SHARE-BASED COMPENSATION - RSU Activity - Summary of Change (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Number of Restricted Stock Units [Roll Forward]
RSUs beginning	1,258,685
RSUs awarded	795,693	685,000	361,000
RSUs released	(406,463)	(410,000)	(547,000)
RSUs forfeited	(57,498)
RSUs ending	1,590,417	1,258,685
Weighted Average Purchase Price RSUs	$ 0
Weighted Average Remaining Contractual Term (Years) RSUs	1 year 1 month 6 days
Aggregate Intrinsic Value RSUs	$ 18,051,233
Number of RSUs vested and expected to vest	1,512,428
Weighted Average Purchase Price of RSUs vested and expected to vest	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs vested and expected to vest	1 year
Aggregate Intrinsic Value RSUs vested and expected to vest	$ 16,242,396
Number of RSUs exercisable	81,380
Weighted Average Purchase Price of RUSs exercisable	$ 0
Weighted Average Remaining Contractual Term (Years) of RUSs exercisable	0 years
Aggregate Intrinsic Value RSUs exercisable	$ 923,663
Weighted average remaining recognition period in years	1 year 9 months 18 days
Unamortized compensation expense, net of estimated forfeitures	$ 7,988,821