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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 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, 2022

 

3,756,835

$

8.28

 

$

36,616

Granted

 

1,086,876

 

14.06

 

  

Cancelled / Forfeited

 

(264,160)

 

10.42

 

  

Exercised

 

(115,455)

 

4.50

 

  

Balance as of September 30, 2023

 

4,464,096

$

9.66

$

37,331

Options exercisable as of September 30, 2023

 

2,311,211

$

7.05

$

25,374

Recognized Stock-Based Compensation Expense

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

Three Months Ended

Nine months ended

    

September 30, 

    

September 30, 

(in thousands)

2023

2022

2023

2022

Stock options

$

1,419

$

866

$

4,403

$

2,657

Employee Stock Purchase Plan

113

63

310

165

Total stock-based compensation expense

$

1,532

$

929

$

4,713

$

2,822

Selling, general & administrative

$

1,290

$

785

$

3,728

$

2,402

Research & development

221

 

132

927

 

367

Cost of goods sold

21

 

12

58

 

53

$

1,532

$

929

$

4,713

$

2,822

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 nine months ended September 30, 2023 and 2022:

    

September 30, 

2023

 

2022

Weighted average fair value per ESPP purchase right

 

$

9.01

$

2.85

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

%

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 nine months ended September 30, 2023 and 2022:

    

September 30, 

2023

 

2022

 

Weighted average fair value of options granted

 

$

10.59

$

4.56

Expected term (in years) — non-officer employees

 

5.5 to 6.1

5.5 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 58.6

%

Expected dividend yield

 

%

%

Risk-free interest rate

 

3.40% to 4.61

%

1.75% to 3.97

%