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Loss Per Common Share (Tables)
12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Potentially Anti-dilutive Securities Not Considered in Calculation of Diluted Earnings Per Share Potentially dilutive securities not considered in the calculation of diluted earnings per share because losses caused their effect is anti-dilutive, are as follows at December 31, 2018 and 2017:

 

Year Ended December 31,

 

 

 

2018

 

 

 

2017

 

Convertible preferred stock

 

2,212,389

 

 

 

2,212,389

 

Stock warrants

 

825,000

 

 

 

825,000

 

Restricted units

 

5,031

 

 

 

165,210

 

 

 

3,042,420

 

 

 

3,202,509