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Cash Flow Information - Summary of Financing Activities with no Cash Flow Effects (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
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 | $ 0 | $ (232)

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