PREFERRED STOCK AND DETACHABLE WARRANTS - Activity in Preferred Stock (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period	$ 28,146,347
Plus: discount accretion	932,003	$ 560,675
Balance at end of period	48,527,641
Series B Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period	11,006,406	8,900,208
Plus: discount accretion	413,889	322,671
Plus: dividends in kind	177,921	167,642
Balance at end of period	11,598,216	9,390,521
Series B1 Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period	12,743,047	13,279,755
Less: conversions of shares to common	(3,368,474)	(150,010)
Plus: discount accretion	518,114	238,004
Plus: dividends in kind	211,269	235,360
Balance at end of period	$ 10,103,956	$ 13,603,109