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Convertible Preference Shares (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Mar. 14, 2019 | Mar. 07, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Preferred Units [Line Items] |  |  |  |  |
Stock Issued During Period, Value, Convertible Preferred Shares |  |  | $ (97) |  |
Accretion on Convertible Preferred Shares |  |  | (8,355) | $ 6,352 | $ 0
Convertible preference shares |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  |  | $ 0 | $ 95,000 | $ 0
Convertible Preference Shares | Convertible preference shares |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |
Stock Issued During Period, Shares, Convertible Preferred Shares |  | 95,000 |  |  |
Proceeds from Issuance of Convertible Preferred Stock |  | $ 95,000 |  |  |
Stock Issued During Period, Value, Convertible Preferred Shares |  | $ 90,123 |  |  |
Preferred Stock, Conversion Price, Preference Per Share | $ 7.42 | $ 10.00 |  |  |
Preferred Stock, Accretion Rate, Preference Per Share |  |  | $ 7.55 | $ 6,970.00 |
Accretion on Convertible Preferred Shares |  |  | $ (8,355) | $ (36,254) |
Preferred Stock, Liquidation Preference, Value |  |  |  | $ 109,707 |
Subsequent Event [Member] | Convertible Preference Shares | Series 6 Convertible Preferred Shares [Member] |  |  |  |  |
Preferred Units [Line Items] |  |  |  |  |
Proceeds from Issuance of Convertible Preferred Stock | $ 50,000 |  |  |  |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |  |  |  |
Preferred Stock, Accretion Percentage, Preference | 8.00% |  |  |  |
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price | 125.00% |  |  |  |
Preferred stock dividend rate | 7.00% |  |  |  |

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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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644 Reference 2: 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.(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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://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(d)(1)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21484-112644 + Details
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