v3.26.1
Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2026
Share-Based Payment Arrangement [Abstract]  
Summary of Stock Option Activity and Related Information

A summary of stock option activity and related information as of June 30, 2026 is as follows:

 

 

Number of
Option Shares

 

 

Weighted Average
Exercise Price

 

 

 Outstanding at December 31, 2025

 

 

8,002,394

 

 

$

4.69

 

 

 Granted

 

 

1,233,500

 

 

 

1.57

 

 

 Exercised

 

 

 

 

 

 

 

 Forfeited

 

 

(150,000

)

 

 

2.10

 

 

 Expired

 

 

(763,000

)

 

 

3.91

 

 

 Outstanding at June 30, 2026

 

 

8,322,894

 

 

$

4.35

 

 

 Exercisable at June 30, 2026

 

 

7,094,394

 

 

$

4.84

 

 

Summary of Stock-based Compensation Expense The following table summarizes stock-based compensation expense for the three and six months ended June 30, 2026 and 2025, respectively:

 

 

 

Three months ended

 

 

Six months ended

 

 

 

June 30,

 

 

June 30,

 

 

 

2026

 

 

2025

 

 

2026

 

 

2025

 

Research, development and patents

 

$

60,841

 

 

$

72,082

 

 

$

215,389

 

 

$

196,273

 

General and administrative

 

 

115,926

 

 

 

132,815

 

 

 

369,139

 

 

 

294,567

 

Total stock-based compensation expense

 

$

176,767

 

 

$

204,897

 

 

$

584,528

 

 

$

490,840

 

Schedule of Assumptions Used in Estimating Fair Value of Options Granted and Performance-Based Stock Options The following table provides the assumptions used in the Black-Scholes valuation model used to estimate the fair value of options granted during the six months ended June 30, 2026 and 2025, and to estimate the fair value of performance-based stock options as of June 30, 2026 and 2025.

 

 

Six months ended June 30,

 

 

2026

 

2025

Stock Options

 

 

 

 

Risk-free interest rate

 

3.87 - 4.29%

 

3.79 - 4.48%

Expected volatility of common stock

 

57.89 - 69.31%

 

69.75 - 75.66%

Dividend yield

 

0.00%

 

0.00%

Expected term (in years)

 

5.05 - 5.54

 

4.53 - 5.31