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Stock Options and Stock-based Employee Compensation (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Stock options and awards outstanding (in shares) 5,428,000 3,997,000 2,438,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Stock options outstanding, beginning of period (in shares) 3,997,000 2,438,000 943,000
Granted (in shares) 1,928,000 1,724,000 1,771,000
Exercised (in shares) (18,000) (3,000)  
Forfeited or expired (in shares) (479,000) (162,000) (276,000)
Stock options outstanding, end of period (in shares) 5,428,000 3,997,000 2,438,000
Exercisable at end of period (in shares) 2,346,000    
Weighted Average Exercise Price [Roll Forward]      
Outstanding, beginning of period (in dollars per share) $ 11.11 $ 17.97 $ 56.06
Granted (in dollars per share) $ 2.30 $ 2.63 $ 1.84
Exercised (in dollars per share) $ 1.85 $ 1.83  
Forfeited or expired (in dollars per share) $ 28.09 $ 24.39 $ 44.95
Outstanding, end of period (in dollars per share) $ 6.51 $ 11.11 $ 17.97
Exercisable at end of period (in dollars per share) $ 12.01    
Outstanding, weighted average remaining contractual term 8 years    
Exercisable, weighted average remaining contractual term 6 years 10 months 24 days    
Options and awards granted, weighted average grant date fair value (in dollars per share) $ 1.79 $ 2.02 $ 1.45
Proceeds from Stock Options Exercised $ 34,000 $ 6,000  
Options, outstanding, total intrinsic value 800,000    
Options, vested, total intrinsic value 500,000    
Options, exercisable, total intrinsic value $ 500,000    
Restricted Stock Awards (RSAs) [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Unvested RSAs outstanding (in shares) 18,936    
2011 Equity Incentive Plan [Member]
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized (in shares) 7,800,000    
Stock options and awards outstanding (in shares) 4,919,333    
Available for future grants (in shares) 2,894,374    
Duration of continuous service 3 years    
Term of award 10 years    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Stock options outstanding, end of period (in shares) 4,919,333