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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]	6 Months Ended
	Jun. 30, 2019 $ / shares shares
Outstanding and exercisable warrants, Weighted average remaining contractual life	2 years 10 months 25 days
Exercise Price Range One [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 2.60
Outstanding and exercisable warrants, Number of warrants	465,712
Outstanding and exercisable warrants, Weighted average remaining contractual life	4 years 1 month 6 days
Exercise Price Range Two [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 3.00
Outstanding and exercisable warrants, Number of warrants	701,667
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	$ 3.25
Outstanding and exercisable warrants, Number of warrants	120,000
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	$ 3.36
Outstanding and exercisable warrants, Number of warrants	880,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	3 years 4 months 24 days
Exercise Price Range Five [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 3.50
Outstanding and exercisable warrants, Number of warrants	18,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	1 month 6 days
Exercise Price Range Six [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 3.65
Outstanding and exercisable warrants, Number of warrants	200,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	3 years
Exercise Price Range Seven [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 3.75
Outstanding and exercisable warrants, Number of warrants	94,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	3 years 1 month 6 days
Exercise Price Range Eight [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 5.00
Outstanding and exercisable warrants, Number of warrants	800,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	2 years 6 months
Exercise Price Range Nine [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 13.43
Outstanding and exercisable warrants, Number of warrants	879,766
Outstanding and exercisable warrants, Weighted average remaining contractual life	1 year 6 months
Exercise Price Range Ten [Member]
Outstanding and exercisable warrants, Exercise price | $ / shares	$ 16.50
Outstanding and exercisable warrants, Number of warrants	5,000
Outstanding and exercisable warrants, Weighted average remaining contractual life	1 year
Outstanding and exercisable warrants, Number of warrants	4,164,145

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