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Net Loss Per Common Share (Tables)
6 Months Ended
Jun. 30, 2019
Earnings Per Share [Abstract]  
Schedule of antidilutive shares excluded from computation of diluted net loss per share
 
    June 30,
2018
    June 30,
2019
 
Stock options     796,856       2,342,268  
Convertible preferred stock     1,698       1,698  
Series A preferred stock     132,000       132,000  
Common stock warrants     7,490,500       7,490,500  
Total shares excluded from calculation     8,421,054       9,966,466