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Stock-Based Compensation (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Stock-based compensation expense
Total stock-based compensation	$ 223	$ 132	$ 435	$ 266
Research and development [Member]
Stock-based compensation expense
Total stock-based compensation	67	24	129	56
General and administrative [Member]
Stock-based compensation expense
Total stock-based compensation	$ 156	$ 108	$ 306	$ 210

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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