INCOME TAXES (Summary of Valuation Allowance) (Details) - CNY (¥) ¥ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2017 |
Dec. 31, 2016 |
Dec. 31, 2015 |
|
| Balance at the beginning of the year | ¥ 26,507 | ¥ 20,115 | ¥ 14,362 |
| Additions of valuation allowance | 15,868 | 13,076 | 9,069 |
| Reduction of valuation allowance | (5,429) | (6,684) | (3,316) |
| Balance at the end of the year | ¥ 36,946 | ¥ 26,507 | ¥ 20,115 |