SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details)	9 Months Ended
	Sep. 30, 2015 USD ($) $ / shares shares
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	1,258,685
RSUs awarded	701,527
RSUs released	(394,130)
RSUs forfeited	(53,498)
RSUs ending	1,512,584
Weighted Average Purchase Price RSUs | $ / shares	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 3 months 18 days
Aggregate Intrinsic Value RSUs | $	$ 15,367,853
Number of RSUs vested and expected to vest	1,424,839
Weighted Average Purchase Price of RSUs vested and expected to vest | $ / shares	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest	1 year 2 months 12 days
Aggregate Intrinsic Value RSUs vested and expected to vest | $	$ 13,649,545
Number of RSUs exercisable	81,380
Weighted Average Purchase Price of RUSs exercisable | $ / shares	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable	0 years
Aggregate Intrinsic Value RSUs exercisable | $	$ 826,821
Weighted average remaining recognition period in years	2 years
Unamortized compensation expense, net of estimated forfeitures | $	$ 8,404,214