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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Bank overdrafts balance | $ 0 | $ 0 |  |
Financial liabilities settlement period | 60 days |  |  |
Financial liabilities repayment term | Trade and other payables are presented as current liabilities unless payment is not due within 12 months after the reporting period. |  |  |
Unused net operating losses | $ 16,762 | 13,756 |  |
Net deferred tax assets | $ (6) | (132) | $ 526 | $ 1,601
Period for custodial service | 6 months |  |  |
Unused tax losses [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Net deferred tax assets | $ 644 | $ 197 |  |
Bottom of range [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of investment property depreciated using the straight-line method | 20 years |  |  |
Bottom of range [Member] | Computer software [member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of intangible assets | 2 years |  |  |
Top of range [Member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Estimated useful lives of investment property depreciated using the straight-line method | 30 years |  |  |
Ownership percentage with voting right | 20.00% |  |  |
Top of range [Member] | Computer software [member] |  |  |  |
Disclosure Of Significant Accounting Policies [Line Items] |  |  |  |
Useful life of intangible assets | 10 years |  |  |

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