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Financial Statements Schedule: Valuation and Qualifying Accounts (Tables) | 12 Months Ended
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Dec. 31, 2021
Text block [abstract] |
Disclosure Of Details Of Valuation And Qualifying Accounts |
|  | January 1 |  |  | Additions charged to expense or deduction of revenue |  |  | Deduction / Write-offs / Reversal |  |  | December 31 |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |
Year of 2019 : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for impairment of property, plant and equipment |  |  | 317,593 |  |  |  | 9,938 |  |  |  | (134,191 | ) |  |  | 193,340 |
Allowance for impairment of obsolescence and decline in market value of inventories |  |  | 36,157 |  |  |  | 27,341 |  |  |  | — |  |  |  | 63,498 |
Provision for deficiency compensation |  |  | 29,352 |  |  |  | 5,204 |  |  |  | (32,558 | ) |  |  | 1,998 |
Sales for allowance |  |  | 32,627 |  |  |  | 63,863 |  |  |  | (70,490 | ) |  |  | 26,000 |
Year of 2020 : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for impairment of property, plant and equipment |  |  | 193,340 |  |  |  | — |  |  |  | (11,338 | ) |  |  | 182,002 |
Allowance for impairment of obsolescence and decline in market value of inventories |  |  | 63,498 |  |  |  | 16,317 |  |  |  | — |  |  |  | 79,815 |
Provision for deficiency compensation |  |  | 1,998 |  |  |  | 4,358 |  |  |  | (2,893 | ) |  |  | 3,463 |
Sales for allowance |  |  | 26,000 |  |  |  | 21,916 |  |  |  | (38,052 | ) |  |  | 9,864 |
|  | January 1 |  |  | Additions charged to expense or deduction of revenue |  |  | Deduction / Write-offs / Reversal |  |  | December 31 |
|  | NT$000 |  |  | NT$000 |  |  | NT$000 |  |  | NT$000 |
Year of 2021 : |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allowance for impairment of property, plant and equipment |  |  | 182,002 |  |  |  | 4,843 |  |  |  | (3,666 | ) |  |  | 183,179 |
Allowance for impairment of obsolescence and decline in market value of inventories |  |  | 79,815 |  |  |  | 41,771 |  |  |  | — |  |  |  | 121,586 |
Provision for deficiency compensation |  |  | 3,463 |  |  |  | 11,898 |  |  |  | (11,080 | ) |  |  | 4,281 |
Sales for allowance |  |  | 9,864 |  |  |  | 34,744 |  |  |  | (34,759 | ) |  |  | 9,849 |
For movements in loss allowance for contract assets, accounts receivable, and other receivables, please refer to Note 43.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 + Details
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