v3.26.1
Stock-Based Compensation (Tables)
6 Months Ended
Jun. 30, 2026
Stock-Based Compensation [Abstract]  
Components of Stock-Based Compensation Expense
Following is the stock-based compensation expense related to common stock options, restricted common stock, common stock warrants and deferred stock units:
 
                            
   
Three Months Ended
June 30,
   
Six Months Ended
June 30,
 
    2026 
 2025     2026     2025  
  in thousands  
Research and development
 $ 624   $ 254    $ 1,115    $ 530  
General and administrative
   339     246      623      436  
Total stock-based compensation expense
 $ 963   $ 500    $ 1,738    $ 966  
Stock Option Activity
The following table summarizes the stock option activity in the Company’s equity incentive plans, including non-plan grants to Company executives, from December 31, 2025 through June 30, 2026:
 
         
     Shares       Weighted
Average
Exercise
Price
 
 
Outstanding, December 31, 2025
   6,572,509    $ 2.27  
Granted
   1,020,000      3.05  
Exercised
   (347,245    1.61  
Options forfeited/cancelled
   (211,583    2.72  
Outstanding, June 30, 2026
   7,033,681    $ 2.40  
Weighted Average Assumptions Used to Determine Fair Value of Options Granted
The fair value of all other options granted is determined using the Black-Scholes option-pricing model. The following weighted average assumptions were used:
 
         
     Three
Months
Ended
June 30,
     Three
Months
Ended
June 30,
 
     2026      2025  
Risk-free interest rate
   3.84 %    4.48 %
Expected life of the options
   5.6 years      5.6 years  
Expected volatility of the underlying stock
   88 %    83 %
Expected dividend rate
   0 %    0 %