GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Segment Reporting Information [Line Items]
Sales	$ 8,389	$ 7,775
Income (loss) from operations	(1,737)	(1,993)
Interest expense, net	(31)	(38)
Change in fair value of derivative liabilities, net	88	87
Income tax expense	5	0
Depreciation and amortization	178	182
Operating Segments | Core
Segment Reporting Information [Line Items]
Sales	6,775	6,478
Income (loss) from operations	2,313	1,122
Interest expense, net	0	0
Change in fair value of derivative liabilities, net	0	0
Income tax expense	0	0
Depreciation and amortization	0	0
Operating Segments | OEM
Segment Reporting Information [Line Items]
Sales	1,007	941
Income (loss) from operations	503	657
Interest expense, net	0	0
Change in fair value of derivative liabilities, net	0	0
Income tax expense	0	0
Depreciation and amortization	0	0
Operating Segments | Advanced Energy
Segment Reporting Information [Line Items]
Sales	607	356
Income (loss) from operations	(1,721)	(1,534)
Interest expense, net	0	0
Change in fair value of derivative liabilities, net	0	0
Income tax expense	0	0
Depreciation and amortization	0	0
Corporate (Other)
Segment Reporting Information [Line Items]
Sales	0	0
Income (loss) from operations	(2,832)	(2,238)
Interest expense, net	(31)	(38)
Change in fair value of derivative liabilities, net	88	87
Income tax expense	5	0
Depreciation and amortization	$ 178	$ 182