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Share-Based Payments (Details 2) (USD $)	12 Months Ended
Share-Based Payments (Details 2) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Share-based Payments
Stock-based compensation recognized	$ 339,000	$ (82,000)	$ 297,000
Research and development
Share-based Payments
Stock-based compensation recognized	208,000	63,000	53,000
Selling, general and administrative
Share-based Payments
Stock-based compensation recognized	$ 131,000	$ (145,000)	$ 244,000

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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