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Condensed Consolidated Statements of Operations (Unaudited) [Parenthetical] (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Selling, general and administrative [Member]
Stock-based compensation expense	$ 663	$ 45	$ 983	$ 91
Research and development [Member]
Stock-based compensation expense	$ 192	$ 0	$ 192	$ 0

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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