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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, 2013
Mar. 31, 2012
Mar. 28, 2013
Mar. 31, 2013
Stock Options with Market Condition
Dec. 31, 2012
Stock Options with Market Condition
Number of Shares          
Outstanding, at the beginning of the period (in shares) 13,094,815     1,535,000 1,535,000
Options granted (in shares) 1,619,437 1,937,002      
Options exercised (in shares) 0        
Options forfeited (in shares) (893,744)        
Outstanding, at the end of the period (in shares) 13,820,508     1,535,000 1,535,000
Vested or expected to vest at the end of the period (in shares) 12,533,217        
Options exercisable at the end of the period (in shares) 5,945,597        
Weighted Average Exercise Price          
Outstanding at the beginning of the year (in dollars per shares) $ 12.79        
Options granted (in dollars per share) $ 5.46        
Options exercised (in dollars per share) $ 0        
Options forfeited (in dollars per share) $ 11.20        
Outstanding at the end of the period (in dollars per shares) $ 12.03        
Vested or expected to vest at the end of the period (in dollars per share) $ 12.48        
Options exercisable at the end of the period (in dollars per share) $ 19.05        
Weighted Average Remaining Contractual Term          
Outstanding 6 years 5 months 9 days        
Vested or expected to vest 6 years 2 months 16 days        
Options exercisable 3 years 9 months 26 days        
Aggregate Intrinsic Value          
Outstanding $ 1,898        
Vested or expected to vest 1,549        
Options exercisable $ 36        
Closing stock price (in dollars per share)     $ 5.61    
Total number of in-the-money outstanding (in shares) 2,900,931        
Total number of in-the-money exercisable (in shares) 32,761