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Net Loss per Common Share (Tables)
6 Months Ended
Jun. 30, 2021
Net Loss per Common Share  
Schedule of Basic and Diluted Net Loss Per Share

The following potentially dilutive securities have not been included in the computation of diluted net loss per share for the three months ended June 30, 2020 and 2021, as the result would be anti-dilutive:

 

June 30, 

June 30, 

    

2020

    

2021

Stock options

 

134,594

 

731,761

6% convertible exchangeable preferred stock

 

85

 

85

Series A preferred stock

 

6,600

 

6,600

Series B preferred stock

 

 

1,188,725

Common stock warrants

 

4,370,525

 

3,234,379

Total shares excluded from calculation

 

4,511,804

 

5,161,550