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Segment Information
3 Months Ended
Mar. 31, 2012
Segment Information [Abstract]  
Segment Information
19. Segment Information

We operate as one business segment, which is the business of discovering, developing, manufacturing and marketing therapies for the treatment of neurodegenerative diseases, hemophilia and autoimmune disorders and therefore, our chief operating decision-maker manages the operations of our Company as a single operating segment.