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GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |
Sales | $ 9,799 | $ 9,295 | $ 18,188 | $ 17,070
Income (loss) from operations | (1,306) | (510) | (3,043) | (2,503)
Interest expense, net | (36) | (50) | (67) | (88)
Change in fair value of derivative liabilities | 38 | 41 | 126 | 128
Income tax expense | 4 | 0 | 9 | 0
Depreciation and amortization | 178 | 173 | 356 | 355
Operating Segments | Core |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 7,488 | 6,881 | 14,263 | 13,359
Income (loss) from operations | 2,710 | 1,836 | 5,023 | 2,958
Interest expense, net | 0 | 0 | 0 | 0
Change in fair value of derivative liabilities | 0 | 0 | 0 | 0
Income tax expense | 0 | 0 | 0 | 0
Depreciation and amortization |  | 0 | 0 | 0
Operating Segments | OEM |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 498 | 1,648 | 1,505 | 2,589
Income (loss) from operations | 205 | 1,151 | 708 | 1,808
Interest expense, net | 0 | 0 | 0 | 0
Change in fair value of derivative liabilities | 0 | 0 | 0 | 0
Income tax expense | 0 | 0 | 0 | 0
Depreciation and amortization |  | 0 | 0 | 0
Operating Segments | Advanced Energy |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 1,813 | 766 | 2,420 | 1,122
Income (loss) from operations | (1,250) | (1,090) | (2,971) | (2,624)
Interest expense, net | 0 | 0 | 0 | 0
Change in fair value of derivative liabilities | 0 | 0 | 0 | 0
Income tax expense | 0 | 0 | 0 | 0
Depreciation and amortization |  | 0 | 0 | 0
Corporate (Other) |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Sales | 0 | 0 | 0 | 0
Income (loss) from operations | (2,971) | (2,407) | (5,803) | (4,645)
Interest expense, net | (36) | (50) | (67) | (88)
Change in fair value of derivative liabilities | 38 | 41 | 126 | 128
Income tax expense | 4 | 0 | 9 | 0
Depreciation and amortization | $ 178 | $ 173 | $ 356 | $ 355

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