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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cost of revenue
Stock-based compensation	$ 19	$ 20	$ 575
Research and development
Stock-based compensation	6,597	9,546	10,519
Marketing, general and administrative
Stock-based compensation	$ 8,365	$ 12,980	$ 16,902

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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