PREFERRED STOCK AND DETACHABLE WARRANTS - Activity in Preferred Stock (Details) - USD ($)	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period			$ 22,179,963				$ 22,179,963
Plus: discount accretion	$ 550,774	$ 532,925	530,433	$ 515,698	$ 470,825	$ 457,853
Balance at end of period	28,897,014						28,897,014
Series B Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period			8,900,208			7,190,467	8,900,208	$ 7,190,467
Less: conversions of shares to common							0	(62,962)
Plus: discount accretion							1,031,483	815,373
Plus: dividends in kind	172,704			162,719			510,502	489,282
Balance at end of period	10,442,193			8,432,160			10,442,193	8,432,160
Series B1 Preferred Stock
Increase (Decrease) in Temporary Equity [Roll Forward]
Balance at beginning of period			$ 13,279,755			$ 15,769,478	13,279,755	15,769,478
Less: conversions of shares to common							(119,768)	(3,746,917)
Plus: discount accretion							582,649	629,003
Plus: dividends in kind	240,185			460,035			712,185	1,736,240
Balance at end of period	$ 14,454,821			$ 14,387,804			$ 14,454,821	$ 14,387,804