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Common Stock, Preferred Stock and Warrants (Tables)
6 Months Ended
Jun. 30, 2019
Equity [Abstract]  
Summary of Warrant Outstanding

The following table summarizes information about shares issuable under warrants outstanding during the six months ended June 30, 2019:

 

   Warrant
shares
outstanding
   Weighted
average
exercise price
   Weighted average remaining life   Intrinsic value 
Outstanding at January 1, 2019   5,477,975   $1.01           
Issued   -    -           
Exercised   (4,000,000)  $1.12           
Expired or cancelled   (27,975)  $0.79           
Outstanding at June 30, 2019   1,450,000   $0.72    0.82   $- 
                     
Exercisable at June 30, 2019   1,450,000   $0.72    0.82   $-