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Stock Compensation Plans (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Awards Vesting      
Number of plans 1    
Stock Options
     
Stock Awards Vesting      
Total grant date fair value of options granted $ 1,500,000 $ 1,500,000 $ 1,000,000
Dividend yield (as a percent) 0.00% 0.00% 0.00%
Expected volatility, minimum (as a percent)   42.00%  
Expected volatility, maximum (as a percent)   44.00%  
Expected volatility (as a percent) 31.00%   46.00%
Risk-free interest rates, minimum (as a percent)   0.58%  
Risk-free interest rates, maximum (as a percent)   0.90%  
Risk-free interest rates (as a percent) 0.78%   2.19%
Expected lives of options 4 years 4 years 4 years
Stock Options | Minimum
     
Stock Awards Vesting      
Expiration period 7 years    
Stock Options | Maximum
     
Stock Awards Vesting      
Expiration period 10 years    
Non-employee director stock options
     
Stock Awards Vesting      
Exercisable term 6 months    
Expiration period 10 years    
2008 Equity Incentive Plan
     
Stock Awards Vesting      
Maximum number of shares available for grants 2,000,000    
2008 Equity Incentive Plan | Minimum
     
Stock Awards Vesting      
Expiration period 7 years    
2008 Equity Incentive Plan | Maximum
     
Stock Awards Vesting      
Expiration period 10 years    
2008 Equity Incentive Plan | Incentive Stock Options
     
Stock Awards Vesting      
Maximum number of shares available for grants 1,500,000    
2008 Equity Incentive Plan | Incentive Stock Options | Ten percent employee | Minimum
     
Stock Awards Vesting      
Exercise price expressed as a percentage of fair market value 110.00%    
Employee Stock Option Plan
     
Stock Awards Vesting      
Maximum number of shares available for grants 8,238,640    
Employee Stock Option Plan | Minimum
     
Stock Awards Vesting      
Exercise price expressed as a percentage of fair market value 100.00%    
Employee Stock Option Plan | Incentive Stock Options
     
Stock Awards Vesting      
Expiration period 10 years    
Employee Stock Option Plan | Incentive Stock Options | Minimum
     
Stock Awards Vesting      
Exercisable term 6 months    
Non-Employee Director's Stock Option Plan
     
Stock Awards Vesting      
Total grant date fair value of options granted $ 25,000