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Stockholders' Equity - Restricted Stock Awards (Details) - USD ($)
9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Restricted stock, shares issued during period (in shares) 745,392  
Restricted Stock Units (RSUs) [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, vested in period, fair value $ 1,285,578  
Granted, weighted average grant date fair value (in USD per share) $ 1.59 $ 4.06
Restricted Stock [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Equity instruments other than options, vested in period, fair value $ 596,314  
Granted, weighted average grant date fair value (in USD per share) $ 0.80