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

The following table summarizes information about warrants outstanding at June 30, 2019 and December 31, 2018:

 

   Shares of Common Stock Issuable
from Warrants Outstanding as of
  Weighted   
   June 30,  December 31,  Average   
Description  2019  2018  Exercise Price  Expiration
Series A   240,000    240,000   $0.35    July 12, 2019 
Series D   810,000    810,000   $1.10    June 5, 2020 
Series E   584,416    584,416   $1.54    September 8, 2021 
Series F   7,246    7,246   $3.45    February 23, 2022 & March 9, 2022 
Series G   460,250    460,250   $2.68    July 21, 2022 
Series H   910,000    910,000   $2.75    October 16, 2022 
Series I   10,335,000    10,335,000   $2.00    November 26, 2025 
Total   13,346,912    13,346,912