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Common Stock Purchase Warrants (Tables)
12 Months Ended
Dec. 31, 2019
Equity [Abstract]  
Summary of Warrant Activity

The following table summarizes information about shares issuable under warrants outstanding during the years ended December 31, 2019 and 2018:

 

    Warrants     Weighted
average
exercise price
 
Vested Balance, January 1, 2018     3,233,466     $ 6.57  
Granted     1,478,379       2.90  
Warrant reset     159,538       0.52  
Exercised     (171,738 )     (0.52 )
Cancelled     (42,500 )     (8.50 )
Vested Balance, December 31, 2018     4,657,145     $ 5.54  

 

    Warrants     Weighted
average
exercise price
 
Vested Balance, January 1, 2019     4,693,145     $ 5.40  
Granted     678,428       1.75  
Exercised     (529,000 )     (2.96 )
Cancelled     (18,000 )     (3.50 )
Vested Balance, December 31, 2019     4,824,573     $ 5.15  

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 December 31, 2019:

 

      Outstanding and exercisable warrants
Exercise price     Number of warrants     Weighted average
remaining
contractual life
$ 1.40       107,000     5.0 years
$ 1.81       571,428     4.6 years
$ 2.60       465,712     3.6 years
$ 3.00       701,667     3.3 years
$ 3.25       120,000     3.0 years
$ 3.36       680,000     2.2 years
$ 3.36       200,000     3.2 years
$ 3.65       200,000     2.5 years
$ 3.75       94,000     2.6 years
$ 5.00       800,000     2.0 years
$ 13.43       879,766     1.1 years
$ 16.50       5,000     0.5 years
                 
          4,824,573     2.8 years