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PRINCIPAL ACCOUNTING POLICIES - Earnings/(loss) per share (Details)	Mar. 18, 2021
Treasury stock disclosures
Share subdivision ratio	8
After Share Subdivision
Treasury stock disclosures
Ratio of ADSs to ordinary shares	8
Before Share Subdivision
Treasury stock disclosures
Ratio of ADSs to ordinary shares	1

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- Definition

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+ References

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI https://asc.fasb.org/extlink&oid=120397183&loc=d3e187143-122770

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