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