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Note 8 - Share-based Compensation
 9 Months Ended
Sep. 30, 2024
Notes to Financial Statements  
Share-Based Payment Arrangement [Text Block]

(8)

Share-Based Compensation

 

The share-based compensation expense is recorded in research and development, and selling, general and administrative expenses based on the employee's or non-employee’s respective function. No share-based compensation was capitalized during the periods presented. Share-based compensation expense for the three and nine months ended September 30, 2024 and 2023 was recorded as follows (in thousands):

 

   

Three months ended

   

Nine months ended

 
   

September 30,

    

September 30,

  
   

2024

    

2023

    

2024

    

2023

  

Research and development

   $ 98     $ 118     $ 315     $ 391  

Selling, general and administrative

     79       133       250       455  

Total share-based compensation

   $ 177     $ 251     $ 565     $ 846  

 

The following table summarizes the activity of stock options and related information:

 

   

Number of

shares

    

Weighted

average exercise

price

    

Weighted

average

remaining

contractual

term (years)

    

Aggregate intrinsic

value
(in thousands)

  
                                 

Balance, December 31, 2023

     165,784     $ 52.67       6.8     $ 43  

Stock options forfeited

     (3,177 )     33.97                  

Stock options expired

     (9,317 )     63.09                  

Balance, September 30, 2024

     153,290     $ 52.43       6.5     $ —  

Exercisable, September 30, 2024

     109,830     $ 63.83       5.8     $ —  

 

 

Unrecognized share-based compensation for employee and nonemployee options granted through September 30, 2024 is $837,000 to be recognized over a remaining weighted average service period of 1.8 years.

 

Share-Based Compensation (RSUs)

 

There were no RSUs outstanding and hence there is no unrecognized share-based compensation at September 30, 2024 and December 31, 2023.