Warrants - Summary of Warrants Activity (Details) - Warrant - $ / shares	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Class of Warrant or Right, Outstanding [Roll Forward]
Outstanding at beginning	14,449,000
Issued	47,812,000
Outstanding at ending	62,261,000	14,449,000
Exercisable at ending	62,261,000
Class of Warrant or Right, Exercise Price of Warrants or Rights [Roll Forward]
Outstanding at beginning	$ 2.01
Issued	1.47
Outstanding at ending	1.60	$ 2.01
Exercisable at ending	$ 1.60
Class of Warrant or Right, Weighted Average Remaining Contractual Life of Warrants or Rights [Roll Forward]
Outstanding at ending	4 years 10 months 24 days	3 years 1 month 6 days
Exercisable at ending	4 years 10 months 24 days