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STOCK-BASED COMPENSATION (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Non-cash compensation expense related to equity awards
Non-cash compensation expense	$ 1,433	$ 1,184
Cost of revenue
Non-cash compensation expense related to equity awards
Non-cash compensation expense	2	3
Selling and marketing expense
Non-cash compensation expense related to equity awards
Non-cash compensation expense	217	157
General and administrative expense
Non-cash compensation expense related to equity awards
Non-cash compensation expense	1,030	875
Product development
Non-cash compensation expense related to equity awards
Non-cash compensation expense	$ 184	$ 149

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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