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Common stock warrants (Tables)
6 Months Ended
Jun. 30, 2021
Common Stock Warrants  
Schedule of common stock warrants

The following table summarizes Series B and Series D common stock warrants as of each period:

 

   Series B   Series D   B and D Total 
Outstanding at December 31, 2019   87,456    6,252,954    6,340,410 
Issued   -    -    - 
Exercised   -    -    - 
Outstanding at December 31, 2020   87,456    6,252,954    6,340,410 
Issued   -    -    - 
Exercised   -    -    - 
Outstanding at June 30, 2021   87,456    6,252,954    6,340,410 

 

Series E, F, G, and H warrants were issued for investment banking and advisory services during 2009. Series E, F, and G warrants were exercised in 2014. The following table summarizes Series H ($7) warrants as of each period:

 

  

Series H

$7.00

exercise price

 
Outstanding at December 31, 2019   689,159 
Issued   - 
Exercised   - 
Outstanding at December 31, 2020   689,159 
Issued   - 
Exercised   - 
Outstanding at June 30, 2021   689,159