NET LOSS PER COMMON SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Numerator:
Net loss	$ (2,388)	$ (3,044)	$ (12,166)	$ (6,694)
Dividends accumulated on convertible preferred stock	0	(1,856)	0	(3,660)
Net loss attributable to common shareholders	$ (2,388)	$ (4,900)	$ (12,166)	$ (10,354)
Denominator:
Weighted-average common shares outstanding (in shares)	32,765	22,684	32,333	22,644
Net loss per share attributable to common shareholders (basic and diluted) (in dollars per share)	$ (0.07)	$ (0.22)	$ (0.38)	$ (0.46)
Aggregate number of common equivalent shares (related to options, warrants and preferred stock) that have been excluded from computations of diluted net loss per common share (in shares)			5,500	6,400