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Warrants (Tables)
12 Months Ended
Dec. 31, 2022
Warrants  
Summary of Common Stock Warrants Outstanding

The following common stock warrants were outstanding at December 31, 2022:

Number of

Common

Per Share

Stock

Exercise

Warrants

Price

Issuance Date

Expiration Date

Issued with common units in the 2018 Unit Offering

 

3,300

 

2.7568

 

October 2, 2018

 

October 2, 2023

Issued with common units in the 2018 Registered Direct Offering

 

92,300

 

5.40

 

October 10, 2018

 

October 10, 2023

Issued with common units in the 2019 Registered Direct Offering

 

50,000

 

3.21

 

March 12, 2019

 

March 12, 2024

Issued with common units in the 2020 Public Offering (see Note 10)

 

869,566

 

0.0001

 

July 16, 2020

 

Total

 

1,015,166

 

  

 

  

 

  

 

  

 

  

 

  

 

  

The following common stock warrants were outstanding at December 31, 2021:

Number of

Common

Per Share

Stock

Exercise

Warrants

Price

Issuance Date

Expiration Date

Replacement warrants

    

155

    

$

483.00

    

March 3, 2012

    

March 3, 2022

Issued with common units in the 2018 Unit Offering

 

3,300

 

2.7568

 

October 2, 2018

 

October 2, 2023

Issued with common units in the 2018 Registered Direct Offering

 

92,300

 

5.40

 

October 10, 2018

 

October 10, 2023

Issued with common units in the 2019 Registered Direct Offering

 

50,000

 

3.21

 

March 12, 2019

 

March 12, 2024

Issued with common units in the 2020 Public Offering (see Note 10)

1,630,436

 

0.0001

 

July 16, 2020

 

Issued in exchange for retirement of common stock per the Exchange Agreement (see Note 10)

 

1,000,000

 

0.0001

 

February 25, 2021

 

Total

 

2,776,191

 

  

 

  

 

  

Summary of Warrant Activity

A summary of warrant activity is as follows:

Weighted-Average

    

    

Weighted

Remaining

Number of

Average

Contractual Term

Warrants

Exercise Price

(Years)

Warrants outstanding, December 31, 2021

 

2,776,191

 

Expired

(155)

Exercises (see Note 10)

 

(1,760,870)

 

Warrants outstanding, December 31, 2022

 

1,015,166

 

$

0.66

0.9