EARNINGS PER SHARE - Narrative (Details) - shares	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Antidilutive Securities Excluded from Computation of Earnings Per Share
Options to purchase (in shares)	5,641,778	5,140,288
Warrants to purchase (in shares)	1,864,376	8,633,193
Series B Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Convertible preferred stock, common stock issuable upon conversion (in shares)	0	3,883,449
Series B1 Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Convertible preferred stock, common stock issuable upon conversion (in shares)	0	7,004,236
Series A Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share
Conversion of stock, shares issued (in shares)	391,602	419,859