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Convertible Preference Shares (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Mar. 31, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Preferred Units [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Convertible Preferred Shares |  |  |  | 90,220,000 |  |
Series 4 Convertible Preferred Stock [Domain] |  |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |  |
Proceeds from issuance of convertible preference shares |  |  |  | $ 95,000 | $ 0 |
Convertible Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain] |  |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |  |
Stock Issued During Period, Shares, Convertible Preferred Shares |  | 95,000 |  | 95,000 |  | 0
Preferred Stock, Value, Issued |  |  |  | $ 90,220 |  |
Accretion on convertible preferred shares | $ 1,948 |  | $ 0 | 4,365 | $ 0 |
Preferred Stock, Liquidation Preference, Value | $ 99,365 |  |  | $ 99,365 |  | $ 0
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price |  | 125.00% |  |  |  |

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- Definition Stock Issued During Period, Value, Convertible Preferred Shares + References No definition available. + Details
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- Definition Value of the difference between preference in liquidation and the par or stated values of the preferred shares. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The cash inflow from issuance of preferred stocks identified as being convertible into another form of financial instrument, typically the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585 + Details
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