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WARRANTS (Tables)
 9 Months Ended
Sep. 30, 2021
Warrants  
During the nine months ended September 30, 2021, the Company did not issue any warrants. The following table summarizes information about common stock warrants outstanding at September 30, 2021:

During the nine months ended September 30, 2021, the Company did not issue any warrants. The following table summarizes information about common stock warrants outstanding at September 30, 2021:

 

Outstanding   Exercisable 
       Weighted             
       Average   Weighted       Weighted 
       Remaining   Average       Average 
Exercise  Number   Contractual   Exercise   Number   Exercise 
Price  Outstanding   Life (Years)   Price   Exercisable   Price 
$—   6,500    2.50   $—    6,500   $— 
$0.88 - $3.01   5,864,410    2.99   $1.81    5,864,410     $1.81  
 $8.00 - $19.80   53,452    2.63   $12.74    53,452     $12.74  
 $440 - $920   16,225    1.45   $733.40    16,225     $733.40  
 $1,040 - $2,000   2,367    1.43   $1,404.85    2,367     $1,404.85  
$0.88 - $2,000.00   5,942,954    3.98   $4.46    5,942,954   $4.46 
The Company utilized the Black-Scholes option pricing model and the assumptions used during the nine months ended September 30, 2021

The Company utilized the Black-Scholes option pricing model and the assumptions used during the nine months ended September 30, 2021:

 

   
Exercise price $0.88 - $3.01
Remaining contractual term (in years) 1.4 - 5.0
Volatility 86.3% - 104.6%
Risk free interest rate 0.17% - 1.38%
Expected dividend yield 0%