Stock Based Compensation (Allocated Stock-based Compensation) (Details) (USD $)
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3 Months Ended | 6 Months Ended | ||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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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]
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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]
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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 |