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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Leases (Details) ¥ in Thousands, $ in Thousands | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥) | Jan. 01, 2019 CNY (¥)
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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES |  |  |
Operating lease right-of-use assets | $ 12,620 | ¥ 87,855 | ¥ 62,408
Lease liabilities |  | ¥ 88,030 | ¥ 61,037

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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