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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2022
Stockholders' Equity  
Schedule of warrants outstanding and exercisable for purchase of common stock

Number of Shares

March 31, 

December 31,

Weighted-Average

Description

2022

2021

Exercise Price

Expiration Date

 

Equity-classified Warrants

May 2013 warrants

 

15,437

15,437

$ 0.08

None

September 2013 warrants

 

4,096

4,096

$ 0.08

None

February 2014 warrants

 

2,171

2,171

$ 0.08

None

April 2020 Private Placement first closing warrants

3,039,514

3,039,514

$ 2.28

Apr 2023

April 2020 Private Placement second closing warrants

1,373,626

1,373,626

$ 2.71

Dec 2023

April 2020 Private Placement second closing warrants

1,143,428

1,143,428

$ 0.01

None

July 2020 Private Placement first closing warrants

389,731

389,731

$ 0.01

None

July 2020 Private Placement first closing warrants

2,764,227

2,764,227

$ 2.58

Jul 2023

8,732,230

8,732,230

Total outstanding

 

8,732,230

8,732,230