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GEOGRAPHIC AND SEGMENT INFORMATION - REPORTABLE SEGMENT (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales | $ 9,347 |  | $ 10,063 | $ 27,535 |  | $ 27,133
Income (loss) from operations (1) | (1,134) |  | (245) | (4,177) |  | (2,748)
Interest expense, net | (36) |  | (37) | (103) |  | (125)
Change in fair value of derivative liabilities | (69) |  | (683) | 57 |  | (555)
Income tax expense | 6 |  | 0 | 15 |  | 0
Depreciation and amortization | 171 |  | 201 | 527 |  | 556
Operating Segments | Core |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales | 6,696 |  | 6,902 | 20,959 |  | 20,261
Income (loss) from operations (1) | 1,699 | [1] | 2,089 | 6,471 | [1] | 5,047
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 |  | 0
Operating Segments | OEM |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales | 525 |  | 1,762 | 2,030 |  | 4,351
Income (loss) from operations (1) | 323 | [1] | 690 | 1,031 | [1] | 2,498
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 |  | 0
Operating Segments | Advanced Energy |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales | 2,126 |  | 1,399 | 4,546 |  | 2,521
Income (loss) from operations (1) | (718) |  | (707) | (3,821) |  | (3,331)
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 |  | 0
Corporate (Other) |  |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |  |
Sales | 0 |  | 0 | 0 |  | 0
Income (loss) from operations (1) | (2,438) | [1] | (2,317) | (7,858) | [1] | (6,962)
Interest expense, net | (36) |  | (37) | (103) |  | (125)
Change in fair value of derivative liabilities | (69) |  | (683) | 57 |  | (555)
Income tax expense | 6 |  | 0 | 15 |  | 0
Depreciation and amortization | $ 171 |  | $ 201 | $ 527 |  | $ 355
[1] | During the first and second quarter of 2017, marketing expenses were considered as attributable only to the Corporate (Other) segment in the line Income (loss) from operations. Beginning with the third quarter of 2017, it was determined that certain marketing expenses are attributable to specific segments. The disclosure of Income (loss) from operations was updated for the third quarter of 2017 to reflect marketing expense by segment.

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