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Basic and Diluted Net Loss Per Share - Outstanding Shares of Potentially Dilutive Securities Excluded from Calculation of Diluted Net Loss per Share (Detail)
6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 33,706,855 28,790,964
Options to purchase common stock
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 11,259,064 10,235,862
Common stock subject to repurchase
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 0 14,303
Restricted stock units
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 2,406,795 1,900,299
Warrants to purchase common stock
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 1,250,000 1,500,000
Shares of common stock to be issued upon conversion of the Notes
   
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Outstanding shares of potentially dilutive securities 18,790,996 15,140,500