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Financial Risk Management Objectives - Additional Information (Detail) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Copper costs as a percentage of product cost | 82.00% | 85.00% |  |
Cash and cash equivalents | $ 53,673 | $ 60,778 | $ 46,093 | $ 48,231
Unutilized amounts of bank loans | 208,000 |  |  |
Financial liabilities | 35,000 |  |  |
Mortgage of land, buildings, machinery and equipment, investment properties and land use rights | 15,099 | 9,084 |  |
Pledge of other receivables | 4,847 | 7,525 |  |
Assets and uncalled capital pledged as security | 1,339 | 1,200 |  |
Subsidiary [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Assets and uncalled capital pledged as security | $ 27,454 | $ 27,731 |  |
One major customer [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Percentage of trade receivables from one customer | 9.31% | 8.20% |  |
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 | $ 46 | $ 64 |  |
Top Of Range [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Percentage of financial liabilities bear floating interest rate | 25.00% |  |  |
Weighted average [Member] |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |
Weighted average interest rates on bank loans and overdrafts | 3.72% | 3.68% |  |

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