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

The following is a summary of stock option activity:

    

    

Weighted 

    

Number 

Average 

Aggregate 

of 

Exercise 

Intrinsic 

Options

Price

Value

 

(in  thousands)

Balance as of December 31, 2020

1,473,359

$

2.77

$

3,745

Granted

1,411,717

$

13.31

Cancelled / Forfeited

(76,294)

$

11.25

Exercised

(59,341)

$

0.39

Balance as of December 31, 2021

 

2,749,441

$

7.93

 

$

16,262

Granted

 

1,486,805

$

8.14

 

  

Cancelled / Forfeited

 

(328,902)

$

7.96

 

  

Exercised

 

(150,509)

$

1.22

 

  

Balance as of December 31, 2022

 

3,756,835

$

8.28

$

36,616

Options exercisable as of December 31, 2022

 

1,639,936

$

6.22

$

19,360

Recognized Stock-Based Compensation Expense

The following table presents the components and classification of stock-based compensation expense for the periods indicated:

    

Year Ended December 31, 

(in thousands)

2022

2021

Stock options

$

3,664

$

1,912

Employee Stock Purchase Plan

223

Total stock-based compensation expense

3,887

1,912

Selling, general & administrative

$

3,304

$

1,468

Research & development

519

 

420

Cost of goods sold

64

 

24

$

3,887

$

1,912

ESPP  
Schedule of Assumptions Used to Determine the Grant-Date Fair Value of Stock Options

The following table provides the weighted average fair value of ESPP purchase rights and the related assumptions used in the Black-Scholes option pricing model for the year ended December 31, 2022.

    

December 31, 

2022

 

Weighted average fair value per ESPP purchase right

 

$

1.95

Expected term (in years) 

 

0.5

Expected volatility

 

51.3% to 62.9

%

Expected dividend yield

 

%

Risk-free interest rate

 

0.22% to 2.52

%

Stock options  
Schedule of Assumptions Used to Determine the Grant-Date Fair Value of Stock Options

The following table provides the weighted average fair value of options granted to employees and the related assumptions used in the Black-Scholes option pricing model for the years ended December 31, 2022 and 2021.

    

December 31, 

2022

 

2021

Weighted average fair value of options granted

 

$

4.72

$

5.64

Expected term (in years) — non-officer employees

 

5.3 to 6.1

2.7 to 6.1

Expected term (in years) — officer employees

 

3.2 to 6.1

3.0

Expected volatility

 

56.3% to 60.4

%

56.1% to 63.4

%

Expected dividend yield

 

%

%

Risk-free interest rate

 

1.75% to 4.18

%

0.17% to 1.44

%