STOCK BASED COMPENSATION (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 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	1,136,213	1,870,400	1,136,213	1,870,400	1,273,088	1,779,613	2,273,323	2,673,512
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 9.28	$ 8.43	$ 9.28	$ 8.43	$ 9.29	$ 8.46	$ 7.89	$ 7.46
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value	$ 0	$ 1,059,282	$ 0	$ 1,059,282	$ 0	$ 50,869	$ 539,367	$ 5,485,248
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		336,360	66,188	618,110
Share-based Compensation Arrangements by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price		$ 4.86	$ 6.08	$ 4.31
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 854,271	$ 12,821	$ 2,198,143
Forfeited, Options	(136,875)	(66,563)	(577,212)	(185,002)
Share-based Compensation Arrangements by Share-based Payment Award, Options, Forfeitures in Period, Weighted Average Exercise Price	$ 9.42	$ 8.12	$ 7.14	$ 8.16
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Number	1,086,743	1,574,804	1,086,743	1,574,804
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Exercise Price	$ 9.36	$ 8.47	$ 9.36	$ 8.47
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	$ 0	$ 946,591	$ 0	$ 946,591
Stock based compensation expense	1,700,000	$ 2,300,000	6,300,000	$ 8,800,000
Unrecognized compensation expense	$ 12,391,000		$ 12,391,000
Weighted-average period			1 year 7 months 9 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