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
Mar. 31, 2014
Mar. 31, 2013
Basis of Presentation [Line Items]    
Share-based compensation expense total $ 2,067 $ 1,124
Research and development expenses
   
Basis of Presentation [Line Items]    
Share-based compensation expense total 689 386
General and administrative expenses
   
Basis of Presentation [Line Items]    
Share-based compensation expense total $ 1,378 $ 738