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Cash Flow Information - Summary of Non-cash Transactions With Non-controlling Interests (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Disclosure Of Reconciliation Of Liabilities Arising From Financing Activities [Abstract]  
Conversion of debt to equity $ 167
Conversion of preference shares to ordinary shares (399)
Net decrease in additional paid-in capital $ (232)