PREFERRED STOCK AND DETACHABLE WARRANTS - Activity in Preferred Stock (Details) - USD ($)	3 Months Ended				6 Months Ended
	Jun. 30, 2020	Mar. 31, 2020	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Increase (Decrease) in Temporary Equity
Balance at beginning of period		$ 28,146,347			$ 28,146,347
Plus: discount accretion	$ 539,235	932,003	$ 532,925	$ 560,675
Balance at end of period	50,920,307				50,920,307
Series B Preferred Stock
Increase (Decrease) in Temporary Equity
Balance at beginning of period		11,006,406		8,900,208	11,006,406	$ 8,900,208
Plus: discount accretion					854,364	666,048
Plus: dividends in kind	180,591		167,642		358,512	337,798
Balance at end of period	12,219,282		9,904,054		12,219,282	9,904,054
Series B1 Preferred Stock
Increase (Decrease) in Temporary Equity
Balance at beginning of period		$ 12,743,047		$ 13,279,755	12,743,047	13,279,755
Less: conversions of shares to common					(3,368,474)	(119,768)
Plus: discount accretion					616,874	472,000
Plus: dividends in kind	163,908		235,360		375,177	397,310
Balance at end of period	$ 10,366,624		$ 14,029,297		$ 10,366,624	$ 14,029,297