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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Research and Development Expense [Member]
Share-based compensation	$ 1,247	$ 92	$ 3,690	$ 348
General and Administrative Expense [Member]
Share-based compensation	840	117	2,155	382
Cost of Revenues [Member]
Share-based compensation	$ 220	$ 0	$ 220	$ 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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