NET LOSS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Numerator for basic and diluted loss per share:
Net loss	$ (3,482)	$ (2,390)	$ (9,351)	$ (7,668)
Preferred dividends	(949)	(553)	(2,437)	(1,575)
Preferred stock exchange	0	(1,245)	0	(1,245)
Net loss available to common shareholders	$ (4,431)	$ (4,188)	$ (11,788)	$ (10,488)
Net loss	$ (0.04)	$ (0.03)	$ (0.10)	$ (0.08)
Preferred dividends	(0.01)	(0.00)	(0.02)	(0.02)
Preferred stock exchange	0.00	(0.01)	0.00	(0.01)
Net loss available to common shareholders	$ (0.05)	$ (0.04)	$ (0.12)	$ (0.11)