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Shareholders Equity (Details) - USD ($) $ / shares in Units, $ in Millions | Jun. 25, 2018 | May 25, 2018 | May 22, 2018 | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | ---
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common stock issued | 14,375,000 |  |  | 62,106,121 | 47,534,979
Common stock, par value |  |  |  | $ 0.0001 | $ 0.0001
Net proceeds | $ 53.8 |  |  |  |
Offering |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common stock issued |  |  | 12,500,000 |  |
Common stock, par value |  |  | $ 0.0001 |  |
Public offering price |  |  | $ 4.00 |  |
Net proceeds |  | $ 46.7 |  |  |
Underwriters' option |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |
Common stock issued | 1,875,000 |  | 1,875,000 |  |
Public offering price | $ 4.00 |  |  |  |
Purchase price |  |  | $ 3.76 |  |
Number of days to underwriters to sell additional common shares |  |  | 30 days |  |
Net proceeds | $ 7.1 |  |  |  |

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- Definition Number of days given to the underwriter to sell additional shares over the initial allotment, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Face amount or stated value per share of common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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