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v3.20.1

Bonds Payable - Additional Information (Detail) $ / shares in Units, $ / shares in Units, $ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 TWD ($) | Aug. 31, 2017 TWD ($) $ / shares | Dec. 31, 2019 TWD ($) $ / shares | Dec. 31, 2019 TWD ($) $ / shares | Dec. 31, 2019 USD ($) | Dec. 31, 2018 TWD ($)
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds payable |  |  | $ 36,522,155 | $ 36,522,155 | $ 1,221,068 | $ 16,985,936
Unsecured Domestic Convertible Bonds [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds face amount |  | $ 100,000 |  |  |  |
Bonds maturity period |  | 3 years |  |  |  |
Unsecured domestic bonds conversion price | $ / shares |  | $ 3 |  |  |  |
Annual interest rates of bonds |  | 3.50% |  |  |  |
Secured Domestic Convertible Bonds [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds face amount | $ 250,000 |  |  |  |  |
Bonds maturity period | 3 years |  |  |  |  |
Secured domestic bonds conversion price | (per share) |  |  | $ 4.8 | $ 0.2 |  |
Bonds redemption description | (1) if the closing price of AMPI's ordinary shares on the Taipei Exchange exceeds the conversion price by 30% or more for 30 consecutive business days after 3 months from the offering date and prior to 40 days before the maturity or (2) the outstanding amount of the bonds falls below 10% of the originally offered after 3 months from the offering date and prior to 40 days before the maturity. |  |  |  |  |
Senior Unsecured International Corporate Bonds [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds face amount |  |  |  |  | 1,000 |
Bonds payable |  |  |  |  | 300,000 |
Senior Unsecured International Corporate Bonds [Member] | Tranche A [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds payable |  |  |  |  | $ 200,000 |
Borrowings maturity |  |  | 3 years | 3 years |  |
Annual interest rates of bonds |  |  | 2.15% | 2.15% | 2.15% |
Senior Unsecured International Corporate Bonds [Member] | Tranche B [Member] |  |  |  |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |  |  |  |
Bonds payable |  |  |  |  | $ 100,000 |
Borrowings maturity |  |  | 5 years | 5 years |  |
Annual interest rates of bonds |  |  | 2.50% | 2.50% | 2.50% |

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