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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions | Mar. 14, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Subsequent Event [Line Items] |  |  |
Preferred stock, shares issued |  | 95,000 | 95,000
Common Class A | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Price per share | $ 3.50 |  |
Common Class A | Common Stock | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Class A shares issued | 14,285,714 |  |
Proceeds from sale of Class A shares | $ 50 |  |
Series 6 Convertible Preferred Shares [Member] | Convertible Preference Shares | Subsequent Event [Member] |  |  |
Subsequent Event [Line Items] |  |  |
Series 6 convertible preference shares issued | 50,000 |  |
Proceeds from issuance of Series 6 convertible preference shares | $ 50 |  |
Preferred Stock, Convertible Preference Shares, Convertible By Holder, Term | 1 year |  |
Preferred Stock, Liquidation Preference Per Share | $ 1,000 |  |
Initial conversion price per Preference Share | $ 5.00 |  |
Accretion rate of preferred stock | 8.00% |  |
Accretion period of preferred stock | 5 years |  |
Term preferred stock convertible at company's option | 2 years |  |
Percentage of conversion price | 125.00% |  |
Preferred stock dividend rate | 7.00% |  |
Percent of ownership in common shares triggering limit to conversion of preferred shares | 19.90% |  |
Preferred stock conversion ratio to common stock | 1 |  |

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- Definition Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price + 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://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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