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Stock Based Compensation (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Sep. 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           $ 1,700,000
Unrecognized compensation cost, recognized as expense over a weighted-average period     10 months 20 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) 2,535,651   2,913,295   2,913,295 2,535,651
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Risk-free interest rate     2.32% 1.72%    
Expected volatility     90.70% 74.90%    
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)     2,913,295      
Granted (in shares)     35,001 79,167    
Exercised, forfeited or expired (in shares)     (412,645)      
Outstanding at end of period (in shares) 2,535,651   2,535,651   2,913,295  
Options exercisable at end of period (in shares) 2,059,784   2,059,784      
Weighted-Average Exercise Price Options [Abstract]            
Outstanding at beginning of period (in dollars per share)     $ 14.22      
Granted (in dollars per share)     3.96      
Exercised, forfeited or expired (in dollars per share)     12.90      
Outstanding at end of period (in dollars per share) $ 14.28   14.28   $ 14.22  
Options exercisable at end of period (in dollars per share) $ 16.02   $ 16.02      
Stock Options [Member] | Minimum [Member]            
Share-based compensation arrangement by share-based payment award, fair value assumptions and methodology [Abstract]            
Expected lives     6 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) 2,432,317   2,813,295   2,813,295 2,432,317
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)     2,813,295      
Granted (in shares)     31,667      
Exercised, forfeited or expired (in shares)     (412,645)      
Outstanding at end of period (in shares) 2,432,317   2,432,317   2,813,295  
Options exercisable at end of period (in shares) 1,956,450   1,956,450      
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) 103,334   100,000   100,000 103,334
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)     100,000      
Granted (in shares)     3,334      
Exercised, forfeited or expired (in shares)     0      
Outstanding at end of period (in shares) 103,334   103,334   100,000  
Options exercisable at end of period (in shares) 103,334   103,334      
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 $ 83,943 $ 0 $ 249,089 $ 0    
Warrants [Member]            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of warrants issued (in shares)   83,334   83,334    
Exercise price of warrants (in dollars per share)   $ 11.34   $ 11.34    
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) 100,000   100,000     100,000
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) 100,000   100,000      
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) 2,500,000   2,500,000     2,500,000
Share-based compensation, shares available for future grant (in shares)           2,000,000
Number of Options (Employees and Non-Employees) [Abstract]            
Outstanding at end of period (in shares) 2,500,000   2,500,000      
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)           400,000
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)         387,597  
Vesting period         3 years  
Share based compensation of fair value of the restricted stock on the grant         $ 1,000,000