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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