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Convertible Preference Shares (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 07, 2017
Mar. 31, 2018
Mar. 31, 2017
Preferred Units [Line Items]      
Preferred Stock, Value, Issued   $ (97)  
Series 4 Convertible Preferred Stock      
Preferred Units [Line Items]      
Proceeds from issuance of convertible preference shares   0 $ 95,000
Convertible Preferred Stock | Series 4 Convertible Preferred Stock      
Preferred Units [Line Items]      
Stock issued during period, convertible preferred (shares) 95,000   0
Proceeds from issuance of convertible preference shares $ 95,000    
Preferred Stock, Value, Issued $ 90,220 $ (97)  
Preferred Stock, Liquidation Preference Per Share $ 1,000    
Preferred Stock, Conversion Price, Preference Per Share $ 10.00    
Preferred Stock, Accretion Percentage, Preference 8.00%    
Preferred Stock, Accretion Rate, Preference Per Share   $ 7.11  
Accretion on convertible preferred shares   $ 2,027 $ 507
Preferred Stock, Liquidation Preference, Value   $ 103,379  
Preferred Stock, Conversion Basis, Common Stock Class A Closing Trade Price   125.00%  
Preferred Stock, Liquidation Preference Percentage Rate, Change of Control of the Company   7.00%