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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%