v3.23.1
Note 9 - Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2023
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

March 31, 2023

  

March 31, 2022

 

Research and development

 $93  $174 

Selling, general and administrative

  457   464 

Discontinued operations

  19   145 

Total

 $569  $783 
Share-Based Payment Arrangement, Restricted Stock and Restricted Stock Unit, Activity [Table Text Block]
      

Weighted

 
  

Number of

  

Average

 
  

Restricted

  

Grant Date

 
  

Stock Units

  

Fair Value

 

Restricted stock units outstanding, January 1, 2023

  82,778  $16.97 

Granted

  44,091   1.76 

Vested

  (34,606)  21.61 

Forfeited

  (643)  17.91 

Restricted stock units outstanding, March 31, 2023

  91,620  $7.89 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Number
of Stock Options
Outstanding

  

Weighted-
Average
Exercise
Price

  

Weighted-
Average
Remaining
Contractual
Life (Years)

  

Aggregate
Intrinsic
Value

 
              

(in thousands)

 

January 1, 2023

  725,623  $52.98         

Granted

  264,520   1.76         

Forfeited

  (1,950)  19.41         

Expired

  (90,802)  83.75         

Exercised

              

March 31, 2023

  897,391  $34.84   6.9  $ 

Vested and exercisable options— March 31, 2023

  459,397  $58.42   4.7  $ 

Vested and expected to vest— March 31, 2023

  897,391  $34.84   6.9  $ 
Performance Shares [Member]  
Notes Tables  
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Three months ended

March 31, 2023

 

Expected term (in years)

  6.3 

Risk-free interest rate

  3.9% 

Expected volatility

  94% 

Expected dividend rate

  0%