v3.25.2
Note 8 - Stock-based Compensation (Tables)
6 Months Ended
Jun. 30, 2025
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
   

Three Months Ended June 30,

   

Six Months Ended June 30,

 
   

2025

   

2024

   

2025

   

2024

 
   

(000’s)

   

(000’s)

 

Research and development

  $ 857     $ 458     $ 1,664     $ 1,382  

General and administrative

    1,934       1,663       3,641       2,742  

Total

  $ 2,791     $ 2,121     $ 5,305     $ 4,124  
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
           

Weighted

   

Weighted

         
   

Number of

   

Average

   

Average

   

Aggregate

 
   

Unvested

   

Exercise

   

Remaining

   

Intrinsic

 
   

Options

   

Price

   

Contractual

   

Value

 
   

(000's)

   

Per Share

   

Term (in years)

   

($000's)

 

Outstanding at December 31, 2024

    14,062     $ 2.83       6.23     $ 579  

Granted

    4,482     $ 3.61       9.61       2  

Exercised

        $              

Forfeited/canceled

        $              

Outstanding at June 30, 2025

    18,544     $ 3.02       6.67     $ 7,064  

Vested at June 30, 2025

    8,336     $ 3.46       5.22     $ 2,125  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
   

Six Months Ended June 30,

 
   

2025

   

2024

 

Expected term (in years)

    6.0       6.0  

Risk-free rate

    4.28 %     4.04 %

Expected volatility

    86 %     80 %

Expected dividend yield

           
Schedule of Nonvested Restricted Stock Units Activity [Table Text Block]
   

Shares
(000's)

   

Weighted
Average Price
Per Share

   

Weighted
Average Fair Value ($000's)

 

Unvested, December 31, 2024

    3,766     $ 2.41     $ 9,076  

Granted

                 

Vested

    (823 )     2.48       (2,042 )

Forfeited or canceled

                 

Unvested, June 30, 2025

    2,943     $ 2.39     $ 7,034