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SHARE BASED COMPENSATION (Tables)

12 Months Ended

Dec. 31, 2016

SHARE BASED COMPENSATION [Abstract]

Summary of Stock Option Activity

								Weighted
					Weighted			Average
		Number of			Average			Remaining			Aggregate
		Share			Exercise Price			Contractual			Intrinsic
		Options			US$			Years			Value US$
Outstanding at December 31, 2013			8,134,830			0.82
Granted			1,805,784			3.05
Exercised			(1,786,449)			0.14
Forfeited			(115,215)			2.91
Expired			—			—
Outstanding at December 31, 2014			8,038,950			1.44			6.19			77,658
Granted			615,624			3.38
Exercised			(3,015,872)			1.20
Forfeited			(56,926)			3.33
Expired			—			—
Outstanding at December 31, 2015			5,581,776			1.77			5.68			48,412
Granted			1,115,807			1.90
Exercised			(2,106,043)			1.46
Forfeited			(263,671)			2.98
Expired			—			—
Outstanding at December 31, 2016			4,327,869			1.88			5.84			56,743
Vested and expected to vest as of December 31, 2016			3,959,763			1.74			5.59			52,460
Exercisable as of December 31, 2016			2,536,418			1.17			4.09			35,045

Summary of Fair Value Assumptions

		Year Ended December 31,
		2014			2015			2016
		US$			US$			US$
Expected volatility			51.7%			62.3%-70.9%			63.5%-68.8%
Expected dividends yield			0%			0%			0%
Exercise multiple			2.2			2.0			2.0
Risk-free interest rate per annum			3.81%			2.68%-2.99%			2.15%-3.18%
Estimated fair value of underlying ordinary shares (per share)			US$8.60			US$9.28-US$12.85			US$9.99-US$16.54

Schedule of Fair Values of the Options Granted

		Year Ended December 31,
		2014			2015			2016
		US$			US$			US$
Weighted average grant date fair value of option per share			6.35			9.16			10.17
Aggregate grant date fair value of options			11,468			5,641			11,352

Summary of Non-vested Shares Activity

					Weighted Average
		Number of Non-			Grant Date Fair
		vested Shares			Value
					US$
Outstanding as of December 31, 2013			-			-
Granted			29,724			9.38
Vested			(1,944)			13.95
Forfeited			-			-
Outstanding as of December 31, 2014			27,780			9.06
Granted			25,000			9.63
Vested			(27,780)			9.06
Forfeited			-			-
Outstanding as of December 31, 2015			25,000			9.63
Granted			20,000			10.82
Vested			(35,000)			9.97
Forfeited			-			-
Outstanding as of December 31, 2016			10,000			10.82

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Tabular disclosure of the changes in outstanding nonvested restricted stock shares.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
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Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (f)(2)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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Tabular disclosure of the weighted-average grant-date fair value of equity options or other equity instruments granted during the year.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (d)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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