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Stock-based Compensation (Tables)
3 Months Ended
Mar. 31, 2024
Share-Based Payment Arrangement [Abstract]  
Schedule of Equtiy Compensation Plan by Arrangements

The following table contains information about the Company’s stock plan at March 31, 2024:

 

   Awards
Reserved for
Issuance
   Awards
Issued &
Exercised
   Awards
Available
for Grant
 
2013 Equity Compensation Plan   62,984,400*   50,712,275**   12,272,125 

 

* Increased by 8,690,581 on January 1, 2024, representing 4% of the total number of shares of common stock outstanding on December 31, 2023.
** Includes both restricted stock grants and option grants
Schedule of Recognized Stock Based Compensation

The Company recognized stock-based compensation expense (options and restricted share grants) in its condensed consolidated statements of operations as follows:

 

   Three Months Ended March 31, 
   2024   2023 
Research and Development  $415   $553 
General and Administrative   580    719 
Total  $995   $1,272 
Schedule of Stock Option Activity

The following table summarizes the activity for Company’ stock options for the three months ended March 31, 2024:

 

   Stock Options 
Outstanding at December 31, 2023   46,707,934 
Granted    
Exercised    
Forfeited    
Expired   (676,374)
Outstanding at March 31, 2024   46,031,560