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Financial Instruments (Details) $ / shares in Units, shares in Millions		3 Months Ended		6 Months Ended
	Sep. 02, 2016 USD ($) $ / shares shares	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Class of Warrant or Right [Line Items]
Fair value of warrant		$ 14,408,991		$ 14,408,991		$ 11,466,162
Increase in fair value of warrant liability		(400,000)	$ (300,000)	(2,942,829)	$ (331,853)
Warrants
Class of Warrant or Right [Line Items]
Warrants to purchase common stock | shares	4.0
Exercise price of warrants to purchase common stock | $ / shares	$ 2.29
Exercisable period for warrants (in years)	10 years
Fair value of warrant	$ 5,800,000	$ 14,400,000		$ 14,400,000
Warrants, measurement input		0.03		0.03
Warrants, term		8 years 2 months 1 day		8 years 2 months 1 day
Subscription Right
Class of Warrant or Right [Line Items]
Exercise price of warrants to purchase common stock | $ / shares	$ 1.50
Risk Free Interest Rate | Warrants
Class of Warrant or Right [Line Items]
Warrants, measurement input		0.0160		0.0160
Dividend Yield | Warrants
Class of Warrant or Right [Line Items]
Warrants, measurement input		0		0
Expected Life | Warrants
Class of Warrant or Right [Line Items]
Warrants, term		10 years		10 years
Volatility | Warrants
Class of Warrant or Right [Line Items]
Warrants, measurement input		0.80		0.80

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Class of Warrant or Right, Period from which Warrants or Rights are Exercisable

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