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Basis of Presentation (Accounting for Share-Based Compensation) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Basis of Presentation [Line Items] |  |  |  |
Share-based compensation expense total | $ 3,027 | $ 1,492 | $ 5,093 | $ 2,616
Research and development expenses |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Share-based compensation expense total | 956 | 448 | 1,645 | 834
General and administrative expenses |  |  |  |
Basis of Presentation [Line Items] |  |  |  |
Share-based compensation expense total | $ 2,071 | $ 1,044 | $ 3,448 | $ 1,782

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- Details
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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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