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Share-Based Payments (Stock-based compensation recognized related to the grant of employee and non-employee stock options) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 31, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Share-based Payments
Stock-based compensation recognized	$ 432	$ 53	$ 769	$ 105
Research and development
Share-based Payments
Stock-based compensation recognized	131	14	239	29
Selling, general and administrative
Share-based Payments
Stock-based compensation recognized	$ 301	$ 39	$ 530	$ 76

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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