Stock-based Awards (Details 3) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Stock-based Compensation Cost
Stock-based compensation expense	$ 7,531	$ 9,440	$ 26,151	$ 20,978
Amount capitalized to internal software use	389	331	1,064	947
Total stock-based compensation cost	7,920	9,771	27,215	21,925
Cost of revenue
Stock-based Compensation Cost
Stock-based compensation expense	217	134	581	297
Sales and marketing
Stock-based Compensation Cost
Stock-based compensation expense	1,131	1,413	3,739	3,757
Technology and development
Stock-based Compensation Cost
Stock-based compensation expense	889	2,069	3,042	3,933
General and administrative
Stock-based Compensation Cost
Stock-based compensation expense	$ 5,294	$ 5,824	$ 18,789	$ 12,991

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.

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