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Stock Compensation Plans - General (Details) - shares
12 Months Ended 72 Months Ended
Dec. 31, 2016
Dec. 31, 2014
Dec. 31, 2010
Dec. 31, 2016
Dec. 31, 2008
Employee stock options          
Stock Awards Vesting          
Expiration period     10 years 7 years  
2008 Equity Incentive Plan          
Stock Awards Vesting          
Maximum number of shares available for grants   5,000,000     2,000,000
Term of plan, as amended and restated   10 years      
2008 Equity Incentive Plan | Incentive Stock Options          
Stock Awards Vesting          
Maximum number of shares available for grants 1,500,000     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%        
2008 Equity Incentive Plan | Employee and nonemployee stock options | Minimum          
Stock Awards Vesting          
Expiration period 7 years        
2008 Equity Incentive Plan | Employee and nonemployee stock options | Maximum          
Stock Awards Vesting          
Expiration period 10 years        
2008 Equity Incentive Plan | Stock appreciation rights | Minimum          
Stock Awards Vesting          
Expiration period 7 years        
2008 Equity Incentive Plan | Stock appreciation rights | Maximum          
Stock Awards Vesting          
Expiration period 10 years        
Prior Plans | Employee and nonemployee stock options          
Stock Awards Vesting          
Expiration period 10 years        
Prior Plans | Employee and nonemployee stock options | Minimum          
Stock Awards Vesting          
Vesting period 6 months