Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation (Accounting for Share-Based Compensation) (Details)

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Basis of Presentation (Accounting for Share-Based Compensation) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Basis of Presentation [Line Items]        
Share-based compensation expense total $ 3,702 $ 1,533 $ 8,795 $ 4,149
Research and development expenses
       
Basis of Presentation [Line Items]        
Share-based compensation expense total 1,169 438 2,814 1,272
General and administrative expenses
       
Basis of Presentation [Line Items]        
Share-based compensation expense total $ 2,533 $ 1,095 $ 5,981 $ 2,877