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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details 5) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Allocation of stock based compensation expense
Stock-based compensation expense	$ 1,668	$ 1,635
Cost of revenue
Allocation of stock based compensation expense
Stock-based compensation expense	1	76
Sales and marketing
Allocation of stock based compensation expense
Stock-based compensation expense	174	245
Research & development
Allocation of stock based compensation expense
Stock-based compensation expense	300	361
General and administrative
Allocation of stock based compensation expense
Stock-based compensation expense	$ 1,193	$ 953

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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