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Common Stock (Tables)
12 Months Ended
Dec. 31, 2021
Common Stock.  
Schedule of Classification of warrants to equity

Risk-free interest rate

    

0.82

%

Expected volatility

 

121.22

%

Expected term

 

5

years

Expected dividend yield

 

%

Exercise price

$

2.08

Market value of common stock

$

2.58

Risk-free interest rate

    

0.88

%

Expected volatility

 

107.00

%

Expected term

 

2

months

Expected dividend yield

 

%

Exercise price

$

3.70

Market value of common stock

$

3.11

Schedule of warrant to purchase common stock

    

    

Weighted-average

Amount

exercise price

Outstanding at December 31, 2020

 

1,893,201

$

6.44

Issued

 

686,232

 

2.08

Expired

 

(78,014)

 

35.20

Outstanding at December 31, 2021

 

2,501,419

$

4.35