Stock-based Awards (Details 3) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Stock-based Compensation Cost
Stock-based compensation expense	$ 9,167	$ 7,396	$ 18,620	$ 11,540
Amount capitalized to internal software use	344	321	675	614
Total stock-based compensation cost	9,511	7,717	19,295	12,154
Cost of revenue
Stock-based Compensation Cost
Stock-based compensation expense	187	113	364	163
Sales and marketing
Stock-based Compensation Cost
Stock-based compensation expense	1,218	1,307	2,608	2,344
Technology and development
Stock-based Compensation Cost
Stock-based compensation expense	1,227	1,156	2,153	1,865
General and administrative
Stock-based Compensation Cost
Stock-based compensation expense	$ 6,535	$ 4,820	$ 13,495	$ 7,168

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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