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Common Stock Purchase Warrants (Tables)
3 Months Ended
Mar. 31, 2021
Equity [Abstract]  
Schedule of Fair Value of the Warrant Derivative Liabilities

The Company has utilized the following assumptions in its Black-Scholes option valuation model to calculate the estimated fair value of the warrant derivative liabilities as of their date of issuance and as of March 31, 2021:

  

    Issuance date assumptions     March 31, 2021 assumptions  
Volatility - range     106.6 – 166.6 %     106.7 %
Risk-free rate     0.08 - 0.49 %     0.92 %
Dividend     0 %     0 %
Remaining contractual term     0.01 - 5 years       4.8 years  
Exercise price   $ 2.80 - 3.25     $ 3.25  
Common stock issuable under the warrants     42,550,000       24,300,000  
Summary of Warrant Activity

The following table summarizes information about shares issuable under warrants outstanding during the three months ended March 31, 2021:

 

      Warrants    

Weighted

average

exercise  price

 
Vested Balance, January 1, 2021       3,388,364     $ 6.24  
Granted       42,550,000       3.11  
Exercised       (18,250,000 )     2.92  
Forfeited/cancelled       (879,766 )     13.43  
Vested Balance, March 31, 2021       26,808,598     $ 3.29  
Summary of Range of Exercise Prices and Weighted Average Remaining Contractual Life of Warrants

The following table summarizes the range of exercise prices and weighted average remaining contractual life for outstanding and exercisable warrants to purchase shares of common stock as of March 31, 2021:

 

      Outstanding and exercisable warrants
Exercise price     Number of warrants    

Weighted average

remaining

contractual life

$ 2.60       465,712     2.3 years
$ 3.00       316,800     2.0 years
$ 3.25       24,300,000     4.8 years
$ 3.36       733,333     1.7 years
$ 3.65       167,000     1.3 years
$ 3.75       25,753     1.4 years
$ 5.00       800,000     0.8 years
                 
          26,808,598     4.5 years