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Stock-based Compensation Expense (Tables)
12 Months Ended
Dec. 31, 2024
Summary of Stock Option Activity The following table summarizes the Company’s stock option activity during the year ended December 31, 2024:

 

 

 

Number of
Shares

 

 

Weighted
Average
Exercise Price

 

 

Weighted
Average
Remaining
Contractual
Term
(in years)

 

 

Aggregate
Intrinsic
Value

 

Outstanding at December 31, 2023

 

 

9,972,217

 

 

$

8.44

 

 

 

8.49

 

 

$

15,114,074

 

Granted

 

 

4,226,008

 

 

 

7.70

 

 

 

 

 

 

 

Exercised

 

 

(427,757

)

 

 

5.62

 

 

 

 

 

 

 

Cancelled

 

 

(4,415,769

)

 

 

10.08

 

 

 

 

 

 

 

Outstanding at December 31, 2024

 

 

9,354,699

 

 

$

7.46

 

 

 

8.03

 

 

$

5,353,463

 

Exercisable at December 31, 2024

 

 

4,349,742

 

 

$

9.06

 

 

 

7.35

 

 

$

2,045,339

 

Weighted Average Assumptions Used to Calculate Fair Value of Stock Option

The fair value of stock options granted during the years ended December 31, 2024 and 2023 has been calculated on the date of grant using the following weighted average assumptions:

 

 

 

Year
Ended
December 31, 2024

 

 

Year
Ended
December 31, 2023

 

Risk-free interest rate

 

 

4.1

%

 

 

3.7

%

Expected dividend yield

 

 

0.0

%

 

 

0.0

%

Expected term (years)

 

 

6.0

 

 

 

6.1

 

Expected stock price volatility

 

 

103.3

%

 

 

98.6

%

Summary of Stock-Based Compensation Expense Recognized

The total compensation cost recognized in the statements of operations and comprehensive loss associated with all stock-based compensation awards granted by the Company is as follows (in thousands):

 

 

 

Year Ended
December 31,

 

 

 

2024

 

 

2023

 

General and administrative

 

$

9,901

 

 

$

11,026

 

Research and development

 

 

4,653

 

 

 

3,776

 

Total stock-based compensation expense

 

$

14,554

 

 

$

14,802

 

Grants Outside of 2016 Stock Incentive Plan and 2019 Stock Incentive Plan  
Summary of Restricted Stock Activity

The following table summarizes the Company’s restricted stock unit activity during the year ended December 31, 2024:

 

 

 

Number of
Shares

 

 

Weighted
Average Grant
Date Fair
Value

 

Unvested at December 31, 2023

 

 

75,017

 

 

$

10.77

 

Granted

 

 

70,445

 

 

 

6.95

 

Vested

 

 

(22,326

)

 

 

10.65

 

Cancelled

 

 

(80,064

)

 

 

8.26

 

Unvested at December 31, 2024

 

 

43,072

 

 

$

9.25