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Equity Incentive Plans and Stock-Based Compensation (Details 2) (Stock Option Plans, USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Mar. 30, 2012
Stock Option Plans
      
Number of Shares      
Outstanding, at the beginning of the period (in shares) 14,587,596    
Options granted (in shares) 1,937,002 1,633,701  
Options exercised (in shares) (11,467)    
Stock options forfeited (in shares) (136,993)    
Outstanding, at the end of the period (in shares) 16,376,138    
Vested or expected to vest at the end of the period (in shares) 15,699,805    
Options exercisable at the end of the period (in shares) 10,806,897    
Weighted Average Exercise Price      
Outstanding at the beginning of the year (in dollars per shares) $ 19.73    
Options granted (in dollars per share) $ 7.30    
Options exercised (in dollars per share) $ 4.67    
Options forfeited (in dollars per share) $ 17.86    
Outstanding at the end of the period (in dollars per shares) $ 18.28    
Vested or expected to vest at the end of the period (in dollars per share) $ 18.46    
Options exercisable at the end of the period (in dollars per share) $ 20.18    
Weighted Average Remaining Contractual Term (in years)      
Outstanding (in years) 5.77    
Vested or expected to vest (in years) 5.63    
Options exercisable (in years) 4.23    
Aggregate Intrinsic Value      
Outstanding $ 497    
Vested or expected to vest 497    
Options exercisable $ 497    
Closing stock price (in dollars per share)     $ 6.45
Total number of in-the-money outstanding (in shares) 250,967    
Total number of in-the-money exercisable (in shares) 250,967