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Income Taxes - Aggregate Amount and Per Share Effect of the Tax Holiday (Details) ¥ / shares in Units, $ / shares in Units, ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥) ¥ / shares	Dec. 31, 2021 USD ($) $ / shares	Dec. 31, 2020 CNY (¥) ¥ / shares	Dec. 31, 2019 CNY (¥) ¥ / shares
Income Taxes
Aggregate	¥ 16,422	$ 2,577	¥ 11,753	¥ 25,146
Per share effect-basic | (per share)	¥ 0.49	$ 0.08	¥ 0.38	¥ 0.82
Per share effect-diluted | (per share)	¥ 0.49	$ 0.08	¥ 0.38	¥ 0.81

X

- Definition

Income Tax Holiday Income Tax Benefits Per Share Basic

+ References

No definition available.

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- References

No definition available.

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X

- Definition

The amount of income taxes from which a reporting entity is exempt or for which it will receive a reduction in income taxes as a result of the income tax holiday granted by the taxing jurisdiction.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

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- Definition

Per share amount effect of the income tax benefit resulting from the income tax holidays granted by taxing jurisdictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB Topic 11.C)
-URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817

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