Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Stock-Based Compensation (Detail)

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Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Stock-Based Compensation (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 9,984 $ 7,368 $ 4,215
Cost of net revenue [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 85 54 80
Research and development [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation 6,382 4,434 2,589
Selling, general and administrative [Member]
     
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]      
Stock-based compensation $ 3,517 $ 2,880 $ 1,546