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Stock Based Compensation (Allocated Stock-based Compensation) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 1,452,000 $ 519,000 $ 3,136,000 $ 883,000
Research and Development [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense 187,000 145,000 347,000 258,000
Selling, General and Administrative [Member]
       
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]        
Allocated share based compensation expense $ 1,265,000 $ 374,000 $ 2,789,000 $ 625,000