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Financial Risk Management Objectives - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Copper costs as a percentage of product cost | 83.00% | 82.00% |  |
Cash and cash equivalents | $ 52,237 | $ 53,673 | $ 60,778 | $ 46,093
Unutilized amounts of bank loans | 200,000 |  |  |
Financial liabilities | 56,000 |  |  |
Mortgage of land, buildings, machinery and equipment, investment properties and land use rights | 15,078 | 15,099 |  |
Pledge of other receivables | 1,363 | 4,847 |  |
Assets pledged as security |  | 1,339 |  |
Subsidiary [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Assets pledged as security | $ 31,989 | $ 27,454 |  |
One major customer [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Percentage of trade receivables from one customer | 14.76% | 9.31% |  |
Interest rate risk [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Change of interest rates | 0.30% | 0.30% |  |
Change in profit before tax due to change of interest rates | $ 54 | $ 46 |  |
Top Of Range [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Percentage of financial liabilities bear floating interest rate | 14.00% |  |  |
Weighted average [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Weighted average interest rates on bank loans and overdrafts | 2.07% | 3.72% |  |

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