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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2021
Stockholders' Equity  
Summary of Series X preferred stock or warrants to purchase

The following table presents information about warrants that are issued and outstanding at September 30, 2021:  

Year Issued

    

Equity Instrument

    

Warrants Outstanding

    

Exercise Price

    

Date of Expiration

2015

 

Common Stock

204

$

732.72

 

3/30/2022

2018

 

Common Stock

699,962

$

72.00

 

6/21/2023

2019

 

Common Stock

331,858

$

37.50

 

2/7/2024

2021

Common Stock

498,356

$

2.10

12/14/2030

Total

 

1,530,380

 

 

Weighted average exercise price

$

41.84

 

Weighted average life in years

 

  

 

4.30