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Basis of Presentation (Accounting for Share-Based Compensation) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 2,836	$ 3,702	$ 9,511	$ 8,795
Research and development expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	957	1,169	3,131	2,814
General and administrative expenses
Basis of Presentation [Line Items]
Share-based compensation expense total	$ 1,879	$ 2,533	$ 6,380	$ 5,981

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- Definition

Basis of presentation.

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- Definition

The amount of expense, net of income tax, 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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No definition available.

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