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Share-Based Payments (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Share-based Payments
Stock-based compensation recognized	$ 337	$ 52
Research and development
Share-based Payments
Stock-based compensation recognized	114	15
Selling, general and administrative
Share-based Payments
Stock-based compensation recognized	$ 223	$ 37

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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