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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2025
Summary of Assumptions Used in Black-Scholes Option Pricing Model

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Three Months Ended

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March 31, 

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2025

    

2024

    

Risk-free interest rate

 

—

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4.12%

 

Expected volatility

 

—

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89.6%

 

Expected dividend yield

 

—

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0%

 

Expected life of employee and Board options (in years)

 

—

​

6.25

 

Summary of Stock Option Activity

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Weighted

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​

​

Number of

​

Average Exercise

​

​

    

Shares

    

 Price

    

Outstanding, December 31, 2024

 

113,487

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$

319.80

 

Granted

 

—

​

 

—

 

Exercised

 

—

​

 

—

 

Forfeited

 

—

​

 

—

 

Expired

 

—

​

 

—

 

Outstanding, March 31, 2025

 

113,487

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$

319.80

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Options exercisable, March 31, 2025

 

64,989

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​

​

​

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

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Weighted

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Number of

​

Average Grant

​

    

Units

    

Date Fair Value

Outstanding, December 31, 2024

 

26,638

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$

52.53

Awarded

 

—

​

 

—

Vested and released

 

(792)

​

 

447.95

Forfeited

 

—

​

 

—

Outstanding, March 31, 2025

 

25,846

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$

40.39

Restricted stock units exercisable (vested and deferred), March 31, 2025

 

—

​

​

​

Employee Stock Option  
Summary of Compensation Expense Recognized

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Three Months Ended

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​

March 31, 

​

​

    

2025

    

2024

    

Research and development

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$

—

​

$

504

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General and administrative

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1,100

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1,229

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Total stock option expense

​

$

1,100

​

$

1,733

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Restricted Stock Units  
Summary of Compensation Expense Recognized

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​

​

​

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​

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Three Months Ended

​

​

March 31, 

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2025

​

​

2024

Research and development

 

$

—

​

$

255

General and administrative

​

​

326

​

​

1,357

Total restricted stock unit expense

 

$

326

​

$

1,612