EARNINGS PER SHARE -Narrative (Details) - shares	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Options to purchase (in shares)	3,460,750	3,180,417
Warrants to purchase (in shares)	7,353,056	7,353,056
Preferred stock, shares outstanding	0	31,568
Series B Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of stock, common shares issued if converted (in shares)	3,604,827	3,427,597
Series B1 Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of stock, common shares issued if converted (in shares)	10,057,597	13,151,989
Series A Preferred
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of stock, common shares issued if converted (in shares)	419,859	453,567
Series C Preferred
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Conversion of stock, common shares issued if converted (in shares)	0	3,156,800