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Net Loss Per Common Share (Tables)
9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Schedule of antidilutive shares excluded from computation of diluted net loss per share
   

September 30,

2016

   

September 30,

2017

 
Stock options     393,723       381,786  
6% Convertible Exchangeable preferred stock     1,698       1,698  
Series A convertible preferred stock     -       332,000  
Common stock warrants     -       7,590,000  
Total shares excluded from calculation     395,421       8,305,484