XML 61 R30.htm IDEA: XBRL DOCUMENT v3.22.4
Note 9 - Stock-based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Notes Tables  
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]
  

Year Ended
December 31,

 
  

2022

  

2021

 
  

(000's)

 

Research and development

 $781  $658 

General and administrative

  4,549   3,371 

Total

 $5,330  $4,029 
Nonvested Restricted Stock Shares Activity [Table Text Block]
  

Shares (000's)

  

Estimated
Fair Value
Per Share

 

Unvested, December 31, 2020

  896  $2.46 

Granted

    $ 

Vested

  (359) $1.83 

Forfeited or canceled

  (66) $1.70 

Unvested, December 31, 2021

  471  $1.76 

Granted

    $ 

Vested

  (258) $1.77 

Forfeited or canceled

  (20) $1.77 

Unvested, December 31, 2022

  193  $1.74 
Share-Based Payment Arrangement, Option, Activity [Table Text Block]
  

Number of
Nonvested
Options (000's)

  

Weighted
Average
Exercise
Price
Per Share

  

Weighted
Average
Remaining
Contractual
Life (in years)

  

Aggregate

Intrinsic Value

(000's)

 

Outstanding at December 31, 2020

  2,159  $5.00   9.69  $ 

Granted

  1,822  $5.02   9.27  $ 

Exercised

    $     $ 

Forfeited/cancelled

  (322) $5.00     $ 

Outstanding at December 31, 2021

  3,659  $5.01   8.98  $ 

Granted

  2,277  $2.30   8.81  $ 

Exercised

  (6) $2.26     $6 

Forfeited/cancelled

  (552) $4.78     $118 

Outstanding at December 31, 2022

  5,378  $3.89   8.24  $6,316 

Vested at December 31, 2022

  2,710  $4.65   7.62  $1,216 
Schedule of Share-Based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]
  

Year Ended
December 31,

 
  

2022

  

2021

 

Expected term (in years)

  6.0   6.1 

Risk-free rate

  2.02%  0.85%

Expected volatility

  94%  91%
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, 2020

    $  $ 

Granted

  1,200   3.83   4,596 

Vested

         

Forfeited or canceled

         

Unvested, December 31, 2021

  1,200  $3.83  $4,596 

Granted

    $  $ 

Vested

  (300)  3.83   (1,149)

Forfeited or canceled

         

Unvested, December 31, 2022

  900  $3.83  $3,447