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Summary of Significant Accounting Policies (Details 4) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Intangible Assets      
Estimated useful lives of the patents 10 years 10 years  
Product Sales      
Period subsequent to expiry date for accepting damaged or defective product 12 months    
Revenue Recognition      
Milestone revenues recorded $ 1.1 $ 0.8 $ 0
Computer equipment
     
Property and equipment      
Average useful lives 3 years    
Software
     
Property and equipment      
Average useful lives 3 years    
Lab and office equipment | Minimum
     
Property and equipment      
Average useful lives 5 years    
Lab and office equipment | Maximum
     
Property and equipment      
Average useful lives 10 years    
Furniture
     
Property and equipment      
Average useful lives 7 years