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INCOME TAXES - Income tax provision (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Current: |  |
Federal | $ 0 | $ 0
State | 0 | 0
Total current tax | 0 | 0
Deferred: |  |
Federal | (587) | 1,278
State | (651) | (686)
Increase (decrease) in valuation allowance | 1,714 | (742)
Total deferred tax | 476 | (150)
Total income tax provision, amount | $ 476 | $ (150)

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