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SHARE-BASED COMPENSATION - Share-based compensation for all share options (Details) - CNY (¥) ¥ in Thousands	12 Months Ended
	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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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-Publisher FASB
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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.

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Amount of cost to be recognized for option under share-based payment arrangement.

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