SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) $ / shares shares
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	2,074,794
RSUs awarded	27,818
RSUs released	(434,313)
RSUs forfeited	(1,625)
RSUs ending	1,666,674
Weighted Average Purchase Price RSUs | $ / shares	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 8 months 12 days
Aggregate Intrinsic Value RSUs | $	$ 23,833,438
Number of RSUs vested and expected to vest	1,666,674
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 | $	$ 23,134,454
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 | $	$ 698,984
Weighted average remaining recognition period in years	2 years 3 months 18 days
Unamortized compensation expense, net of estimated forfeitures | $	$ 11,504,932