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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Stock-Based Compensation  
Schedule of Stock option plans

2009

2014

    

Plan

    

Plan

    

Total

Outstanding or Exercised as of December 31, 2020

 

85,498

 

2,547,677

 

2,633,175

Available for future issuance under plan

 

 

6,583,033

 

6,583,033

Total authorized by plan

 

85,498

 

9,130,710

 

9,216,208

Outstanding or Exercised as of December 31, 2021

 

 

11,184,450

 

11,184,450

Available for future issuance under plan

 

 

1,550,004

 

1,550,004

Totals authorized by plan

 

 

12,734,454

 

12,734,454

Outstanding or Exercised as of December 31, 2022

 

 

11,168,061

 

11,168,061

Available for future issuance under plan

 

 

1,495,760

 

1,495,760

Totals authorized by plan

 

 

12,663,821

 

12,663,821

Schedule of Summary of Stock Option Activity

Weighted

Average

Number of

Average

Remaining Life

    

Options

    

Exercise Price

    

(years)

Outstanding at December 31, 2019

 

1,383,591

$

4.77

 

6.25

Granted

 

1,481,000

 

1.66

 

  

Exercised

 

(82,083)

 

4.67

 

  

Expired or Forfeited

 

(149,333)

 

3.68

 

  

Outstanding at December 31, 2020

 

2,633,175

$

3.09

 

6.53

Granted

 

1,100,500

 

17.23

 

  

Exercised

 

(739,956)

 

3.36

 

  

Expired or Forfeited

 

(170,085)

 

8.58

 

  

Outstanding at December 31, 2021

 

2,823,634

$

7.67

 

7.95

Granted

 

442,000

 

5.45

 

  

Exercised

 

(145,185)

 

2.56

 

  

Expired or Forfeited

 

(314,776)

 

9.27

 

  

Outstanding at December 31, 2022

 

2,805,673

$

7.80

 

7.28

Summary of assumptions used to compute the fair value of stock options granted

December 31, 

    

2022

    

2021

    

2020

 

Assumptions for Black-Scholes:

 

  

 

  

 

  

Expected term in years

 

6.1

 

6.1 to 6.5

 

6.2 to 6.6

Volatility

 

85.44% to 87.09

%

82.8% to 86.0

%  

73.3% to 76.8

%

Risk-free interest rate

 

2.18% to 3.95

%

0.96% to 1.25

%  

0.41% to 0.55

%

Expected annual dividends

 

None

 

None

 

None

Value of options granted:

 

  

 

  

 

  

Number of options granted

 

442,000

 

1,100,500

 

1,481,000

Weighted average fair value per share

 

$

4.04

 

$

12.40

 

$

1.08

Fair value of options granted

 

$

1,783,710

 

$

13,642,976

 

$

1,602,267