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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, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2019 THB (฿) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 SGD ($) | Dec. 31, 2018 THB (฿) | Dec. 31, 2018 CNY (¥)
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 11,356 | $ 24,814 |  |  |  |  |
Renminbi (RMB) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity | Mar. 2020 ~ Sept. 2020 | Jan. 2019 ~ Sept. 2019 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 2,929 | $ 6,130 |  | ¥ 20,400 |  |  | ¥ 42,100
Renminbi (RMB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 5.00% | 4.70% | 5.00% | 5.00% | 5.00% | 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 | 5.50% | 4.79% | 5.50% | 5.50% | 5.50% | 4.79% | 4.79%
Thai Baht (THB) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Maturity | Jan. 2020 ~ Jun. 2020 | Jan. 2019 ~ Jun. 2019 |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 5,423 | $ 18,684 | ฿ 161,018 |  |  | ฿ 602,150 |
Thai Baht (THB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 1.90% | 1.10% | 1.90% | 1.90% | 1.90% | 1.10% | 1.10%
Thai Baht (THB) [Member] | Top Of Range [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 2.70% | 2.10% | 2.70% | 2.70% | 2.70% | 2.10% | 2.10%
Singapore dollars (SGD) [Member] |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |
Current interest-bearing loans and borrowings, Interest rate | 3.05% |  | 3.05% | 3.05% | 3.05% |  |
Current interest-bearing loans and borrowings, Maturity | Feb. 2020 ~ Apr. 2020 |  |  |  |  |  |
Current interest-bearing loans and borrowings, Amount | $ 3,004 |  |  |  | $ 4,042 |  |

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