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Summary of Significant Accounting Policies - Convenience translation (Details)	Dec. 31, 2019
US$
Convenience translation rate (USD to RMB)	1.00
RMB
Convenience translation rate (USD to RMB)	6.9618

X

- 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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- Details

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X

- Details

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