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Income Tax - Summary of Current Tax Assets and Liabilities (Detail)
$ in Thousands, $ in Thousands
Dec. 31, 2020
TWD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
TWD ($)
Current tax assets      
Tax refund receivable $ 303,265 $ 10,800 $ 90,569
Prepaid income tax 399,555 14,229 462,523
Current tax assets 702,820 25,029 553,092
Current tax liabilities      
Income tax payable $ 6,514,502 $ 231,998 $ 4,858,578