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INCOME TAXES - Income tax provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016
Current: |  |
Federal | $ 0 | $ 0
State | 0 | 0
Total current income tax | 0 | 0
Deferred: |  |
Federal | 1,278 | (1,383)
State | (686) | (505)
(Decrease) increase in valuation allowance | (742) | 2,518
Total deferred income tax | (150) | 630
Total income tax provision, amount | $ (150) | $ 630

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