Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Common Stock Reserved for Future Issuance (Detail)

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Stock-Based Compensation, Employee Benefit Plans and Convertible Preferred Stock - Common Stock Reserved for Future Issuance (Detail)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding 3,194 4,666
Common stock reserved for future issuance, Total 14,660  
2010 Equity Incentive Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock reserved for future issuance 6,516  
2010 Employee Stock Purchase Plan [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock reserved for future issuance 639  
Stock Option [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock options outstanding 3,194  
Restricted Stock Units And Restricted Stock Awards [Member]
   
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock reserved for future issuance 4,311