PREFERRED STOCK AND TEMPORARY EQUITY PREFERRED STOCK AND TEMPORARY EQUITY (Details 1) - shares		1 Months Ended	12 Months Ended
	May 13, 2016	May 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Jun. 24, 2015	Jun. 19, 2015
Series A Preferred
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding			453,567	492,716
Series B Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding			3,427,597	3,229,409
Stock repurchased and retired during period (in shares)	3,575,070	3,575,070	3,575,070	3,575,070
Conversion of Series B preferred stock into common stock (in shares)			1,739,272	1,739,272
Series B-1 Preferred Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding			13,151,989	12,282,638
Series C Preferred
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Preferred stock, shares outstanding			31,568	31,568
Warrants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares called by each warrant (in shares)	0.25				0.5	0.5