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Equity Incentive Plans and Stock-Based Compensation (Details 5) (USD $)
 1 Months Ended 12 Months Ended 1 Months Ended 12 Months Ended 12 Months Ended 1 Months Ended
Apr. 30, 2009
Dec. 31, 2012
Mar. 31, 2006
Dec. 31, 2012
Stock Compensation Plan
Dec. 31, 2011
Stock Compensation Plan
Dec. 31, 2010
Stock Compensation Plan
Apr. 30, 2012
Employee Stock Purchase Plans
Dec. 31, 2012
Employee Stock Purchase Plans
plan
Dec. 31, 2011
Employee Stock Purchase Plans
plan
Dec. 31, 2010
Employee Stock Purchase Plans
plan
Mar. 31, 2006
Employee Stock Purchase Plans
Dec. 31, 2012
Stock Option Plans
Dec. 31, 2011
Stock Option Plans
Dec. 31, 2010
Stock Option Plans
Dec. 31, 2012
Shares including nonvested equity stock and stock units
Dec. 31, 2011
Shares including nonvested equity stock and stock units
Dec. 31, 2010
Shares including nonvested equity stock and stock units
Dec. 31, 2012
Minimum
Stock Option Plans
Dec. 31, 2011
Minimum
Stock Option Plans
Dec. 31, 2010
Minimum
Stock Option Plans
Dec. 31, 2012
Maximum
Stock Option Plans
Dec. 31, 2011
Maximum
Stock Option Plans
Dec. 31, 2010
Maximum
Stock Option Plans
Apr. 30, 2009
Option One
Apr. 30, 2009
Option Two
Stock-Based Compensation                                                  
Required service period                                               60 months 48 months
Number of employee stock purchase plans               1 1 1                              
Minimum number of hours of weekly employment in order to qualify for eligibility in the plan               20 hours 20 hours 20 hours                              
Number of shares reserved under the 2006 Purchase Plan   21,400,000 8,400,000               1,600,000                            
Increase in shares approved for issuance 6,500,000           1,500,000                                    
Minimum number of months of employment in a fiscal year in order to qualify for eligibility in the plan               5 months 5 months 5 months                              
Offering period (in months)               6 months 6 months 6 months                              
Percentage of the price at the beginning of the offering period or price at the end of each offering period to derive purchase price               85.00% 85.00% 85.00%                              
Maximum share value per employee in any calendar year               $ 25,000 $ 25,000 $ 25,000                              
Shares issued under employee stock purchase plans               731,449 271,804 261,088                              
Weighted average price per share of shares issued (in dollars per share)               $ 4.21 $ 15.62 $ 14.78                              
Shares available for issuance       2,729,159       1,082,515                                  
Options granted (in shares)                       7,789,220 2,357,001 1,921,743                      
Estimated total grant date fair value                       32,700,000 24,200,000 24,900,000                      
Stock-based compensation               2,200,000 1,700,000 1,600,000   15,000,000 19,600,000 22,600,000 5,300,000 6,700,000 6,300,000                
Unrecognized compensation cost net of expected forfeitures               700,000       29,000,000     5,900,000                    
Expected weighted-average period for recognition of compensation cost (in years)                       2 years 9 months 19 days     2 years                    
Total fair value of options vested                       80,000,000 144,800,000 137,900,000                      
Total intrinsic value of options exercised                       200,000 6,200,000 9,100,000                      
Total proceeds received and receivable from employee stock option exercises                       1,000,000 7,400,000 12,900,000                      
Total fair value of nonvested equity stock units at grant date                             $ 4,800,000                    
Valuation assumptions                                                  
Dividend yield (as a percent)       0.00% 0.00% 0.00%                                      
Expected stock price volatility rate minimum (as a percent)               56.00% 56.00% 50.00%   57.00% 50.00% 49.00%                      
Expected stock price volatility rate maximum (as a percent)               63.00% 78.00% 54.00%   68.00% 75.00% 69.00%                      
Risk free interest rate (as a percent)               0.20% 0.10%                                
Risk free interest rate minimum (as a percent)                   0.20%   0.60% 1.40% 2.00%                      
Risk free interest rate maximum (as a percent)                   0.30%   0.90% 2.80% 3.20%                      
Expected term (in years)               0 years 6 months 0 years 6 months 0 years 6 months               5 years 6 months 6 years 5 years 10 months 24 days 5 years 8 months 12 days 6 years 1 month 6 days 6 years 2 months 12 days    
Weighted average grant date fair value (in dollars per share)                       $ 3.57 $ 10.27 $ 12.98                      
Weighted-average fair value of purchase rights granted under the purchase plan (in dollars per share)               $ 1.58 $ 6.16 $ 6.45         $ 6.43 $ 17.86 $ 21.87                
Nonvested equity stock and stock units                                                  
Nonvested at the beginning of the period (in shares)                             763,510 718,007 783,976                
Granted (in shares)                             742,009 374,838 302,312                
Vested (in shares)                             (393,383) (314,401) (314,045)                
Forfeited (in shares)                             (189,645) (14,934) (54,236)                
Nonvested at the end of the period (in shares)                             922,491 763,510 718,007                
Weighted-Average Grant-Date Fair Value                                                  
Nonvested at the beginning of the period (in dollars per share)                             $ 18.02 $ 18.23 $ 16.24                
Granted (in dollars per share)               $ 1.58 $ 6.16 $ 6.45         $ 6.43 $ 17.86 $ 21.87                
Vested (in dollars per share)                             $ 17.38 $ 18.15 $ 17.18                
Forfeited (in dollars per share)                             $ 11.77 $ 21.76 $ 15.76                
Nonvested at the end of the period (in dollars per share)                             $ 10.24 $ 18.02 $ 18.23