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Basis of Preparation - Subsidiaries of the Company (Parenthetical) (Detail) $ in Thousands, shares in Millions, $ in Millions |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jun. 19, 2018 | Jun. 30, 2017 USD ($) | Jun. 29, 2017 | Dec. 31, 2017 shares | Sep. 30, 2013 USD ($) shares | Dec. 31, 2018 TWD ($) | Dec. 31, 2017 USD ($) shares | Oct. 01, 2018 TWD ($)
Additional paid-in capital [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Effect from the changes in shareholding percentage in subsidiary |  |  |  |  |  |  | $ (232) |
Asia Pacific New Energy Corporation Limited [Member] | YASHIN Energy Corporation Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of voting equity interests acquired |  |  |  |  |  | 100.00% |  |
Cash transferred |  |  |  |  |  | $ 0.5 |  |
Asia Pacific New Energy Corporation Limited [Member] | YADING 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% |
Siam Fiber Optics Co., Ltd. [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  | 30.56% | 30.56% |
Percentage of equity interest held by subsidiary |  |  |  |  |  | 60.00% |  |
Shanghai Yayang Electric Co., Ltd. [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  | 68.75% |  |  |  | 68.75% | 68.75% |
Increase (decrease) in proportion of ownership interest in subsidiary |  | 2.40% |  |  |  |  |  |
Shanghai Yayang Electric Co., Ltd. [Member] | Crown Century Holdings Limited ("CCH (HK)") [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  | 37.92% | 31.42% |  |  |  |  |
Adjustments to additional paid in capital by conversion of loan |  | $ 1,000 |  |  |  |  |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  |  |  | 97.93% | 97.93% |
Adjustments to additional paid in capital through issuance of converting preference shares |  |  |  |  | $ 2,000 |  |  |
Number of preference shares converted into ordinary shares | shares |  |  |  | 7.8 |  |  | 7.8 |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Preference shares [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Number of shares issued | shares |  |  |  |  | 7.8 |  |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Ningbo Pacific Cable Co Ltd and Pacific Electric Wire & Cable (Shenzhen) Co Ltd [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  | 97.93% |  |  |  |
Increase (decrease) in proportion of ownership interest in subsidiary |  |  |  | (2.07%) |  |  |  |
Crown Century Holdings Limited ("CCH (HK)") [Member] | Australia Pacific Electric Cable Pty Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest |  |  |  | 98.06% |  |  |  |
Increase (decrease) in proportion of ownership interest in subsidiary |  |  |  | (1.34%) |  |  |  |
Asia Pacific New Energy Corporation Limited [Member] |  |  |  |  |  |  |  |
Disclosure of subsidiaries [Line Items] |  |  |  |  |  |  |  |
Percentage of equity interest | 100.00% |  |  |  |  | 100.00% |  |
Registered capital |  |  |  |  |  |  |  | $ 500.0
Paid-up capital |  |  |  |  |  |  |  | $ 4.0

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