EARNINGS PER SHARE - Narrative (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options to purchase (in shares)	5,104,288	3,878,632
Warrants to purchase (in shares)	8,633,188	7,353,056
Series B Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Convertible preferred stock, common stock issuable upon conversion (in shares)	3,941,704	3,713,794
Series B1 Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Convertible preferred stock, common stock issuable upon conversion (in shares)	7,109,305	10,264,001
Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Conversion of stock, shares issued (in shares)			419,859	419,859