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Earnings Per Share (Tables) | 12 Months Ended
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Dec. 31, 2019
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Summary of Earnings and Weighted Average Number of Ordinary Shares Outstanding in Computation of Earnings Per Share | The earnings and weighted average number of ordinary shares outstanding in the computation of earnings per share were as follows: Net profit for the year
|  | For the Year Ended December 31
|  | 2017 |  | 2018 |  | 2019
|  | NT$ |  | NT$ |  | NT$ |  | US$ (Note 4)
Profit for the year attributable to owners of the Company |  | $ | 22,819,119 |  |  | $ | 26,220,721 |  |  | $ | 17,060,591 |  |  | $ | 570,397 |
Effect of potentially dilutive ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
From subsidiaries’ potentially dilutive ordinary shares |  |  | (813,627 | ) |  |  | (418,295 | ) |  |  | (385,865 | ) |  |  | (12,901 | )
From the investments in associates |  |  | (367,687 | ) |  |  | — |  |  |  | — |  |  |  | — |
From convertible bonds |  |  | 93,781 |  |  |  | — |  |  |  | — |  |  |  | — |
Earnings used in the computation of diluted earnings per share |  | $ | 21,731,586 |  |  | $ | 25,802,426 |  |  | $ | 16,674,726 |  |  | $ | 557,496 |
Weighted average number of ordinary shares outstanding (in thousand shares):
|  | For the Year Ended December 31
|  | 2017 |  | 2018 |  | 2019
Weighted average number of ordinary shares in computation of basic earnings per share |  |  | 4,080,443 |  |  |  | 4,245,247 |  |  |  | 4,251,964 |
Effect of potentially dilutive ordinary shares: |  |  |  |  |  |  |  |  |  |  |  |
From convertible bonds |  |  | 62,456 |  |  |  | — |  |  |  | — |
From employee share options |  |  | 19,934 |  |  |  | 5,103 |  |  |  | 10,232 |
From employees’ compensation |  |  | 21,787 |  |  |  | 779 |  |  |  | 570 |
Weighted average number of ordinary shares in computation of diluted earnings per share |  |  | 4,184,620 |  |  |  | 4,251,129 |  |  |  | 4,262,766 |

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- Definition The disclosure of earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 33 -IssueDate 2019-01-01 -Paragraph 66 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=33&code=ifrs-tx-2019-en-r&anchor=para_66&doctype=Standard -URIDate 2019-03-27 + Details
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