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GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Sales $ 5,926,000 $ 3,672,000 $ 3,691,000 $ 3,397,000 $ 3,658,000 $ 2,651,000 $ 2,311,000 $ 1,614,000 $ 16,686,000 $ 10,234,000 $ 8,819,000
Income (loss) from operations                 (13,600,000) (13,885,000) (11,392,000)
Severance and related expense $ 700,000       $ 1,500,000       741,000 1,524,000 0
Interest income                 616,000 0 0
Interest expense                 (104,000) (136,000) (158,000)
Income tax (benefit) expense                 (3,777,000) (156,000) 64,000
Operating Segments | OEM                      
Segment Reporting Information [Line Items]                      
Sales                 3,618,000 2,598,000 5,328,000
Income (loss) from operations                 1,795,000 1,353,000 3,045,000
Severance and related expense                 0 0 0
Interest income                 0 0 0
Interest expense                 0 0 0
Income tax (benefit) expense                 0 0 0
Operating Segments | Advanced Energy                      
Segment Reporting Information [Line Items]                      
Sales                 13,068,000 7,636,000 3,491,000
Income (loss) from operations                 (6,326,000) (3,957,000) (4,812,000)
Severance and related expense                 0 0 0
Interest income                 0 0 0
Interest expense                 0 0 0
Income tax (benefit) expense                 0 0 0
Corporate (Other)                      
Segment Reporting Information [Line Items]                      
Sales                 0 0 0
Income (loss) from operations                 (9,069,000) (11,281,000) (9,625,000)
Severance and related expense                 741,000 1,524,000 0
Interest income                 616,000 0 0
Interest expense                 104,000 136,000 (158,000)
Income tax (benefit) expense                 $ (3,777,000) $ (156,000) $ 64,000