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Convertible Preference Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 07, 2017
Mar. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Preferred Units [Line Items]          
Stock Issued During Period, Shares, Convertible Preferred Shares     90,220,000    
Accretion on Convertible Preferred Shares     $ (6,352) $ 0 $ 0
Series 4 Convertible Preferred Stock [Domain]          
Preferred Units [Line Items]          
Proceeds from Issuance of Convertible Preferred Stock     $ 95,000 $ 0 $ 0
Preferred Stock [Member] | Series 4 Convertible Preferred Stock [Domain]          
Preferred Units [Line Items]          
Stock Issued During Period, Shares, Convertible Preferred Shares 95,000   95,000,000    
Proceeds from Issuance of Convertible Preferred Stock $ 95,000        
Stock Issued During Period, Value, Convertible Preferred Shares $ 90,220   $ 90,220    
Preferred Stock, Liquidation Preference Per Share $ 1,000        
Preferred Stock, Conversion Price, Preference Per Share $ 10.00        
Preferred Stock, Accretion Percentage, Preference Per Share 8.00%        
Preferred Stock, Accretion Rate, Preference Per Share     $ 6.97    
Preferred Stock, Liquidation Preference, Value     $ 101,352    
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price   125.00%