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Stock Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Jun. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	$ 692	$ 592	$ 1,840	$ 2,454
Research and development [Member]
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	271	266	783	998
General and administrative [Member]
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	$ 421	$ 326	$ 1,057	$ 1,456

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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