SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details)	9 Months Ended
	Sep. 30, 2016 USD ($) $ / shares shares
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	1,590,417
RSUs awarded	1,116,585
RSUs released	(595,717)
RSUs forfeited	(24,075)
RSUs ending	2,087,210
Weighted Average Purchase Price RSUs | $ / shares	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 8 months 12 days
Aggregate Intrinsic Value RSUs | $	$ 26,976,147
Number of RSUs vested and expected to vest	1,908,169
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 8 months 12 days
Aggregate Intrinsic Value RSUs vested and expected to vest | $	$ 24,059,205
Number of RSUs exercisable	48,880
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 | $	$ 632,507
Weighted average remaining recognition period in years	2 years 4 months 24 days
Unamortized compensation expense, net of estimated forfeitures | $	$ 12,481,696