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SHARE BASED COMPENSATION (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended |  |  |  |  |  |  |  |
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Apr. 03, 2016 $ / shares shares | Apr. 03, 2015 USD ($) shares | Nov. 11, 2014 shares | Apr. 03, 2014 USD ($) $ / shares shares | Sep. 16, 2016 | Dec. 31, 2016 CNY (¥) shares | Dec. 31, 2015 CNY (¥) shares | Dec. 31, 2014 CNY (¥) shares | Dec. 31, 2013 shares | Dec. 31, 2011 $ / shares shares | Dec. 31, 2016 $ / shares | Dec. 31, 2015 $ / shares | Dec. 31, 2014 $ / shares shares | Sep. 16, 2013 $ / shares | Jan. 31, 2013 $ / shares | Jan. 01, 2013 $ / shares | Nov. 28, 2012 shares | Sep. 22, 2008 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  | 1,115,807 | 615,624 | 1,805,784 |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  | 10 years |  | 10 years |  |  |  |  |  |  |  |  |  |  |
Total intrinsic value of options exercised | ¥ |  |  |  |  |  | ¥ 141,040 | ¥ 235,831 | ¥ 153,860 |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.60 |  |  |  |  |
Non-vested shares granted |  |  |  |  |  | 20,000 | 25,000 | 29,724 |  |  |  |  |  |  |  |  |  |
Non-vested shares granted, aggregate value | $ |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock option compensation expense | ¥ |  |  |  |  |  | ¥ 71,282 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized stock option compensation expense, period for recognition |  |  |  |  |  | 2 years 2 months 5 days |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized non-vested shares compensation expense | ¥ |  |  |  |  |  | ¥ 244 |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized non-vested shares compensation expense, period for recognition |  |  |  |  |  | 3 months |  |  |  |  |  |  |  |  |  |  |  |
Fair value of vested restricted shares | ¥ |  |  |  |  |  | ¥ 2,316 | ¥ 1,567 |  |  |  |  |  |  |  |  |  |  |
Director [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested shares granted | 20,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise prices | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.058 | $ 0.89 |  |  |  |  |  |
Vesting period |  |  |  |  |  | 6 months | 1 year |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  | 9.99 | 9.28 |  |  |  | $ 3.75 |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise prices | $ / shares |  |  |  |  |  |  |  |  |  |  | 4.36 | 4.36 |  |  |  |  |  |
Vesting period |  |  |  |  |  | 4 years | 4 years |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 16.54 | $ 12.85 |  | $ 5.69 |  |  |  |
January 1 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  | 2,029,386 | 124,000 |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years | 5 years |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  | 10 years | 10 years |  |  |  |  |  |  |  |
Fair Value of Ordinary Share by Valuation | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.63 |  |  |  |  | $ 3.75 |  |  |
February 20 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  | 1,805,784 |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |  |
Fair Value of Ordinary Share by Valuation | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 8.60 |  |  |  |  |
April 3 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share price | $ / shares | $ 0 |  |  | $ 9 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested shares granted | 20,000 | 25,000 |  | 27,780 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested shares granted, aggregate value | $ |  | $ 250 |  | $ 250 |  |  |  |  |  |  |  |  |  |  |  |  |  |
September 16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  | 30,000 |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
September 16 [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
September 16 [Member] | Remaining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |
September 16, Second Issuance [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  | 458,424 |  |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |  |
Fair Value of Ordinary Share by Valuation | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 5.69 |  |  |  |
September 16, Second Issuance [Member] | IPO [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |  |  |
September 16, Second Issuance [Member] | Remaining [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |  |  |
Vesting percentage |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |  |  |
September 26 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Options granted |  |  |  |  |  |  |  |  |  | 1,533,020 |  |  |  |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |  |  |
Fair Value of Ordinary Share by Valuation | $ / shares |  |  |  |  |  |  |  |  |  | $ 0.83 |  |  |  |  |  |  |  |
November 11 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Non-vested shares granted |  |  | 1,944 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
2008 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,184,990 | 6,002,020
2014 Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Authorized |  |  |  |  |  |  |  |  |  |  |  |  | 1,833,696 |  |  |  |  |

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