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Warrants to Acquire Shares of Common Stock (Warrants Classified as Equity) (Details) | Jul. 16, 2018 $ / shares shares | Dec. 29, 2017 year $ / shares shares | Sep. 30, 2018 | May 31, 2018 $ / shares
--- | --- | --- | --- | ---
Class of Warrant or Right [Line Items] |  |  |  |
Warrants issued (in shares) | shares | 11,520,000 | 316,163 |  |
Exercise price (usd per share) | $ 2.10 | $ 7.42 |  | $ 6.59
Warrant term | 5 years | 5 years |  |
Fair value of warrants granted, per share |  | $ 5.60 |  |
Measurement Input, Price Volatility |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants and rights outstanding, measurement input |  | 0.9010 |  |
Measurement Input, Expected Term |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants and rights outstanding, measurement input | year |  | 5 |  |
Measurement Input, Risk Free Interest Rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants and rights outstanding, measurement input |  | 0.0220 | 0 |
Measurement Input, Expected Dividend Rate |  |  |  |
Class of Warrant or Right [Line Items] |  |  |  |
Warrants and rights outstanding, measurement input |  | 0 | 0 |

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- Definition Class of Warrant or Right, Term + References No definition available. + Details
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- Definition Fair Value of Warrants Granted, per Share + 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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -URI http://asc.fasb.org/extlink&oid=99377789&loc=d3e19207-110258 + Details
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