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Common Stock Purchase Warrants - Summary of Range of Exercise Prices and Weighted Average Remaining Contractual Life of Warrants (Details) - Warrants [Member]
9 Months Ended
Sep. 30, 2019
$ / shares
shares
Outstanding and exercisable warrants, Exercise price | $ / shares
Outstanding and exercisable warrants, Number of warrants | shares 4,717,573
Outstanding and exercisable warrants, Weighted average remaining contractual life 3 years
Exercise Price Range One [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 1.81
Outstanding and exercisable warrants, Number of warrants | shares 571,428
Outstanding and exercisable warrants, Weighted average remaining contractual life 4 years 10 months 25 days
Exercise Price Range Two [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 2.60
Outstanding and exercisable warrants, Number of warrants | shares 465,712
Outstanding and exercisable warrants, Weighted average remaining contractual life 3 years 9 months 18 days
Exercise Price Range Three [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 3.00
Outstanding and exercisable warrants, Number of warrants | shares 701,667
Outstanding and exercisable warrants, Weighted average remaining contractual life 3 years 6 months
Exercise Price Range Four [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 3.25
Outstanding and exercisable warrants, Number of warrants | shares 120,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 3 years 2 months 12 days
Exercise Price Range Five [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 3.36
Outstanding and exercisable warrants, Number of warrants | shares 880,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 3 years 2 months 12 days
Exercise Price Range Six [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 3.65
Outstanding and exercisable warrants, Number of warrants | shares 200,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 2 years 9 months 18 days
Exercise Price Range Seven [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 3.75
Outstanding and exercisable warrants, Number of warrants | shares 94,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 2 years 10 months 25 days
Exercise Price Range Eight [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 5.00
Outstanding and exercisable warrants, Number of warrants | shares 800,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 2 years 3 months 19 days
Exercise Price Range Nine [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 13.43
Outstanding and exercisable warrants, Number of warrants | shares 879,766
Outstanding and exercisable warrants, Weighted average remaining contractual life 1 year 3 months 19 days
Exercise Price Range Ten [Member]  
Outstanding and exercisable warrants, Exercise price | $ / shares $ 16.50
Outstanding and exercisable warrants, Number of warrants | shares 5,000
Outstanding and exercisable warrants, Weighted average remaining contractual life 9 months 18 days