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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, $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2020 THB (฿) | Dec. 31, 2020 AUD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 SGD ($) | Dec. 31, 2019 THB (฿) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2019 SGD ($)
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Amount | $ 13,781 | $ 11,356 |  |  |  |  |  |  |
Australia Dollars[Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 3.07% |  | 3.07% | 3.07% | 3.07% | 3.07% |  |  |
Interest-bearing loans and borrowings, Maturity | Mar. 2045 |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Amount | $ 3,764 |  |  | $ 4,883 |  |  |  |  |
Renminbi (RMB) [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Maturity | Jun. 2021 | Mar. 2020 ~ Sept. 2020 |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Amount | $ 2,736 | $ 2,929 |  |  | ¥ 17,800 |  |  | ¥ 20,400 |
Renminbi (RMB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 4.50% | 5.00% | 4.50% | 4.50% | 4.50% | 4.50% | 5.00% | 5.00% | 5.00%
Renminbi (RMB) [Member] | Top Of Range [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 4.90% | 5.50% | 4.90% | 4.90% | 4.90% | 4.90% | 5.50% | 5.50% | 5.50%
Thai Baht (THB) [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Maturity | Mar. 2021 | Jan. 2020 ~ Jun. 2020 |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Amount | $ 2,488 | $ 5,423 | ฿ 74,176 |  |  |  | ฿ 161,018 |  |
Thai Baht (THB) [Member] | Bottom of range [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 0.90% | 1.90% | 0.90% | 0.90% | 0.90% | 0.90% | 1.90% | 1.90% | 1.90%
Thai Baht (THB) [Member] | Top Of Range [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 1.00% | 2.70% | 1.00% | 1.00% | 1.00% | 1.00% | 2.70% | 2.70% | 2.70%
Singapore dollars (SGD) [Member] |  |  |  |  |  |  |  |  |
Disclosure of detailed information about borrowings [Line Items] |  |  |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Interest rate | 2.32% | 3.05% | 2.32% | 2.32% | 2.32% | 2.32% | 3.05% | 3.05% | 3.05%
Interest-bearing loans and borrowings, Maturity | Apr. 2021 | Feb. 2020 ~ Apr. 2020 |  |  |  |  |  |  |
Interest-bearing loans and borrowings, Amount | $ 4,793 | $ 3,004 |  |  |  | $ 6,332 |  |  | $ 4,042

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