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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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- Definition Class of Warrant or Right, Period from which Warrants or Rights are Exercisable + References No definition available. + Details
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- Definition Noncash expense, not otherwise specified in the taxonomy, charged against earnings in the period to adjust the fair market value of liability classified warrants to purchase common stock. + References No definition available. + Details
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- Definition 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 + Details
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- Definition 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 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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