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Financial Risk Management Objectives - Additional Information (Detail) - USD ($) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Aug. 13, 2014
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |
Copper costs as a percentage of product cost | 85.00% | 80.00% |  |  |
Cash and cash equivalents | $ 60,778,000 | $ 46,093,000 | $ 48,231,000 | $ 51,303,000 |
Unutilized amounts of bank loans | 182,000,000 |  |  |  |
Financial liabilities | 49,170,000 | 77,560,000 |  |  | $ 0
Mortgage of land, buildings, machinery and equipment, investment properties and land use rights | 9,084,000 | 8,633,000 |  |  |
Pledge of other receivables | 7,525,000 | 7,528,000 |  |  |
Assets and uncalled capital pledged as security | 1,200,000 | 1,181,000 |  |  |
Subsidiary [Member] |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |
Assets and uncalled capital pledged as security | $ 27,731,000 | $ 32,715,000 |  |  |
One major customer [Member] |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |
Percentage of trade receivables from one customer | 8.20% | 22.40% |  |  |
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 | $ 64,000 | $ 113,000 |  |  |
Top of range [Member] |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |
Percentage of financial liabilities bear floating interest rate | 40.00% |  |  |  |
Weighted average [Member] |  |  |  |  |
Disclosure Of Financial Instruments [Line Items] |  |  |  |  |
Weighted average interest rates on bank loans and overdrafts | 3.68% | 2.85% |  |  |

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