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Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Stock-based compensation expense	$ 21,603	$ 25,575	$ 9,196
Cost Of Revenue [Member]
Stock-based compensation expense	1,503	1,745	682
Research And Development [Member]
Stock-based compensation expense	4,828	5,966	2,657
Sales And Marketing [Member]
Stock-based compensation expense	4,500	4,555	1,739
General And Administrative [Member]
Stock-based compensation expense	9,538	13,309	4,118
Merger-Related And Other Expenses [Member]
Stock-based compensation expense	$ 1,234

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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