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Common Stock Purchase Warrants (Tables)
9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
Summary of Warrant Activity

The warrants expire from July 15, 2020 through July 31, 2023 and allow for cashless exercise.

 

    Warrants     Weighted
average
exercise price
 
Vested Balance, January 1, 2019     4,693,145     $ 5.40  
Granted     571,428       1.81  
Exercised     (529,000 )     (2.96 )
Cancelled     (18,000 )     (3.50 )
Vested Balance, September 30, 2019     4,717,573     $ 5.23  

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, 2019:

 

      Outstanding and exercisable warrants
Exercise price     Number of warrants     Weighted average
remaining
contractual life
$ 1.81       571,428     4.9 years
$ 2.60       465,712     3.8 years
$ 3.00       701,667     3.5 years
$ 3.25       120,000     3.2 years
$ 3.36       880,000     3.2 years
$ 3.65       200,000     2.8 years
$ 3.75       94,000     2.9 years
$ 5.00       800,000     2.3 years
$ 13.43       879,766     1.3 years
$ 16.50       5,000     0.8 years
                 
          4,717,573     3.0 years