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Cash Flow Information - Summary of Non-cash Transactions With Non-controlling Interests (Details) $ in Thousands | 12 Months Ended
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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)

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