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Common Stock Purchase Warrants (Tables)
6 Months Ended
Jun. 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            
Exercised     (529,000)       (2.96)  
Cancelled            
Vested Balance, June 30, 2019     4,164,145     $ 5.71  
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 June 30, 2019:

 

      Outstanding and exercisable warrants
Exercise price     Number of
warrants
    Weighted
average

remaining
contractual life
$ 2.60       465,712     4.1 years
$ 3.00       701,667     3.8 years
$ 3.25       120,000     3.5 years
$ 3.36       880,000     3.4 years
$ 3.50       18,000     0.1 years
$ 3.65       200,000     3.0 years
$ 3.75       94,000     3.1 years
$ 5.00       800,000     2.5 years
$ 13.43       879,766     1.5 years
$ 16.50       5,000     1.0 years
          4,164,145     2.9 years