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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
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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

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- 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 + Details
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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 + Details
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