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GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($) $ 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
Segment Reporting Information [Line Items]
Sales	$ 11,348	$ 9,347	$ 9,799	$ 8,389	$ 9,494	$ 10,063	$ 9,295	$ 7,775	$ 38,883	$ 36,627	$ 29,520
Income (loss) from operations									(5,265)	(3,792)	(6,986)
Severance and related expense	$ 1,524								1,524	0	0
Interest expense, net									(136)	(158)	(158)
Change in fair value of derivative liabilities									183	64	1,799
Income tax (benefit) expense									(156)	64	25
Depreciation and amortization									696	734	812
Operating Segments \| Core
Segment Reporting Information [Line Items]
Sales									28,649	27,808	26,098
Income (loss) from operations									8,620	7,600	5,690
Severance and related expense									0	0	0
Interest expense, net									0	0	0
Change in fair value of derivative liabilities									0	0	0
Income tax (benefit) expense									0	0	0
Depreciation and amortization									0	0	0
Operating Segments \| OEM
Segment Reporting Information [Line Items]
Sales									2,598	5,328	2,116
Income (loss) from operations									1,353	3,045	1,524
Severance and related expense									0	0	0
Interest expense, net									0	0	0
Change in fair value of derivative liabilities									0	0	0
Income tax (benefit) expense									0	0	0
Depreciation and amortization									0	0	0
Operating Segments \| Advanced Energy
Segment Reporting Information [Line Items]
Sales									7,636	3,491	1,306
Income (loss) from operations									(3,957)	(4,812)	(4,688)
Severance and related expense									0	0	0
Interest expense, net									0	0	0
Change in fair value of derivative liabilities									0	0	0
Income tax (benefit) expense									0	0	0
Depreciation and amortization									0	0	0
Corporate (Other)
Segment Reporting Information [Line Items]
Sales									0	0	0
Income (loss) from operations									(11,281)	(9,625)	(9,512)
Severance and related expense									1,524	0	0
Interest expense, net									(136)	(158)	(158)
Change in fair value of derivative liabilities									183	64	1,799
Income tax (benefit) expense									(156)	64	25
Depreciation and amortization									$ 696	$ 734	$ 812