PREFERRED STOCK AND DETACHABLE WARRANTS - Activity in Preferred Stock (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Increase (Decrease) in Temporary Equity
Balance at beginning of period	$ 55,366,186
Plus: discount accretion	223,727	$ 932,003
Balance at end of period	48,130,860
Series B Preferred Stock
Increase (Decrease) in Temporary Equity
Balance at beginning of period	12,718,339	11,006,406
Less: conversions of shares to common	(1,978,494)	0
Less: exchanges of shares to common	(4,747,250)	0
Plus: discount accretion	0	413,889
Plus: dividends in kind	317,970	177,921
Balance at end of period	6,310,565	11,598,216
Series B1 Preferred Stock
Increase (Decrease) in Temporary Equity
Balance at beginning of period	11,036,173	12,743,047
Less: conversions of shares to common	(3,256,024)	(3,368,474)
Plus: discount accretion	223,727	518,114
Plus: dividends in kind	288,594	211,269
Balance at end of period	$ 8,292,470	$ 10,103,956