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Common Stock Purchase Warrants (Tables)
9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Summary of Warrant Activity

The following table summarizes information about shares issuable under warrants outstanding during the nine months ended September 30, 2020:

 

    Warrants    

Weighted

average

exercise

price

 
Vested Balance, January 1, 2020     4,824,573     $ 5.15  
Granted     1,273,374       1.31  
Exercised     (2,704,583 )     (1.95 )
Cancelled     (5,000 )     (16.50 )
Vested Balance, September 30, 2020     3,388,364     $ 6.24  
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 common shares as of September 30, 2020:

 

      Outstanding and exercisable warrants  
Exercise price     Number of warrants    

Weighted average remaining

contractual life

 
$ 2.60       465,712       2.8 years  
$ 3.00       316,800       2.5 years  
$ 3.36       166,667       1.4 years  
$ 3.36       566,666       2.4 years  
$ 3.65       167,000       1.7 years  
$ 3.75       25,753       1.9 years  
$ 5.00       800,000       1.2 years  
$ 13.43       879,766       0.3 years  
                     
          3,388,364       1.6 years