares issuable			$ 6.8
Yub, Inc
Business Acquisition [Line Items]
Total acquisition consideration				$ 10.1
Number of shares Issuable				1,000,040
Share issuable price				$ 10.05