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Segment Information
3 Months Ended
Mar. 31, 2014
Segment Reporting [Abstract]  
Segment Information
Segment Information
We operate as one operating segment, which is the business of discovering, developing, manufacturing and marketing therapies for the treatment of multiple sclerosis and other autoimmune disorders, neurodegenerative diseases and hemophilia and, therefore, our chief operating decision-maker manages the operations of our company as a single operating segment.