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Stock Compensation (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	$ 440	$ 716	$ 1,148	$ 1,862
Research and development [Member]
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	259	359	512	732
General and administrative [Member]
Summary of the stock-based compensation expense
Stock-based compensation expense recognized	$ 181	$ 357	$ 636	$ 1,130

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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