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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Convenience translation (Details)	Dec. 31, 2019
Convenience translation
Convenience translation rate (in RMB/USD)	6.9618

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- Definition

Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 830
-SubTopic 30
-Section S99
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6897108&loc=SL6897125-166521

+ Details

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Balance Type:	na
Period Type:	instant

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- References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	duration