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Common Stock Warrants
 6 Months Ended
Jun. 30, 2021
Common Stock Warrants
6. Common Stock Warrants
The following table summarizes the common stock warrant activity from December 31, 2020 through June 30, 2021:
 
     Shares      Weighted Average
Exercise Price		  
Outstanding, December 31, 2020
      12,538,204      $ 4.22  
Granted
      —          —    
Exercised
      (1,180,240 )       2.50  
Forfeited/cancelled
      —          —    
    
 
 
           
Outstanding, June 30, 2021
      11,357,964      $ 4.40  
    
 
 
           
The weighted average expiration of the warrants outstanding as of June 30, 2021 is 3.2 years.