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Common Stock and Warrant Issuances (Tables)
6 Months Ended
Jun. 30, 2018
Equity [Abstract]  
Summary of Warrant Outstanding

The following table summarizes information about shares issuable under warrants outstanding at June 30, 2018:

 

    Warrant
shares
outstanding
    Weighted
average
exercise price
    Weighted average remaining life     Intrinsic value  
Outstanding at January 1, 2018     13,720,742     $ 1.49                  
Issued     -                          
Additional warrants issued for trigger of anti-dilution protection     1,000,000     $ 0.40                  
Exercised     (5,179,947 )   $ 0.93                  
Expired or cancelled     (100,000 )   $ 3.75                  
Outstanding at June 30, 2018     9,440,795     $ 0.79       2.92     $ 1,352  
                                 
Exercisable at June 30, 2018     9,440,795     $ 0.79       2.92     $ 1,352