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Stockholders' Equity - Outstanding and Reserved Shares of Common Stock for Future Issuance (Detail)
Sep. 30, 2014
Dec. 31, 2013
Common stock outstanding and reserved shares of common stock for future issuance    
Options outstanding 17,824,088 23,399,374
Total reserved shares of common stock for future issuance 48,888,873  
2005 Stock Option Plan [Member]
   
Common stock outstanding and reserved shares of common stock for future issuance    
Total reserved shares of common stock for future issuance 0 [1]  
2012 Equity Incentive Plan [Member]
   
Common stock outstanding and reserved shares of common stock for future issuance    
Total reserved shares of common stock for future issuance 15,124,772 [1]  
2012 Employee Stock Purchase Plan [Member]
   
Common stock outstanding and reserved shares of common stock for future issuance    
Total reserved shares of common stock for future issuance 6,529,516 [1]  
Stock Options [Member]
   
Common stock outstanding and reserved shares of common stock for future issuance    
Options outstanding 17,824,088  
Restricted Stock Units (RSUs) [Member]
   
Common stock outstanding and reserved shares of common stock for future issuance    
RSUs 9,410,497 5,427,509
[1] Refer to Note 12 for a description of these plans.