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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2025
Share-Based Payment Arrangement [Abstract]  
Schedule of Stock-Based Compensation Expense

Stock-based compensation has been recognized in operating results as follows:

 

(in thousands)

 

Years ended December 31,

 

 

2025

 

 

2024

 

Research and development expenses

 

$

2,376

 

 

$

1,660

 

Selling, general and administrative expenses

 

 

3,317

 

 

 

3,100

 

Total stock-based compensation

 

$

5,693

 

 

$

4,760

 

 

Schedule of Assumptions to Estimate Fair Value of Stock Option Awards

The estimated fair value of stock option awards was determined on the date of grant using the Black-Scholes option valuation model with the following assumptions during the years indicated below:

 

 

Years ended December 31,

 

2025

 

2024

Risk-free interest rate (range)

 

3.89% - 4.11%

 

4.04% - 4.27%

Dividend yield

 

0%

 

0%

Expected volatility (range)

 

104% - 106%

 

103% - 107%

Expected term (in years)

 

6.2

 

5.8

Summary of Stock Option Activity

A summary of stock option activity and of changes in stock options outstanding is presented below:

 

 

Number of
Options

 

 

Weighted-
Average
Exercise Price
Per Share

 

 

Intrinsic
Value

 

 

Weighted-
Average
Remaining
Contractual
Life

Balance outstanding, December 31, 2024

 

 

8,334,765

 

 

$

3.88

 

 

$

11,668,989

 

 

7.5 years

Granted

 

 

3,368,632

 

 

$

3.59

 

 

 

 

 

 

Exercised

 

 

(283,065

)

 

$

1.74

 

 

$

158,343

 

 

 

Forfeited

 

 

(589,583

)

 

$

2.97

 

 

 

 

 

 

Expired

 

 

(73,456

)

 

$

8.29

 

 

 

 

 

 

Balance Outstanding, December 31, 2025

 

 

10,757,293

 

 

$

3.87

 

 

$

2,678,115

 

 

7.1 years

Vested and exercisable, December 31, 2025

 

 

6,272,094

 

 

$

4.22

 

 

$

2,143,080

 

 

5.9 years

Vested and expected to vest, December 31, 2025

 

 

10,542,439

 

 

$

3.88

 

 

$

2,641,323

 

 

7.1 years