Warrants - Schedule of Activities of Warrants (Details) - Equity classified warrants - $ / shares	6 Months Ended	12 Months Ended
Jun. 30, 2019	Dec. 31, 2018
Number of shares
Outstanding and exercisable, beginning balance, shares	7,500,000
Warrants exercised, shares	2,096
Outstanding and exercisable, ending balance, shares	7,497,904	7,500,000
Weighted average exercise price
Outstanding and exercisable, beginning balance (usd per share)	$ 10.80
Warrants exercised (usd per share)	9.60
Outstanding and exercisable, ending balance (usd per share)	$ 10.80	$ 10.80
Weighted average remaining life
Outstanding and exercisable	2 years 3 months 18 days	2 years 10 months

Class Of Warrant Or Right Exercise Price Of Warrants Or Rights Exercised

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Class of Warrant or Right, Outstanding And Exercisable

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Class of Warrant or Right, Outstanding And Exercisable, Weighted Average Exercise Price

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Class of Warrant or Right, Outstanding and Exercisable, Weighted Average Remaining Contractual Term

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Class of Warrant or Right, Warrants Roll Forward [Roll Forward]

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Class of Warrant or Right, Warrants Weighted Average Exercise Price [Roll Forward]

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Class of Warrant or Right, Warrants, Weighted Average Remaining Contractual Term [Abstract]

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