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SHARE-BASED COMPENSATION - Share-based compensation for all share options (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
SHARE-BASED COMPENSATION |  |  |
Share based compensation expense | ¥ 54,281 | ¥ 51,359 | ¥ 9,921
Unrecognized compensation expense related to unvested share options | ¥ 137,361 |  |
Weighted-average period, compensation expense is expected to be recognized | 2 years 4 months 24 days |  |
General and administrative expenses |  |  |
SHARE-BASED COMPENSATION |  |  |
Share based compensation expense | ¥ 25,412 | 22,477 | 5,176
Selling and marketing expenses |  |  |
SHARE-BASED COMPENSATION |  |  |
Share based compensation expense | 24,772 | 23,561 | 3,674
Technology and content expenses |  |  |
SHARE-BASED COMPENSATION |  |  |
Share based compensation expense | ¥ 4,097 | ¥ 5,321 | ¥ 1,071

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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