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Convertible Preference Shares (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 07, 2017 | Jun. 30, 2018 | Mar. 31, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Preferred Units [Line Items] |  |  |  |  |  |
Preferred Stock, Value, Issued |  |  |  |  | $ (97) |
Series 4 Convertible Preferred Stock |  |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |  |
Proceeds from issuance of convertible preference shares |  |  |  |  | $ 0 | $ 95,000
Convertible Preferred Stock | Series 4 Convertible Preferred Stock |  |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |  |
Stock issued during period, convertible preferred (shares) | 95,000 |  |  |  | 0 |
Proceeds from issuance of convertible preference shares | $ 95,000 |  |  |  |  |
Preferred Stock, Value, Issued | $ 90,123 |  |  |  | $ (97) |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |  |  |  |  |
Preferred Stock, Conversion Price, Preference Per Share | $ 10.00 |  |  |  |  |
Preferred Stock, Accretion Percentage, Preference | 8.00% |  |  |  |  |
Preferred Stock, Accretion Rate, Preference Per Share |  |  | $ 7.11 |  | $ 7.25 |
Accretion on convertible preferred shares |  | $ 2,068 |  | $ 1,910 | $ 4,095 |
Preferred Stock, Liquidation Preference, Value |  | $ 105,447 |  |  | $ 105,447 |
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price |  |  |  |  | 125.00% |
Preferred Stock, Liquidation Preference Percentage Rate, Change of Control of the Company |  |  |  |  | 7.00% |

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- Definition Preferred Stock, Liquidation Preference Percentage Rate, Change of Control of the Company + References No definition available. + Details
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- Definition The per share liquidation preference (or restrictions) of nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) that has a preference in involuntary liquidation considerably in excess of the par or stated value of the shares. The liquidation preference is the difference between the preference in liquidation and the par or stated values of the share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 3: 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(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: 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(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: 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.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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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