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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2024
Summary of Assumptions Used in Black-Scholes Option Pricing Model

Year Ended December 31, 

    

2024

    

2023

    

2022

 

Risk-free interest rate

 

4.12% - 4.34

%  

3.38% - 4.65

%  

1.70% - 4.21

%

Expected volatility

 

89.6% - 89.8

%  

76.3% - 81.3

%  

77.7% - 81.9

%

Expected dividend yield

 

0

%  

0

%  

0

%

Expected life of employee and Board options (in years)

 

6.25

 

6.25

 

6.25

Summary of Stock Option Activity

Weighted

Aggregate

Number of

Average Exercise

Intrinsic

    

Shares

    

 Price

    

Value

Outstanding, December 31, 2023

 

658,138

$

155.88

 

  

Granted

 

253,760

 

10.32

 

  

Exercised

 

 

 

  

Forfeited

 

(275,941)

 

60.96

 

  

Expired

 

(295,497)

 

176.43

 

  

Outstanding, December 31, 2024

 

340,460

$

106.62

$

Weighted average remaining contractual life as of December 31, 2024 (in years)

 

7.32

 

  

 

  

Options exercisable, December 31, 2024

 

185,602

$

151.42

$

Weighted average remaining contractual life as of December 31, 2024 (in years)

 

6.08

 

  

 

  

Options vested and expected to vest as of December 31, 2024

 

340,460

$

106.62

$

Weighted average remaining contractual life as of December 31, 2024 (in years)

 

7.32

 

  

 

  

Employees And Non-Employee Members Of Board Of Directors  
Summary of Restricted Stock Unit Activity

Weighted

Number of

Average Grant

    

Units

    

Date Fair Value

Outstanding, December 31, 2023

 

47,194

$

111.24

Awarded

 

75,323

 

7.92

Vested and released

 

(31,170)

 

96.24

Forfeited

 

(11,434)

 

126.84

Outstanding, December 31, 2024

 

79,913

$

17.51

Restricted stock units exercisable (vested and deferred), December 31, 2024

 

Employee Stock Option  
Summary of Compensation Expense Recognized

Year Ended December 31, 

    

2024

    

2023

    

2022

Research and development

$

1,016

$

5,973

$

7,222

General and administrative

 

5,274

 

5,634

 

6,426

Total stock option expense

$

6,290

$

11,607

$

13,648

Restricted Stock Units  
Summary of Compensation Expense Recognized

Year Ended December 31, 

    

2024

    

2023

    

2022

Research and development

$

248

$

476

$

765

General and administrative

2,391

1,647

3,321

Total restricted stock unit expense

$

2,639

$

2,123

$

4,086