v3.26.3
Note 11 - Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2026
Notes Tables  
Share-Based Payment Arrangement, Cost by Plan [Table Text Block]
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 

(in thousands)

 

2026

  

2025

  

2026(1)

  

2025

 

General and administrative

 $555  $949  $1,667  $2,717 

Research and development

  524   754   1,764   2,300 

Total stock-based compensation expense

 $1,079  $1,703  $3,431  $5,017 
  

Three Months Ended September 30,

  

Nine Months Ended September 30,

 

(in thousands)

 

2026

  

2025

  

2026(1)

  

2025

 

Stock options

 $1,079  $1,703  $3,431  $5,146 

Stock awards(2)

  —   —   —   (129)

Total stock-based compensation expense

 $1,079  $1,703  $3,431  $5,017 
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, 2025

  2,787,201  $20.79   8.11  $1,013 

Granted

  707,572   5.44   9.52   — 

Forfeited

  (16,568)  7.45   —   — 

Expired

  (4,066)  27.64   —   — 

Outstanding – September 30, 2026

  3,474,139  $17.72   7.76  $128 

Vested and exercisable – September 30, 2026

  2,397,055  $22.58   7.49  $128 

Vested, exercisable or expected to vest – September 30, 2026

  3,474,139  $17.72   7.76  $128 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Nine Months Ended September 30,

 
  

2026

  

2025

 

Expected stock price volatility

  96.64% – 107.55%  96.77% – 110.25%

Risk-free interest rate

  3.65% – 4.32%  3.67% – 4.24%

Expected dividend yield

  0.00%  0.00%

Expected term of options (in years)

  5.00 – 6.09   5.00 – 6.25