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Consolidated Statements of Operations (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based compensation	$ 7,592,000	$ 5,854,000	$ 4,725,000
Cost of revenues [Member]
Share-based compensation	1,178,000	1,009,000	798,000
Research and development [Member]
Share-based compensation	3,132,000	2,401,000	1,808,000
Selling, general and administrative [Member]
Share-based compensation	$ 3,282,000	$ 2,444,000	$ 2,119,000

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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