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Common Stock and Warrant Issuances (Tables)
12 Months Ended
Dec. 31, 2017
Equity [Abstract]  
Summary of Warrant Outstanding

The following table summarizes information about shares issuable under warrants outstanding at December 31, 2017:

 

    Warrant
shares
outstanding
    Weighted
average
exercise price
    Weighted average remaining life     Intrinsic value  
Outstanding at January 1, 2017     100,000     $ 3.75                  
Issued     17,674,289     $ 1.35                  
Exercised     (3,677,186 )   $ 0.74                  
Expired or cancelled     (376,361 )   $ 0.75                  
Outstanding at December 31, 2017     13,720,742     $ 1.49       2.90     $ 44,818  
                                 
Exercisable at December 31, 2017     13,720,742     $ 1.49       2.90     $ 44,818