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Basis of Preparation - Subsidiaries of the Company (Parenthetical) (Detail) $ in Thousands, ฿ in Millions, $ in Millions |  |  |  | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 30, 2019 USD ($) | Oct. 29, 2019 | Jun. 19, 2018 | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 USD ($) | Oct. 30, 2019 THB (฿) | Oct. 01, 2018 TWD ($)
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Effect from the changes in shareholding percentage in subsidiary |  |  |  | $ (298) |  |  |  |
Additional paid-in capital [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Effect from the changes in shareholding percentage in subsidiary | $ 40 |  |  | $ 40 |  | $ (232) |  |
YASHIN Energy Corporation Limited [Member] | Asia Pacific New Energy Corporation Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |  |
Cash transferred |  |  |  |  | $ 0.5 |  |  |
YADING Energy Corporation Limited [Member] | Asia Pacific New Energy Corporation Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  | 100.00% |  |  |
Cash transferred |  |  |  |  | $ 0.5 |  |  |
Charoong Thai Wire and Cable Public Company Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  | 50.93% | 50.93% |  |  |
Charoong Thai Wire and Cable Public Company Limited [Member] | Siam Fiber Optics Co., Ltd. [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest | 30.56% | 45.84% |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  |  | 30.00% |
Total cash consideration | ฿ |  |  |  |  |  |  | ฿ 9 |
Siam Fiber Optics Co., Ltd. [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  | 45.84% | 30.56% |  |  |
Percentage of equity interest held by subsidiary |  |  |  | 90.00% | 60.00% |  |  |
Asia Pacific New Energy Corporation Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  | 100.00% | 100.00% | 100.00% |  |  |
Authorized Share Capital |  |  |  |  |  |  |  | $ 500.0
Paid-up capital |  |  |  |  |  |  |  | $ 4.0

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