SUPPLEMENTAL UNAUDITED QUARTERLY FINANCIAL INFORMATION OF CONTINUING OPERATIONS (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								6 Months Ended	9 Months Ended		12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Quarterly Financial Data [Abstract]
Sales	$ 8,382	$ 7,575	$ 6,649	$ 5,629	$ 5,845	$ 3,672	$ 3,691	$ 3,397	$ 12,278	$ 19,853	$ 10,760	$ 28,235	$ 16,605	$ 10,234
Gross profit	5,563	5,294	4,674	3,563	3,556	2,521	2,537	2,212	$ 8,237	$ 13,531	7,270	19,094	10,826	6,958
Net Loss	$ (5,433)	$ (4,370)	$ (4,295)	$ (5,608)	$ (3,912)	$ (1,143)	$ (2,938)	$ (2,791)			$ (6,872)	(19,706)	(10,784)	(13,682)
Basic loss per common share (in USD per share)	$ (0.16)	$ (0.13)	$ (0.13)	$ (0.17)	$ (0.12)	$ (0.03)	$ (0.09)	$ (0.08)
Severance and related expense					$ 700							$ 0	$ 741	$ 1,524