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Subsequent Events - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2019 | Mar. 31, 2019 | May 31, 2019 | Dec. 31, 2018 | Jul. 16, 2018 | May 31, 2018 | Dec. 29, 2017
Subsequent Event [Line Items] |  |  |  |  |  |  |
Exercise price (usd per share) |  |  |  |  | $ 2.10 | $ 6.59 | $ 7.42
Number of securities called by warrants (in shares) |  |  |  |  | 11,520,000 |  | 316,163
Exercised (in shares) |  |  |  | 4,050,000 |  |  |
Warrant Exercise Agreement | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Warrants exercisable (in shares) | 3,800,000 |  |  |  |  |  |
Exercise price (usd per share) | $ 1.10 |  |  |  |  |  |
Proceeds from issuance of warrants | $ 1.3 |  |  |  |  |  |
Exercised (in shares) | 1,200,000 |  |  |  |  |  |
Class of warrant or right, new warrants issued (in shares) | 1,200,000 |  |  |  |  |  |
Common Stock | Warrant Exercise Agreement | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Exercise price (usd per share) | $ 1.40 |  |  |  |  |  |
Number of securities called by warrants (in shares) | 3,800,000 |  |  |  |  |  |
Forecast |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of warrants |  | $ 4.2 |  |  |  |  |
Forecast | Warrant Exercise Agreement | Subsequent Event |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of warrants |  |  | $ 4.2 |  |  |  |

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- Definition Class Of Warrant Or Right Exercised + References No definition available. + Details
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- Definition Class Of Warrant Or Right, New Warrants Issued + References No definition available. + Details
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- Definition Class Of Warrant Or Right Outstanding, Exercisable + 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 The cash inflow from issuance of rights to purchase common shares at predetermined price (usually issued together with corporate debt). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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