v3.26.1
Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2026
Stock-Based Compensation  
Summary of stock option activity

Options Outstanding and Exercisable

Weighted

Weighted

Average

Aggregate

Average

Remaining

Intrinsic

Number of

Exercise

Contractual

Value(1)

  ​ ​ ​

Shares

  ​ ​ ​

Price

  ​ ​ ​

Life (Years)

  ​ ​ ​

(in thousands)

Outstanding as of December 31, 2025

 

848,966

$

73.76

 

6.5

$

Granted

174,500

$

9.92

Exercised

(2,488)

$

5.76

Forfeitures

(5,960)

$

21.90

Outstanding as of June 30, 2026

1,015,018

$

63.26

6.6

Exercisable as of June 30, 2026

 

709,995

$

85.67

 

5.6

$

(1)The aggregate intrinsic value is calculated as the difference between the exercise price of the underlying options and the estimated fair value of the common stock for the options that were in the money at December 31, 2025 and June 30, 2026.
Summary of stock based compensation expense recorded

Three Months Ended

Six Months Ended

June 30, 

June 30, 

(in thousands)

  ​ ​ ​

2026

  ​ ​ ​

2025

  ​ ​ ​

2026

  ​ ​ ​

2025

Research and development

$

112

$

285

$

236

$

865

General and administrative

 

192

 

302

 

412

 

1,086

Total stock-based compensation expense

$

304

$

587

$

648

$

1,951

Summary of assumptions used in the Black Scholes option pricing model for stock options granted

Six Months Ended

June 30, 

  ​ ​ ​

2026

  ​ ​ ​

2025

Expected term

 

6.0

years 

6.0

years 

Expected volatility

 

91.0

%

90.5

%

Risk free interest rate

 

3.9

%

4.4

%

Expected dividend yield

 

%

%