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Condensed Consolidated Statements Of Operations (Parenthetical) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Cost Of Revenue [Member]
Stock-based compensation expense	$ 657	$ 279	$ 1,334	$ 809
Research And Development [Member]
Stock-based compensation expense	1,245	1,261	4,013	3,116
Sales And Marketing [Member]
Stock-based compensation expense	1,027	1,057	3,086	2,964
General And Administrative [Member]
Stock-based compensation expense	$ 2,358	$ 2,312	$ 9,130	$ 5,249

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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