STOCKHOLDERS' EQUITY (Details 3) - Stock Options [Member] - USD ($)	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Options, Outstanding
Options outstanding at December 31, 2016	21,767,854
Options Granted	2,271,500
Options Exercised	(102,546)
Options Expired	(108,375)
Options Cancelled/Forfeited	(463,208)
Options outstanding at December 31, 2017	23,365,225	21,767,854
Vested and Exercisable at December 31, 2017	19,770,142
Unvested at December 31, 2017	3,595,083
Options, Weighted Average Exercise Price
Options outstanding at December 31, 2016	$ 3.56
Granted	6.60
Exercised	2.07
Expired	7.64
Cancelled/Forfeited	6.28
Options outstanding at December 31, 2017	3.78	$ 3.56
Vested and Exercisable at December 31, 2017	3.27
Unvested at December 31, 2017	$ 6.60
Options, Weighted Average Remaining Contractual Life
Options outstanding	5 years 1 month 16 days	5 years 9 months 18 days
Vested and Exercisable	4 years 5 months 20 days
Unvested	8 years 9 months 14 days
Options outstanding, Aggregate Intrinsic Value
Options outstanding at December 31, 2016	$ 60,495,730
Options exercised	452,287	$ 3,828,358	$ 3,186,371
Options outstanding at December 31, 2017	64,664,821	$ 60,495,730
Vested and Exercisable at December 31, 2017	63,895,512
Unvested at December 31, 2017	$ 769,309