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Net Loss Per Common Share (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of antidilutive shares excluded from computation of diluted net loss per share
    March 31,
2017
    March 31,
2018
 
Stock options     387,519       708,400  
Convertible preferred stock     1,698       1,698  
Series A preferred stock     -       132,000  
Common stock warrants     -       7,490,500  
Total shares excluded from calculation     389,217       8,332,598