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SHARE BASED COMPENSATION (Narrative) (Details) ¥ / shares in Units, ¥ in Thousands |  |  |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Oct. 14, 2014 $ / shares shares | Jun. 01, 2010 shares | Feb. 04, 2005 shares | Dec. 21, 2018 shares | Nov. 22, 2018 $ / shares shares | May 18, 2015 shares | Dec. 31, 2018 CNY (¥) ¥ / shares shares | Dec. 31, 2017 CNY (¥) ¥ / shares shares | Dec. 31, 2016 CNY (¥) shares | Nov. 14, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based compensation expenses | ¥ |  |  |  |  |  |  | ¥ 8,121 | ¥ 4,640 | ¥ 7,828 |
Unrecognized share-based compensation expenses | ¥ |  |  |  |  |  |  | ¥ 4,650 | ¥ 3,575 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number |  |  |  |  | 293,059 |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price | $ / shares |  |  |  |  | $ 0.4749 |  |  |  |  |
Restricted stock [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for grant |  |  |  |  | 200,000 |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 493,059 | 0 |  |
Denominator used to determine number of shares of restricted stock subject to each award | $ / shares | $ 200 |  |  |  |  |  |  |  |  |
Share price (in dollars per share) | $ / shares | $ 1.480 |  |  |  |  |  |  |  |  |
Awards vested |  |  |  |  | 0 |  |  | 15,027 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | (per share) |  |  |  |  | $ 2.70 |  | ¥ 18.56 | ¥ 0 |  |
Restricted stock [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 86,473 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage |  |  |  |  | 25.00% |  |  |  |  |
Restricted stock [Member] | Employees and new hires [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  | 510,000 | 116,291 | 127,500 |  |
Awards vested | 811,359 |  |  |  |  |  | 116,291 | 122,353 |  |
Share Incentive Plan 2005 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for grant |  |  | 50,000 |  |  |  |  |  |  | 676,078
Expiration term |  |  | 10 years |  |  |  |  |  |  |
Vesting period |  |  | 4 years |  |  |  |  |  |  |
Automatic termination period of the plan |  |  | 10 years |  |  |  |  |  |  |
Share Incentive Plan 2005 [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of voting interest to be held by an individual to be eligible for designation as an optionee or purchaser |  |  | 10.00% |  |  |  |  |  |  |
Exercise price per share granted to a 10% stockholder relative to fair market value per share on the grant date (as a percent) |  |  | 110.00% |  |  |  |  |  |  |
Purchase price per share granted to a 10% stockholder relative to fair market value per share on the grant date (as a percent) |  |  | 100.00% |  |  |  |  |  |  |
Equity Incentive Plan 2010 [Member] | Common Class A [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for grant |  | 633,333 |  |  |  |  |  |  |  |
Annual increase in shares authorized on the first day of each fiscal year |  | 833,333 |  |  |  |  |  |  |  |
Annual increase in shares authorized on the first day of each fiscal year (as a percent) |  | 5.00% |  |  |  |  |  |  |  |
Equity Incentive Plan 2010 [Member] | Common Class A [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Number of shares to be added to the 2010 Plan from the 2005 Plan |  | 333,333 |  |  |  |  |  |  |  |
Equity Incentive Plan 2010 [Member] | Common Class A [Member] | Employees [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  |  |  |  |  | 19,935 |
Equity Incentive Plan 2010 [Member] | Incentive Shares Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Expiration term |  | 10 years |  |  |  |  |  |  |  |
Equity Incentive Plan 2010 [Member] | Incentive Shares Option [Member] | Employees [Member] | Minimum [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Percentage of voting interest to be held by an individual to be eligible for designation as an optionee or purchaser |  | 10.00% |  |  |  |  |  |  |  |
Exercise price per share granted to a 10% stockholder relative to fair market value per share on the grant date (as a percent) |  | 110.00% |  |  |  |  |  |  |  |
Expiration term |  | 5 years |  |  |  |  |  |  |  |
Amended and Restated Equity Incentive Plan 2010 [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |
Shares authorized for grant |  |  |  | 6,500,000 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized |  |  |  | 293,059 | 293,059 |  |  |  |  |
Sharebased Compensation Arrangement by Sharebased Payment Award Description of Number of Shares Available for Issuance |  |  |  | The number of shares available for issuance under the Amended and Restated 2010 Plan will be increased on the closing day of each future registration (including closing of over-allotment options) during the next two fiscal years ending December 31, 2020, in an amount equal to fifteen percent (15%) of the shares offered in each registration. |  |  |  |  |  |

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