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Stock Award Plans - Additional Information (Detail) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended
Jun. 02, 2011
Mar. 03, 2011
Mar. 17, 2012
May 21, 2009
Mar. 31, 2004
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2012
Options Held
Dec. 31, 2012
Restricted Stock Unit
Dec. 31, 2012
Performance Based Stock Options
Dec. 31, 2012
Milestones Not Considered Probable Of Achievement
Mar. 31, 2004
Employee Stock Purchase Plans
Dec. 31, 2012
Employee Stock Purchase Plans
May 17, 2012
Performance Based Share Awards
May 17, 2012
Time Based Awards
Aug. 01, 2010
Stock Option And Award Plans
Jul. 09, 2008
Stock Option And Award Plans
Dec. 31, 2012
Consultant
Dec. 31, 2012
Minimum
Mar. 31, 2004
Maximum
Dec. 31, 2012
Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                                            
Stock option grants vest exercisable rate           25.00%                                
Restricted stock vesting rate           25.00%                                
Performance mile stone period range                                       13 months   96 months
Options vesting period           4 years                                
Options granted expiry term                                           10 years
Options granted           9,795,600                 3,942,500 3,892,500            
Weighted average grant date fair value of the stock options granted           $ 0.99 $ 2.04 $ 4.06             $ 0.60 $ 1.12            
Options vesting percentage                               25.00%            
Options vesting period                               May 01, 2014            
Stock based compensation expense related to stock award plans and the ESPP   $ 8,200,000       $ 13,292,000 $ 11,204,000 $ 13,580,000               $ 6,700,000            
Restricted stock units granted   1,177,300       1,371,455                                
Stock options granted   1,467,500                                        
Stock units vesting period   50.00%                                        
Common stock available for issuance 6,000,000   10,000,000 5,000,000                                    
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 2,674,003                
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           422,260 282,816 287,597                            
Options to purchase common stock           18,674,539 10,082,351                       243,033      
Total intrinsic value of options exercised           1,000 443,000 1,600,000                            
Cash received from the exercise of options           9,200 625,000 924,000                            
Weighted-average remaining contractual term           6 years 6 months 8 years 8 years 1 month 6 days                            
Restricted stock units expected to vest           3,254,819                                
Weighted average grant date fair value           $ 3.74                                
Total intrinsic value of restricted stock units expected to vest           7,500,000                                
Total intrinsic value of restricted stock units vested           2,900,000 1,700,000 10,500,000                            
Fair value of restricted stock units vested           3,000,000 1,600,000 11,400,000                            
Unrecognized compensation cost related to non vested stock options                 $ 12,200,000 $ 7,800,000 $ 107,000 $ 3,700,000                    
Weighted average vesting period for unrecognized compensation cost           2 years 3 months 18 days