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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Treasury Stock (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2019 USD ($) shares	Dec. 31, 2019 CNY (¥) shares	Dec. 31, 2018 shares
SUMMARY OF PRINCIPAL ACCOUNTING POLICIES
Treasury stock, shares	1,485,862	1,485,862	0
Repurchase of treasury stock value	$ 3,302	¥ 22,991

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Number of previously issued common shares repurchased by the issuing entity and held in treasury.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.30)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Topic 505
-SubTopic 30
-Section 45
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Amount allocated to previously issued common shares repurchased by the issuing entity and held in treasury.

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