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Stock Based Compensation (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jun. 30, 2017
Employees and Directors [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Unrecognized compensation expense related to unvested stock options, granted           $ 2,400,000
Unrecognized compensation cost, recognized as expense over a weighted-average period     1 year 4 days      
Stock Options [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation, shares subject to stock options (in shares) 16,842,932   17,479,770   17,479,770 16,842,932
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Risk-free interest rate     2.04% 1.47%    
Expected volatility     85.50% 76.30%    
Expected lives     6 years      
Expected dividend yield     0.00% 0.00%    
Contractual term     10 years      
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at beginning of period (in shares)     17,479,770      
Granted (in shares)     10,000 425,000    
Exercised, forfeited or expired (in shares)     (646,847)      
Outstanding at end of period (in shares) 16,842,932   16,842,932   17,479,770  
Options exercisable at end of period (in shares) 12,255,168   12,255,168      
Weighted-Average Exercise Price Options [Abstract]            
Outstanding at beginning of period (in dollars per share)     $ 2.37      
Granted (in dollars per share)     0.41      
Exercised, forfeited or expired (in dollars per share)     3.16      
Outstanding at end of period (in dollars per share) $ 2.34   2.34   $ 2.37  
Options exercisable at end of period (in dollars per share) $ 2.75   $ 2.75      
Stock Options [Member] | Minimum [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Expected lives       5 years    
Stock Options [Member] | Maximum [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Expected lives       10 years    
Stock Options [Member] | Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation, shares subject to stock options (in shares) 16,242,923   16,879,770   16,879,770 16,242,923
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Estimated annualized forfeiture rate       10.00%    
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at beginning of period (in shares)     16,879,770      
Granted (in shares)     10,000      
Exercised, forfeited or expired (in shares)     (646,847)      
Outstanding at end of period (in shares) 16,242,923   16,242,923   16,879,770  
Options exercisable at end of period (in shares) 11,655,168   11,655,168      
Stock Options [Member] | Non-Employees [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation, shares subject to stock options (in shares) 600,000   600,000   600,000 600,000
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Estimated annualized forfeiture rate       0.00%    
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at beginning of period (in shares)     600,000      
Granted (in shares)     0      
Exercised, forfeited or expired (in shares)     0      
Outstanding at end of period (in shares) 600,000   600,000   600,000  
Options exercisable at end of period (in shares) 600,000   600,000      
Stock Options [Member] | Senior Management [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Estimated annualized forfeiture rate       2.00%    
Stock Options [Member] | Directors [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Estimated annualized forfeiture rate       0.00%    
Stock Options [Member] | Former Executive [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share based compensation expense   $ 1,900,000        
Restricted Stock [Member]            
Restricted Stock [Abstract]            
Restricted stock expense $ 83,029 $ 0 $ 165,146 $ 0    
Warrants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)   500,000   500,000    
Exercise price of warrants (in dollars per share)   $ 1.74   $ 1.74    
2000 Long Term Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Expiration date     Aug. 06, 2010      
Share-based compensation, shares subject to stock options (in shares) 400,000   400,000     400,000
Share-based compensation, shares available for future grant (in shares)           0
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at end of period (in shares) 400,000   400,000      
2008 Stock Incentive Plan [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation, shares subject to stock options (in shares) 16,400,000   16,400,000     16,400,000
Share-based compensation, shares available for future grant (in shares)           10,400,000
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at end of period (in shares) 16,400,000   16,400,000      
2008 Stock Incentive Plan [Member] | Restricted Stock [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Share-based compensation, outstanding stock options (in shares)           2,500,000
2008 Stock Incentive Plan [Member] | Restricted Stock [Member] | Chairman and Chief Executive Officer [Member]            
Restricted Stock [Abstract]            
Share based compensation arranged by share based payment award restricted stock granted (in shares)         2,325,581  
Vesting period         3 years  
Share based compensation of fair value of the restricted stock on the grant         $ 1,000,000