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Stockholders' Equity (Tables)
12 Months Ended
Dec. 31, 2021
Stockholders' Equity  
Schedule of common stock warrants by exercise price range

Issuance Date

    

Number of Shares

    

Exercise Price

    

Expiration Date

5/7/2018

 

403,025

$

11.09

 

5/8/2023

11/26/2018

 

313,358

$

11.55

 

11/26/2023

1/28/2021

 

31,000

$

5.78

 

1/28/2023

Schedule of common stock warrants outstanding

    

Common Stock 

Warrants

Outstanding, December 31, 2019

 

1,290,103

Issued

 

1,428,571

Exercised

 

(1,489,497)

Exchanged

 

(470,238)

Outstanding, December 31, 2020

 

758,939

Issued

 

31,000

Expired

 

(42,556)

Outstanding, December 31, 2021

 

747,383

Schedule of components of stock-based compensation included in net loss

For the years ended 

December 31, 

    

2021

    

2020

Employee stock options

$

1,136,843

$

4,966,596

Non-employee stock options

 

1,294,279

 

158,963

Employee stock awards

 

2,903,463

 

1,072,506

Non-employee stock awards

 

834,396

 

179,792

$

6,168,981

$

6,377,857

Schedule of stock option valuation assumptions

    

2021

2020

Dividend yield

 

%  

%

Expected volatility

 

99.34-104.61

%  

83.13-101.68

%

Risk-free interest rate

 

0.36-1.36

%  

0.26-1.69

%

Expected lives (years)

 

5.0-6.1

years

5.4-6.3

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, 2019

437,603

$

17.90

$

44,196

Granted

1,167,749

7.90

Exercised

(7,140)

3.99

9,813

Cancelled and expired

(118,073)

5.80

Stock options outstanding at December 31, 2020

1,480,139

$

11.05

$

9,213

Granted

 

1,674,153

 

4.65

 

Exercised

 

(70,967)

 

6.53

Expired

 

(49,532)

 

14.26

 

Forfeited

 

(79,478)

 

5.55

 

Stock options outstanding at December 31, 2021

 

2,954,315

$

7.62

$

100,419

9.02

Years

Stock options exercisable at December 31, 2021

1,161,021

$

12.12

$

37,130

8.22

Years

Schedule of restricted stock activity

Weighted

Average

Shares

Fair Value

Restricted stock at December 31, 2019

179,505

$

5.99

Granted

339,999

3.22

Vested

(275,115)

4.27

Cancelled

(4,461)

7.42

Restricted stock at December 31, 2020

239,928

$

4.02

Granted

678,490

5.09

Vested

(548,248)

4.88

Restricted stock at December 31, 2021

370,170

$

4.71

Schedule of RSU activity

Weighted

Average

Shares

Fair Value

RSUs at December 31, 2019

4,291

$

30.29

Vested

(2,342)

33.15

Cancelled

(49)

36.57

RSUs at December 31, 2020

1,900

$

26.60

Vested

 

(1,900)

 

26.60

Cancelled

 

 

RSUs at December 31, 2021

 

$