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Stock Based Compensation (Tables)
9 Months Ended
Sep. 30, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-based Compensation Expenses

Total stock‑based compensation expense recorded for employees, directors and non‑employees:

 

 

Three Months Ended

 

 

Nine Months Ended

 

 

September 30,

 

 

September 30,

 

(in thousands)

 

2024

 

 

2023

 

 

2024

 

 

2023

 

Research and development

 

$

951

 

 

$

764

 

 

$

2,907

 

 

$

2,378

 

General and administrative

 

 

1,140

 

 

 

1,072

 

 

 

3,453

 

 

 

3,356

 

Total stock-based compensation expense

 

$

2,091

 

 

$

1,836

 

 

$

6,360

 

 

$

5,734

 

Schedule of Options Outstanding

The following table summarizes the information about stock options outstanding at September 30, 2024:

 

 

 

 

 

 

 

 

Weighted-Average

 

 

 

 

 

 

 

 

Weighted-

 

 

Remaining

 

 

 

 

 

 

 

 

Average

 

 

Contractual

 

 

Aggregate

 

(in thousands, except for share data)

 

Options
Outstanding

 

 

Exercise
Price

 

 

Term (in
years)

 

 

Intrinsic
Value

 

Outstanding at December 31, 2023

 

 

4,695,619

 

 

$

2.01

 

 

 

5.9

 

 

$

7,875

 

Options granted

 

 

 

 

 

 

 

 

 

 

 

 

Options exercised

 

 

(327,492

)

 

 

1.05

 

 

 

 

 

 

 

Forfeited

 

 

(58,123

)

 

 

1.05

 

 

 

 

 

 

 

Expired

 

 

 

 

 

 

 

 

 

 

 

 

Outstanding at September 30, 2024

 

 

4,310,004

 

 

$

2.09

 

 

 

5.0

 

 

$

27,613

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Exercisable at September 30, 2024

 

 

4,168,686

 

 

$

2.13

 

 

 

5.0

 

 

$

26,561

 

Nonvested at September 30, 2024

 

 

141,318

 

 

$

1.05

 

 

 

7.2

 

 

$

1,052

 

Schedule of Restricted Stock Units Outstanding

The following table summarizes the information about restricted stock units outstanding at September 30, 2024:

 

 

 

 

 

Weighted-Average

 

 

 

 

 

Grant Date

 

(in thousands, except for share data)

 

Shares

 

 

Fair Value

 

Outstanding at December 31, 2023

 

 

6,917,422

 

 

$

2.35

 

Awarded

 

 

1,425,000

 

 

 

5.71

 

Released

 

 

(1,256,626

)

 

 

1.86

 

Forfeited

 

 

(633,984

)

 

 

2.92

 

Outstanding at September 30, 2024

 

 

6,451,812

 

 

$

3.35

 

Nonvested at September 30, 2024

 

 

6,205,093

 

 

$

3.38

 

 

 

 

 

 

 

 

Weighted Average Remaining Recognition Period (in years)

 

 

2.6