STOCK BASED COMPENSATION (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock Options
Outstanding, beginning - shares	3,060,834	2,939,167	3,073,334
Options granted - shares	325,000	711,667	225,000
Options exercised - shares	(637,750)	(405,000)	(65,000)
Options cancelled/forfeited/expired - shares	(99,501)	(185,000)	(294,167)
Outstanding, ending - shares	2,648,583	3,060,834	2,939,167	3,073,334
Vested - shares	1,820,480	2,268,334	2,283,237
Exercisable - shares	1,820,480	2,268,334	2,283,237
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward]
Outstanding, beginning - weighted average exercise price (in USD per share)	$ 5.89	$ 5.70	$ 5.46
Options granted - weighted average exercise price (in USD per share)	$ 7.61	$ 2.46	$ 1.91
Options exercised - weighted average exercise price (in USD per share)	$ (0.88)	$ (1.19)	$ (1.47)
Options cancelled/forfeited/expired - weighted average exercise price (in USD per share)	$ (12.17)	$ (0.68)	$ (1.21)
Outstanding, ending - weighted average exercise price (in USD per share)	$ 7.07	$ 5.89	$ 5.70	$ 5.46
Vested - weighted average exercise price (in USD per share)	$ 8.27	$ 6.97	$ 6.89
Exercisable - weighted average exercise price (in USD per share)	$ 8.27	$ 6.97	$ 6.89
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Outstanding, beginning - weighted average remaining contractual life (in years)	5 years 9 months 21 days	6 years 0 months 25 days	6 years 6 months	7 years
Options granted - weighted average remaining contractual life (in years)	9 years 8 months 8 days	8 years 9 months 10 days	10 years
Outstanding, ending - weighted average remaining contractual life (in years)	5 years 9 months 21 days	6 years 0 months 25 days	6 years 6 months	7 years
Vested - weighted average remaining contractual life (in years)	4 years 7 months 20 days	5 years 2 months 12 days	6 years 4 months 27 days
Exercisable - weighted average remaining contractual life (in years)	4 years 7 months 20 days	5 years 2 months 12 days	6 years 4 months 27 days
Outstanding, beginning - grant date fair value	$ 1,327,163	$ 1,144,024	$ 990,995
Options granted - grant date fair value	622,272	420,796	197,146
Options exercised - grant date fair value	(264,990)	(89,080)	(5,239)
Options cancelled/forfeited/expired - grant date fair value	(29,804)	(148,577)	(38,878)
Outstanding, ending - grant date fair value	1,654,641	1,327,163	1,144,024	990,995
Vested - grant date fair value	654,948	722,143	709,902
Exercisable - grant date fair value	$ 654,948	$ 722,143	$ 709,902