v3.25.2
Note 11 - Benefit Plans (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

(in thousands)

 

2025

  

2024

  

2025

  

2024

 

General and administrative

 $767  $1,048  $1,768  $2,184 

Research and development

  600   903   1,546   1,780 

Total stock-based compensation expense

 $1,367  $1,951  $3,314  $3,964 
  

Three Months Ended June 30,

  

Six Months Ended June 30,

 

(in thousands)

 

2025

  

2024

  

2025

  

2024

 

Stock options

 $1,496  $1,951  $3,443  $3,953 

Stock awards

  (129)     (129)  11 

Total stock-based compensation expense

 $1,367  $1,951  $3,314  $3,964 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]

(in thousands, except share, per share, and term data)

 

Number of Options

  Weighted Average Exercise Price Per Share  Weighted Average Remaining Term (Years)  

Intrinsic Value

 

Outstanding – December 31, 2024

  1,944,252  $27.90   8.24  $59 

Granted

  384,429   3.93   9.70    

Forfeited

  (11,902)  31.79       

Expired

  (3,984)  10.60       

Outstanding – June 30, 2025

  2,312,795  $23.93   8.09  $98 

Vested and exercisable – June 30, 2025

  1,154,866  $38.21   7.29  $82 

Vested, exercisable or expected to vest – June 30, 2025

  2,312,795  $23.93   8.09  $98 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Six Months Ended June 30,

 
  

2025

  

2024

 

Expected stock price volatility

  103.78% – 110.25%  97.78% – 110.82%

Risk-free interest rate

  4.05% – 4.24%  4.04% – 4.58%

Expected dividend yield

  0.00%  0.00%

Expected term of options (in years)

  5.00 – 6.25   5.00 – 10.00 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
  

Number of Stock Awards

  

Weighted Average Grant Date Fair Value

 

Unvested balance – December 31, 2024

  37,441  $196.84 

Forfeited

  (663)  196.84 

Unvested balance – June 30, 2025

  36,778  $196.84