EARNINGS (LOSS) PER SHARE (Computation of basic and diluted earnings (loss) per share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings (loss) per share:
Earnings (loss) per share from continuing operations, basic and diluted	$ (0.06)	$ (0.03)	$ 0.04	$ (0.04)	$ 0.00	$ (0.06)	$ (0.10)	$ (0.10)	$ (0.09)	$ (0.27)	$ 0.05
Earnings (loss) per share from discontinued operations, basic and diluted	0.00	0.00	0.00	0.00	(0.01)	0.00	0.01	0.00	0.00	0.01	0.02
Earnings Per Share, Basic and Diluted	$ (0.06)	$ (0.03)	$ 0.04	$ (0.04)	$ (0.01)	$ (0.06)	$ (0.09)	$ (0.10)	$ (0.09)	$ (0.26)	$ 0.07
EPS numerator - basic and diluted:
Income (Loss) from Continuing Operations	$ (2,018)	$ (832)	$ 1,279	$ (1,349)	$ (108)	$ (1,908)	$ (3,347)	$ (3,570)	$ (2,920)	$ (8,933)	$ 1,607
Income (Loss) from Discontinued Operations, Net of Taxes	13	(16)	(53)	35	(184)	35	209	83	(21)	143	722
Net income (loss)	$ (2,005)	$ (848)	$ 1,226	$ (1,314)	$ (292)	$ (1,873)	$ (3,138)	$ (3,487)	$ (2,941)	$ (8,790)	$ 2,329
EPS denominator (in thousands):
Weighted-average common stock outstanding - basic (in shares)	32,063	32,151	32,048	32,161	32,227	33,572	33,252	34,631	32,106	33,174	33,869
Common stock equivalents: stock options and other stock-based awards (a) (in shares)									0	0	215
Weighted-average number of common stock outstanding - diluted (in shares)									32,106	33,174	34,084