STOCK BASED COMPENSATION (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Mar. 31, 2017	Dec. 31, 2016	Mar. 31, 2016	Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	1,273,088	2,273,323	1,273,088	2,273,323	1,350,182	1,779,613	2,363,699	2,673,512
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 9.29	$ 7.89	$ 9.29	$ 7.89	$ 9.18	$ 8.46	$ 7.91	$ 7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0	$ 539,367	$ 0	$ 539,367	$ 0	$ 50,869	$ 2,326,963	$ 5,485,248
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period			66,188	281,750
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price			$ 6.08	$ 3.65
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value			$ 12,821	$ 1,343,872
Forfeited, Options	(77,094)	(90,376)	(440,337)	(118,439)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 7.35	$ 8.30	$ 6.43	$ 8.18
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,177,054	1,858,163	1,177,054	1,858,163
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 9.41	$ 7.81	$ 9.41	$ 7.81
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value		$ 539,367		$ 539,367
Stock based compensation expense	$ 2,100,000	$ 2,800,000	$ 4,600,000	$ 6,400,000
Unrecognized compensation expense	$ 15,636,000		$ 15,636,000
Weighted-average period			1 year 8 months 12 days
Restricted Stock Units (RSUs) [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number			130,375
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Accelerated Vesting, Number			24,001