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Major Customers, Partnerships and Strategic Alliances - Juvenile Diabetes Research Foundation International - Additional Information (Detail) (Juvenile Diabetes Research Foundation International [Member], USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended
Mar. 31, 2012
Jan. 31, 2010
Dec. 31, 2012
Dec. 31, 2011
Oct. 31, 2006
Juvenile Diabetes Research Foundation International [Member]
          
Research and Development Arrangement, Contract to Perform for Others [Line Items]          
Agreement date         Oct. 31, 2006
Grant funding amount maximum under amended agreement   $ 3.0      
Received for work performed under agreement 0.8        
Revenues under the agreement     $ 0.8 $ 0.5