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Financial Instruments (Details) - USD ($) $ / shares in Units, shares in Millions		12 Months Ended
	Sep. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Exercise price of warrants	$ 2.29
Warrant liability		$ 11,466,162	$ 6,727,409
Loss from increase in fair value of warrant liability		$ 4,738,753	894,785	$ 0
Warrants
Class of Stock [Line Items]
Warrants purchased, value	4.0
Exercise price of warrants	$ 1.50
Class of warrant or right, outstanding	2.7
Exercisable period for warrants (in years)	10 years
Subscription Right | Warrants
Class of Stock [Line Items]
Exercise price of warrants	$ 1.50
Warrants
Class of Stock [Line Items]
Fair value assumptions, expected term		8 years 8 months 1 day
Warrant liability	$ 5,800,000	$ 11,500,000
Risk free interest rate (as a percent)	1.60%	2.38%
Expected dividend rate (as a percent)	0.00%	0.00%
Fair value assumptions, expected volatility rate	80.00%	75.00%
Loss from increase in fair value of warrant liability		$ 4,700,000	$ 900,000

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Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(i)(4))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
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Expected dividends to be paid to holders of the underlying shares or financial instruments (expressed as a percentage of the share or instrument's price).

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-Publisher FASB
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Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price.

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Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price.

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