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Equity-Based Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Total	$ 1,554	$ 1,493	$ 2,570	$ 2,157
Cost of revenue
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Total	110		165
Sales and marketing
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Total	304		507
Product development
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Total	329		584
General and administrative
Non-cash equity-based compensation expense related to the 2012 Plan and 2012 ESPP
Total	$ 811	$ 1,493	$ 1,314	$ 2,157

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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