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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of summarizes activity for stock options under all plans
           Weighted-     
   Number of       Average     
   Shares   Weighted-   Remaining   Aggregate 
   Underlying   Average   Contractual   Intrinsic 
   Outstanding   Exercise   Term   Value 
   Options   Price   (in years)   (in thousands) 
Outstanding, December 31, 2021   1,211,068    3.19    8.66          321 
Options granted   19,000                
Options forfeited   
-
                
Options exercised   (64,671)   0.34           
Outstanding, September 30, 2022   1,165,397    3.31    8.28    57 
                     
Options vested and exercisable as of September 30, 2022   640,747   $3.23    7.97   $57 

 

Schedule of Company has recorded stock-based compensation expense, allocated by functional cost
   Three Months Ended   Nine Months Ended 
   September 30,   September 30, 
   2021   2022   2021   2022 
                 
Research and development  $167   $103   $623   $303 
General and administrative   72    163    112    547 
Total stock-based compensation  $239   $266   $735   $850 

 

Schedule of fair value of awards granted to employees, directors and non-employees
    Nine Months Ended  
    September 30,  
    2021     2022  
Expected volatility       102.00 – 105.00 %     101.00 - 105.00 %
Risk-free interest rate       0.61 - 0.92 %     2.90 - 2.92 %
Dividend yield     - %     - %
Expected term       5.13 – 6.25 years       6.25 years