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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2023
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, 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

Granted

 

1,161,926

$

14.20

 

  

Cancelled / Forfeited

 

(285,729)

$

10.52

 

  

Exercised

 

(144,187)

$

5.05

 

  

Balance as of December 31, 2023

 

4,488,845

$

9.77

$

97,266

Options exercisable as of December 31, 2023

 

2,450,327

$

7.27

$

59,295

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)

2023

2022

Stock options

$

5,901

$

3,664

Employee Stock Purchase Plan

402

223

Total stock-based compensation expense

6,303

3,887

Selling, general & administrative

$

5,073

$

3,304

Research & development

1,152

 

519

Cost of goods sold

78

 

64

$

6,303

$

3,887

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 years ended December 31, 2023 and 2022.

    

December 31, 

2023

 

2022

Weighted average fair value per ESPP purchase right

 

$

5.64

$

1.95

Expected term (in years) 

 

0.5

0.5

Expected volatility

 

76.2% to 84.6

%

51.3% to 62.9

%

Expected dividend yield

 

%

%

Risk-free interest rate

 

4.77% to 5.53

%

0.22% to 2.52

%

Employee Stock Option  
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, 2023 and 2022.

    

December 31, 

2023

 

2022

Weighted average fair value of options granted

 

$

10.65

$

4.72

Expected term (in years) — non-officer employees

 

5.5 to 6.1

5.3 to 6.1

Expected term (in years) — officer employees

 

2.5 to 6.1

3.2 to 6.1

Expected volatility

 

77.2% to 79.6

%

56.3% to 60.4

%

Expected dividend yield

 

%

%

Risk-free interest rate

 

3.40% to 4.89

%

1.75% to 4.18

%