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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 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. + References No definition available. + Details
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