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Stock-based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of fair value of options granted
Expected volatility   90.7%
Expected dividend yield   
 
Expected term (in years)   5.0 
Risk-free interest rate   2.99%

 

Schedule of stock option activity
           Weighted     
       Weighted   Average     
       Average   Remaining     
       Exercise   Contractual   Aggregate 
   Number of   Price Per   Term   Intrinsic 
   Options   Share   (years)   Value (1) 
Outstanding at December 31, 2021   1,087,820   $4.08    3.9   $
 
Granted   1,634,195   $0.42    5.0   $
 
Exercised   
   $
    
   $
 
Forfeited   (103,287)  $
    
   $
 
Expired   
   $
    
   $
 
Outstanding at September 30, 2022   2,574,846   $1.85    2.7   $
 
Exercisable at September 30, 2022   1,015,854   $3.62    1.7   $
 

 

(1)The aggregate intrinsic value in the table was calculated based on the difference between the estimated fair market value of our stock and the exercise price of the underlying options. The estimated stock values used in the calculation were $0.98 and $0.3510 per share for the year ended December 31, 2021 and the nine months ended September 30, 2022, respectively.

 

Schedule of summarizes restricted stock unit activity
       Weighted 
       Average 
       Grant-Date 
       Fair 
   Number of   Value Per 
   Units   Unit 
Outstanding as of December 31, 2021   667   $1.80 
Granted   5,000   $0.76 
Vested   (5,667)  $0.76 
Forfeited   
   $
 
Outstanding as of September 30, 2022   
   $
 

 

Schedule of stock-based compensation expense
   Three Months Ended   Nine Months Ended 
   September 30,       September 30, 
   2022   2021   2022     2021   
                 
Research and development  $-   $1   $4   $2 
Selling, general and administrative   139    213    565    548 
Total stock-based compensation expense  $139   $214   $569   $550