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Financial Assets and Financial Liabilities - Summary of Interest-bearing Loans and Borrowings (Detail) ฿ in Thousands, ¥ in Thousands, $ in Thousands, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 CNY (¥) | Dec. 31, 2018 THB (฿) | Dec. 31, 2017 CNY (¥) | Dec. 31, 2017 THB (฿) | Dec. 31, 2017 SGD ($)
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 24,814 | $ 41,151 |  |  |  |  |
United States of America, Dollars (USD) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity |  | Feb. 2018 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount |  | $ 3,800 |  |  |  |  |
United States of America, Dollars (USD) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate |  | 3.20% |  |  | 3.20% | 3.20% | 3.20%
United States of America, Dollars (USD) [Member] | Top of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate |  | 3.50% |  |  | 3.50% | 3.50% | 3.50%
Renminbi (RMB) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity | Jan. 2019 ~ Sept. 2019 | Apr. 2018 ~ Sept. 2018 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 6,130 | $ 4,602 | ¥ 42,100 |  | ¥ 30,000 |  |
Renminbi (RMB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 4.70% | 4.70% | 4.70% | 4.70% | 4.70% | 4.70% | 4.70%
Renminbi (RMB) [Member] | Top of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 4.79% | 5.22% | 4.79% | 4.79% | 5.22% | 5.22% | 5.22%
Thai Baht (THB) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity | Jan. 2019 ~ Jun. 2019 | Jan. 2018 ~ Jun. 2018 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 18,684 | $ 32,649 |  | ฿ 602,150 |  | ฿ 1,058,995 |
Thai Baht (THB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 1.10% | 1.70% | 1.10% | 1.10% | 1.70% | 1.70% | 1.70%
Thai Baht (THB) [Member] | Top of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 2.10% | 2.60% | 2.10% | 2.10% | 2.60% | 2.60% | 2.60%
Singapore dollars (SGD) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity |  | Feb. 2018 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount |  | $ 100 |  |  |  |  | $ 134
Singapore dollars (SGD) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate |  | 2.47% |  |  | 2.47% | 2.47% | 2.47%
Singapore dollars (SGD) [Member] | Top of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate |  | 2.54% |  |  | 2.54% | 2.54% | 2.54%

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