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Condensed Consolidated Statements of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Cost of revenue [Member]
Recognized compensation expense related to non-vested RSAs	$ 293	$ 657	$ 826	$ 1,334
Research and development [Member]
Recognized compensation expense related to non-vested RSAs	1,365	1,245	4,189	4,013
Sales and marketing [Member]
Recognized compensation expense related to non-vested RSAs	790	1,027	2,404	3,086
General and administrative [Member]
Recognized compensation expense related to non-vested RSAs	$ 2,457	$ 2,358	$ 6,919	$ 9,130

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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