SELECTED QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 5,089,000	$ 3,474,000	$ 3,763,000	$ 3,773,000	$ 4,125,000	$ 4,418,000	$ 4,250,000	$ 3,985,000	$ 16,099,460	$ 16,777,713	$ 19,356,450
Gross profit	4,139,000	2,775,000	3,309,000	3,139,000	3,530,000	3,717,000	3,568,000	3,326,000	13,361,808	14,140,770	15,170,742
Net loss	$ (39,391,000)	$ (35,605,000)	$ (33,219,000)	$ (24,402,000)	$ (21,427,000)	$ (14,665,000)	$ (19,677,000)	$ (21,156,000)	$ (132,617,160)	$ (76,925,380)	$ (89,875,459)
Loss per common share, basic and diluted (in dollars per shares)	$ (0.17)	$ (0.16)	$ (0.15)	$ (0.11)	$ (0.10)	$ (0.07)	$ (0.10)	$ (0.11)	$ (0.59)	$ (0.37)	$ (0.46)