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Stockholders' Equity (Tables)
6 Months Ended
Jun. 30, 2023
Stockholders' Equity  
Schedule of common stock warrants outstanding

    

Common Stock 

Warrants

Outstanding, December 31, 2022

 

747,383

Expired

 

(434,025)

Outstanding, June 30, 2023

 

313,358

Schedule of stock option valuation assumptions

    

2023

2022

Dividend yield

 

%  

%

Expected volatility

 

101.92

%  

102.57

%

Risk-free interest rate

 

2.47

%  

2.39

%

Expected lives (years)

 

5.6

years

6.1

years

Schedule of stock option activity

    

    

Weighted

 

 

Weighted

Average

 

Aggregate

 

Average

Exercise

 

Intrinsic

 

Remaining

Shares

Price

 

Value

 

Contractual Life

Stock options outstanding at December 31, 2022

7,036,874

$

3.67

$

16,842

Expired

 

(95,558)

8.75

Forfeited

 

(83,223)

4.25

Stock options outstanding at June 30, 2023

 

6,858,093

$

3.60

$

13,894

8.7

Years

Stock options exercisable at June 30, 2023

3,582,001

$

5.20

$

13,894

8.3

Years

Schedule of restricted stock activity

Weighted

Average

Shares

Fair Value

Restricted stock at December 31, 2022

34,001

$

3.22

Released

(34,001)

3.22

Restricted stock at June 30, 2023

$

Schedule of RSU activity

Weighted

Average

Shares

Fair Value

RSUs at December 31, 2022

$

Granted

 

360,000

 

1.18

Vested

 

(50,000)

 

1.18

RSUs at June 30, 2023

 

310,000

$

1.18