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Stock-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2022
Stock-Based Compensation [Abstract]  
Schedule of restricted stock unit activity
   Restricted
Stock Units
   Weighted
Average Grant
Date Fair Value
 
Non-vested 12/31/2021   96,201   $28.87 
Granted   178,425    6.08 
Forfeited   (26,400)   11.01 
Vested   (51,388)   21.67 
Non-vested 12/31/2022   196,838   $12.49 

 

Schedule of the fair value of stock options granted
   For the Years Ended
December 31,
 
   2022   2021 
Exercise price  $ 2.77 - $ 6.90   $ 6.56 - $ 19.82 
Dividend yield   0.00%   0.00%
Expected volatility   92.00% - 99.00%   89.00% - 98.00%
Risk-free interest rate   1.46% - 4.23%   0.45% - 1.33%
Expected life (in years)   5.27 - 6.08    5.27 - 6.08 

 

Schedule of stock option activities
   Number of
Options
   Weighted
Average
Exercise
Price
   Weighted
Average
Remaining
Contractual
Term (years)
   Aggregate
Intrinsic
Value (1)
 
Outstanding 12/31/2021   1,356,639   $20.51    8.59   $1 
Granted   844,400    6.13    
-
    
-
 
Exercised   
-
    
-
    
-
    
-
 
Forfeited   (246,977)   15.35    
-
    
        -
 
Expired   (125,733)   25.40    
-
    
-
 
Outstanding at December 31, 2022   1,828,329   $14.23    8.16   $
-
 
                     
Vested or expected to vest at December 31, 2022   1,828,329   $14.23    8.16   $
-
 
Exercisable as of December, 31 2022   755,234   $18.71    7.50   $
-
 

 

(1)Aggregate intrinsic value represents the difference between the exercise price of the option and the closing market price of our common stock on December 31, 2022. The intrinsic value of options exercised during the years ended December 31, 2022 and 2021 was $0 as no options were exercised.

 

Schedule of total stock-based compensation costs
   For the Years Ended
December 31,
 
   2022   2021 
RSUs  $1,272   $4,520 
Stock options   5,416    5,842 
Total  $6,688   $10,362 

 

Schedule of stock-based compensation expense
   For the Years Ended
December 31,
 
   2022   2021 
Research and development  $1,511   $1,409 
General and administrative   5,177    8,953 
Total  $6,688   $10,362