NET LOSS PER COMMON SHARE (Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2019	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net loss	$ (882)	$ (662)	$ (2,438)	$ (2,692)	$ (1,462)	$ (1,433)	$ (3,669)	$ (6,564)	$ (6,674)	$ (13,128)	$ (12,288)
Denominator:
Weighted-average common shares outstanding (in shares)	29,590,000	29,569,000	29,488,000	29,070,000	28,935,000	28,910,000	28,835,000	28,455,000	29,429,540	28,783,830	28,156,382
Weighted-average common shares and share equivalents outstanding (in shares)	29,590,000	29,569,000	29,488,000	29,070,000	28,935,000	28,910,000	28,835,000	28,455,000	29,429,540	28,783,830	28,156,382
Net loss per common share:
Basic (USD per share)	$ (0.03)	$ (0.02)	$ (0.08)	$ (0.09)	$ (0.05)	$ (0.05)	$ (0.13)	$ (0.23)	$ (0.23)	$ (0.46)	$ (0.44)
Diluted (USD per share)	$ (0.03)	$ (0.02)	$ (0.08)	$ (0.09)	$ (0.05)	$ (0.05)	$ (0.13)	$ (0.23)	$ (0.23)	$ (0.46)	$ (0.44)