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Condensed Consolidated Statements of Operations (Unaudited) (Parentheticals) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cost of Revenue [Member]
Stock-based compensation expense	$ 95	$ 63
Research and Development [Member]
Stock-based compensation expense	1,266	1,427
Selling, General and Administrative [Member]
Stock-based compensation expense	$ 1,954	$ 1,497

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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