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Note 8 - Share-based Compensation
 6 Months Ended
Jun. 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 six months ended June 30, 2024 and 2023 was recorded as follows (in thousands):

 

   

Three months ended

   

Six months ended

 
   

June 30,

    

June 30,

  
   

2024

    

2023

    

2024

    

2023

  

Research and development

   $ 102     $ 134     $ 217     $ 273  

Selling, general and administrative

     82       183       171       322  

Total share-based compensation

   $ 184     $ 317     $ 388     $ 595  

 

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

     (6,965 )     57.37                  

Balance, June 30, 2024

     155,642     $ 52.85       6.7     $ —  

Exercisable, June 30, 2024

     106,464     $ 65.79       5.9     $ —  

 

Unrecognized share-based compensation for employee and nonemployee options granted through June 30, 2024 is approximately $1.0 million to be recognized over a remaining weighted average service period of 2.0 years.

 

Share-Based Compensation (RSUs)

 

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