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WARRANTS (Tables)
3 Months Ended
Mar. 31, 2021
Warrants  
Schedule of common stock warrants outstanding

During the three months ended March 31, 2021, the Company did not issue any warrants. The following table summarizes information about common stock warrants outstanding at March 31, 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     3.00     $     6,500     $  
$0.88 - $1.91   3,237,016     4.05     $ 1.43     3,237,016        $0.88 - $1.91  
$8.00 - $19.80   53,452     3.13     $ 12.74     53,452        $8.00 - $19.80  
$440 - $920   16,225     1.95     $ 733.40     16,225        $440 - $920  
$1,040 - $2,000   2,367     1.93     $ 1,404.85     2,367        $1,040 - $2,000  
$0.88 - $2,000   3,315,560     4.02     $ 6.19     3,315,560     $ 6.19  
Schedule of option pricing

The Company utilized the Black-Scholes option pricing model and the assumptions used during the three months ended March 31, 2020:

 

Exercise price $0.88 - $1.91
Remaining contractual term (in years) 5.0
Volatility 86.3%
Weighted average risk free interest rate 0.46% — 1.38%
Expected dividend yield 0%