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Changes in Alliance Agreement Liability (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2007
Alliance Agreement [Line Items]        
Beginning balance $ 20,667 $ 22,584   $ 9,300
Payment of refundable portion of IBM payments (20,667)      
Costs related to fulfillment of technical enablement milestones   (1,917) (9,900)  
Ending balance   $ 20,667 $ 22,584 $ 9,300