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Significant Accounting Policies (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Significant Accounting Policies
Minimum period for maturity dates for short-term investments	90 days	90 days

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- Definition

Minimum period for maturity dates relating to short-term investments, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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