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INCOME TAXES - EFFECTIVE TAX RATE (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 30, 2018 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Income tax (benefit) expense |  | $ (2,408) | $ 6 | $ (2,384) | $ 15
Effective income tax rate, percent (as a percent) |  | 67.80% | 0.00% | 25.80% | 0.00%
Income tax expense, discontinued operations |  | $ 300 |  | $ 1,200 |
Income tax expense, gain on disposal of the Core business | $ 15,469 | 13,200 |  | 15,500 |
Tax credit carryforward, valuation allowance |  | 7,800 |  | 7,800 |
Domestic Tax Authority |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 24,700 |  | 24,700 |
State and Local Jurisdiction |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Operating loss carryforwards |  | 21,200 |  | 21,200 |
Research and Development Tax Credit Carryforward |  |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |  |
Tax credit carryforward, amount |  | $ 1,300 |  | $ 1,300 |

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