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SHARE BASED COMPENSATION (Narrative) (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands					1 Months Ended	12 Months Ended
	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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Weighted average period over which unrecognized compensation is expected to be recognized for share based awards other than options, in ''PnYnMnDTnHnMnS'' format, for example, ''P1Y5M13D'' represents the reported fact of one year, five months, and thirteen days.

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