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Common Stock Purchase Warrants (Tables)
3 Months Ended
Mar. 31, 2020
Equity [Abstract]  
Summary of Warrant Activity

The following table summarizes information about shares issuable under warrants outstanding during the three months ended March 31, 2020:

 

    Warrants     Weighted
average
exercise
price
 
Vested Balance, January 1, 2020     4,824,573     $ 5.15  
Granted     35,750       1.40  
Exercised            
Cancelled            
Vested Balance, March 31, 2020     4,860,323     $ 5.12  

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 March 31, 2020:

 

      Outstanding and exercisable warrants  
Exercise price     Number of warrants     Weighted average
remaining
contractual life
 
$ 1.40       142,750       4.7 years  
$ 1.81       571,428       4.4 years  
$ 2.60       465,712       3.3 years  
$ 3.00       701,667       3.0 years  
$ 3.25       120,000       2.7 years  
$ 3.36       680,000       1.9 years  
$ 3.36       200,000       2.9 years  
$ 3.65       200,000       2.2 years  
$ 3.75       94,000       2.4 years  
$ 5.00       800,000       1.8 years  
$ 13.43       879,766       0.8 years  
$ 16.50       5,000       0.3 years  
                     
          4,860,323       2.5 years