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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2022
Share-Based Payment Arrangement [Abstract]  
Schedule of stock option activity
   Number of
Options
   Weighted
Average
Exercise
Price
   Weighted
Average
Remaining
Life
  Intrinsic
Value
 
Outstanding at December 31, 2021   5,592,137   $2.29   8.6 years  $9,912 
Granted   780,000   $2.78         
Outstanding at March 31, 2022   6,372,137   $2.35    8.5 years  $4,831 
                   
Exercisable as of March 31, 2022   2,646,608   $1.15   7.9 years  $4,012 
                   
Vested and expected to vest as of March 31, 2022   6,321,937   $2.36    8.6 years  $4,712 

 

Schedule of weighted average assumptions for fair value of options estimated
   Three Months Ended
March 31,
 
   2022   2021 
         
Dividend yield   
%   
%
Expected volatility   61.98%   67.70%
Risk-free interest rate   1.90%   0.64%
Expected life   6.03 years    6.05 years 

 

Schedule of stock-based compensation expense to employees and non-employees
   Three Months Ended March 31, 
   2022   2021 
Research and development  $305   $79 
General and administrative   410    276 
   $715   $355