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Stock Award Plans - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 1 Months Ended 12 Months Ended 0 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended
Mar. 31, 2004
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2013
Minimum
Mar. 31, 2004
Maximum
Dec. 31, 2013
Maximum
Mar. 03, 2011
2004 Equity Incentive Plan
Dec. 31, 2013
2004 Equity Incentive Plan
Mar. 31, 2004
Employee Stock Purchase Plans
Dec. 31, 2013
Employee Stock Purchase Plans
Dec. 31, 2013
2013 Equity Incentive Plan
May 23, 2013
2013 Equity Incentive Plan
Dec. 31, 2013
Stock Options
Dec. 31, 2013
Restricted Stock Units (RSUs)
May 23, 2013
Performance Based Stock Options
Dec. 31, 2013
Performance Based Stock Options
May 23, 2013
Performance Based Restricted Stock Units
Mar. 07, 2013
Performance Based Restricted Stock Units
Dec. 31, 2013
Performance Based Restricted Stock Units
Dec. 31, 2013
Restricted Stock
May 17, 2012
Performance based restricted stock units
May 17, 2012
Time Based Awards
Aug. 01, 2010
Stock Option And Award Plans
Jul. 09, 2008
Stock Option And Award Plans
Dec. 31, 2013
Consultant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                                    
Equity incentive plan, shares                         21,500,000                          
Stock option grants vest exercisable rate   25.00%                                                
Restricted stock vesting rate   25.00%           50.00%                                    
Vesting period   4 years                       36 months             4 years          
Performance mile stone period range         11 months   96 months                                      
Options granted expiry term             10 years                                      
Options granted   6,919,900                           5,598,100           3,942,500 3,892,500      
Restricted stock units granted   8,481,459           1,177,300                   1,687,900 5,846,000              
Weighted average grant date fair value of the stock options granted   $ 3.26 $ 0.99 $ 2.04                       $ 3.05           $ 0.60 $ 1.12      
Weighted average grant date fair value of the restricted stock granted   $ 3.93                               $ 6.85 $ 2.81              
Options vesting percentage                                             25.00%      
Options vesting date                                             May 01, 2014      
Stock options granted               1,467,500                                    
Stock based compensation expense related to stock award plans and the ESPP   $ 45,186,000 $ 13,292,000 $ 11,204,000       $ 8,200,000                                    
Outstanding option to purchase common stock                                                 5,417,840  
Option purchase                                                 4,493,509  
Restricted stock unit issued                                                 2,246,781  
Unamortized stock compensation expenses                                                 13,900,000  
Incremental stock compensation expenses                                               3,700,000    
Shares reserved for issuance                   2,000,000 2,679,007                              
Share reserve automatic increase each year                   700,000                                
Share reserve   700,000 700,000 700,000                                            
Share of common stock outstanding 1.00%                                                  
Shares reserved under ESPP           10.00%                                        
Shares sold to employees   463,290 422,260 282,816                                            
Options to purchase common stock   24,237,940 18,674,539           16,792,784     6,754,325                           203,700
Total intrinsic value of options exercised   3,100,000 1,000 443,000                                            
Cash received from the exercise of options   2,300,000 9,200 625,000                                            
Weighted-average remaining contractual term   6 years 10 months 2 days 7 years 9 months 7 days 7 years 9 months 18 days                                            
Restricted stock units expected to vest   8,761,363                                                
Weighted average grant date fair value   $ 3.40                                                
Total intrinsic value of restricted stock units expected to vest   45,600,000                                                
Total intrinsic value of restricted stock units vested   13,900,000 2,900,000 1,700,000                                            
Fair value of restricted stock units vested   14,900,000 3,000,000 1,600,000                                            
Unrecognized compensation cost related to non vested stock options                           $ 15,200,000 $ 23,200,000   $ 107,000     $ 3,700,000            
Weighted average vesting period for unrecognized compensation cost   1 year 7 months 6 days