GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Segment Reporting Information [Line Items]
Sales	$ 5,823	$ 3,397
Net income (loss) from continuing operations	(4,681)	(2,791)
Interest income	423	0
Interest expense	0	(34)
Other losses	(25)	0
Change in value of derivative liabilities	0	(26)
Income tax (benefit) expense	(124)	11
Operating Segments | Advanced Energy
Segment Reporting Information [Line Items]
Sales	4,371	2,629
Net income (loss) from continuing operations	(3,387)	(578)
Interest income	0
Interest expense		0
Other losses	0
Change in value of derivative liabilities		0
Income tax (benefit) expense	0	0
Operating Segments | OEM
Segment Reporting Information [Line Items]
Sales	1,452	768
Net income (loss) from continuing operations	785	406
Interest income	0
Interest expense		0
Other losses	0
Change in value of derivative liabilities		0
Income tax (benefit) expense	0	0
Corporate (Other)
Segment Reporting Information [Line Items]
Sales	0	0
Net income (loss) from continuing operations	(2,079)	(2,619)
Interest income	423
Interest expense		(34)
Other losses	(25)
Change in value of derivative liabilities		(26)
Income tax (benefit) expense	$ (124)	$ 11