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SUMMARY OF PRINCIPAL ACCOUNTING POLICIES - Selling and marketing expenses and Others (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Selling and marketing expenses |  |  |
Advertising expenses | ¥ 30,447 | ¥ 30,221 | ¥ 62,749
Government grants |  |  |
Government grants | ¥ 358 | ¥ 2,166 | ¥ 3,282
Value added taxes |  |  |
Minimum percentage value added tax | 0.00% |  |
Maximum percentage value added tax | 17.00% |  |

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- Definition Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 35 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848 + Details
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Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
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- Definition Represents financial award given by the federal, state or local government, which need not required to be repaid. + References No definition available. + Details
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Balance Type: | debit
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- References No definition available. + Details
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- Definition Maximum range of surcharges and value added tax ("VAT"). + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Minimum range of surcharges and value added tax ("VAT"). + References No definition available. + Details
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Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Value Added Taxes [Abstract] + References No definition available. + Details
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