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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Stock Option Plans, USD $)
 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 0 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Jun. 29, 2012
Sep. 30, 2012
Stock Options with Market Condition
Sep. 30, 2012
Stock Options with Market Condition
Jun. 22, 2012
Stock Option Exchange Program
Sep. 30, 2012
Stock Option Exchange Program
Item
Stock-Based Compensation                  
Number of eligible employees                 333
Options surrendered in stock option exchange program as a percentage of the total options eligible for exchange                 87.00%
Minimum contractual term of options granted in stock option exchange program (in years)               5 years  
Options vested on the first anniversary of the grant date as a percentage of the total options granted in stock option exchange program                 33.33%
Vesting period             3 years   3 years
Vesting of awards from award date (in years)                 1 year
Vesting period of remaining awards from the first anniversary of the grant date (in months)                 24 months
Incremental compensation cost of new options granted                 $ 1,000,000
Unrecognized compensation cost of original options               19,900,000  
Unrecognized compensation cost 31,300,000   31,300,000            
Number of Shares                  
Outstanding, at the beginning of the period (in shares)     14,587,596            
Options granted (in shares) 2,590,711 487,550 7,592,911 2,199,761   1,745,000     2,840,986
Options exercised (in shares)     (221,934)            
Options forfeited (in shares)     (1,201,539)            
Options surrendered in stock option exchange program     (6,449,255)           (6,449,255)
Outstanding, at the end of the period (in shares) 14,307,779   14,307,779     1,485,000 1,485,000    
Vested or expected to vest at the end of the period (in shares) 12,492,826   12,492,826            
Options exercisable at the end of the period (in shares) 6,386,017   6,386,017            
Weighted Average Exercise Price                  
Outstanding at the beginning of the year (in dollars per shares)     $ 19.73            
Options granted (in dollars per share)     $ 5.83         $ 5.63  
Options exercised (in dollars per share)     $ 4.44            
Options forfeited (in dollars per share)     $ 11.74            
Options surrendered in stock option exchange program (in dollars per share) $ 21.11   $ 21.11            
Outstanding at the end of the period (in dollars per shares) $ 12.64   $ 12.64            
Vested or expected to vest at the end of the period (in dollars per share) $ 13.48   $ 13.48            
Options exercisable at the end of the period (in dollars per share) $ 19.29   $ 19.29            
Weighted Average Remaining Contractual Term                  
Outstanding     6 years 2 months 20 days            
Vested or expected to vest     5 years 10 months 2 days            
Options exercisable     3 years 7 months 27 days            
Aggregate Intrinsic Value                  
Outstanding 1,506,000   1,506,000            
Vested or expected to vest 1,173,000   1,173,000            
Options exercisable $ 0   $ 0            
Closing stock price (in dollars per share)         $ 5.54        
Total number of in-the-money outstanding (in shares) 1,123,424   1,123,424            
Total number of in-the-money exercisable (in shares) 0   0