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Net Loss per Common Share (Tables)
3 Months Ended
Mar. 31, 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 March 31, 2020 and 2021, as the result would be anti-dilutive:

 

 

 

 

 

 

 

March 31, 

 

March 31, 

 

    

2020

    

2021

Stock options

 

99,957

 

676,352

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

 

374,525

 

3,234,379

Total shares excluded from calculation

 

481,167

 

5,106,141