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Cash and Cash Equivalents - Summary of Cash and Cash Equivalents (Detail) $ in Thousands, $ in Thousands	Dec. 31, 2020 TWD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 TWD ($)
Cash and cash equivalents [abstract]
Cash on hand and petty cash	$ 470		$ 470
Checking accounts and demand deposits	2,609,421		915,134
Time deposits	1,503,760		3,788,480
Cash and cash equivalents	$ 4,113,651	$ 146,498	$ 4,704,084

X

- Definition

The amount of cash balances held at banks.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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X

- Definition

The amount of cash on hand and demand deposits, along with short-term, highly liquid investments that are readily convertible to known amounts of cash and that are subject to an insignificant risk of changes in value. [Refer: Cash; Cash equivalents]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- References

No definition available.

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- Definition

The amount of cash held by the entity. This does not include demand deposits.

+ References

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- Definition

A classification of cash equivalents representing short-term deposits. [Refer: Cash equivalents]

+ References

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