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Common Stock Warrants
 6 Months Ended
Jun. 30, 2022
Common Stock Warrants [Abstract]  
Common Stock Warrants
6. Common Stock Warrants


The following table summarizes the common stock warrant activity from December 31, 2020 through June 30, 2022:
 
 
  
Shares
    
Weighted Average
Exercise Price
  
Outstanding, December 31, 2021
    
10,857,964
    
$
4.37
  
Granted
    
—
      
—
  
Exercised
    
—
      
—
  
Forfeited/cancelled
    
—
      
—
  
Outstanding, June 30, 2022
    
10,857,964
    
$
4.37
  



The weighted average expiration of the warrants outstanding as of June 30, 2022 is 2.2 years.